CN1741652A - Mobile communication device with air detection function - Google Patents

Abstract

The invention relates to a mobile communication device with air detection function, which is used for providing the functions of quickly uploading detection results and quickly moving detection tools. The mobile communication module at least comprises a communication interface for bidirectional data transmission, a microprocessor for interpreting, calculating and processing all data of the mobile communication device, and a memory for storing the data processed by the microprocessor and providing the required data when the microprocessor needs the data. The air detector of the device is connected with the mobile communication module through a connecting interface for gas monitoring and transmitting the measuring result to the mobile communication module through a transmission interface.

Description

Mobile communication device with air detection function

technical field

The invention relates to a mobile communication device, especially a mobile communication device with an air detection function, which can be used as a portable air detector to monitor air quality or toxic gas content and send it to relevant management units immediately.

Background technique

There are countless gas detection methods. Miners in early wars or mines used canaries to detect traces of toxic gases in the air. With the development of science and technology, people no longer use animals to detect toxic gases, and then develop various gas monitoring instruments. Generally known are chemical absorption (chemical absorption), electrochemical sensor (electrochemical sensor), Galvanic Cell (Galvanic Cell) sensor and gas chromatography (gas chromatography), mass spectrometer, etc., according to different needs It was developed to monitor different kinds of gases in different environments.

The following will introduce several common air detectors, semiconductor sensors, infrared sensors, and new carbon nanotube gas detectors.

Semiconductor sensors were first seen in 1964, using zirconia and tin oxide as air sensor materials, low price and long durability, including many flammable gas and carbon monoxide alarm products currently on the market market. As the name suggests, semiconductors are characterized by their electrical conductivity between conductors and insulators. When the gas to be measured passes through the surface of the substrate, the physical properties of the substrate will change due to the adsorption reaction, for example, for semiconductors, the conductivity of the substrate will change. Know the concentration of the monitored gas by monitoring the change of its conductivity characteristics. However, the excessive impact of temperature changes on the monitoring results and the high power consumption limit the development of semiconductor sensors in portable air monitors. With the gradual development of nanotechnology, the manufacturing process of such semiconductor materials has been improving. Compared with some sensing materials such as electrochemical materials that cannot be recycled after use, semiconductor materials that are easy to recycle are used in portable There is still room for growth in air monitors.

Optical gas analyzers based on infrared (infrared) are gradually maturing. The principle of use is to use the absorption characteristics of gases at special wavelengths of infrared rays and the characteristics that the gas concentration is proportional to the absorption within a certain range to achieve quantitative purposes; In addition, if multiple gases are to be detected at the same time, and the infrared absorption characteristics of the detected gases are quite different, optical sensors with different light sources (double-beam or multi-beam) should be used. Infrared sensors are commonly used in the analysis of hydrocarbons. Because they do not need to be in contact with the air to be measured, they are often used for chimney exhaust monitoring, remote gas monitoring, etc. However, the miniaturization of the infrared sensor is not easy, and the price is relatively expensive, making it less common in the portable air monitor market.

In recent years, nanotechnology has been in full swing all over the world, and related applications have also been developed. Ashish Modi of the United States has developed a gas detector using carbon nanotubes. The basic structure of this detector is an array of carbon nanotubes grown on a silicon dioxide substrate. The tip radius of each carbon nanotube is only 15nm, and the distance between them is about 50nm. Aluminum is used as another electrode at 150 μm above the carbon nanotubes. Because the carbon nanotubes are very thin, the electric field strength near them is quite large, and a very low voltage can dissociate the gas molecules and conduct the circuit. After research, it is found that different gas molecules have different breakdown voltages, so the type of gas molecules can be identified by using the size of the breakdown voltage. In addition, there is a good exponential relationship between the magnitude of the current and the gas concentration, so the gas to be measured can be quantified by the magnitude of the current. Since the working voltage required by carbon nanotube gas detectors is quite low, taking a carbon nanotube gas detector with an electrode spacing of 25 μm as an example, only a working voltage of about 130V can dissociate gas molecules. It can already be provided by common batteries, so it is helpful for the development of portable gas detectors.

To sum up, there are many difficulties to be faced in the development of a portable gas monitor. In addition to overcoming the working voltage, there are also restrictions on the types of gases to be detected. Usually, a set of instruments can only detect one or two gases, and a sample However, the overall air quality assessment of the district requires the detection data of multiple gases, so how to quickly detect multiple gases is also one of the problems to be solved. At present, some large-scale far-infrared detection devices have been developed to detect multiple air pollution gases at the same time for a long time, but the high cost and the inconvenient nature of the movement make this type of instrument rarely used in general applications. In addition, gas detection or air monitoring requires multi-point sampling and rapid return update and notification system. The development of a gas detector that is easy to move and can be replaced quickly and a system that can quickly connect data are also currently available. One of the directions of development.

Contents of the invention

The purpose of the present invention is to develop a mobile communication device with air detection function, so that users can conveniently move the air detector to perform multi-point sampling to obtain more accurate detection results.

Another object of the present invention is to develop a mobile communication device with an air detection function, which can directly upload the detected air detection data to a remote database through the mobile communication device.

Another object of the present invention is to develop a mobile communication device connected with an external air detector, wherein the above-mentioned air detector can be easily replaced with different types of gases to be tested.

The invention discloses a mobile communication device with an air detection function, which at least includes: a mobile communication module and an air detector. The mobile communication module can be used for general communication functions and can also be used to upload data to a remote end database or download data from the remote database. The mobile communication module at least includes: a communication interface, capable of transmitting and receiving bidirectional signals with the remote database; a first microprocessor, used to interpret, calculate, and process all data of the mobile communication device; a memory, connected to the microprocessor, used to store the data processed by the microprocessor and provide the required data when the microprocessor needs it; a display interface, coupled to the microprocessor, used to display the mobile communication device Status, received messages and processed data; a dial module, coupled to the microprocessor, responds to the user's dial operation, and sends signals to the microprocessor. The air detector of the device is connected to the mobile communication module through a connection interface for gas monitoring, and the measurement result is transmitted to the mobile communication module through a transmission interface. The air detector includes at least one detection module for gas monitoring; the second microprocessor is coupled to the detection module for interpreting and processing the data measured by the detection module and through the The connection interface transmits the monitoring data to the mobile communication module to be displayed on the display interface.

Description of drawings

The various features and other advantages of the present invention described above can be more clearly understood from the following more detailed descriptions accompanied by accompanying drawings, wherein,

FIG. 1 is a schematic structural diagram of a first embodiment of a mobile communication device disclosed in the present invention;

FIG. 2 is a schematic structural diagram of the second embodiment of the mobile communication device disclosed in the present invention;

FIG. 3 is a structural diagram of a third embodiment of the mobile communication device disclosed in the present invention.

Detailed ways

The invention discloses a mobile communication device with air detection function. The present invention utilizes the replaceability of the external air detector to conveniently and quickly replace different types of air detectors when facing different detection gases; Download the environmental correction factors of different conditions to adjust the air detector to make the monitoring results of the air detector more objective and accurate, and upload the detection results to relevant management units for monitoring comparison and data management after the measurement is completed. The detailed description and related examples of the present invention are as follows.

Please refer to FIG. 1 . FIG. 1 is a structural diagram of a first embodiment of a mobile communication device disclosed in the present invention. The mobile communication device 100 of the present invention includes a mobile communication module 200; and an air detector 300 for gas monitoring. Wherein, the mobile communication module 200 also includes a communication unit 210 to receive the data or signal transmitted by the remote database through the wireless network or the broadcasting system, decode and restore it into data, and then transmit it to a microprocessor 220, in order to interpret and calculate the signal data, the data transmitted by the microprocessor can also be sent out in the form of wireless network or broadcast to form a two-way communication mode. As for the communication protocol used, it can be used ( But not limited to) GSM, CDMA, PHS, or two-way call protocol; the microprocessor 220 is connected to a memory 230, so that the required data, data or application program can be loaded from the memory element 230 when needed. Store the received data and processed data in the memory 230; the user can read all the messages processed by the microprocessor 210 through a display interface 240, and use a dial module 250 to Perform operations such as dialing function and data transmission; in addition, the mobile communication module also includes a transmission interface 260, which is used as the connection end of the air detector 300 to transmit the signal data from the air detector 300 to the microprocessor 220.

The aforementioned mobile communication device 100 also includes a power supply 270 connected to the mobile communication module 200 to provide power required for operation. The power supply 270 may include a DC adapter and a battery module. Wherein, a DC adapter can be used to connect an AC power supply to supply power, or a battery module, such as a lithium battery of a general mobile phone, can be selected to supply power. In addition, the charging circuit and program are built in the microprocessor 320, which can directly charge the lithium battery.

The air detector 300 externally connected to the mobile communication module 200 of the present invention includes at least the following elements: a detection module 310 for monitoring a specific gas; a microprocessor 320 connected to the detection module 310 for The data measured by the detection module 310 is calculated and interpreted, and the measured data is transmitted to the display interface 240 of the mobile communication module 200 through a connection interface 330 to provide the user with a detection result. The measured data is uploaded to the remote database through the mobile communication module 200 for data monitoring and comparison; in addition, the microprocessor 320 has a trigger program built in, when the data interpreted by the microprocessor 320 exceeds the normal When the value is safe, the trigger program will activate an alarm device 340 to warn the user, and transmit the alarm data to the mobile communication module 200 through the connection interface for uploading to a remote database or a supervisory unit. In addition, the air detector 300 also includes a power supply 350 to provide power required for operation.

The mobile communication module 200 described in the present invention is a generally known personal digital assistant tool, such as a mobile phone or a PDA. In addition to being used as a general personal digital communication assistant, when the air detector is connected externally, the data measured from the air detector 300 can be uploaded to different remote databases through the communication unit 210 through the transmission interface 260 . The connected remote databases are various databases, depending on the usage of the air detector 200 . In a preferred embodiment, if the present invention is used for the monitoring of air quality, the remote database may be the gas monitoring database of the environmental protection unit; if the present invention is used for road control of public security maintenance, such as the alcohol concentration of drunk driving monitoring, then the remote database may be criminals and the lost car database of the police department; if the present invention is used in some home early warning systems, such as the monitoring of carbon monoxide concentration, then the remote database may be a community safety alarm network; according to different It is one of the main features of the mobile communication device 100 of the present invention to communicate with different remote databases.

According to a preferred embodiment of the present invention, the mobile communication module 200 of the present invention is externally connected to an air detector 300 for detecting air quality (such as hydrocarbons, carbon dioxide, chlorofluorocarbons, etc.), which can be a semiconductor composed of semiconductors. sensor, infrared detector, or carbon nanotube detector. At present, most of the exhaust gas detection devices on the road use fixed-point detection, that is, fixed-point detectors are set on road sections with high traffic volume; however, an open road space has upwind and downwind places on the same road section , and with different temperatures and wind speeds every day, the exhaust gas has different settling and spreading velocities. Based on the above considerations, the reliability of fixed-point sampling data is much lower than that of multi-point sampling. The mobile communication device 100 of the present invention has the advantages of being convenient to carry and can move quickly to perform multi-point sampling; in addition, the user can detect environmental factors such as temperature, wind speed, and humidity from a remote database (for example, the Environmental Protection Agency). The database of the exhaust gas supervision unit) downloads the correction factor to adjust the external air detector 300, so that the measurement result is more accurate. With the mobile communication device 100 of the present invention being convenient to move, multi-point sampling is performed to calculate the average sampling value of the sample area, so that the accuracy of air monitoring is further improved.

In addition, traditional air quality monitoring often selects an indicator gas, such as hydrogen, as the monitoring standard. But in fact, different pollution sources will cause different components of exhaust gas, and the fixed index gas types for detection will also cause a gap in the evaluation results. If the mobile communication device 100 of the present invention is used, the convenient replaceability of the external air detector 300 can be utilized, and different types of air detectors 300 can be used to detect various gases to obtain local exhaust gas composition data, which can be compared Regionally representative sampling data. The air monitoring data obtained by the air detector 300 can be uploaded to the relevant exhaust gas management unit through the communication unit 210 for filing and comparison, and then necessary management measures can be taken for the highly polluted sample area.

Please refer to FIG. 2 , which is a structural diagram of a second embodiment of the mobile communication device disclosed in the present invention. The mobile communication device 400 disclosed in the present invention includes a mobile communication module 500 and an air detector 600 . Wherein, the mobile communication module 500 includes a communication unit 510, similar to the first embodiment, this communication unit 510 can perform two-way transmission of data through a wireless network or a broadcasting system, except for uploading data to a remote database , can also download various update programs from the remote database to perform program update on the microprocessor 520; In addition to the data, it can also process and calculate the data and data detected by the air detector transmitted through a transmission interface 550; the microprocessor 520 is connected to a memory 530 to transmit the processed data to the memory 530 for storage, And when needed, read the required data and application programs from the memory 530; the operator can know the operating status of the mobile communication device through a display interface 540, and through a dial module 550, dial and operation of various functions.

The air detector 600 externally connected to the mobile communication module 500 of the present invention includes a detection module 610 for monitoring a specific type of air; and a connection interface 620 for connecting the transmission interface of the mobile communication module 500 560, to transmit the data measured by the detection module 610 to the microprocessor 520 for interpretation and calculation.

The mobile communication device 400 of the present invention further includes a power supply 570 connected to the mobile communication module to provide the power required for the operation of the mobile communication device 400 . Similar to the above-mentioned first embodiment, the power supply 570 may include a DC adapter and its battery module. Wherein, the activation of the air detector 600 is controlled by the power supply 570 on the mobile communication module 500 . The external air detector 600 of the mobile communication device 400 disclosed in the present invention can be replaced with different types of detection instruments according to different occasions. The external air detector is one of the replaceable accessories of the mobile communication device 400 . Different types of air detectors 600 are replaced according to different needs, and the communication unit 510 is used to download the update programs of various detectors and detection environments, so as to achieve the purpose of rapid update of portable products and more objective and accurate measurement.

In a preferred embodiment, the mobile communication device 400 of the present invention is externally connected to an air detector 600 for detecting alcohol, so as to be applied in security applications. An air detector for detecting alcohol may use an electrochemical sensor, a semiconductor sensor, or a carbon nanotube detector. The police officers performing their duties can use the mobile communication device 400 of the present invention to carry out alcohol detection to the stopped vehicle, and directly utilize the dial module 550 of the mobile communication module 500 to input the license plate number and the identity number of the examinee. The data will be uploaded to the relevant police database through the communication unit 510 for searching to see if there is any criminal file. Once the alcohol concentration exceeds the standard range, the police officer can view the data of the subject that has just been uploaded and returned through the display interface 130, and directly use the dial module 550 to perform illegal login operations, so as to achieve timely upload and easy operation the goal of. In addition, if there is a problem with the license plate number or the data of the examinee, the remote police database can also be displayed on the display interface 540 through the communication unit 510 of the present invention in time to notify the relevant police officers, which can detect crimes in time and the purpose of saving police force.

Please refer to FIG. 3 . FIG. 3 is a structural diagram of a third embodiment of the mobile communication device disclosed in the present invention. The mobile communication device 700 includes an air detection module 810 , a microprocessor 820 , a memory 830 , a communication unit 840 , an alarm device 850 , a display interface 860 and a dial module 870 . Among them, the microprocessor 820, in addition to calculating and interpreting various data, is also connected to the air detection module 810 for processing and calculating the data sent by the air detection module 810 for gas monitoring. The memory 830 is connected to the microprocessor 820 for storing various data, data or programs from the microprocessor 820 and providing various data to the microprocessor 820 when needed. The communication unit 840 is connected to the microprocessor 820 to upload various data from the microprocessor 820 to the remote database through the wireless network or the broadcast system, or receive various data from the remote database to form a two-way Communication mode, the communication protocol used can be GSM, CDMA, PHS, or two-way call communication protocol. The alarm device 850 is connected to the microprocessor 820. When the data detected by the air detection module exceeds the originally set safety value, the microprocessor 820 will alert the user through the alarm device 850. In addition, similar to the above two embodiments, the user can know all the operating states of the mobile communication device through the display interface 860 and use the dialing module 870 to perform all operations.

Similar to the above two embodiments, the mobile communication device 700 of the present invention includes a power supply 880 on the mobile communication module 800 to provide power required for operation. The power supply 880 may include a DC adapter and a battery module. Wherein, a DC adapter can be used to connect to an AC power supply to supply power, or a battery module, such as a lithium battery used in a general mobile phone, can be used to supply power. In addition, the charging circuit and program are built in the microprocessor 820, which can directly charge the lithium battery.

Not all air detection modules can achieve quantitative purposes for the detected gases. Some air detectors are sensitive to the concentration of certain gases. Although they cannot be quantified, when the measured gas concentration is higher than the air detection module When the tolerance range of the group 810 is reached, the alarm device 850 will be triggered to remind the operator through the display interface 860 . In a preferred embodiment, the mobile communication device of the present invention is applied to indoor carbon monoxide concentration sensing. It is common to see social news that families are poisoned due to excessive indoor carbon monoxide concentration, which is often caused by closed doors and windows in colder weather. Odorless and colorless carbon monoxide gas can make people unconscious gradually. The mobile communication device 700 of the present invention can be conveniently used for this purpose. As long as the air detection module 810 is activated, the carbon monoxide concentration can be monitored constantly. When the indoor carbon monoxide concentration exceeds the preset safety value, the microprocessor 820 will notify the alarm device 850 to send an alarm to remind the people in the room. When the alarm device 850 sends out an alarm for more than a period of time (according to the user's setting), no one presses the stop button If the key is pressed, the microprocessor 820 will directly dial out the telephone number preset in the memory 830 (according to the user's setting, it can be a community safety alarm network or a fire safety unit) to the remote end through the dial module 870 Notify the relevant units to achieve the purpose of home prevention and warning.

In addition, the mobile communication device 700 of the present invention can also be applied to a fire scene. When the firefighters on duty enter the scene of a fire, they often carry a communicator to call each other with their companions and with the control personnel outside the fire scene; The purpose of calling each other among companions is to quickly judge whether the concentration of carbon monoxide that is fatal at the scene is dangerous, so as to notify the control personnel outside and remind oneself to avoid inhaling excessive concentrations of carbon monoxide due to unknowingly high concentrations of carbon monoxide during the rescue process Carbon monoxide hazard or explosion on site causing further casualties.

Based on the above, the mobile communication device of the present invention has the following advantages:

(1) The mobile communication device connected with an external air detector of the present invention has a connection interface, and different types of air detectors can be replaced at any time for different gases to be measured.

(2) The mobile communication device externally connected to the air detector of the present invention achieves the purpose of fast multi-point detection and two-way data transmission.

(3) The mobile communication device externally connected to the air detector of the present invention achieves the purpose of data integration with different databases through the communication interface.

(4) The mobile communication device connected with an external air detector of the present invention can play the role of home warning notification and air quality management.

The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention; all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be regarded as the present invention. scope of protection for inventions.

Claims (31)

1. A mobile communication device with an external air detector, in order to provide the advantages of fast uploading of detection results and rapid movement of detection tools, the mobile communication device at least includes: A mobile communication module, in addition to being used for general communication functions, can also be used to upload data to a remote database or download data from the remote database. The mobile communication module at least includes: A communication interface, capable of transmitting and receiving two-way signals with the remote database; a microprocessor coupled to the communication interface for reading, calculating and processing all data of the mobile communication device; memory, connected to the microprocessor, for storing data processed by the microprocessor and providing required data when required by the microprocessor; An air detector is connected to the mobile communication module for gas monitoring, and the measurement result is sent to the mobile communication module. 2. The mobile communication device according to claim 1, further comprising a display interface, coupled to the microprocessor, for displaying the status of the mobile communication device, received messages and processed data. 3. The mobile communication device according to claim 1, wherein the mobile communication module further comprises a dialing module for operating the mobile communication device. 4. The mobile communication device according to claim 1, wherein the air detector comprises at least: Detection module for gas monitoring; The second microprocessor, coupled to the detection module, receives data from the detection module and performs interpretation and processing; The alarm device is coupled to the second microprocessor. When the gas monitoring result exceeds a safe value, the microprocessor will activate the alarm device through a trigger program to prompt the user. 5. The mobile communication device as claimed in claim 1, wherein the air detector is a semiconductor air sensor. 6. The mobile communication device as claimed in claim 1, wherein the air detector is an infrared gas sensor. 7. The mobile communication device as claimed in claim 1, wherein the air detector is a carbon nanotube gas detector. 8. The mobile communication device as claimed in claim 1, wherein the air detector is an electrochemical gas sensor. 9. The mobile communication device according to claim 1, wherein the communication interface transmits data through a wireless network or a broadcasting system. 10. The mobile communication device according to claim 9, wherein the communication protocol used by the communication interface includes GSM, CDMA, PHS or two-way call communication protocol. 11. The mobile communication device according to claim 1, wherein the data downloaded by the communication interface includes correction data adapted to environmental factors, and the correction data is selected from the correction of environmental factors in the group consisting of humidity and temperature data. 12. The mobile communication device as claimed in claim 11, wherein when it is applied to air quality monitoring, the data downloaded by the communication interface is the data of the group consisting of wind direction, wind speed, temperature and humidity of the location where the measurement is made. environmental factors, and download updated calibration parameters from the remote database. 13. A mobile communication device with an external air detector, the mobile communication device at least comprising: A mobile communication module, in addition to being used for general communication functions, can also be used to upload data to a remote database or download data from the remote database. The mobile communication module at least includes: A communication interface, capable of transmitting and receiving two-way signals with the remote database; a microprocessor coupled to the communication interface for reading, calculating, and processing all data of the mobile communication device; A memory, connected to the microprocessor, is used to store the data processed by the microprocessor and provide the required data when the microprocessor needs it; a display interface, coupled to the microprocessor, for displaying the status of the mobile communication device, received messages and processed data; A dialing module, coupled to the microprocessor, responds to the user's dialing operation, and sends a signal to the microprocessor; An air detector is connected to the mobile communication module for gas monitoring, and the measurement result is sent to the microprocessor of the mobile communication module for data processing. 14. The mobile communication device according to claim 13, wherein the mobile communication module further comprises an alarm device coupled to the microprocessor, and when the monitoring data exceeds a safe value, the microprocessor will The alarm device is activated to warn the user. 15. The mobile communication device as claimed in claim 13, wherein the air detector is a semiconductor air sensor. 16. The mobile communication device as claimed in claim 13, wherein the air detector is an infrared gas sensor. 17. The mobile communication device as claimed in claim 13, wherein the air detector is a carbon nanotube gas detector. 18. The mobile communication device as claimed in claim 13, wherein the air detector is an electrochemical gas sensor. 19. The mobile communication device according to claim 13, wherein the communication interface transmits data through a wireless network or a broadcasting system. 20. The mobile communication device according to claim 13, wherein the communication protocol used by the communication interface includes GSM, CDMA, PHS or two-way call communication protocol. 21. The mobile communication device according to claim 13, wherein the data downloaded by the communication interface is correction data adapted to environmental factors, and the correction data is selected from the correction of environmental factors of the group consisting of humidity and temperature data. 22. The mobile communication device according to claim 13, wherein the air detector is a replaceable part of the mobile communication module. 23. A mobile communication device with an air detection function, the mobile communication device at least comprising: A communication interface that provides two-way signal transmission and reception with the remote database; a microprocessor coupled to the communication interface for reading, calculating, and processing all data of the mobile communication device; A memory, connected to the microprocessor, is used to store the data processed by the microprocessor and provide the required data when the microprocessor needs it; a display interface, coupled to the microprocessor, for displaying the status of the mobile communication device, received messages and processed data; A dialing module, coupled to the microprocessor, responds to the user's dialing operation, and sends a signal to the microprocessor; An air detection module is connected to the microprocessor for gas monitoring, and the measurement result is sent to the microprocessor for data processing. 24. The mobile communication device according to claim 23, further comprising an alarm device connected to the microprocessor, and when the monitoring data exceeds a safe value, the microprocessor will activate the alarm device to alert the user. 25. The mobile communication device as claimed in claim 23, wherein the air detector is a semiconductor air sensor. 26. The mobile communication device as claimed in claim 23, wherein the air detector is an infrared gas sensor. 27. The mobile communication device as claimed in claim 23, wherein the air detector is a carbon nanotube gas detector. 28. The mobile communication device as claimed in claim 23, wherein the air detector is an electrochemical gas sensor. 29. The mobile communication device as claimed in claim 23, wherein the communication interface transmits data through a wireless network or a broadcasting system. 30. The mobile communication device according to claim 23, wherein the communication protocol used by the communication interface includes GSM, CDMA, PHS or two-way call communication protocol. 31. The mobile communication device according to claim 23, wherein the data downloaded by the communication interface is correction data adapted to environmental factors, and the correction data is selected from the environmental factors of the group consisting of humidity and temperature Calibration data.

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