CN2368020Y - Infrared temp. measuring apparatus - Google Patents
Infrared temp. measuring apparatus Download PDFInfo
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- CN2368020Y CN2368020Y CN 98241592 CN98241592U CN2368020Y CN 2368020 Y CN2368020 Y CN 2368020Y CN 98241592 CN98241592 CN 98241592 CN 98241592 U CN98241592 U CN 98241592U CN 2368020 Y CN2368020 Y CN 2368020Y
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- infrared temperature
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Abstract
The utility model relates to an infrared temperature measuring device which uses a double sensing unit which comprises a thermopile and is integrated with an ambient temperature sensor to measure the thermal radiating temperature of substances or human bodies. The sensing unit is arranged at the back end of an optical guide pipe, and is wrapped by a metal shade cover, and the outer layer of the sensing unit is isolated by an outer housing to effectively conduct wave, isolate thermal source noise and improve the signal to noise ratio. After the sensed signals are amplified, and noise is filtered, the signals are calculated and processed by a microcomputer chip which at least comprises an analog/digital converter, a central processing unit, a storage unit, a liquid crystal display, a drive circuit, etc., and the temperature is effectively measured. In addition, the utility model also comprises an EEPROM storage system correcting parameter and a system state to simplify a production process. The utility model improves the measurement precision, enlarges the temperature measuring range, and simultaneously stores measuring data.
Description
The utility model is about a kind of infrared temperature measurement mechanism, and particularly a kind of employing contains two sensing cells of thermoelectric pile (thermopile) and ambient temp sensor one, one microcomputer chip and an EEPROM (E lectrically Erasable Programmable Read OnlyMemory, electricity can be deleted programmable read only memory) come the infrared temperature measurement mechanism of enhanced performance.
Traditional contact tehermometer, for example mercury formula or electronic type thermometer can not satisfy user's demand.So need further to pursue accurately and fast, measure easily, interpretation easily, tool injury and more meet the thermometry and the device of hommization.Utilize the non-contact type temperature measurement devices of measuring infrared radiation heat just having above-mentioned advantage at present.Thereby come into one's own gradually and be developed successively.
General infrared radiation temperature measuring equipment, for example known being seen on the market ear thermometer, the emittance (radiation power) that system utilizes thermal source such as infrared ray sensing human body to emit, the environment temperature value that cooperates the environment temperature sensor to be measured emittance is converted to corresponding measurement temperature again.
The temperature of any material thermal source or human body temperature all can radiate heat radiation (thermalradiation), Yi Wenen law (Wiens law), and its thermal-radiating maximum wavelength is λ
Max=2900/T, wherein λ
MaxUnit is μ m, and T is the absolute temperature ° K of material, so the about 8-10 μ of the wavelength m of the maximum radiated power of human body temperature (about 35-40 ℃).
According to the Stefan-Boltzmann law, the energy of material radiation is E=ε ρ T again
4, wherein ε is the radiance of object, and human body surface is 0.98, and coefficient ρ is 5.67 * 10
8W/m
2(° K)
4So reaching the heat energy of sensor from material or human body surface is q=ε ρ (T
b 4-T
a 4), T wherein
bBe material or human body temperature, T
aEnvironment temperature for sensor.
Learn that by above sensor also can receive the hot temperature energy of measured matter or human body, thereby judge its temperature under the situation that does not touch measured matter or human body.But for obtaining the measurement of high sensitivity and correctness, need good heat guiding structure device to be measured and thermonoise spacer assembly, stable signal amplifies and noise filtering, and suitable system controlled by computer and signal Processing design.And more want be manufacture, alignment technique, generation QC and reclaim check and can cooperatively interact, production capacity can be improved.
As known to, radiant heat sensor has several, comprises thermoelectric pickup (pyoelectric) and thermoelectric pile etc.So the sensor difference of using, or different to the measuring system precision with the demand of measuring temperature range, the design of entire system all must have suitable cooperation.
Therefore, one of the purpose of this utility model is: adopt and to contain the integrated dual sensor of thermoelectric pile and ambient temp sensor as radiant heat sensor, so that a kind of novel infrared temperature measurement mechanism to be provided.
Another purpose of the present utility model is: a microcomputer chip that is applied to a temperature measuring equipment is provided, carries out the calculation process of signal, and cooperate an EEPROM to carry out the storage etc. of system compensation and survey data, to simplify production routine and to improve systemic-function.
According to the purpose of above-mentioned the utility model, a kind of infrared temperature measurement mechanism is provided, comprise at least:
One integrated two sensing cells comprise a thermoelectric pile and an ambient temp sensor is formed, in order to the sensing emittance, to send a corresponding signal;
One metal cover and a shell coating the guided wave element that two sensing cells have, and therebetween form the clearance, to provide guided wave element a pair of insulation effect;
One signal amplifilter, the signal that will import into amplify with noise filtering to be handled;
One microcomputer chip in order to this signal after the processing of received signal amplifilter, is handled the measurement temperature output that produces a correspondence as calculated;
One electricity can be deleted programmable storage, by microcomputer chip control, in order to store required system and correction parameter; And
This output result that one output unit, shows signal processing unit produce.
For other purposes, feature and the advantage stated on the utility model can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings:
Fig. 1 represents the structural representation of integrated two sensing cells that the utility model infrared temperature measurement mechanism is used;
Fig. 2 represents the structure cutaway view of measuring sonde (probe) in the utility model infrared temperature measurement mechanism;
Fig. 3 represents the system block diagram of an embodiment in the utility model infrared temperature measurement mechanism;
Fig. 4 represents the detailed circuit diagram of corresponding diagram 3 middle infrared (Mid-IR) temperature measuring equipments;
Fig. 5 represents the LCDs that the utility model infrared temperature measurement mechanism has;
Fig. 6 represents the process flow diagram that the utility model is proofreaied and correct with a microcomputer chip disposal system;
Fig. 7 represents that the utility model makes the outfit figure of system compensation with manual input; And
Fig. 8 represents that the utility model makes the outfit figure of system compensation with automatic input.
See also Fig. 1, the synoptic diagram of the dual sensor that it is adopted for the utility model device.As shown in the figure, two sensing cells 1 comprise a thermoelectric pile 13 and an ambient temp sensor 12, are to be arranged on the base 10, coat with a valve jacket 15, and 10 of bases have the pin 11 of four outputs.The making of thermoelectric pile 13 and ambient temp sensor 12, be that deposition forms on a silicon chip 131, with the cold junction (cold junction) of silicon chip 131, hot junction (hot junction) 132 and cold junction 131 are kept apart by etching as thin as a wafer an isolated film as thermoelectric pile 13.Heat radiation energy (radiation power) will import into via the filter window 14 that has on the valve jacket 14, after receiving, the absorption region of hot junction 132 converts heat to, therefore, 131 of hot joint 132 and cold junctions will form the temperature difference, again by for example connecting the tiny thermopair of a pile (thermocouple) (not illustrating) at cold junction 131 and 132 of hot junctions, according to seat Bake effect (Seebeck-Effect), just can measure the voltage signal that thermoelectric pile 13 produces, it will be proportional to the temperature difference of 132 of cold junction 131 and hot junctions.
What must be illustrated is again, the utility model employing is formed on ambient temp sensor 12 and thermoelectric pile 13 the integrated design of one, it is the temperature of wanting to utilize ambient temp sensor 12 measurement environment, and provide benchmark immediately as cold junction 131 temperature, so can improve when the known temperature sensor is discrete to be provided with the reference temperature measuring error that is produced and be subjected to unnecessary problems such as interference.Therefore, the utility model will have the benefit of high sensitivity and high-accuracy with the measurement of two-in-one two sensing cells 1 as temperature.
Referring again to accompanying drawing 2, it is the structure cut-open view of the temperature measurement probe of the utility model device.As shown in the figure, measuring sonde 99 includes a shell 90, generally is plastic products, coats inner all sensing components by shell 90.Above-mentioned two sensing cells 1 are fixed on the end of a waveguide pipe 92 by a holder 91, make waveguide pipe 92 be able to prop up the filter window 14 of two sensing cells 1, and holder 91 is preferably with metal to be made, to reduce the temperature difference of waveguide pipe 92 and 1 formation of two sensing cell.Waveguide pipe 92 is preferably with metal to be made, and the outside plated with gold that needs, to increase its reflectivity to radiation.The sensing component of above-mentioned whole inside is put and is lain in the cone shape metal cover 94, fixes waveguide pipe 92 with a dottle pin 93.Therefore, the utility model device is when transmitting measured heat radiation energy, combine the isolation effect of shell 90 respectively, block electronics and thermal source noise with shade 94, and waveguide pipe 92 reliable insulating capacities, the external guidance end that removes non-radiative energy and be by waveguide pipe 92 imports into, and promptly waveguide pipe 92 is away from an end that engages with two sensors 1, and the possible heat radiation in any position is imported into all and will be completely cut off to fall.Therefore, the material that measure or human body temperature as long as be placed on the end of waveguide pipe 92 away from two sensing cells 1, just can effectively be passed on the thermoelectric pile 13 of its emittance to two sensing cells 1.In addition, between holder 91 and the shade 94, between shade and the waveguide pipe 92 and more be formed with clearance 98 between shade 94 and the shell 91, so can reach dual effect of heat insulation, just can increase the signal to noise ratio (S/N ratio) (signal-noise-ratio) of interelement heat insulation and lifting measuring sonde 99.As for, on the end (being the position that waveguide pipe 92 heat radiations are imported into) of shade 94, can fix a filter 95, in order to avoid waveguide pipe 92 to be damaged and to pollute, or having more a removable cover 96 covers, so also can guarantee the cleaning when the utility model device is measured the ear temperature as ear thermometer, filter 95 and cover 96 are preferably with tygon or acrylic plastering to be made.At last, by two sensing cells 1, the radiation energy that waveguide pipe 92 is transmitted by the temperature contrast of 132 of its cold junction 131 and hot junctions, forms a signal and is transferred on the printed circuit board (PCB) (PCB) 120 through its pin 11 and handles.
See also accompanying drawing 3, it is the signal Processing block scheme of the utility model device.As shown in the figure, the signal by integrated two sensing cells 1 produce after the processing via an amplification and wave filter 2, is imported into a microcomputer chip 3.This microcomputer chip 3 is combined with an analog/digital coverter 31, and the analog signal conversion that will import into becomes digital signal; One contains the central processing unit (MPU) 32 of ROM (read-only memory) (ROM) and random access memory (RAM), handling the digital signal of input, and produces thermometric result by the control of some keyboards 5; One LCD driver 33 is with control LCDs (LCD) 6 displays temperature values; And a communication interface 34, in order to the device 8 of outside, for example one proofread and correct the instrument of usefulness or the instrument of a monitoring carries out the input and the output of data.This microcomputer chip 3 is a pattern of making a single-chip, the calculated signals that can be reached by input by MPU32 in the lump goes out temperature value measured, read parameter with writing system by an EEPROM 4, and voice output to a hummer or loudspeaker 7 can be provided, and with the communication of external device (ED) 8.
Referring again to accompanying drawing 4, it is the detailed circuit diagram of Fig. 3.The signal of two sensing cells 1, promptly the signal that is produced by thermoelectric pile 13 and environment temperature sensor 12 after handling via amplifying circuit 21,22 respectively, is admitted in the middle of the microcomputer chip 3.Two buttons 51,52 are used for starting the order that corresponding respectively " opening " now " selection " reaches " execution ", for instance, reach in the orders such as " by taking out temperature value in the storer " selection and carry out it by " detecting ear temperature ", " detecting other material temperature ", " storing temperature ".When two buttons 51,52 are pressed simultaneously, can be used as setting to " date ", " time " or " showing " with Celsius or Fahrenheit, further select and carry out to start.LCD6 will demonstrate the content in when operation, and when any action that touches the button is not arranged after a special time, display screen will enter a rest holding state or a closed condition.Systematic parameter, for example measurement update factor and system condition are to read and write among the EEPROM 4 by microcomputer chip 3.Voice output can show the situation of some systems, and for example when the infrared ray temperature device prepare to be measured, or measurement result all can be pointed out by loudspeaker 7 when occurring.The communication interface of microcomputer chip 3 is connected with external device (ED) 8 with a winding displacement joint 34.One power supply circuit 100 is with V in the diagram
nBe power end, different voltage V can be provided
1, V
2, V
3, and V
a, the control signal C that sends by microcomputer chip 3
t, with oxide-semiconductor control transistors Q
1Carry out the operation of opening or closing whole device.
Accompanying drawing 5 is the shown content of LCDs.The LCD6 content displayed comprises date and time 65, function demonstration 61,62,63 and 64, temperature value 66, Celsius or the state 68 of Fahrenheit 67, measurement or non-measurement and the caution 69 of power shortage etc.
Accompanying drawing 6 is made the process flow diagram proofreaied and correct for making during the utility model device with microcomputer chip.Comprise the following step:
(a) read a magnitude of voltage, to set the critical demonstration under " power shortage " situation;
(b) read at least two group resistance and corresponding Temperature Datum, to produce a response line of temperature sensor;
(c) check the real reaction of temperature sensor, if need the response line of the temperature sensor of then resetting;
(d) read at least two group voltages and corresponding Temperature Datum, to produce a response line of thermoelectric pile; And
(e) check the real reaction of thermoelectric pile, if need the response line of the thermoelectric pile of then resetting.
The program of proofreading and correct can be described below manually or automated manner finish.
Please refer to accompanying drawing 7, it is for finishing the equipment of the utility model device correction with manual mode.As shown in the figure, temperature measuring equipment comprises the printing board PCB 120 that a measuring sonde 99 and has microcomputer chip 3, EEPROM4, button 5, LCD6 and interface 34.Device is attached to a stationary installation 81 by interface 34, it comprises the input of a plurality of buttons 810 as the data of correction, at least two blackbody radiation sources 82 with different reference temperatures, to aim at the measuring sonde 99 of the utility model device, detect the temperature of benchmark respectively, wherein each blackbody radiation source 82 is made FEEDBACK CONTROL, a controller 825 and a control panel by a thermal control metallic object 821, a well heater 822, hygrosensor 824 and display screen 826 is formed.Under the control program of microcomputer chip 3, the user will monitor the result that two sensing cells 1 are reacted in the measuring sonde 99 by LCD6, yet by button 810 and button 5 input correction data, to proofread and correct shown reaction result.Afterwards, corrected parameter will deposit in the EEPROM 4 with the described correcting process of above-mentioned Fig. 6 under microcomputer chip 3 controls.
At last, please refer to accompanying drawing 8, it is for finishing the equipment of the utility model device correction with automated manner.Same Fig. 7 uses stationary installation 81 and blackbody radiation source 82, but more comprises signal receipts/the device 813,828 and a coder/decoder 814,827 of mutual correspondence.First receives/send out device can comprise the photodiode that do not illustrate and the receiver communication link as optical sensor, otherwise also can use wireless mode of connection.Under automatic correction program, receive/send out device 813 by microcomputer chip 3 control signals, via coder/decoder 814 and blackbody radiation source 82 communications, revise continuously and automatically with doing with the detecting temperature.The button 810 of stationary installation 81 is only as the usefulness that starts and cancel correction program.A signal receipts/device 813 and coder/decoder 814 also can be incorporated in the topological design of the utility model printing board PCB 120, so just need not proofread and correct with stationary installation 81.
Because the process of proofreading and correct system cooperates EEPROM 4 to finish by microcomputer chip 3, the program of correction and data can be suitable is arranged to reach one than high-accuracy and in a big way or the measurement of certain limit.For instance, utilize a plurality of temperature corrections around the human body to name a person for a particular job to guarantee the correctness of the temperature that measures, the correction position that has some to be higher or lower than temperature range, temperature measuring equipment of the present utility model can operate in other temperature range too, for example in 0 ℃-100 ℃ scope.
Though the utility model discloses as above with a preferred embodiment; right its is not in order to limit the utility model; anyly have the knack of this skill person; change of being permitted and the retouching on basis of the present utility model, done; therefore all do not break away from spirit and scope of the present utility model, protection domain of the present utility model is as the criterion when the protection domain that claims limited that look the application.
Claims (16)
1, a kind of infrared temperature measurement mechanism is characterized in that, comprises at least:
One integrated two sensing cells are made up of a thermoelectric pile and an ambient temp sensor;
One metal cover and a shell coat the guided wave element that this pair sensing cell has, and therebetween form the clearance;
One signal processing unit is connected with the signal output part of this pair sensing cell;
One storage unit is connected in this signal processing unit; And
One output unit is connected in the output terminal of this signal processing unit.
2, infrared temperature measurement mechanism as claimed in claim 1 is characterized in that said thermoelectric pile and said ambient temp sensor are formed on the silicon chip in the said pair of sensing cell.
3, infrared temperature measurement mechanism as claimed in claim 1, it is characterized in that said signal processing unit, also comprise an amplifilter and a microcomputer chip, the input end of said amplifilter is connected with the output terminal of this pair sensing cell, and the output terminal of said amplifilter is connected with said microcomputer chip.
4, infrared temperature measurement mechanism as claimed in claim 3 is characterized in that said microcomputer chip also comprises an analog/digital converter, a central processing unit, a storer, a display controller and a communication interface.
5, infrared temperature measurement mechanism as claimed in claim 1 is characterized in that said storage unit is an electric erasable programmable memory device (EEPROM).
6, a kind of infrared temperature measurement mechanism is characterized in that, comprises at least:
One temperature sensing unit;
One metal cover and a shell coat the guided wave element that said temperature sensing unit has, and therebetween form the clearance;
One signal amplifilter is connected with the output terminal of said temperature sensing unit;
One microcomputer chip is connected in the output terminal of said signal amplifilter;
One electric erasable programmable memory device (EEPROM) is connected with said microcomputer chip; And
One output unit is connected with the output terminal of said signal processing unit.
7, infrared temperature measurement mechanism as claimed in claim 6 is characterized in that said temperature sensing unit is integrated and form by a thermoelectric pile and an ambient temp sensor.
8, infrared temperature measurement mechanism as claimed in claim 7 is characterized in that said thermoelectric pile and said ambient temp sensor are formed on the silicon chip.
9, infrared temperature measurement mechanism as claimed in claim 6 is characterized in that said microcomputer chip also comprises an analog/digital converter, a central processing unit, a storer and a display controller.
10,, it is characterized in that said microcomputer chip has a date and time signal access unit as claim 3 or 6 described infrared temperature measurement mechanisms.
11,, it is characterized in that said microcomputer chip has a voice output unit as claim 3 or 6 described infrared temperature measurement mechanisms.
12, as claim 3 or 9 described infrared temperature measurement mechanisms, it is characterized in that said microcomputer chip also has a communication interface, be connected that said external device (ED) comprises a means for correcting at least with an external device (ED).
13, infrared temperature measurement mechanism as claimed in claim 12 is characterized in that said means for correcting comprises a blackbody radiation source at least.
14,, it is characterized in that said microcomputer chip comprises that also one proofreaies and correct control module as claim 3 or 6 described infrared temperature measurement mechanisms.
15, infrared temperature measurement mechanism as claimed in claim 14 is characterized in that said correction control module has an input stationary installation and is connected to said microcomputer chip; And have two radiation sources at least with different reference temperatures.
16, infrared temperature measurement mechanism as claimed in claim 15 is characterized in that said input stationary installation and said radiation source have data transmission and receiving trap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98241592 CN2368020Y (en) | 1998-10-21 | 1998-10-21 | Infrared temp. measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98241592 CN2368020Y (en) | 1998-10-21 | 1998-10-21 | Infrared temp. measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2368020Y true CN2368020Y (en) | 2000-03-08 |
Family
ID=33988316
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98241592 Expired - Fee Related CN2368020Y (en) | 1998-10-21 | 1998-10-21 | Infrared temp. measuring apparatus |
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| Country | Link |
|---|---|
| CN (1) | CN2368020Y (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310546C (en) * | 2003-05-22 | 2007-04-11 | 华为技术有限公司 | Terminal with temperature measuring function and its realizing method |
| CN1312809C (en) * | 2002-06-25 | 2007-04-25 | 松下电工株式会社 | Infrared sensor package |
| CN100402984C (en) * | 2002-08-17 | 2008-07-16 | Lg电子株式会社 | Infrared sensor part and refrigerator with the infrared sensor |
| CN1917590B (en) * | 2005-05-26 | 2011-08-10 | 弗卢克公司 | Method for fixed pattern noise reduction in infrared imaging cameras |
| CN102538977A (en) * | 2011-12-27 | 2012-07-04 | 郑州炜盛电子科技有限公司 | Miniature pyroelectric infrared sensor |
| CN101702035B (en) * | 2009-02-19 | 2012-10-03 | 黄程云 | Digital quasi-static passive human body detector |
| CN104204748A (en) * | 2012-03-22 | 2014-12-10 | 德克萨斯仪器股份有限公司 | Calibration of Thermal Sensors |
| CN107543614A (en) * | 2016-06-24 | 2018-01-05 | 上海新微技术研发中心有限公司 | Thermopile sensor |
| CN109642826A (en) * | 2016-09-06 | 2019-04-16 | 爱德华兹有限公司 | Infrared temperature sensor for high speed rotating machine |
| CN110160670A (en) * | 2019-05-05 | 2019-08-23 | 深圳中集智能科技有限公司 | Body temperature detection device |
| CN111189548A (en) * | 2020-03-06 | 2020-05-22 | 成都优蕊光电科技有限公司 | Multi-band infrared detector and preparation method of band-pass window |
| CN111707380A (en) * | 2020-07-10 | 2020-09-25 | 浙江荣胜工具有限公司 | A forehead thermometer that displays different colors according to the detected temperature and its control circuit |
| CN115581439A (en) * | 2016-03-23 | 2023-01-10 | 原相科技股份有限公司 | Wearable device |
-
1998
- 1998-10-21 CN CN 98241592 patent/CN2368020Y/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312809C (en) * | 2002-06-25 | 2007-04-25 | 松下电工株式会社 | Infrared sensor package |
| CN100402984C (en) * | 2002-08-17 | 2008-07-16 | Lg电子株式会社 | Infrared sensor part and refrigerator with the infrared sensor |
| CN1310546C (en) * | 2003-05-22 | 2007-04-11 | 华为技术有限公司 | Terminal with temperature measuring function and its realizing method |
| CN1917590B (en) * | 2005-05-26 | 2011-08-10 | 弗卢克公司 | Method for fixed pattern noise reduction in infrared imaging cameras |
| CN101702035B (en) * | 2009-02-19 | 2012-10-03 | 黄程云 | Digital quasi-static passive human body detector |
| CN102538977A (en) * | 2011-12-27 | 2012-07-04 | 郑州炜盛电子科技有限公司 | Miniature pyroelectric infrared sensor |
| CN104204748A (en) * | 2012-03-22 | 2014-12-10 | 德克萨斯仪器股份有限公司 | Calibration of Thermal Sensors |
| CN104204748B (en) * | 2012-03-22 | 2017-03-08 | 德克萨斯仪器股份有限公司 | Calibration of Thermal Sensors |
| CN115581439A (en) * | 2016-03-23 | 2023-01-10 | 原相科技股份有限公司 | Wearable device |
| CN107543614A (en) * | 2016-06-24 | 2018-01-05 | 上海新微技术研发中心有限公司 | Thermopile sensor |
| US10837836B2 (en) | 2016-09-06 | 2020-11-17 | Edwards Limited | Temperature sensor for a high speed rotating machine |
| CN109642826A (en) * | 2016-09-06 | 2019-04-16 | 爱德华兹有限公司 | Infrared temperature sensor for high speed rotating machine |
| CN109642826B (en) * | 2016-09-06 | 2023-08-15 | 爱德华兹有限公司 | Infrared Temperature Sensors for High Speed Rotating Machines |
| CN110160670A (en) * | 2019-05-05 | 2019-08-23 | 深圳中集智能科技有限公司 | Body temperature detection device |
| CN111189548A (en) * | 2020-03-06 | 2020-05-22 | 成都优蕊光电科技有限公司 | Multi-band infrared detector and preparation method of band-pass window |
| CN111707380A (en) * | 2020-07-10 | 2020-09-25 | 浙江荣胜工具有限公司 | A forehead thermometer that displays different colors according to the detected temperature and its control circuit |
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