CN104111103A - Handheld intelligent laser measuring device for underground water levels - Google Patents

Abstract

The invention relates to a hand-held intelligent groundwater level laser measuring device. The device is controlled by an ARM single-chip microcomputer, and a laser emitting and receiving unit is composed of a laser transmitter, a laser signal controller, and a laser signal receiver; a signal filter, a signal amplifier , arithmetic unit and GPS positioning module constitute the signal processing unit; the achievement transmitter composed of storage and display, SMS transmitting module and bluetooth constitutes the achievement output unit; it is connected with the computer through the achievement transmitter or interface; After being reflected by the well water surface, it enters signal processing. After being filtered and amplified, the electrical signal enters the calculator for calculation and positioning by the GPS positioning module; the calculated results are imported into the result output unit through the data transmission line; Remotely manage the mobile phone and PC, and complete the water level measurement.

Description

Handheld Intelligent Groundwater Level Laser Measuring Device

technical field

The invention belongs to the technical field of groundwater level laser measurement devices, in particular to a hand-held intelligent groundwater level laser measurement device used in water level measurement of observation wells and pumping wells in departments such as water conservancy, land, mines, environmental protection, municipal administration, and earthquakes. .

Background technique

Water level measurement can be divided into various forms such as float type, ultrasonic type, laser type, pressure type and induction type according to the measurement method. Ultrasonic liquid level gauges and laser liquid level gauges have high measurement accuracy and good reliability, and belong to the category of light wave measurement technology. Due to the wave itself, the ultrasonic water level gauge has a large error for a distance of tens of meters to hundreds of meters, so its measurement range is small. Laser water level gauges are divided into phase method, difference frequency phase method, and pulse method; the so-called phase method is to modulate the light intensity of the emitted light wave with a modulation signal, and measure the phase difference between the modulated light wave and the measured distance, indirectly Find the distance to be measured. The difference frequency phase method is to mix the local oscillator signal with the modulation signal to obtain the difference frequency low-frequency signal, and then perform phase detection on the difference frequency signal, which has improved accuracy compared with the phase method. This difference frequency phase method requires that there are targets that can actively cooperate at both ends of the measured distance. The pulsed laser water level measuring instrument calculates the distance by measuring the time between the launch and return of the laser. At present, the phase method is mostly used for laser distance measurement. This method has certain requirements for the reflective target, that is, a mirror or other reflection device must be required, and the process is complicated. This kind of laser liquid level measurement generally adopts the phase method. The precise short-range photoelectric ranging system basically uses the difference frequency phase method for ranging.

Contents of the invention

The present invention thinks that water is a relatively complicated medium. After the laser is irradiated on the water surface, there will always be a part (according to the relevant information, the reflectance in pure water is 2.2%, and the reflectance in groundwater is higher) to form reflections. In this way, it can be received by the distance measuring device, and the distance measuring device simultaneously records the time for the laser to go back and forth. Half of the product of the speed of light and the round-trip time is the distance between the distance measuring device and the object to be measured; pulsed laser water level measurement, because the speed of light is too fast, is about 3×10 ⁸ m/s, in order to achieve a resolution of 1mm That is, 0.001m, the transmission time measurement circuit must be able to distinguish the following extremely short time: 0.001m/(3×10 ⁸ m/s)=3ps, if it is necessary to distinguish the time of 3ps, the cost of circuit implementation is too high. Using laser echo analysis, using the average law statistical algorithm can simply achieve millimeter-level resolution, the farthest detection distance can reach 200m, and the response speed can be guaranteed. The filtering, collection, conversion and amplification of weak photoelectric signals can be realized through low-temperature drift amplifiers at this stage, and the amplification factor meets the requirements. High reliability, high precision, long distance, multi-function, and low power consumption have always been important indicators for measuring the performance of a rangefinder; aiming at the above, the present invention aims to provide a fast, efficient, and convenient groundwater level measuring device. The invention adopts laser echo analysis and the statistical algorithm of average law to realize millimeter-level resolution, the farthest detection depth can reach 200m, and the response speed can be guaranteed. The ARM single-chip microcomputer greatly improves the function, precision and quality of the present invention, and the circuit is simple, the failure rate is low, and the reliability is high.

The scheme of the present invention is such that the hand-held intelligent groundwater level laser measuring device is controlled by an ARM single-chip microcomputer, and includes three units of laser emission and reception, signal processing, and result output. The laser transmitting and receiving unit is composed of laser transmitter, laser signal controller and laser signal receiver; the signal processing unit is composed of signal filter, signal amplifier, arithmetic unit and GPS positioning module; the storage and display, achievement transmitter (short message Transmitting module, bluetooth) form the achievement output unit, which is connected with the computer through the transmitter or the interface. After the laser transmitter and the laser signal controller emit the laser pulse, after being reflected by the water surface of the observation well, the reflected part of the laser light returns to the laser signal receiver and enters the signal processing unit. After the signal receiver converts the laser signal into the corresponding electrical signal, it is transmitted to the signal filter, and the instrument amplification technology is used to realize the algorithm based on digital correlation with the ARM single-chip microcomputer, improve the signal-to-noise ratio, and effectively restore the weak signal submerged in the strong background noise , the extremely weak laser reflection signal is processed by the filter converter, and the electrical signal passes through the signal amplifier. The instrument amplification technology can detect and collect weak photoelectric signals, and has the advantages of small size, low power consumption, low temperature drift, and high anti-interference , Strong signal-to-noise ratio, large multiple op amp characteristics. It is mainly to remove common-mode interference, amplify useful signals, complete the pick-up of weak signals reflected from the water surface, and meet the level requirements of ARM microcontrollers. After that, the electrical signal enters the data calculator for calculation and GPS positioning. The calculated result is imported into the result output unit through the data transmission line. The calculation results include measurement time, latitude and longitude altitude, water level, etc., and the results are output in three ways. It is stored and displayed on the machine immediately; through the achievement transmitter composed of the SMS transmitting module and Bluetooth, the water level measurement is completed through the SMS transmitting module and Bluetooth synchronously transmitting to the remote management mobile phone and PC respectively.

The invention has the advantages of high precision, low cost, convenient portability, good stability and wide application prospect.

Description of drawings

Fig. 1 is a block diagram of the present invention;

Fig. 2 is a schematic diagram of the panel structure of the present invention;

Fig. 3 is a schematic diagram of the internal structure of the present invention.

In the figure, 1. Main switch, 2. Display, 3. Laser button, 4. Measurement button, 5. Save data button, 6. Data display button, 7. GPS positioning button, 8. Clear button, 9. Laser emission hole , 10. Signal receiver, 11. SMS transmitting module, 12. Main board, 13. SD card slot, 14. Lithium battery, 15. ARM microcontroller, 16. GPS chip, 17. Signal amplifier, 18. Signal filter, 19 . Data transmission line, 20. Bluetooth, 21. Housing, 22. Panel, 23. Data transmission line.

Detailed ways

The specific embodiment of the present invention is such that the hand-held intelligent groundwater level laser measuring device is controlled by an ARM single-chip microcomputer, and consists of three units: laser emission and reception, signal processing, and result output. The laser transmitting and receiving unit is composed of laser transmitter, laser signal controller and laser signal receiver; the signal processing unit is composed of signal filter, signal amplifier, arithmetic unit and GPS positioning module; it is composed of storage and display, SMS transmitting module and Bluetooth The formed achievement transmitter constitutes an achievement output unit; it is connected with a computer through an achievement transmitter or an interface. After the laser transmitter and the laser signal controller emit the laser pulse, after being reflected by the water surface of the observation well, the reflected part of the laser light returns to the laser signal receiver and enters the signal processing unit. After the signal receiver converts the laser signal into the corresponding electrical signal, it is transmitted to the signal filter, and the instrument amplification technology is used to realize the algorithm based on the digital correlation with the ARM single-chip microcomputer, improve the signal-to-noise ratio, and effectively restore the weak signal submerged in the strong background noise , the extremely weak laser reflection signal is processed by the filter converter, and the electrical signal passes through the signal amplifier. The instrument amplification technology can detect and collect weak photoelectric signals, and has the advantages of small size, low power consumption, low temperature drift, and high anti-interference , Strong signal-to-noise ratio, large multiple op amp characteristics. It is mainly to remove common-mode interference, amplify useful signals, complete the pick-up of weak signals reflected from the water surface, and meet the level requirements of ARM microcontrollers. After that, the electrical signal enters the data calculator for calculation and GPS positioning. The calculated result is imported into the result output unit through the data transmission line. The calculation results include measurement time, latitude and longitude altitude, water level, etc., and the results are output in three ways. Immediately store and display on the machine; through the achievement transmitter composed of the SMS transmitting module and Bluetooth, the water level measurement is completed through the SMS transmitting module and Bluetooth synchronous transmission to the remote management mobile phone and PC respectively.

The handheld intelligent groundwater level laser measuring device is provided with a housing 21, and a panel 22 is provided on the housing 21. The panel 22 is provided with a main switch 1, a display screen 2, a laser button 3, a measurement button 4, and a data saving button 5. Data display button 6, GPS positioning button 7, clear button 8, laser emission hole 9 and signal receiver 10; housing 21 is provided with mainboard 12, on which mainboard 12 is provided with SD card slot 13, ARM single-chip microcomputer 15, GPS chip 16 , signal amplifier 17 and signal filter 18 are arranged on the main board 12, also be provided with short message transmission module 11 and bluetooth 20 in the housing 21; 11 and Bluetooth 20 power supply.

When in use, hold the laser, turn on the main switch 1 of the instrument before measuring the water level, and press the laser switch button 3 to turn on the laser transmitter 9 and the signal receiver 10 . Put the laser tip of the instrument straight down, facing the water surface. Press the measurement button 4, the laser light emitted by the laser transmitter 9 is reflected by the measured water surface and reaches the laser receiver 10, and the user can read the water level of the measured water surface on the instrument display panel. At the same time, the user can press the GPS positioning button to obtain the geographic coordinates of the measuring device. If the user is satisfied with this measurement, he can press the storage button 5, and the system will store the data in the SD memory card, or he can press the Bluetooth transmission button 6, and the data of this measurement (the water level and coordinates of the measured water surface ) are synchronously transmitted to the mobile phone or PC via Bluetooth. After one measurement, the result of this time can be cleared, and multiple measurements can be performed; after this well measurement, go to the next well measurement. When the laser receiver 10 receives the optical signal fed back by the water surface, the optical signal is converted into an electrical signal by the photoelectric signal converter 18 on the main board, enters the signal filter 18 through the data transmission line 19, and the effective signal after filtering enters the signal amplifier 17 , making the feedback signal easy to process. The amplified signal is transmitted to the ARM single-chip microcomputer, and the single-chip microcomputer processes the received electrical signal according to the preset algorithm to obtain the measurement result of the water level. Simultaneously bluetooth device 11, SD storage card slot 13, GPS chip 16 all connect with ARM single-chip microcomputer with wire, and coordinate work under the control of single-chip microcomputer. The single-chip microcomputer backs up the processing results, that is, the measurement results, to the SD memory card, and outputs them on the display screen. According to the measurement needs, it can also be sent to the mobile phone through Bluetooth immediately, and transmitted to the remote indoor PC through the SMS transmitting module device.

Claims (2)

1. a handheld-type intelligent underground water table laser measuring device for measuring, this device, by ARM Single-chip Controlling, includes Laser emission and reception, signal processing, three unit compositions of result output; It is characterized in that: form Laser emission and receiving element by generating laser, laser signal controller, laser signal receiver; Form signal processing unit by signal filter, signal amplifier, arithmetical unit and GPS locating module; Form result output unit by the achievement transmitter storing and display, note transmitter module and bluetooth form; Be connected with computing machine by achievement transmitter or interface; After described generating laser and laser signal controller send laser pulse, after inspection well water-reflected, the laser of reflecting part turns back to laser signal receiver, entering signal processing unit; Signal receiver is converted to laser signal after corresponding electric signal, be transferred to signal filter, adopt instrument amplifying technique to utilize the algorithm of ARM chip microcontroller based on digital correlation, improve signal to noise ratio (S/N ratio), there is efficient recovery to be submerged in the feeble signal in strong background noise, extremely faint laser reflection signal is after converter is processed after filtration, and electric signal amplifies through signal amplifier, and electric signal enters arithmetical unit and carries out computing and located by GPS locating module afterwards; Achievement after computing imports result output unit by data line; Computing achievement comprises Measuring Time, longitude and latitude sea level elevation, water level etc., point three kinds of mode outputting results; Immediately store, show in the machine storage and display; By the achievement transmitter being formed by note transmitter module and bluetooth, hold to telemanagement mobile phone, PC by note transmitter module, bluetooth synchronous transmission respectively, complete level measuring.

2. according to handheld-type intelligent underground water table laser measuring device for measuring claimed in claim 1, it is characterized in that: this device is provided with housing (21), housing (21) is provided with panel (22), and panel (22) is provided with master switch (1), display screen (2), laser instrument button (3), measures button (4), save data button (5), data the Show Button (6), GPS navigation button (7), reset button (8), laser emission port (9) and signal receiver (10); In housing (21), be provided with mainboard (12), mainboard (12) is provided with SD draw-in groove (13), it is upper that ARM single-chip microcomputer (15), GPS chip (16), signal amplifier (17) and signal filter (18) are arranged on mainboard (12), is also provided with note transmitter module (11) and bluetooth (20) in housing (21); Utilize lithium battery (14) to power to mainboard (12), note transmitter module (11) and bluetooth (20) respectively by data line (19) and data line (23).