Method and device for measuring water level in deep well

Abstract

The present invention belongs to the technical field of groundwater level measurement, and discloses a method for measuring water level in a deep well. An acoustic wave transmitter transmits acoustic wave signals from the water surface to the wellhead, and receives the acoustic wave signals propagated by the air and the acoustic wave signals propagated by the well wall on the same horizontal plane of the wellhead, and records the received time difference; according to the time difference, the propagation speed of the acoustic wave in the air is v1, and the propagation speed of the acoustic wave in the well wall is v2, the water depth is calculated. At the same time, a device for measuring water level in a deep well using ultrasonic waves is also disclosed. A method and device for measuring water level in a deep well with high reliability, high monitoring accuracy, low cost, strong versatility, and easy use are provided.

Description

Technical Field

[0001] The invention belongs to the field of groundwater level measurement, and in particular relates to a method and a device for measuring water level in a deep well. Background Art

[0002] As an important water resource, groundwater can be assessed to provide data for rational exploitation, monitor water level changes, and formulate water resource protection strategies. At the same time, it can understand the stability of geological structures and prevent geological disasters such as ground subsidence. Water resource detection can also determine the appropriate irrigation machine and water volume to improve the utilization efficiency of water resources. Therefore, its water level monitoring is of great significance to water resource management, geological research, environmental protection and other fields. Accurately measuring groundwater levels is crucial to understanding the dynamic changes of groundwater resources, rational development and utilization, and preventing related geological disasters.

[0003] At present, there are two main measurement technologies. One is the traditional measurement method, such as the steel ruler water level meter method and the clock method. The traditional measurement method is mainly used in small groundwater monitoring wells. It is simple to operate and low in cost, but the measurement results are not accurate enough and cannot be used for large and complex groundwater detection. The other is automatic detection technology, which is mainly used in large groundwater monitoring networks. It can monitor in real time, automatically monitor, and has high data accuracy, such as pressure water level measurement and acoustic water level measurement.

[0004] The basic principle of ultrasonic level measurement is that it consists of an ultrasonic transducer (probe), an electronic processing unit and a display unit. When working, the ultrasonic transducer emits an ultrasonic wave of a certain frequency, which propagates in the liquid and is reflected when it encounters the liquid surface. The reflected wave is received by the same transducer and converted into an electrical signal. By measuring the time required for the ultrasonic wave to be emitted and received (i.e., the transit time), combined with the propagation speed of the ultrasonic wave in the liquid, the propagation distance of the ultrasonic wave can be calculated, and then the distance from the liquid surface to the transducer can be determined, thereby obtaining the liquid level height.

[0005] However, the main problem in the practical application of sonic (ultrasonic) water level measurement is that the time required to measure the ultrasonic wave from emission to reception (i.e., transit time) is uncertain due to the complex measurement environment, narrow wellhead, many debris in the well, water quality and other environmental factors. The time to transmit the ultrasonic wave and the time to receive the ultrasonic wave affect the accuracy of transit time monitoring, and thus affect the accuracy of the entire water level measurement. For example, Chinese patent CN202011551013.X discloses an ultrasonic ranging sensor, which discloses in detail a measurement method processor for correcting the ultrasonic velocity according to the temperature value, comparing the time difference between the ultrasonic echo envelope and the transmission wave envelope, and calculating the position of the liquid level. The specific calculation of the position of the liquid level is D=V×Δt, 2, wherein D is the distance from the liquid surface to the transducer, Δt is the time difference between the echo envelope and the front edge of the transmission wave envelope, and the time Δt determines the first time the acoustic wave collector receives the acoustic wave signal and the second time the acoustic wave signal is received as the measurement time. However, in actual monitoring, due to the influence of the complex environment in the well, the time detection has errors, and it is difficult to determine whether the received signal is the signal at the time of transmission.

[0006] Currently, there are few reports on accurately determining the transit time and improving the accuracy of water level monitoring. Summary of the invention

[0007] To solve the above problems, the purpose of the present invention is to improve the accuracy of water level monitoring and provide a method and device for measuring water level in a deep well with high reliability, high monitoring accuracy, low cost, strong versatility and easy use.

[0008] To achieve the above objectives, the present invention provides the following technical solution, a method for measuring water level in a deep well, comprising the following steps: Step 1, sound wave emission: the sound wave transmitter emits sound wave signals from the water surface to the wellhead. The sound wave transmitter is connected to a microprocessor, and the microprocessor records the time when the sound wave transmitter emits the sound wave as the original time. Step 2, sound wave reception: the sound wave receiver is located on the same horizontal plane of the wellhead and receives the sound wave signal propagated by the air and the sound wave signal propagated by the well wall respectively, and converts the information of the received sound wave signal into an electrical signal and transmits it to the microprocessor. The microprocessor records the time when the sound wave receiver receives the sound wave signal propagated by the air within the original time as t1, and the microprocessor records the time when the sound wave receiver receives the sound wave signal propagated by the well wall within the original time as t2. Step 3, data processing: The microprocessor records the time difference of receiving the sound wave signal emitted at the same original time as t, The microprocessor calculates the time difference according to the time difference. t, the propagation speed of sound waves in the air is v1, the propagation speed of sound waves in the well wall is v2, and the water level depth is calculated , pass

[0009] Wherein, L is the depth of the measured water level, i.e., the distance between the measured water level and the wellhead, v1 is the propagation speed of the sound wave in the air, v2 is the propagation speed of the sound wave in the well wall, t1 is the propagation time of the sound wave in the air, t2 is the propagation speed of the sound wave in the well wall, and v2 is the propagation speed of the sound wave in the well wall. Step 4: Data monitoring: each time a sound wave signal is emitted, the water level depth is recorded and measured. , and displayed on the microprocessor.

[0010] In the method of the present invention, a timing module is provided in the microprocessor to record the time difference between the two sound wave receivers receiving the sound wave signal emitted by the sound wave transmitter. t, the microprocessor is equipped with a CPU processing module, which calculates the water depth according to the formula algorithm. The microprocessor processes signals quickly, responds quickly, and measures quickly and accurately. The timing accuracy of the timing module meets the measurement accuracy requirements, the computing speed and accuracy of the CPU processing module can quickly and accurately calculate the distance, and the display of the display module is clear and intuitive, making it easy to read the measurement results.

[0011] Furthermore, in step 1, a sound wave transmitter is set on the water surface to transmit sound wave signals upward, and two sound wave receivers are set on the well surface and on the same horizontal plane, one of which is set in the air to receive sound wave signals in the air, and the other is set on the well wall to receive sound wave signals on the well wall; the sound wave transmitter and the sound wave receiver signals are connected to a microprocessor. The sound wave transmitter is located on the water surface, and measures the time from the emission to the reception of the sound wave. The propagation time of the ultrasonic wave in the well is used to determine the water level, and the microprocessor is used to process the signal and calculate the water depth.

[0012] Note: The distance between the acoustic wave receiver A and the acoustic wave receiver B is fixed and known, and the distance is short. Compared with the length L of the water level, the distance can be ignored.

[0013] At the same time, a device for measuring water level in a deep well by using ultrasound is disclosed, comprising a sound wave transmitter, a sound wave receiver, and a microprocessor. The sound wave transmitter is arranged on the water surface for transmitting sound wave signals, the sound wave receiver is arranged at the wellhead for receiving sound wave signals, two sound wave receivers are arranged, and the two sound wave receivers are arranged on the same horizontal plane, and are divided into a sound wave receiver A and a sound wave receiver B. The sound wave receiver A is arranged in the air to receive sound waves propagated by the air, and the other sound wave receiver B is arranged on the well wall to receive sound waves propagated by the well wall; the microprocessor signal connects the sound wave transmitter and the sound wave receiver; a timing module, a CPU processing module, and a display module are arranged in the microprocessor, the timing module is used to record the time when the two sound wave receivers receive the sound wave signals emitted by the sound wave transmitter, the CPU processing module is used to calculate the distance between the sound wave transmitter and the sound wave receiver according to the information recorded by the timing module and the original set formula, and the display module is used to display the measured water level depth.

[0014] The microprocessor processes signals quickly, responds quickly, and measures quickly and accurately. The timing accuracy of the timing module meets the measurement accuracy requirements, the computing speed and accuracy of the CPU processing module can quickly and accurately calculate the distance, and the display of the display module is clear and intuitive, making it easy to read the measurement results.

[0015] Furthermore, the acoustic wave transmitter comprises an acoustic wave transmitting component, a driving circuit, a transmitting antenna, and a shell. The acoustic wave transmitting component and the driving circuit are arranged in the shell. The transmitting antenna is arranged at the top of the shell. The output end of the driving circuit is connected to the input end of the acoustic wave transmitting component, and the output end of the acoustic wave transmitting component is connected to the transmitting antenna. A floating board is arranged at the bottom of the shell. The floating board is arranged on the water surface. First, the output end of the driving circuit is connected to the input end of the acoustic wave transmitter. The electrical signal generated by the driving circuit is directly transmitted to the acoustic wave transmitter through wires or circuit wiring. The stability of the connection and good electrical contact must be ensured to avoid signal loss and interference. For example, a suitable plug, socket or welding method is used for connection. Then, the output end of the acoustic wave transmitter is connected to the transmitting antenna, and a suitable coupling element can be arranged between the two to achieve efficient electromagnetic coupling connection. The shell is waterproof, and the connection between the shell and the antenna needs to strengthen waterproofness.

[0016] Furthermore, two timers are set in the microprocessor, including timer A and timer B. When the sound wave transmitter transmits a sound wave, the two timers start timing. When the sound wave receiver A receives the sound wave signal, timer A stops timing and records the time as t1; when the sound wave receiver B receives the sound wave signal, timer B stops timing and records the time as t2. The microprocessor is provided with a timing module to record the time difference between the two sound wave receivers receiving the sound wave signal emitted by the sound wave transmitter. t. The timing module is used to record the time when the two sound wave receivers receive the sound wave signal emitted by the sound wave transmitter, and the timing accuracy meets the measurement accuracy requirements. The microprocessor is equipped with a CPU processing module, which calculates the water depth according to the set formula algorithm. The computing speed and accuracy of the CPU processing module can quickly and accurately calculate the distance.

[0017] Furthermore, the acoustic wave receiver A and the acoustic wave receiver B are arranged on a sliding rod, the sliding rod is fixed on the wellhead, the receiving sensor of the acoustic wave receiver A is located in the air, and the receiving sensor of the acoustic wave receiver B is located on the well wall. The sliding rod makes the acoustic wave receiver A and the acoustic wave receiver B on the same horizontal plane, and the acoustic wave receiver A is located in the air for receiving the acoustic wave signal transmitted by the air.

[0018] Furthermore, the sound wave signal emitted by the sound wave transmitter is a pulse signal of a specific frequency and wavelength. The preferred frequency of the ultrasonic wave is about 40kHz. The frequency of the emitted sound wave signal is specific and easy to record.

[0019] The present invention provides a method for measuring water level in a deep well, aiming to provide the industry with innovative and practical technical solutions, which have the advantages of high reliability, high monitoring accuracy, low cost, strong versatility, and easy use. Compared with the prior art method of calculating water depth by using the refraction of a mirror, the accuracy is improved, which is mainly reflected in that, affected by the environment in the well, there are many refraction surfaces, and there are several refraction surfaces on the well wall, which leads to the need for continuous optimization of the measurement results, a large workload, time-consuming and labor-intensive, and high cost. At the same time, the time of emitting an ultrasonic wave and the time of receiving the ultrasonic wave are uncertain, and the equipment and method used in this patent can effectively solve this problem. Specifically: High reliability, using the propagation time of ultrasonic waves in the well to determine the water level, using the time difference t, the propagation speed of sound waves in the air is v1, and the propagation speed of sound waves in the well wall is v2, and the water depth is calculated.

[0020] The monitoring accuracy is high. The measurement method adopts a new design concept to improve the detection accuracy. Since the emission time of the same ultrasonic wave is consistent, it is easy to monitor. The time when different receivers receive the same ultrasonic wave signal is also easy to monitor. Compared with the method in the prior art, the time detection error is small, so the detection result is highly accurate.

[0021] Low cost. Acoustic wave measurement mainly relies on acoustic wave transmitters and receivers. The manufacturing process of these components is relatively mature. The equipment is mature and stable, with low energy consumption and little damage, which reduces the frequency of equipment replacement and has a relatively low cost.

[0022] The device of the present invention has strong versatility and can be applied to deep wells of various types and depths, thereby reducing the cost of additional development or purchase of special equipment to adapt to different environments.

[0023] It is easy to use, adopts automatic monitoring, and the system runs automatically. There is no need for manual timing operation of measuring equipment, which greatly reduces the burden of manpower and can be intelligentized. For example, the water level threshold is set in the microprocessor. When the water level exceeds or falls below the set value, an alarm signal is automatically issued to remind relevant personnel to take timely measures. In flood control work, when the water level reaches the warning value, the system automatically sends an alarm to the flood control command center so that rescue can be organized in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a schematic diagram of the structure of the sound wave transmitter of the present invention.

[0026] In the figure: 1. Sound wave receiver A; 2. Sound wave receiver B; 3. Sound wave transmitter; 4. Sliding rod; 5. Sound wave generator; 6. Driving circuit; 7. Transmitting antenna; 8. Shell; 9. Floating board. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", "one side", "the other side", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Example

[0029] like Figure 1As shown, at the same time, a device for measuring water level in a deep well using ultrasonic waves is disclosed, including a sound wave transmitter 3, a sound wave receiver A1 and a sound wave receiver B2, and a microprocessor. The sound wave transmitter is arranged on the water surface for transmitting sound wave signals, and the sound wave receiver is arranged at the wellhead for receiving sound wave signals. Two sound wave receivers are arranged, which are divided into a sound wave receiver A and a sound wave receiver B. The sound wave receiver A and the sound wave receiver B are arranged on a sliding rod 4, and the sliding rod is fixed on the wellhead. The receiving sensor of the sound wave receiver A is located in the air, and the receiving sensor of the sound wave receiver B is located on the well wall. The sliding rod enables the sound wave receiver A to receive sound wave signals transmitted by the air, and enables the two sound wave receivers to be arranged on the same horizontal plane. The sound wave receiver A is arranged in the air to receive sound waves transmitted by the air, and the other sound wave receiver B is arranged on the well wall to receive sound waves transmitted by the well wall. The microprocessor signal connects the sound wave transmitter and the sound wave receiver; the microprocessor is provided with a timing module, a CPU processing module, and a display module. The timing module is used to record the time when the two sound wave receivers receive the sound wave signal emitted by the sound wave transmitter. The CPU processing module is used to calculate the distance between the sound wave transmitter and the sound wave receiver according to the information recorded by the timing module and the original set formula. The display module is used to display the measured water level depth.

[0030] like Figure 2 As shown, the acoustic wave transmitter includes an acoustic wave transmitting component 5, a driving circuit 6, a transmitting antenna 7, and a shell 8. The shell is provided with an acoustic wave transmitting component and a driving circuit. The transmitting antenna is arranged at the top of the shell. The output end of the driving circuit is connected to the input end of the acoustic wave transmitting component. The acoustic wave transmitting component is connected to the driving circuit, and the output end of the acoustic wave transmitting component is connected to the transmitting antenna. A floating board 9 is arranged on the bottom of the shell. The floating board is arranged on the water surface. First, the output end of the driving circuit is connected to the input end of the acoustic wave transmitting component. The electrical signal generated by the driving circuit is directly transmitted to the acoustic wave transmitting component through wires or circuit wiring. The stability of the connection and good electrical contact must be ensured to avoid signal loss and interference. For example, a suitable plug, socket or welding method is used for connection. Then, the output end of the acoustic wave transmitting component is connected to the transmitting antenna, and a suitable coupling element can be arranged between the two to achieve efficient electromagnetic coupling connection. The shell is waterproof, and the connection between the shell and the antenna needs to strengthen waterproofness.

[0031] The sound wave signal emitted by the sound wave transmitter is a pulse signal of a specific frequency and wavelength. In this embodiment, the frequency of the ultrasonic wave is about 40kHz. The frequency of the emitted sound wave signal is specific and easy to record.

[0032] Among them, two timers are set in the microprocessor. When the sound wave transmitter emits sound waves, the two timers start timing respectively. When the sound wave receiver A receives the sound wave signal, one of the timers stops timing. When the sound wave receiver B receives the sound wave signal, the other timer stops timing. The recorded time is t1 and the time is t2. The microprocessor is provided with a timing module to record the time difference between the two sound wave receivers receiving the sound wave signal emitted by the sound wave transmitter. t. The timing module is used to record the time when the two sound wave receivers receive the sound wave signal emitted by the sound wave transmitter, and the timing accuracy meets the measurement accuracy requirements. The microprocessor is equipped with a CPU processing module, which calculates the water depth according to the set formula algorithm. The computing speed and accuracy of the CPU processing module can quickly and accurately calculate the distance.

[0033] In actual applications, the sound wave transmitter and the sound wave receiver are connected to the output and input ports of the microprocessor through the interface circuit. The microprocessor signal connects the sound wave transmitter and the two sound wave receivers; it is used to receive and process signals, calculate formulas and display the water level depth. The microprocessor is equipped with a timing module, a CPU processing module and a display module. The timing module is used to record the time when the two sound wave receivers receive the sound wave signal emitted by the sound wave transmitter. The timing module includes two counters, which respectively record the time when the two sound wave receivers receive the emitted sound wave signal; the CPU processing module is used to calculate the distance between the sound wave transmitter and the sound wave receiver according to the information recorded by the timing module and the original set formula, and the display module is used to display the measured water level depth. Example

[0034] The water level is measured using the device of Example 1. The following steps are included: Step 1: The acoustic wave transmitter transmits an acoustic wave signal from the water surface to the wellhead. According to the actual application site, a lower frequency of 20-40kHz is generally selected. The acoustic wave signal propagated by the air and the acoustic wave signal propagated by the well wall are received on the same horizontal plane of the wellhead, and the received time difference is recorded as t;

[0035] Step 2: Based on the time difference t, the propagation speed of sound waves in the air is v1, the propagation speed of sound waves in the well wall is v2, the water depth is calculated, Depth by Formula Knowable

[0036]

[0037] It can be seen that

[0038] Among them, L is the depth of the measured water level, that is, the length of the measured water level from the wellhead, v1 is the propagation speed of sound waves in the air, v2 is the propagation speed of sound waves in the well wall, t1 is the propagation time of sound waves in the air, and t2 is the propagation speed of sound waves in the well wall, which is v2.

[0039] In step 1, a sound wave transmitter is set on the water surface to transmit sound wave signals upwards, and two sound wave receivers are set on the well surface and on the same horizontal plane, one of which is set in the air to receive sound wave signals in the air, and the other is set on the well wall to receive sound wave signals on the well wall; the sound wave transmitter and the sound wave receiver signals are connected to a microprocessor. The sound wave transmitter is located on the water surface, and measures the time from the emission to the reception of the sound wave. The propagation time of the ultrasonic wave in the well is used to determine the water level, and the microprocessor is used to process the signal and calculate the water depth.

[0040] The method of this embodiment is actually applied to water level monitoring in the xx project and plays a vital role in the project.

[0041] When selecting the frequency of the ultrasonic level meter, it is necessary to comprehensively consider factors such as measurement accuracy requirements, measurement range, liquid characteristics, and application environment. The frequency of the ultrasonic wave used in this project is about 40kHz. The device with the appropriate range is selected according to the specific range of the measured water depth (depending on the model of the ultrasonic transmitter used).

[0042] The ultrasonic transmitter emits ultrasonic waves once a second, and the microprocessor receives and processes data continuously: The propagation speed of sound waves in the air is v1=340m / s, the propagation speed of sound waves in the well wall is v2=6300m / s, the propagation time of sound waves in the air is t1=0.38235 seconds, and the propagation time of sound waves in the well wall is t2=0.02063 seconds.

[0043] Measure L= =130.00071 meters.

[0044] The propagation speed of sound waves in the air is v1=340m / s, the propagation speed of sound waves in the well wall is v2=6300m / s, the propagation time of sound waves in the air is t1=0.38234 seconds, and the propagation time of sound waves in the well wall is t2=0.02059 seconds.

[0045] Measure L= =129.99560 meters.

[0046] The measured data are stored in the microprocessor. When the value exceeds the preset threshold, an alarm can be selected. The display of the microprocessor changes the water level depth every 1 second, which is convenient for on-site staff to check.

[0047] By adopting the method of this embodiment, water level data can be obtained in real time and accurately, providing a reliable basis for project decision-making. The real-time monitored data is directly transmitted to the monitor to display the water level in real time. Continuous water level monitoring can detect abnormal changes in water level in time, so as to take countermeasures in advance to ensure the normal operation of the project and the safety of the surrounding environment. In the xx project, accurate monitoring of water level is of great significance to the smooth progress and safe operation of the project.

[0048] Note: The distance between the acoustic wave receiver A and the acoustic wave receiver B is fixed and known, and the distance is short. Compared with the length L of the water level, the distance can be ignored.

[0049] The above are only preferred technical solutions of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements without departing from the principles of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A device for measuring water level in a deep well, characterized in that: Including sound wave transmitter, sound wave receiver, microprocessor, The acoustic wave transmitter is set on the water surface to transmit the acoustic wave signal. An acoustic wave receiver is arranged at the wellhead for receiving acoustic wave signals. Two acoustic wave receivers are arranged on the same horizontal plane, and are divided into an acoustic wave receiver A and an acoustic wave receiver B. The acoustic wave receiver A is arranged in the air to receive the sound waves propagated by the air, and the acoustic wave receiver B is arranged on the well wall to receive the sound waves propagated by the well wall. The microprocessor signal connects the sound wave transmitter and the sound wave receiver; The microprocessor is equipped with a timing module, a CPU processing module, and a display module. The timing module is used to record the time when two sound wave receivers receive the sound wave signal emitted by the sound wave transmitter. The CPU processing module is used to calculate the distance between the sound wave transmitter and the sound wave receiver according to the information recorded by the timing module and the original set formula. The display module is used to display the measured water level depth.

2. The device according to claim 1, characterized in that: The sound wave transmitter comprises a sound wave transmitting component, a driving circuit, a transmitting antenna and a shell. The shell is provided with the sound wave transmitting component and the driving circuit. The transmitting antenna is arranged on the top of the shell. The output end of the driving circuit is connected to the input end of the sound wave transmitting component. The output end of the sound wave transmitting component is connected to the transmitting antenna. A floating board is provided at the bottom of the shell.

3. The device according to claim 1, characterized in that: The acoustic wave receiver A and the acoustic wave receiver B are arranged on a sliding rod, and the sliding rod is fixed on the wellhead.

4. The device according to claim 1, characterized in that: Two timers are set in the microprocessor, including timer A and timer B. When the sound wave transmitter emits sound waves, the two timers start timing. When the sound wave receiver A receives the sound wave signal, timer A stops timing and the recorded time is t1; when the sound wave receiver B receives the sound wave signal, timer B stops timing and the recorded time is t2.

5. The device according to claim 1, characterized in that: The sound wave signal emitted by the sound wave transmitter is a pulse signal with a specific frequency and wavelength.

6. The device according to claim 4, characterized in that: The frequency of the sound waves is about 40kHz.

7. A method for measuring water level in a deep well, characterized in that: The following steps are involved: Step 1, sound wave emission: the sound wave transmitter emits sound wave signals from the water surface to the wellhead. The sound wave transmitter is connected to a microprocessor, and the microprocessor records the time when the sound wave transmitter emits the sound wave as the original time. Step 2, sound wave reception: The sound wave receiver is located on the same horizontal plane of the wellhead and receives the sound wave signal propagated by the air and the sound wave signal propagated by the well wall respectively, and converts the information of the received sound wave signal into an electrical signal and transmits it to the microprocessor. The microprocessor records the time when the sound wave receiver receives the sound wave signal propagated by the air within the original time as t1, and the microprocessor records the time when the sound wave receiver receives the sound wave signal propagated by the well wall within the original time as t2. Step 3, data processing: The microprocessor records the time difference of receiving the sound wave signal emitted at the same original time as t, ; The microprocessor calculates the time difference according to the time difference t, the propagation speed of sound waves in the air is v1, the propagation speed of sound waves in the well wall is v2, and the water level depth is calculated , ， Wherein, L is the depth of the measured water level, i.e., the distance between the measured water level and the wellhead, v1 is the propagation speed of the sound wave in the air, v2 is the propagation speed of the sound wave in the well wall, t1 is the propagation time of the sound wave in the air, t2 is the propagation speed of the sound wave in the well wall, and v2 is the propagation speed of the sound wave in the well wall. Step 4: Data monitoring: each time a sound wave signal is emitted, the water level depth is recorded and measured. , and displayed on the microprocessor.

8. The method according to claim 7, characterized in that: In step 1, a sound wave transmitter is set on the water surface to emit sound wave signals upward, and two sound wave receivers are set on the well surface and on the same horizontal plane, one of which is set in the air to receive sound wave signals in the air, and the other is set on the well wall to receive sound wave signals on the well wall; the sound wave transmitter and the sound wave receiver signals are connected to a microprocessor.

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