CN116858339A - Quick inspection well liquid level measurement method and system - Google Patents
Quick inspection well liquid level measurement method and system Download PDFInfo
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- CN116858339A CN116858339A CN202310871326.0A CN202310871326A CN116858339A CN 116858339 A CN116858339 A CN 116858339A CN 202310871326 A CN202310871326 A CN 202310871326A CN 116858339 A CN116858339 A CN 116858339A
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- 239000007788 liquid Substances 0.000 title claims abstract description 77
- 238000007689 inspection Methods 0.000 title claims abstract description 39
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
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Abstract
The application provides a rapid inspection well liquid level measurement method and a rapid inspection well liquid level measurement system, wherein the rapid inspection well liquid level measurement method comprises the following steps: correcting a probe blind area: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid; a liquid level measuring step: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level. The method can directly measure the underground liquid level height through various manhole covers with holes without opening the manhole cover, greatly shortens the time and labor of measurement operation, and improves the safety of the road operation of workers.
Description
Technical Field
The application relates to the technical field of liquid level measurement, in particular to a rapid inspection well liquid level measurement method and system.
Background
At present, a large number of underground drainage pipe networks, such as sewage pipe networks, rainwater pipe networks and the like, exist in cities, and each underground pipe network has an inspection well at intervals (for example, 50 meters), and the water level in the inspection well is monitored due to the fact that the conditions in the inspection well are severe, and the water level sensor is difficult to arrange.
In chinese patent document with publication number CN112729480a, a "integrated device for detecting water level of pipe network inspection well" is disclosed, for installation, maintenance and communication effect, usually a host is installed at the wellhead of the inspection well, the lower part of the host is connected to the lowest water level sensor through a water level sensor cable, the water level sensor needs to enter water, which indicates that the water level sensor is a contact pressure water level sensor, and there are the following problems: in order to detect the lowest water level, the contact pressure water level sensor must be arranged at the lowest point of the water level, and the lowest point of the water level of the drainage pipeline must be provided with sludge capable of blocking the water level sensor, which also limits the practicability of the technology.
The conventional ultrasonic liquid level detection equipment can only measure data in a wide distance, so that a common method is to open a manhole cover and use an ultrasonic distance measuring device to measure the liquid level at a manhole opening, but the measuring method is large in workload, time-consuming and labor-consuming, and is not beneficial to conventional detection of the manhole.
The conventional manhole cover of the rainwater underground water channel in China is generally provided with two small holes for opening the manhole cover, if the probe is measured through the small holes of the manhole cover, the echo time of the probe at a short distance is increased due to the thickness of the manhole cover, so that data are disordered or unstable.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a rapid inspection well liquid level measurement method and system.
The application provides a rapid inspection well liquid level measurement method, which comprises the following steps:
correcting a probe blind area: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid;
a liquid level measuring step: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level.
Preferably, the probe blind area correction step includes:
step S1: setting an ultrasonic ranging sensor at a small hole of the well lid, and setting the transmitting power of the ultrasonic ranging sensor to be the lowest level;
step S2: sending out ultrasonic pulse by an ultrasonic ranging sensor, receiving echo in a specified time under the power, and continuously and digitally quantizing the echo into digital quantity data of echo amplitude;
step S3: comparing the echo data point by point with a threshold value, taking the last data smaller than the threshold value in the echo data as a dead zone critical point under the transmitting power, recording the position of the data and storing the position;
step S4: and (3) increasing the transmitting power of the ultrasonic ranging sensor by one step, repeatedly executing the steps S2-S3 until the blind area critical point corresponding to the maximum transmitting power is recorded, returning the power of the ultrasonic ranging sensor to zero, and ending the correction.
Preferably, the liquid level measuring step includes:
step A1: an ultrasonic ranging sensor penetrates through a small hole of a well lid and emits ultrasonic pulses, the ultrasonic ranging sensor immediately turns into a receiving state after the emission is finished, and echo data with set duration are received and digitally quantized;
step A2: acquiring a blind area critical point under the transmitting power, as effective starting time for calculating echo time, resetting echo data before the effective starting time point, and demodulating updated echo data to obtain a peak value position;
step A3: and (3) judging the size of the peak value, if the peak value is smaller than a preset value, increasing the transmitting power of the ultrasonic ranging sensor, returning to the step (A1), and if the peak value is larger than the preset value, carrying out liquid level measurement according to the peak value position.
Preferably, the time from the effective start time to the time of the ultrasonic pulse reflected back to the ultrasonic ranging sensor plus the dead zone time is the flight time t2 of the ultrasonic probe to the target object back and forth once, then the distance from the ultrasonic ranging sensor to the liquid levelV is the speed of ultrasound in air.
Preferably, the probe blind area correction step is performed when the ultrasonic ranging sensor is first used or replaced.
According to the application, a rapid inspection well liquid level measurement system comprises:
probe blind area correction module: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid;
a liquid level measurement module: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level.
Preferably, the probe blind area correction module includes:
module M1: setting an ultrasonic ranging sensor at a small hole of the well lid, and setting the transmitting power of the ultrasonic ranging sensor to be the lowest level;
module M2: sending out ultrasonic pulse by an ultrasonic ranging sensor, receiving echo in a specified time under the power, and continuously and digitally quantizing the echo into digital quantity data of echo amplitude;
module M3: comparing the echo data point by point with a threshold value, taking the last data smaller than the threshold value in the echo data as a dead zone critical point under the transmitting power, recording the position of the data and storing the position;
module M4: and (3) increasing the transmitting power of the ultrasonic ranging sensor by one step, repeatedly entering the modules M2-M3 until the blind area critical point corresponding to the maximum transmitting power is recorded, returning the power of the ultrasonic ranging sensor to zero, and ending correction.
Preferably, the liquid level measurement module comprises:
module A1: an ultrasonic ranging sensor penetrates through a small hole of a well lid and emits ultrasonic pulses, the ultrasonic ranging sensor immediately turns into a receiving state after the emission is finished, and echo data with set duration are received and digitally quantized;
module A2: acquiring a blind area critical point under the transmitting power, as effective starting time for calculating echo time, resetting echo data before the effective starting time point, and demodulating updated echo data to obtain a peak value position;
module A3: and (3) judging the size of the peak value, if the peak value is smaller than a preset value, increasing the transmitting power of the ultrasonic ranging sensor, returning to the step (A1), and if the peak value is larger than the preset value, carrying out liquid level measurement according to the peak value position.
Preferably, the time from the effective start time to the time of the ultrasonic pulse reflected back to the ultrasonic ranging sensor plus the dead zone time is the flight time t2 of the ultrasonic probe to the target object back and forth once, then the distance from the ultrasonic ranging sensor to the liquid levelV is the speed of ultrasound in air.
Preferably, the probe blind zone correction module is executed when the ultrasonic ranging sensor is first used or replaced.
Compared with the prior art, the application has the following beneficial effects:
1. the method can directly measure the underground liquid level height through various manhole covers with holes without opening the manhole cover, and the time for one-man operation to finish one-time measurement is not more than 10 seconds. The time and the manpower of the measurement operation are greatly shortened, and the safety of the road operation of workers is improved.
2. The method of the application can also adapt the instrument to ultrasonic probes with various specifications and models, because the dead zone time of probes with different models and different powers of different manufacturers is quite different, when the instrument changes a probe with different models, the dead zone parameters of the current probe can be obtained through the probe automatic scanning function and stored in the instrument memory, so that the instrument can be almost perfectly matched with any probe with the same frequency.
Other advantages of the present application will be set forth in the description of specific technical features and solutions, by which those skilled in the art should understand the advantages that the technical features and solutions bring.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of probe blind area correction in the quick inspection well liquid level measurement method disclosed by the application;
FIG. 2 is a flow chart of the liquid level measurement in the method for measuring liquid level of the quick inspection well disclosed by the application;
FIG. 3 is a circuit topology diagram of the rapid inspection well liquid level measurement circuit disclosed by the application;
FIG. 4 is a schematic diagram of a rapid inspection well liquid level measurement device disclosed by the application;
FIG. 5 is a schematic view of an ultrasonic probe according to the present application
FIG. 6 is a schematic diagram of an ultrasonic blind area after the interference of a well lid is superimposed;
FIG. 7 is a graph showing the comparison of ultrasonic blind areas in the present application.
Reference numerals illustrate:
original ranging starting position 6 of ultrasonic probe 1
Target reflected wave 7 of fixed support 2
Blind zone waveform 8 of measuring instrument 3 after overlapping well cover
Ranging starting position 9 after correcting manhole cover small hole 4
Blind zone waveform 5
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present application.
The application provides a rapid inspection well liquid level measurement method, which comprises the following steps:
correcting a probe blind area: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid;
a liquid level measuring step: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level.
In this embodiment, the ultrasonic ranging sensor may be an ultrasonic probe, in the correction process, the ultrasonic probe is attached to a small hole of the well lid, the small hole faces to a clear place or sky, a correction instruction is sent to the device, the device automatically starts to emit an ultrasonic signal with increasing continuous power from minimum ultrasonic emission power to maximum power, and simultaneously continuously samples and receives an echo, and records a dead zone critical point of the echo in a memory of the device as a dead zone reference value measured later, so that the reflected clutter interference caused by the well lid can be avoided normally as long as the corresponding dead zone distance is found according to the current ultrasonic emission power for measuring later, and the liquid level is measured normally. The probe blind area correction step is performed when the ultrasonic ranging sensor is first used or replaced.
In a preferred embodiment, referring to fig. 1, the probe blind area correction step includes:
step S1: setting an ultrasonic ranging sensor at a small hole of the well lid, and setting the transmitting power of the ultrasonic ranging sensor to be the lowest level;
step S2: sending out ultrasonic pulse by an ultrasonic ranging sensor, receiving echo in a specified time under the power, and continuously and digitally quantizing the echo into digital quantity data of echo amplitude;
step S3: comparing the echo data point by point with a threshold value, taking the last data smaller than the threshold value in the echo data as a dead zone critical point under the transmitting power, recording the position of the data and storing the position;
step S4: and (3) increasing the transmitting power of the ultrasonic ranging sensor by one step, repeatedly executing the steps S2-S3 until the blind area critical point corresponding to the maximum transmitting power is recorded, returning the power of the ultrasonic ranging sensor to zero, and ending the correction.
The ultrasonic measuring circuit adopts the technology of Automatic Power Control (APC) to ensure that the measuring range of the ultrasonic sensor meets a large range, simultaneously the dead zone of measurement is minimized as much as possible, and simultaneously the output power of ultrasonic pulse is continuously adjustable from zero to the maximum value.
In a preferred embodiment, referring to the drawings, the liquid level measuring step includes:
step A1: an ultrasonic ranging sensor penetrates through a small hole of a well lid, transmits ultrasonic pulses, immediately turns into a receiving state after transmission is finished, and receives and digitally quantizes echo data of a period of about 100 ms;
step A2: acquiring a blind area critical point under the transmitting power, as effective starting time for calculating echo time, resetting echo data before the effective starting time point, and demodulating updated echo data to obtain a peak value position; the peak position is the echo reflected by the target position, which is the liquid level when the liquid level is measured.
Step A3: and (3) judging the size of the peak value, if the peak value is smaller than a preset value, increasing the transmitting power of the ultrasonic ranging sensor, returning to the step (A1), and if the peak value is larger than the preset value, carrying out liquid level measurement according to the peak value position.
In a preferred embodiment, the level measurement is in particular: the time from the effective starting time to the time of reflecting back to the ultrasonic distance measuring sensor and the dead zone time are the flight time t2 of the ultrasonic probe to the target object for one time, then the distance from the ultrasonic distance measuring sensor to the liquid levelV is the speed of ultrasound in air.
The application also provides a quick inspection well liquid level measurement system which can be realized by executing the flow steps of the quick inspection well liquid level measurement method, namely, the quick inspection well liquid level measurement method can be understood as a preferred implementation mode of the quick inspection well liquid level measurement system by a person skilled in the art.
The application also discloses a rapid inspection well liquid level measurement system, which comprises:
probe blind area correction module: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid;
a liquid level measurement module: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level.
The probe blind zone correction module is executed when the ultrasonic ranging sensor is first used or replaced.
In a preferred embodiment, the probe blind zone correction module includes:
module M1: setting an ultrasonic ranging sensor at a small hole of the well lid, and setting the transmitting power of the ultrasonic ranging sensor to be the lowest level;
module M2: sending out ultrasonic pulse by an ultrasonic ranging sensor, receiving echo in a specified time under the power, and continuously and digitally quantizing the echo into digital quantity data of echo amplitude;
module M3: comparing the echo data point by point with a threshold value, taking the last data smaller than the threshold value in the echo data as a dead zone critical point under the transmitting power, recording the position of the data and storing the position;
module M4: and (3) increasing the transmitting power of the ultrasonic ranging sensor by one step, repeatedly entering the modules M2-M3 until the blind area critical point corresponding to the maximum transmitting power is recorded, returning the power of the ultrasonic ranging sensor to zero, and ending correction.
In a preferred embodiment, the fluid level measurement module comprises:
module A1: an ultrasonic ranging sensor penetrates through a small hole of a well lid and emits ultrasonic pulses, the ultrasonic ranging sensor immediately turns into a receiving state after the emission is finished, and echo data with set duration are received and digitally quantized;
module A2: acquiring a blind area critical point under the transmitting power, as effective starting time for calculating echo time, resetting echo data before the effective starting time point, and demodulating updated echo data to obtain a peak value position;
module A3: and (3) judging the size of the peak value, if the peak value is smaller than a preset value, increasing the transmitting power of the ultrasonic ranging sensor, returning to the step (A1), and if the peak value is larger than the preset value, carrying out liquid level measurement according to the peak value position.
The time from the effective starting time to the time of reflecting back to the ultrasonic distance measuring sensor and the dead zone time are the flight time t2 of the ultrasonic probe to the target object for one time, then the distance from the ultrasonic distance measuring sensor to the liquid levelV is the speed of ultrasound in air.
The application also discloses a quick inspection well liquid level measuring circuit, which aims at the situation that conventional ultrasonic liquid level detecting equipment can only measure data in a wide distance, if a probe is measured through a small hole of a well cover, the echo time of the probe in a short distance is increased due to the thickness of the well cover, so that the data is disordered or unstable. The device adopts an ultrasonic detection technology capable of automatically scanning and correcting the distance of the blind area of the ultrasonic probe 1, and realizes the function of rapidly measuring the liquid level through the small hole 4 of the well cover without opening the well cover.
The application, with reference to fig. 3, comprises: an ultrasonic transmitting circuit, an ultrasonic echo receiving circuit, a CPU control circuit, a memory, and an ultrasonic probe 1. The CPU control circuit is respectively and electrically connected with the ultrasonic transmitting circuit and the ultrasonic echo receiving circuit, and the ultrasonic probe 1 is respectively and electrically connected with the ultrasonic transmitting circuit and the ultrasonic echo receiving circuit; the ultrasonic transmitting circuit comprises an ultrasonic power driving circuit, the ultrasonic power driving circuit adjusts ultrasonic power of the ultrasonic probe 1 according to instructions of the CPU control circuit, the ultrasonic echo receiving circuit receives and calculates probe blind area critical points of each power point at the manhole cover small hole 4, and the position of the probe blind area critical points is used as an ultrasonic ranging starting point. The memory stores probe blind area critical points of each power point of the ultrasonic probe 1 at the manhole cover small hole 4, the position of the probe blind area critical points is used as an ultrasonic ranging starting point, and the CPU control circuit measures the liquid level according to ultrasonic power and the corresponding probe blind area critical points.
The dead zone critical points stored in the memory are obtained by adopting a probe dead zone correction step in the rapid inspection well liquid level measurement method.
The CPU control circuit controls the output power of the ultrasonic probe 1 to gradually increase from zero to full power, the echo receiving circuit synchronously receives and calculates the probe blind area critical point of each power point, by the probe automatic scanning correction technology, the ultrasonic probe 1 is scanned for a blind area boundary before measurement, the data of the probe blind area of each power point is stored in the memory after scanning and used as a blind area reference value for the later measurement, and the later measurement can normally avoid the reflection clutter interference caused by the well cover to normally measure the liquid level as long as the corresponding blind area distance is searched according to the current ultrasonic emission power.
In a preferred embodiment, the same inspection well cover or the same hole structure is adopted for carrying out blind area boundary scanning before measurement, probe blind area critical points of all power points are obtained after measurement, and the blind area data are stored in a memory. During measurement, proper ultrasonic transmitting power is selected according to the liquid level depth and the acquired ultrasonic waveform, and the height of the liquid level is calculated according to an ultrasonic blind area corresponding to the ultrasonic transmitting power point.
In a preferred embodiment, the ultrasonic transmitting circuit comprises a DAC program-controlled voltage signal, a program-controlled boost power supply, a DDS ultrasonic signal generating circuit and a gating logic signal generating circuit; the DAC program-controlled voltage signal is respectively and electrically connected with the CPU control circuit and the program-controlled boost power supply, the program-controlled boost power supply is electrically connected with the ultrasonic power driving circuit, the DDS ultrasonic signal generating circuit is respectively and electrically connected with the CPU control circuit and the gating logic signal generating circuit, and the gating logic signal generating circuit is electrically connected with the ultrasonic power driving circuit.
The DAC program-controlled voltage signal generates a voltage scanning signal from low to high according to an instruction of the CPU control circuit, the program-controlled boosting power supply generates a voltage signal with a corresponding amplitude according to the voltage scanning signal to the ultrasonic power driving circuit, and the ultrasonic power driving circuit adjusts the generation power of the ultrasonic probe 1 according to the voltage signal. The transmission power of the ultrasonic probe 1 is gradually increased from zero, and the detection range is from near to far to search for a target. 5. The ultrasonic measuring circuit adopts the technology of Automatic Power Control (APC) to ensure that the measuring range of the ultrasonic sensor meets a large range, simultaneously the dead zone of measurement is minimized as much as possible, and simultaneously the output power of ultrasonic pulse is continuously adjustable from zero to the maximum value.
In a preferred embodiment, the ultrasonic echo receiving circuit includes an AD conversion circuit, a narrowband bandpass filter circuit, and a pre-differential amplifying circuit; the AD conversion circuit is electrically connected with the CPU control circuit and the narrow-band-pass filter circuit respectively, the pre-differential amplification circuit is electrically connected with the narrow-band-pass filter circuit, and the pre-differential amplification circuit is electrically connected with the ultrasonic probe 1.
The pre-differential amplifying circuit amplifies the ultrasonic echo signals, the narrow-band bandpass filtering circuit filters the amplified ultrasonic echo signals, and the AD converting circuit converts the ultrasonic echo signals into digital signals.
When in measurement, the ultrasonic transmitting circuit gradually increases the transmitting power from zero until the CPU calculates that the amplitude of the echo signal reaches a reasonable amplitude, then the CPU control circuit sends an instruction to the DAC program-controlled voltage signal circuit to stop the voltage scanning, so that the program-controlled boosting power supply keeps the current voltage amplitude, the CPU searches the corresponding dead zone critical point in the memory according to the current transmitting power as the starting point for calculating the ultrasonic flight time, and starts an ultrasonic flight time calculation program to calculate the measuring result, thus avoiding extra clutter interference caused by a well cover.
The application also discloses a quick inspection well liquid level measuring device, which is shown by referring to fig. 4 and comprises a quick inspection well liquid level measuring circuit, a fixed support 2 and a measuring instrument 3, wherein the ultrasonic probe 1 is arranged at the bottom of the fixed support 2, the measuring instrument 3 is arranged on the fixed support 2, and the ultrasonic transmitting circuit, the ultrasonic echo receiving circuit and the CPU control circuit are all arranged in the measuring instrument 3. The fixing support 2 can adopt a tripod, and the tripod plays a role in fixing and supporting.
In a preferred embodiment, the ultrasonic probe 1 is provided in a replaceable manner, and the critical point of the probe blind area of the replaced ultrasonic probe 1 is corrected again. The blind area distances of the ultrasonic probes 1 of different models and different manufacturers are different, the ultrasonic probes 1 matched with the instrument need to be subjected to one-time probe blind area self-scanning before the instrument is put into use for the first time, and blind area parameters of the probe under each driving power are recorded into an instrument memory for calling during measurement. For example, under a certain power driving, after the ultrasonic probe 1 emits a beam of ultrasonic pulse, as shown in fig. 3, since the mechanical vibration of the ultrasonic probe 1 has a certain "tailing" characteristic, after the driving pulse is finished, a damping vibration with a certain time is generated, and after the damping vibration is received by the receiving circuit, the echo identification of near-field detection is affected, so that the ultrasonic detection has a "blind area", which means that, as shown by the blind area waveform 5 in fig. 5, the vibration gradually decays to zero after a period of time, the position just reaching the zero point begins to be the beginning of the effective identification interval of the probe, which is the original ranging starting position 6, until the occurrence of the target reflected wave 7, the time of the blind area is the flight time t2 from the ultrasonic probe 1 to the target object, and the distance from the probe to the target object is the same as the known timeV is ultrasonic in the airThe velocity in the gas is about 340 m/s.
When the liquid level needs to be measured through the well lid small hole 4, because the well lid small hole 4 and the thicker thickness of the well lid can generate near field reflection on the ultrasonic wave radiated by the ultrasonic probe 1, the superposition of the reflected wave and the blind zone waveform 5 can generate the blind zone waveform 8 after the well lid is superposed as shown in fig. 4, and the position where the blind zone waveform 8 after the well lid is superposed is attenuated to the zero point can be prolonged backwards compared with the original ranging starting position 6 from fig. 6, so that the liquid level needs to be measured through the well lid normally, the working condition needs to be corrected again, the ranging starting position 9 after correction is obtained, and the result can be measured reliably and stably.
Fig. 7 shows a blind area data comparison of the self-scanning acquisition of the ultrasonic probe 1 under the two conditions of non-overlapping well covers and overlapping well covers, and the blind area distance is increased after the well covers are overlapped.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The rapid inspection well liquid level measurement method is characterized by comprising the following steps of:
correcting a probe blind area: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid;
a liquid level measuring step: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level.
2. The rapid inspection well liquid level measurement method according to claim 1, wherein the probe blind area correction step comprises:
step S1: setting an ultrasonic ranging sensor at a small hole of the well lid, and setting the transmitting power of the ultrasonic ranging sensor to be the lowest level;
step S2: sending out ultrasonic pulse by an ultrasonic ranging sensor, receiving echo in a specified time under the power, and continuously and digitally quantizing the echo into digital quantity data of echo amplitude;
step S3: comparing the echo data point by point with a threshold value, taking the last data smaller than the threshold value in the echo data as a dead zone critical point under the transmitting power, recording the position of the data and storing the position;
step S4: and (3) increasing the transmitting power of the ultrasonic ranging sensor by one step, repeatedly executing the steps S2-S3 until the blind area critical point corresponding to the maximum transmitting power is recorded, returning the power of the ultrasonic ranging sensor to zero, and ending the correction.
3. The rapid inspection well level measurement method of claim 1, wherein the level measurement step comprises:
step A1: an ultrasonic ranging sensor penetrates through a small hole of a well lid and emits ultrasonic pulses, the ultrasonic ranging sensor immediately turns into a receiving state after the emission is finished, and echo data with set duration are received and digitally quantized;
step A2: acquiring a blind area critical point under the transmitting power, as effective starting time for calculating echo time, resetting echo data before the effective starting time point, and demodulating updated echo data to obtain a peak value position;
step A3: and (3) judging the size of the peak value, if the peak value is smaller than a preset value, increasing the transmitting power of the ultrasonic ranging sensor, returning to the step (A1), and if the peak value is larger than the preset value, carrying out liquid level measurement according to the peak value position.
4. A rapid inspection well level measurement method according to claim 3, wherein the ultrasonic pulse is reflected back to the ultrasonic ranging sensor from the effective start timeThe time of adding the dead zone is the flight time t2 of the ultrasonic probe to the target object for one time, so that the distance from the ultrasonic ranging sensor to the liquid levelV is the speed of ultrasound in air.
5. The rapid inspection well level measurement method of claim 1, wherein the probe blind zone correction step is performed when the ultrasonic ranging sensor is first used or replaced.
6. A rapid inspection well level measurement system, comprising:
probe blind area correction module: gradually adjusting ultrasonic transmitting power within the power range of the ultrasonic ranging sensor, taking the last data smaller than a threshold value in echo data as a blind area critical point, measuring the blind area critical point of the ultrasonic ranging sensor under different transmitting powers, and storing; the ultrasonic ranging sensor is positioned at the small hole of the well lid;
a liquid level measurement module: and acquiring a corresponding blind area critical point according to the transmission power selected during measurement, wherein the blind area critical point is used as a ranging starting point, and calculating the liquid level height according to the transmission time of ultrasonic waves between the blind area critical point and the liquid level.
7. The rapid inspection well level measurement system of claim 6, wherein the probe blind zone correction module comprises:
module M1: setting an ultrasonic ranging sensor at a small hole of the well lid, and setting the transmitting power of the ultrasonic ranging sensor to be the lowest level;
module M2: sending out ultrasonic pulse by an ultrasonic ranging sensor, receiving echo in a specified time under the power, and continuously and digitally quantizing the echo into digital quantity data of echo amplitude;
module M3: comparing the echo data point by point with a threshold value, taking the last data smaller than the threshold value in the echo data as a dead zone critical point under the transmitting power, recording the position of the data and storing the position;
module M4: and (3) increasing the transmitting power of the ultrasonic ranging sensor by one step, repeatedly entering the modules M2-M3 until the blind area critical point corresponding to the maximum transmitting power is recorded, returning the power of the ultrasonic ranging sensor to zero, and ending correction.
8. The rapid inspection well level measurement system of claim 6, wherein the level measurement module comprises:
module A1: an ultrasonic ranging sensor penetrates through a small hole of a well lid and emits ultrasonic pulses, the ultrasonic ranging sensor immediately turns into a receiving state after the emission is finished, and echo data with set duration are received and digitally quantized;
module A2: acquiring a blind area critical point under the transmitting power, as effective starting time for calculating echo time, resetting echo data before the effective starting time point, and demodulating updated echo data to obtain a peak value position;
module A3: and (3) judging the size of the peak value, if the peak value is smaller than a preset value, increasing the transmitting power of the ultrasonic ranging sensor, returning to the step (A1), and if the peak value is larger than the preset value, carrying out liquid level measurement according to the peak value position.
9. The rapid inspection well level measurement system of claim 8, wherein the time from the effective start time to the time of the ultrasonic pulse reflected back to the ultrasonic ranging sensor plus the dead zone time is the time of flight t2 of the ultrasonic probe to the target object once back and forth, the distance of the ultrasonic ranging sensor to the levelV is the speed of ultrasound in air.
10. The rapid inspection well level measurement system of claim 6, wherein the probe blind zone correction module is executed when the ultrasonic ranging sensor is first used or replaced.
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| CN202310871326.0A CN116858339A (en) | 2023-07-14 | 2023-07-14 | Quick inspection well liquid level measurement method and system |
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