CN115014461A - Liquid level measuring device and method integrating millimeter wave radar and height sensor - Google Patents
Liquid level measuring device and method integrating millimeter wave radar and height sensor Download PDFInfo
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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
- G01F23/284—Electromagnetic 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
- G01F23/14—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 measurement of pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
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Abstract
The invention provides a liquid level measuring device and a method integrating a millimeter wave radar and a height sensor, wherein the liquid level measuring device comprises a millimeter wave detection part and a height pressure sensing part, can be placed at a certain distance above a liquid level, measures the distance from the liquid to a transmitting antenna in a millimeter wave non-contact mode, and further calculates the height of the liquid level; when the liquid level rises to submerge the device under special conditions, the depth of the device in water can be measured through the height pressure sensor; adding the depth and the measured liquid level height to obtain the actual liquid level height at that time; the invention combines the millimeter wave liquid level non-contact measurement and the height pressure sensor for use, realizes the higher precision measurement of the liquid level, and avoids the measurement failure problem caused by the liquid submerging measurement device.
Description
Technical Field
The invention relates to the technical field of liquid level sensors, in particular to a liquid level measuring device and method integrating a millimeter wave radar and a height sensor.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The liquid level measurement refers to real-time monitoring of the liquid level to be measured and provides information for monitoring personnel, and the liquid level can be river water level, reservoir water level, sea water level, water storage tank water level, oil storage tank liquid level, chemical solution liquid level and the like. The application occasions range from waterlogging monitoring to large-scale oil storage tank storage capacity control and the like, are widely applied to industries such as agriculture, environment, petrochemical industry, metallurgy and the like, and are an important ring of safety detection. The currently commonly used liquid level meters include a float type liquid level meter, a differential pressure type liquid level meter, a capacitance type liquid level meter, an ultrasonic liquid level meter, a radar liquid level meter and the like.
The radar liquid level scoring is a contact type or a non-contact type, the non-contact type is an instrument for performing non-contact type liquid level measurement by means of an electromagnetic wave technology, early radars adopt a microwave frequency band, are limited by wavelength, and have low measurement precision, and in recent years, along with the development of a millimeter wave technology, the radar liquid level scoring starts to adopt a millimeter wave band. The signal mode is divided into a pulse mode and a continuous wave mode, and the current continuous frequency modulated wave (FMCW) signal mode is the main signal mode. Under the signal modulation mode, the device has the advantages of wide bandwidth, high frequency and small transmitting power, so the testing precision is high and can reach +/-0.7 mm at most, and domestic products are +/-3 mm at most. Therefore, a millimeter wave FMCW radar level gauge is an ideal device for achieving high precision level measurement.
The inventor finds that the millimeter wave liquid level meter is aimed at non-contact measurement at present, and lacks a prejudgment method for a liquid level inundation instrument and a method for solving the consequences.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a liquid level measuring device and method fusing a millimeter wave radar and a height sensor, which are combined with the combined use of millimeter wave liquid level non-contact measurement and a height pressure sensor, realize higher precision measurement of liquid level and solve the measurement problem after liquid level sudden expansion under extreme conditions.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a liquid level measuring device integrating a millimeter wave radar and a height sensor.
A liquid level measuring device integrating a millimeter wave radar and a height sensor, comprising: the control terminal controls the opening and closing of the millimeter wave radar and the height sensor, and the current liquid level is obtained according to the measurement result of the millimeter wave radar and/or the height sensor.
Further, the radio frequency unit of the millimeter wave radar comprises a microstrip antenna and a lens, wherein the microstrip antenna is used for transmitting signals, and the lens is used for signal focusing and collimation.
Furthermore, a preset gap is reserved between the lens and the microstrip antenna.
Further, the lens is a hyperboloid lens.
Furthermore, the lens is made of Teflon plastic.
Furthermore, the height sensor is arranged in the shell and is lower than the lens by a preset distance, and the windowing of the shell is used as a liquid inlet window of the height sensor.
Further, the height sensor is a height pressure sensor.
Furthermore, the control terminal is communicated with an external control terminal through a 5G communication module.
The second aspect of the present invention provides a measuring method using a liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor, comprising the steps of:
the control terminal controls the millimeter wave radar to be started to obtain a first distance from the transmitting antenna to the liquid level, and a current first liquid level is obtained according to the first distance and a second distance from the transmitting antenna to the bottommost part of the liquid;
when the liquid level rises to a preset distance from a lens of the millimeter wave radar, the control terminal controls the millimeter wave radar to stop working;
and the control terminal controls the height sensor to be started, obtains a third distance from the current liquid level to the liquid level measuring device according to the value of the height sensor, and obtains a current second liquid level according to the first liquid level and the third distance.
Further, when the lens is at a fourth distance centimeter from the liquid level, the height sensor starts to enter the liquid, and the liquid level depth is tested in real time;
the current liquid level depth data is temporarily stored in the control terminal, refreshing of a preset time interval is kept, at the moment, data of millimeter wave test, which change at every preset time interval, are compared with data of the height pressure sensor, which change at every preset time interval, and a difference value is calculated;
according to the rising condition of the liquid level, judging the number of times of height refreshing between the fourth distance and the fifth distance, storing the difference value of each time, and taking the average value of the difference values measured for multiple times in the height between the fourth distance and the fifth distance;
when the first liquid level is smaller than or equal to the fifth distance, the millimeter wave radar stops working, current data are stored, and the height pressure sensor continuously refreshes test data;
and adding the measured value of the millimeter wave radar to the measured value of the height sensor, and adding the average value to the measured value to be used as the final liquid level value of the current test.
Compared with the prior art, the invention has the beneficial effects that:
1. the liquid level measuring device and method integrating the millimeter wave radar and the height sensor are combined with the millimeter wave liquid level non-contact measurement and the height pressure sensor for use, so that the liquid level is measured with higher precision, and the problem of measurement failure caused by the liquid submerging measuring device is solved.
2. According to the invention, the number of times of height refreshing between the fourth distance and the fifth distance is judged according to the rising condition of the liquid level, the difference value of each time is stored, the average value of the difference values measured for multiple times in the height between the fourth distance and the fifth distance is taken, the average value is added into the final liquid level, the fusion of two measurement modes is effectively realized, and the measurement error is greatly reduced.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of a liquid level measuring device incorporating a millimeter wave radar and a height sensor according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a lens design according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of signal flow according to an embodiment of the present invention.
1. A control terminal; 2. a radio frequency unit; 3. a microstrip antenna; 4. a lens; 5. a display screen; 6. a 5G communication module; 7. a 5G antenna; 8. a power supply cable; 9. a battery; 10. a height sensor; 11. an alarm; 12. a housing.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
the embodiment 1 of the present invention provides a liquid level measuring device integrating a millimeter wave radar and a height sensor, including: the liquid level measuring device comprises a control terminal 1 and a millimeter wave radar and height sensor 10 communicated with the control terminal, wherein the control terminal 1 controls the millimeter wave radar and the height sensor to be turned on and off, and the current liquid level is obtained according to the measurement result of the millimeter wave radar and/or the height sensor.
Specifically, as shown in fig. 1, the liquid level measuring device includes: radio frequency unit 2, microstrip antenna 3, lens 4, display screen 5, 5G communication module 6, 5G antenna 7, power supply cable 8, battery 9, height sensor 10, alarm 11 and housing 12.
The single chip microcomputer is used as the control terminal 1, and the modes of work and low power consumption waiting can be set. Meanwhile, the millimeter wave signals are controlled to be transmitted and received, the bandwidth, the period and the like of the transmitted signals can be set, data transmission is carried out with the 5G communication module 6, and data of the height pressure sensor are received. After the control terminal 1 processes the received signals, the signals are forwarded through a 5G communication network, the operation can be carried out at a computer end or a mobile phone end, the remote checking and monitoring are realized, the data volume is small, the flow is not wasted, and the communication cost is low.
The radio frequency unit provides 120GHz or 77GHz millimeter wave continuous frequency modulated wave (FMCW), and the corresponding antenna part adopts a lens integrated antenna suitable for 120GHz or 77GHz, and the antenna is formed by the following steps: the microstrip antenna transmits signals, the lens plays roles in signal focusing and collimation, the divergence angle of the lens is less than or equal to 3 degrees, the gain is greater than or equal to 34db, a gap is reserved between the lens and the microstrip antenna, the distance between the lens and the microstrip antenna is 6-20mm, and the lens and the microstrip antenna play a role in air coupling so as to realize impedance matching of the lens and the microstrip antenna and reduce reflection.
The lens design adopts a hyperboloid design, the design follows Abbe sine constraint conditions, the adopted formula and the schematic diagram are shown in FIG. 2, and the specific calculation formula is as follows:
y＝F e ·sin(θ)
r+n·[(y-r·sin(θ)) 2 +(x-r·cos(θ)) 1/2 ]-x＝(n-1)·T
the hyperboloid lens described in this embodiment can realize higher gain and great signal receiving face, and the material adopts teflon (PTFE) plastics.
The height sensor 10 is a height pressure sensor and is arranged in a metal shell, a window is formed as a liquid inlet window of the sensor, when the liquid level approaches to a lens, millimeter wave distance measurement is limited by the fact that the bandwidth cannot be distinguished within the distance of 0-2.5cm, the height pressure sensor can be switched to work, the pressure sensor can convert the induced pressure into current to be output, the depth of the current equipment in the liquid is calculated according to the characteristics of the tested liquid, the current equipment is displayed through the display screen 5, or an alarm 11 gives an alarm.
In this embodiment, the battery 9 may be a lithium battery, or may be powered by an external power source, for example, 220V in a power transmission line. After the device starts to work, the control terminal 1 controls the radio frequency unit to generate 78G or 120G continuous frequency modulation waves in a continuous frequency modulation wave (FMCW) mode, the signal bandwidth is 5G, the resolution of 2.5cm can be achieved, the precision can reach +/-0.7 mm, meanwhile, the altitude pressure sensor is kept in a working state, and the current pressure value caused by the atmosphere is tested.
The signal is output by the lens and collimated, meet a liquid interface part and is reflected, this part of signal is received by the same lens aerial, the signal is compared with original signal in the radio frequency unit, produce the intermediate frequency signal of a single frequency (difference frequency signal), utilize the frequency of this intermediate frequency signal can calculate the measured distance, its computational formula is:
where R denotes the measured distance, c is the speed of light, f IF Is the intermediate frequency, B is the bandwidth, and T is the signal period. The intermediate frequency signal is processed and forwarded by the control terminal, on one hand, real-time and on-site display can be carried out through the display screen, on the other hand, the intermediate frequency signal can be sent to a computer end in a communication network by utilizing the 5G communication moduleOr a mobile phone end, thereby realizing wireless and remote viewing and control.
When the liquid level rises to 3cm from the lens, millimeter wave test operation stops, and control terminal control radio frequency unit stop work, preserves current liquid level height to start height pressure sensor work, height pressure sensor is the embedding on the shell that surrounds lens, and apart from lens surface 5cm, height pressure sensor measures its pressure according to the characteristic of liquid level, and converts the voltage value into and transmits singlechip control end, control terminal according to the formula:
h Height ＝p pressure of /ρ Density of g Gravity force
And calculating the liquid depth, and adding the liquid depth and the height of the water level of the millimeter wave test to calculate the final water level. When the liquid submerges the testing device, the brightness of the display screen is increased, the current liquid level is displayed in real time, and an alarm sound is given out.
The height pressure sensor is used for representing height by voltage, a miniature pressure sensor can be adopted, the sensor outputs a voltage value corresponding to the height to the single chip microcomputer, the single chip microcomputer detects the voltage value and converts the voltage value into a height value, and the height value is added with a height value measured by a millimeter wave signal to obtain the final water level height.
When the liquid level measuring device is submerged, the current liquid level is displayed through the sound wave alarm and the lightening display screen because the electromagnetic wave signals in the water cannot be transmitted.
The data fusion mode of the millimeter wave test and the height pressure sensor test is as follows:
the millimeter wave test height is distance h1 between the antenna and the liquid level, the liquid level height h3 is calculated to be h2-h1 according to the known distance h2 at the bottom of a river channel or other scenes, the test precision is in millimeter level, and when the detected liquid level h1 is not more than 3cm, the current liquid level height h3 is stored.
The height pressure sensor is 5cm away from the outside of the lens, namely when the lens is 5cm away from the liquid level, the height pressure sensor starts to enter liquid, the liquid level depth is tested in real time, the current liquid level depth data is temporarily stored in the control terminal and kept refreshed once within 1s, the data of millimeter wave test which changes every 1s is compared with the data of 1s change in the height pressure sensor at the moment, the difference is calculated, the refreshing times of 2cm height between 5cm and 3cm are judged according to the rising condition of the liquid level, the difference at each time is stored, and the average value delta h of the difference measured for multiple times in the 2cm height is taken;
when the liquid level h1 is less than or equal to 3cm, the millimeter wave test channel stops working, the current data is stored, the height pressure sensor continuously refreshes the test data, the millimeter wave measured value is added with the height pressure sensor measured value, and the average value delta h is added to be used as the final value of the current test, namely the height of the liquid level.
It can be understood that, in this embodiment, specific distance values such as 3cm and 5cm, and specific time values such as 1s, may be selectively set by a person skilled in the art according to specific working conditions, and are not described herein again.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a fuse millimeter wave radar and height sensor's liquid level measurement device which characterized in that:
the method comprises the following steps: the control terminal controls the opening and closing of the millimeter wave radar and the height sensor, and obtains the current liquid level according to the measurement result of the millimeter wave radar and/or the height sensor.
2. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 1, wherein:
the radio frequency unit of the millimeter wave radar comprises a microstrip antenna and a lens, wherein the microstrip antenna is used for transmitting signals, and the lens is used for focusing and collimating the signals.
3. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 2, wherein:
a preset gap is reserved between the lens and the microstrip antenna.
4. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 2, wherein:
the lens is a hyperboloid lens.
5. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 2, wherein:
the lens is made of Teflon plastic.
6. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 1, wherein:
the height sensor is arranged in the shell and is lower than the lens by a preset distance, and the window of the shell is used as a liquid inlet window of the height sensor.
7. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 1, wherein:
the height sensor is a height pressure sensor.
8. The liquid level measuring apparatus incorporating a millimeter wave radar and a height sensor according to claim 1, wherein:
and the control terminal is communicated with an external control terminal through a 5G communication module.
9. A liquid level measurement method fusing a millimeter wave radar and a height sensor is characterized in that: use of a liquid level measuring device according to any of claims 1-8, comprising the following process:
the control terminal controls the millimeter wave radar to be started to obtain a first distance from the transmitting antenna to the liquid level, and a current first liquid level is obtained according to the first distance and a second distance from the transmitting antenna to the bottommost part of the liquid;
when the liquid level rises to a preset distance away from a lens of the millimeter wave radar, the control terminal controls the millimeter wave radar to stop working;
and the control terminal controls the height sensor to be started, obtains a third distance from the current liquid level to the liquid level measuring device according to the value of the height sensor, and obtains a current second liquid level according to the first liquid level and the third distance.
10. The liquid level measuring method incorporating the millimeter wave radar and the height sensor according to claim 9, wherein:
when the lens is at a fourth distance centimeter from the liquid level, the height sensor starts to enter the liquid, and the liquid level depth is tested in real time;
the current liquid level depth data is temporarily stored in the control terminal, refreshing of a preset time interval is kept, at the moment, data of millimeter wave test, which change at every preset time interval, are compared with data of the height pressure sensor, which change at every preset time interval, and a difference value is calculated;
according to the rising condition of the liquid level, judging the number of times of height refreshing between the fourth distance and the fifth distance, storing the difference value every time, and taking the average value of the difference values measured for multiple times in the height between the fourth distance and the fifth distance;
when the first liquid level is smaller than or equal to the fifth distance, the millimeter wave radar stops working, current data are stored, and the height pressure sensor continuously refreshes test data;
and adding the measured value of the millimeter wave radar to the measured value of the height sensor, and adding the average value to the measured value to be used as the final liquid level value of the current test.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116124248A (en) * | 2023-02-08 | 2023-05-16 | 武汉新烽光电股份有限公司 | Device and method for measuring water level of drainage pipe network |
| WO2024088643A1 (en) * | 2022-10-26 | 2024-05-02 | Endress+Hauser SE+Co. KG | Spatially resolving filling level measurement |
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