CN219391056U - Flange type aviation oil mass measuring device based on ultrasonic wave - Google Patents
Flange type aviation oil mass measuring device based on ultrasonic wave Download PDFInfo
- Publication number
- CN219391056U CN219391056U CN202320850882.5U CN202320850882U CN219391056U CN 219391056 U CN219391056 U CN 219391056U CN 202320850882 U CN202320850882 U CN 202320850882U CN 219391056 U CN219391056 U CN 219391056U
- Authority
- CN
- China
- Prior art keywords
- measuring
- ultrasonic
- flange
- inner tube
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a flange type aviation oil quantity measuring device based on ultrasonic waves, which belongs to the field of measuring instruments, wherein a circuit board is arranged in a box body of a flange type controller box, and the flange type controller box is arranged on the outer side of the top of an oil tank through a flange structure; the measuring inner tube is sleeved in the measuring outer tube, a cavity is formed between the measuring inner tube and the measuring outer tube, the tops of the measuring inner tube and the measuring outer tube are arranged on the inner side of the top of the oil tank through a flange structure of the flange type controller box, and the bottoms of the measuring inner tube and the measuring outer tube extend to the bottom of the oil tank; the ultrasonic sensor is arranged at the bottom in the tube of the inner tube, the ultrasonic wave emitting direction of the ultrasonic sensor is upward, and the signal wire of the ultrasonic sensor is electrically connected with the circuit board. Through the technical scheme of the utility model, the oil quantity in the aircraft oil tank can be accurately, stably and reliably measured, and the device has the advantages of simple structure, convenience in installation, low maintenance cost, high measurement precision, strong anti-interference capability and the like.
Description
Technical Field
The utility model relates to the technical field of measuring instruments, in particular to a flange type aviation oil quantity measuring device based on ultrasonic waves.
Background
Although the current liquid level measuring method is more, the practical liquid level measuring method is rarely applied due to the limitation of aviation use conditions. In recent years, the liquid level detection technology is rapidly improved due to the development of microelectronic technology and the application of new detection principles, and a plurality of new measurement methods and principles are presented. According to the measurement principle, the method can be classified into an ultrasonic measurement method, an optical fiber measurement method, a magnetostriction measurement method and a radar measurement method. Various methods have advantages and disadvantages, wherein ultrasonic measurement technology is considered to be one of the potential aviation liquid level measurement methods due to the characteristics of excellent performance, low price, convenient use and the like.
The ultrasonic relative optical fiber liquid level method has the following advantages:
1. the fuel is insensitive to color and illuminance, and the influence of opaque substances in the fuel can be avoided;
2. ultrasonic waves are insensitive to electromagnetic fields, and can be used in environments with complex electromagnetic field intensity.
The ultrasonic relative magnetostriction measurement method has the characteristics of simple mechanical mechanism, low cost and easy realization of miniaturization and integration of the sensor. Compared with the radar which is the sensor internationally optimal for ranging, the ultrasonic measuring method has the characteristics of no electromagnetic interference, simple and easy signal detection and processing, simple system, low cost, convenience for installation, good stability and the like.
However, there are also some problems with existing ultrasonic systems:
firstly, a flange plate is required to be installed on the top of the oil tank in an opening way, so that the integrity and the tightness of the oil tank are damaged;
secondly, a coupling agent or a gasket is required to be filled between the probe and the inner pipe wall so as to ensure good acoustic matching, but the materials can age or fall off along with time to influence the signal quality;
thirdly, a certain distance or angle deviation exists between the probe and the inner pipe wall, so that signals are attenuated or reflected;
fourthly, the probe needs to bear the severe environmental influences such as high temperature, high pressure, strong corrosion and the like;
fifthly, the ultrasonic measurement method has the defects of measurement blind areas, difficult detection of inclined liquid level and the like, and cannot cope with accurate measurement of dynamic inclined liquid level under aviation use conditions.
Disclosure of Invention
Aiming at the problems, the utility model provides the flange type aviation oil quantity measuring device based on ultrasonic waves, which can accurately, stably and reliably measure the oil quantity in an aircraft oil tank and has the advantages of simple structure, convenience in installation, low maintenance cost, high measuring precision, strong anti-interference capability and the like.
In order to achieve the above object, the present utility model provides an ultrasonic-based flange type aviation fuel quantity measuring device, which is applied to measuring fuel quantity in a fuel tank of an aircraft, and comprises: the device comprises a flange type controller box, a circuit board, a measuring inner tube, a measuring outer tube and an ultrasonic sensor;
the circuit board is arranged in the box body of the flange type controller box, and the flange type controller box is arranged on the outer side of the top of the oil tank through a flange structure;
the measuring inner tube is sleeved in the measuring outer tube, a cavity is formed between the measuring inner tube and the measuring outer tube, the tops of the measuring inner tube and the measuring outer tube are arranged on the inner side of the top of the oil tank through a flange structure of the flange type controller box, and the bottoms of the measuring inner tube and the measuring outer tube extend to the bottom of the oil tank;
the ultrasonic sensor is arranged at the bottom of the inner tube of the measuring inner tube, the ultrasonic wave emitting direction of the ultrasonic sensor is upward, and the signal wire of the ultrasonic sensor is electrically connected with the circuit board.
In the above technical solution, preferably, the flange-type aviation fuel quantity measuring device based on ultrasonic wave further comprises a fuel quantity alarm, wherein the fuel quantity alarm comprises a low-level sensor and a high-level sensor, and the low-level sensor and the high-level sensor are capacitive sensors;
the low-level sensor and the high-level sensor are respectively arranged in a preset low limit and a preset high limit of a cavity between the measuring inner tube and the measuring outer tube, and are respectively electrically connected with the circuit board.
In the above technical solution, preferably, the measuring inner tube and the measuring outer tube are cylindrical tubes made of carbon fiber materials.
In the above technical solution, preferably, the ultrasonic sensor includes an integrated transducer capable of transmitting an ultrasonic signal toward the top of the tank and of receiving an echo reflected by the level of the oil level.
In the above technical solution, preferably, the circuit board includes a circuit board, a single-chip microcomputer control board, a signal processing board and a power board, the circuit board is disposed at the bottom of the flange type controller box, the circuit board, the single-chip microcomputer control board, the signal processing board and the power board are connected through socket and plug adaptation, and the power board is connected with an aviation socket fixed at the outer side of the flange type controller box;
the ultrasonic sensor, the low-level sensor and the high-level sensor are respectively and electrically connected with the circuit base plate.
In the above technical solution, preferably, signal lines of the ultrasonic sensor, the low level sensor, and the high level sensor are connected to the circuit board through a cavity between the measurement inner tube and the measurement outer tube.
In the above technical solution, preferably, the measuring inner tube is communicated with the bottom of the measuring outer tube, and a supplementary oil inlet is formed in the lower portion of the side wall of the measuring inner tube.
In the above technical solution, preferably, a sealant is encapsulated between the bottom of the circuit board and the bottom of the flange type controller box.
In the above technical scheme, preferably, the singlechip control board adopts an STM32F446 singlechip, and the signal processing board comprises a signal amplifying circuit, a band-pass filter circuit, an index amplifier and an analog-to-digital conversion circuit.
In the above technical solution, preferably, the ultrasonic sensor, the low-level sensor, and the high-level sensor are connected with the circuit board through an RS422 bus interface.
Compared with the prior art, the utility model has the beneficial effects that:
1. the flange type controller box is adopted, so that the circuit board can be conveniently arranged on the outer side of the top of the oil tank, the inner space of the oil tank is not occupied, the sealing performance of the oil tank is not influenced, and the circuit board is prevented from being influenced by oil in the oil tank;
2. the utility model adopts the carbon fiber inner and outer tubes, can effectively isolate the influence of the changes of temperature, pressure, humidity and the like in the oil tank on the ultrasonic sensor, and improves the measurement precision and stability;
3. the utility model adopts the ultrasonic sensor, can utilize the reflection principle of ultrasonic wave in air and liquid, the ultrasonic wave is emitted upwards from the bottom of the oil tank, and the height of the oil surface distance sensor in the oil tank is calculated according to the time difference between the received oil surface reflection echo and the emitted ultrasonic wave, so as to calculate the oil quantity in the oil tank, and the utility model has the advantages of high measuring speed, high precision, strong anti-interference capability and the like.
Drawings
FIG. 1 is a schematic cross-sectional view of an ultrasonic-based flange-type aviation oil mass measurement device according to an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of an inner measuring tube and an outer measuring tube according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a power supply circuit of a power panel according to an embodiment of the present utility model;
FIG. 4 is a schematic circuit diagram of a signal processing board according to an embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a control board of a single-chip microcomputer according to an embodiment of the utility model;
fig. 6 is a circuit schematic diagram of an RS422 communication module according to an embodiment of the present utility model.
In the figure, the correspondence between each component and the reference numeral is:
1. a flange type controller box; 2. a circuit board; 21. a circuit backplane; 22. a singlechip control board; 23. a signal processing board; 24. a power panel; 3. measuring the inner tube; 31. a supplementary oil inlet; 4. measuring the outer tube; 5. an ultrasonic sensor; 6. a low level sensor; 7. a high-level sensor; 8. aviation socket; 9. and an oil tank.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model is described in further detail below with reference to the attached drawing figures:
as shown in fig. 1 and 2, according to the present utility model, there is provided an ultrasonic-based flange type aviation fuel quantity measuring device, which is applied to measuring fuel quantity in a fuel tank 9 of an aircraft, and includes: the flange type controller comprises a flange type controller box 1, a circuit board 2, a measuring inner tube 3, a measuring outer tube 4 and an ultrasonic sensor 5;
the circuit board 2 is arranged in the box body of the flange type controller box 1, and the flange type controller box 1 is arranged on the outer side of the top of the oil tank 9 through a flange structure;
the measuring inner tube 3 is sleeved in the measuring outer tube 4, a cavity is formed between the measuring inner tube 3 and the measuring outer tube 4, the tops of the measuring inner tube 3 and the measuring outer tube 4 are arranged on the inner side of the top of the oil tank 9 through a flange structure of the flange type controller box 1, and the bottoms of the measuring inner tube 3 and the measuring outer tube 4 extend to the bottom of the oil tank 9;
the ultrasonic sensor 5 is installed in the intraductal bottom of measuring inner tube 3, and the ultrasonic emission direction of ultrasonic sensor 5 upwards, and the signal line and the circuit board 2 electricity of ultrasonic sensor 5 are connected.
In this embodiment, the flange type controller box 1 is adopted, so that the circuit board 2 can be conveniently installed on the outer side of the top of the oil tank 9, the inner space of the oil tank 9 is not occupied, the sealing performance of the oil tank 9 is not affected, and the circuit board 2 is prevented from being affected by oil in the oil tank 9. The ultrasonic sensor 5 is adopted, ultrasonic waves are emitted upwards from the bottom of the oil tank 9 by utilizing the propagation principle of the ultrasonic waves in air and liquid, and the height of the oil surface distance sensor in the oil tank 9 is calculated according to the time difference between the received reflected echo of the oil surface and the emitted ultrasonic waves, so that the oil mass in the oil tank 9 is calculated, and the oil mass measuring device has the advantages of high measuring speed, high precision, strong anti-interference capability and the like.
Specifically, the ultrasonic liquid level measurement is based on the characteristic that ultrasonic waves are emitted at the interface of media with different acoustic impedances, the ultrasonic waves emitted by an ultrasonic transducer are emitted at the interface of liquid and gas, the generated echoes are received by the transducer, and the liquid level height can be measured according to the time from the ultrasonic transducer to the time when the ultrasonic waves are emitted by the transducer until the ultrasonic waves are received again.
Wherein, the time between pulse transmission and reception (the movement time of ultrasonic wave) is proportional to the distance from the transducer to the object surface, and the relation between the liquid level height s and the sound velocity c and the transmission time t is: s=c×t/2, where the velocity c of the ultrasonic wave in the oil is known, the transmission time t is the time difference between the ultrasonic wave transmission and reception, and the level is calculated.
In the above embodiment, preferably, the flange-type aviation fuel gauge based on ultrasonic wave further includes a fuel alarm, the fuel alarm includes a low sensor 6 and a high sensor 7, and the low sensor 6 and the high sensor 7 are capacitive sensors;
the low-level sensor 6 and the high-level sensor 7 are respectively arranged at a preset low limit and a preset high limit of a cavity between the measuring inner tube 3 and the measuring outer tube 4, and the low-level sensor 6 and the high-level sensor 7 are respectively electrically connected with the circuit board 2.
In this embodiment, when the oil level is lower than the low sensor 6, the circuit board 2 may determine according to the change of the capacitance of the low sensor 6, and when the oil level is higher than the high sensor 7, the circuit board 2 may determine according to the change of the capacitance of the high sensor 7, so as to alert the aircraft driver when the oil level is about to reach the preset position and the preset high position.
In the above embodiment, preferably, the inner tube 3 and the outer tube 4 are cylindrical tubes made of carbon fiber, and the carbon fiber can effectively isolate the influence of the changes such as temperature, pressure, humidity and the like in the oil tank 9 on the ultrasonic sensor 5, so that the measurement accuracy and stability are improved.
In the above embodiment, it is preferable that the ultrasonic sensor 5 includes an integrated transducer capable of transmitting an ultrasonic signal in the top direction of the tank 9 and capable of receiving an echo reflected by the oil level. Specifically, unlike conventional ultrasonic liquid level detection in the air at the top of the oil tank 9, the ultrasonic sensor 5 of the present utility model is disposed at the bottom of the oil tank 9, emits ultrasonic waves from the oil to the top, and at the interface between the oil and the air, part of the ultrasonic waves continue to be emitted to the air, and part of the ultrasonic waves are reflected back to the transducer of the ultrasonic sensor 5. In the process, before the oil is exhausted, the ultrasonic wave transmitting and receiving processes are carried out in the oil, so that the interference possibly suffered by the ultrasonic wave transmitting and receiving in the air is reduced, and the measuring precision and stability are improved.
As shown in fig. 3 to 6, in the above embodiment, preferably, the circuit board 2 includes a circuit board 21, a single-chip microcomputer control board 22, a signal processing board 23 and a power board 24, the circuit board 21 is disposed at the bottom of the flange-type controller box 1, the circuit board 21, the single-chip microcomputer control board 22, the signal processing board 23 and the power board 24 are connected through socket and plug adaptation, and the power board 24 is connected with an aviation socket 8 fixed at the outer side of the flange-type controller box 1;
the ultrasonic sensor 5, the low sensor 6, and the high sensor 7 are electrically connected to the circuit board 21, respectively.
In the above embodiment, preferably, the single-chip microcomputer control board 22 adopts an STM32F446 single-chip microcomputer, and the signal processing board 23 includes a signal amplifying circuit, a band-pass filter circuit, an index amplifier and an analog-to-digital conversion circuit.
Wherein, according to the high-frequency PWM signal sent by the singlechip control panel 22, the power amplification is carried out through the signal amplification circuit, the high-precision ultrasonic transducer is driven to oscillate to generate the emission ultrasonic wave, the high-frequency pulse acoustic wave is sent by the transducer (probe), the surface of the object to be tested (oil surface) is reflected, the reflected echo turned back is received by the same transducer (probe), converted into an electric signal, amplified and filtered through the signal processing board 23, filtered to receive signal noise interference, and converted into an analog quantity signal into a digital signal through the analog-digital conversion circuit.
In the above embodiment, it is preferable that the signal lines of the ultrasonic sensor 5, the low sensor 6, and the high sensor 7 are connected to the circuit board 21 through the cavity between the measurement inner tube 3 and the measurement outer tube 4.
In the above embodiment, preferably, the measuring inner tube 3 is communicated with the bottom of the measuring outer tube 4, and the lower part of the side wall of the measuring inner tube 3 is provided with the supplementary oil inlet 31, so that the speed of oil entering and exiting the measuring inner tube 3 can be increased, and the real-time performance of the measuring result of the measuring device can be improved.
In the above embodiment, it is preferable that the bottom of the circuit board 21 and the bottom of the flange-type controller box 1 are filled with sealant therebetween to prevent the oil from overflowing onto the circuit board 2.
In the above embodiment, it is preferable that the ultrasonic sensor 5, the low-level sensor 6, and the high-level sensor 7 are connected with the circuit board 21 through the RS422 bus interface, so as to ensure the real-time performance and stability of data transmission.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. Ultrasonic-based flange-type aviation oil mass measurement device is applied to the measurement of the oil mass in the oil tank of aircraft, and is characterized in that the device comprises: the device comprises a flange type controller box, a circuit board, a measuring inner tube, a measuring outer tube and an ultrasonic sensor;
the circuit board is arranged in the box body of the flange type controller box, and the flange type controller box is arranged on the outer side of the top of the oil tank through a flange structure;
the measuring inner tube is sleeved in the measuring outer tube, a cavity is formed between the measuring inner tube and the measuring outer tube, the tops of the measuring inner tube and the measuring outer tube are arranged on the inner side of the top of the oil tank through a flange structure of the flange type controller box, and the bottoms of the measuring inner tube and the measuring outer tube extend to the bottom of the oil tank;
the ultrasonic sensor is arranged at the bottom of the inner tube of the measuring inner tube, the ultrasonic wave emitting direction of the ultrasonic sensor is upward, and the signal wire of the ultrasonic sensor is electrically connected with the circuit board.
2. The ultrasonic-based flange-type aviation oil quantity measuring device according to claim 1, further comprising an oil quantity alarm, wherein the oil quantity alarm comprises a low-level sensor and a high-level sensor, and the low-level sensor and the high-level sensor are capacitive sensors;
the low-level sensor and the high-level sensor are respectively arranged in a preset low limit and a preset high limit of a cavity between the measuring inner tube and the measuring outer tube, and are respectively electrically connected with the circuit board.
3. The ultrasonic-based flange-type aviation oil quantity measuring device according to claim 1, wherein the measuring inner pipe and the measuring outer pipe are cylindrical pipes made of carbon fiber materials.
4. The ultrasonic-based flange-type aviation fuel gauge of claim 1, wherein the ultrasonic sensor comprises an integrated transducer capable of transmitting ultrasonic signals in a top direction of the fuel tank and capable of receiving echoes reflected by the fuel level.
5. The ultrasonic-based flange type aviation oil quantity measuring device according to claim 2, wherein the circuit board comprises a circuit base plate, a single-chip microcomputer control board, a signal processing board and a power board, the circuit base plate is arranged at the bottom of the flange type controller box, the circuit base plate, the single-chip microcomputer control board, the signal processing board and the power board are connected through socket and plug adaptation, and the power board is connected with an aviation socket fixed at the outer side of the flange type controller box;
the ultrasonic sensor, the low-level sensor and the high-level sensor are respectively and electrically connected with the circuit base plate.
6. The ultrasonic-based flange-type aviation oil quantity measuring device according to claim 5, wherein signal lines of the ultrasonic sensor, the low-level sensor and the high-level sensor are connected to the circuit board through a cavity between the measuring inner tube and the measuring outer tube.
7. The ultrasonic-based flange type aviation oil quantity measuring device according to claim 1 or 6, wherein the measuring inner pipe is communicated with the bottom of the measuring outer pipe, and a supplementary oil inlet is formed in the lower portion of the side wall of the measuring inner pipe.
8. The ultrasonic-based flange-type aviation oil quantity measurement device according to claim 5, wherein a sealant is filled between the bottom of the circuit board and the bottom of the flange-type controller box.
9. The ultrasonic-based flange-type aviation oil quantity measuring device according to claim 5, wherein the single-chip microcomputer control board adopts an STM32F446 single-chip microcomputer, and the signal processing board comprises a signal amplifying circuit, a band-pass filter circuit, an index amplifier and an analog-to-digital conversion circuit.
10. The ultrasonic-based flange-type aviation oil quantity measuring device according to claim 5, wherein the ultrasonic sensor, the low-level sensor and the high-level sensor are connected with the circuit base plate through an RS422 bus interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320850882.5U CN219391056U (en) | 2023-04-17 | 2023-04-17 | Flange type aviation oil mass measuring device based on ultrasonic wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320850882.5U CN219391056U (en) | 2023-04-17 | 2023-04-17 | Flange type aviation oil mass measuring device based on ultrasonic wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219391056U true CN219391056U (en) | 2023-07-21 |
Family
ID=87187737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320850882.5U Active CN219391056U (en) | 2023-04-17 | 2023-04-17 | Flange type aviation oil mass measuring device based on ultrasonic wave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219391056U (en) |
-
2023
- 2023-04-17 CN CN202320850882.5U patent/CN219391056U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5309763A (en) | Liquid-level gauging | |
| US7843199B2 (en) | Level meter | |
| JP2001133313A (en) | Low-power radar type level gauge with intensified diagnostic function | |
| CN107167219B (en) | Self-calibration externally-attached ultrasonic liquid level switch measurement system and measurement method thereof | |
| CN105510918A (en) | Actual measurement sound velocity-based ultrasonic distance measuring method and ultrasonic sensor | |
| KR930702657A (en) | Ultrasonic apparatus and method for measuring the outer diameter of tubes | |
| CN112539805B (en) | Ultrasonic liquid level measurement system and method for sound velocity compensation by adopting DTS | |
| US6825798B2 (en) | Rod antenna with installation thread | |
| CN202815608U (en) | Water tank water-level control system | |
| CN201688893U (en) | Magnetostriction liquid level measuring instrument | |
| JPH11502031A (en) | Method and apparatus for determining the level of a liquid by ultrasonic pulses | |
| EP3183543A1 (en) | Compensated fluid level transmitter | |
| CN219391056U (en) | Flange type aviation oil mass measuring device based on ultrasonic wave | |
| CN213274472U (en) | Ultrasonic liquid level meter with inclination angle detection function | |
| CN208606861U (en) | Throw-in type intrinsic safety liquidometer | |
| CN208937143U (en) | Tank body and its contactless liquid level emasuring device | |
| CN111811612A (en) | Split type level gauge | |
| CN2206449Y (en) | Extramural ultrasonic liquid level detector | |
| CN212301880U (en) | Ultrasonic ranging system self-adaptive to environment | |
| CN220380577U (en) | Back-flushing radar level gauge | |
| JPH06249697A (en) | Ultrasonic liquid-level indicator | |
| WO2020020242A1 (en) | Wastewater flow measuring circuit and device | |
| CN210833771U (en) | Water level measuring device | |
| CN111366516A (en) | Optical high-temperature-resistant vibration-resistant particle sensor probe | |
| US20230077375A1 (en) | Device, system and method for rodless guided microwave radiation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |