CN203274862U - Radar liquid-level-gauge on-line calibrating device - Google Patents
Radar liquid-level-gauge on-line calibrating device Download PDFInfo
- Publication number
- CN203274862U CN203274862U CN 201320305791 CN201320305791U CN203274862U CN 203274862 U CN203274862 U CN 203274862U CN 201320305791 CN201320305791 CN 201320305791 CN 201320305791 U CN201320305791 U CN 201320305791U CN 203274862 U CN203274862 U CN 203274862U
- Authority
- CN
- China
- Prior art keywords
- liquid level
- level gauge
- radar
- gauge
- radar level
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model relates to a radar liquid-level-gauge on-line calibrating device. At present, radar liquid level gauges are tested and calibrated basically in a manual measuring method; as for the manual measuring method, operation is complex, data accuracy is not enough, and the calibrating effect is not obvious. The radar liquid-level-gauge on-line calibrating device comprises a laser ranging standard device, a radar liquid level gauge and a wave guide tube. The wave guide tube comprises a main tube and an auxiliary tube, wherein the main tube and the auxiliary tube are arranged side by side. A liquid level standard value is obtained by detecting a reflecting disk in the auxiliary tube of the wave guide tube through the laser ranging standard device, a liquid level detection value is obtained by detecting the liquid surface through the radar liquid level gauge, a calibrating result is obtained by comparing the liquid level standard value and the liquid level detection value, and therefore on-line calibration of the radar liquid level gauge is achieved. The radar liquid-level-gauge on-line calibrating device is convenient to operate, high in data accuracy, and obvious in calibrating effect.
Description
Technical field
The utility model belongs to the test technique automatic field, relates to a kind of radar level gauge in-line calibration device.
Background technology
Large-scale storage tank especially stores liquefied natural gas (LNG), liquefied petroleum gas (LPG), alcohol, hydrocarbon or other liquid, is all basically to detect their liquid level with radar level gauge.Now, along with passage of time, the measuring error of a lot of radar level gauges is also increasing, for whole weight and detection system is, such error will produce a lot of benefits and lose.Therefore, active demand is a kind of can in-line calibration and the method and apparatus of REAL-TIME SELF large-scale oil storage tank radar level gauge.
Summary of the invention
The utility model provides a kind of radar level gauge in-line calibration device for the technical deficiency of existing apparatus.
Radar level gauge in-line calibration device comprises laser ranging standard set-up, radar level gauge and waveguide pipe.Described waveguide pipe comprises supervisor and the looped pipeline that is arranged side by side, supervisor all opens and is interconnected with the two ends of looped pipeline, wherein radar level gauge is arranged on the upper open end of supervisor, is being provided with reference surface between the open end on radar level gauge and supervisor, and supervisor stretches in the liquid of fluid reservoir lower open end; On looped pipeline, the open end is provided with oblique catoptron, under looped pipeline, the open end is stretched in the liquid of fluid reservoir, also be provided with the reflecting disc that floats on liquid in looped pipeline, the laser ranging standard set-up is over against the catoptron setting, its shoot laser enters in looped pipeline after mirror reflects, laser in looped pipeline is vertical with the plane at reflecting disc place, and described laser ranging standard set-up and radar level gauge all are connected with the host computer signal.
Be horizontally disposed with the polylith reference plate in described supervisor, the length of reference plate in pipe from top to bottom increases progressively successively.
The beneficial effects of the utility model: at present, the calibrating of radar level gauge and calibration, the hand gauging method that all substantially adopts, this method, complicated operation, the data precision is inadequate, the calibration DeGrain.After adopting in-line calibration device described in the utility model, can obviously find, easy to operate, the data precision is high, the calibration successful.Be very beneficial for that society is convenient and swift, cost-effective development trend.
Description of drawings
The sectional view of the storage tank that Fig. 1 designs according to demand and in-line calibration device;
The vertical view of Fig. 2 waveguide pipe;
Fig. 3 a utilizes the laser ranging caliberating device when being slack tank;
Fig. 3 b is the partial enlarged drawing in 3a figure;
The block scheme of Fig. 4 in-line calibration system;
The block scheme of Fig. 5 REAL-TIME SELF system;
Fig. 6 in-line calibration process flow diagram;
Fig. 7 demarcates process flow diagram;
Fig. 8 REAL-TIME SELF process flow diagram.
Embodiment
The utility model has been introduced a kind of large-scale storage tank radar level gauge in-line calibration device.
the brief introduction of in-line calibration method, by the laser ranging standard set-up, the reflecting disc in the waveguide pipe looped pipeline is detected, obtain the liquid level standard value, radar level gauge is to level detection, obtain the liquid level detected value, liquid level standard value and liquid level detected value are compared, obtain verification result, realize the radar level gauge in-line calibration with this, the brief introduction of REAL-TIME SELF method, at first, the method is utilized the laser ranging caliberating device, position to all reference plates in the waveguide pipe supervisor is demarcated, with the calibration value of resulting each reference plate as standard value, and be stored in system, then, utilize radar level gauge, reception is from the ELECTROMAGNETIC REFLECTION ripple signal of liquid level and one or more reference plates, and utilize this reflection wave signal to calculate the detected value of liquid level and one or more reference plates, next step, detected value and their standard values separately of one or more reference plates are compared, obtain ratio correction coefficient correct between detected value and standard value, detected value based on correct ratio correction factor and liquid level obtains correct level value at last.
The device brief introduction, this device comprises a kind of laser ranging standard set-up, laser ranging caliberating device and detections of radar device.The laser ranging standard set-up comprises a transmitter, receiver and a controller and corresponding mechanical structure device, it can arrive reflecting disc with Laser emission by transmitter, and by receiver with the laser pick-off that is reflected back, and utilize controller to calculate corresponding reflecting disc distance, calculate liquid level standard value and storage; The laser ranging caliberating device comprises a transmitter, receiver and a controller and corresponding mechanical structure device, it can by transmitter with Laser emission to each reference plate, and by receiver with the laser pick-off that is reflected back on each reference plate, and utilize controller to calculate corresponding reference plate distance, store as gauged distance; Radar level gauge comprises a transmitter, receiver and a controller and corresponding mechanical structure device, it can be launched electromagnetic wave by transmitter, and will receive from the electromagnetic wave that liquid level and corresponding reference plate reflect by receiver, calculate the detection distance of liquid level and corresponding reference plate by controller.
SYSTEM SUMMARY, this system comprise that a storage tank that can store liquid, one can provide one or more reference plates and device, laser ranging standard set-up, laser ranging caliberating device, radar level gauge and the host computer of reflecting disc in storage tank.System is divided into in-line calibration module and REAL-TIME SELF module, detect the reflecting disc that is arranged in the waveguide pipe looped pipeline by the laser ranging standard set-up, draw the liquid level standard value, by transmission line to host computer, detect level value by liquid level gauge again, be uploaded to equally host computer, host computer obtains verification result by calculating; Each reference plate that detects in the waveguide pipe supervisor by the laser ranging caliberating device obtains its corresponding standard value, be stored in host computer, the detected value of each reference plate that itself and liquid level gauge are detected is compared and is obtained correction factor, obtains correct actual liquid level value based on correction factor and liquid level gauge liquid level detected value at last.
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
What Fig. 1 described is a sectional view that has the liquid storage tank system 100 of detection and liquid level detection.Liquid storage tank system 100 have one can storage of liquids 104 fluid reservoir 102.Liquid 104 evaporation and the gas 106 that produces is full of the fluid reservoir 102 on liquid level.In-line calibration and self-calibrating device 108 are arranged on fluid reservoir 102, and whole device is vertically by fluid reservoir 102.Laser ranging standard set-up 124 is arranged on fluid reservoir 102 according to specific height level, makes laser energy inject in looped pipeline 120 by the catoptron 118 in waveguide pipe looped pipeline 120.
In-line calibration and self-calibrating device 108 comprise waveguide pipe supervisor 112 and looped pipeline 120, and they are to extend to certain assigned address of fluid reservoir 102 bottoms from fixed reference face 116.The bottom of waveguide pipe supervisor 112 and looped pipeline 120 is perforates, is communicated with between them, and is also perforate in the pipeline centre, is in order to guarantee that ducted liquid level is consistent with liquid level in tank body.Waveguide pipe supervisor 112 and looped pipeline 120 are to utilize welding or other modes by specific port, are fixed on tank body 102.Therefore, reference surface 116 will be fixed on specific, a known height.
The liquid level that radar level gauge 110 and laser ranging standard set-up 124 can detect and the information exchange of reference pointer are crossed transmission line 126 and are sent to distal displayed device 128 or upper computer control system 130.In distal displayed device 128, can obtain the information of actual liquid level.In upper computer control system 130, can utilize the liquid level information of radar level gauge 110 and laser ranging standard set-up 124, radar level gauge 110 is carried out in-line calibration; Also can utilize the information of liquid level and reference pointer in radar level gauge 110, by calculating correction factor, radar level gauge 110 be carried out REAL-TIME SELF.
Due to the difficulty of large oil tank radar level gauge in-line calibration, only has at present the hand gauging method, so radar level gauge is carried out the in-line calibration active demand.The in-line calibration device that waveguide pipe looped pipeline 120, catoptron 118 and the reflecting disc 122 that the utility model is designed and laser ranging standard set-up 124 form can solve the difficulty of radar level gauge in-line calibration.
Shown in Figure 2 is the waveguide pipe schematic diagram, and wherein looped pipeline 120 is used for carrying out in-line calibration.Shown in Fig. 1, laser ranging standard set-up 124 is placed in the position of appointment, can horizontal irradiation to catoptron 118, laser reflection is entered in looped pipeline 120, thereby the position of reflecting disc 122 can be detected, finally determine the standard value of liquid level.Wherein catoptron 118 must be at 45 ° with surface level, guarantees that with this laser can enter looped pipeline 120 smoothly, and laser is parallel with tube wall.Reflecting disc 122 is made into the pan of applying looped pipeline 120 shapes, has certain thickness, can not overturn when the liquid level oscilaltion to guarantee it, and can reflector laser with bubble through the water column certain altitude.
The liquid level information exchange that laser ranging standard set-up 124 can obtain detection is crossed transmission line 126 to upper computer control system 130 or remote transmitting display 128, in upper computer control system 130, can detect the liquid level information that obtains with radar level gauge and compare, thereby liquid level gauge is carried out in-line calibration.
Because steam 106 can be full of fluid reservoir 102 and also can be full of steam in supervisor 112 the insides, because the variation of steam can affect the speed that radar wave is propagated in air, detect thereby affected normal liquid level.In addition, also have many physical features values can have influence on the detection performance of radar wave, such as, the ingredient of liquid, the temperature of the temperature of liquid or tank body 102.
In order to eliminate steam 106 to the impact of radar wave, 5 reference plates different in size to be inserted in supervisor 112, they are respectively 114a, 114b, 114c, 114d, 114e.What show in Fig. 2 is supervisor 112 and the top cross-sectional view of looped pipeline 120 in Fig. 1.Shown that reference plate 114a extends along diametric(al), and in Fig. 1, shown 114a-114e is parallel.
Fig. 3 shows utilizes the position of 300 couples of reference plate 114a-114e of laser ranging caliberating device to demarcate when being slack tank, obtains each reference plate standard value.Before installation radar level gauge 110 works, the laser ranging caliberating device is installed on fixed reference face 116.Laser ranging caliberating device 300 comprises laser range finder 302, Mobile base 304 and mounting disc 306.At first utilize securing member to be fixed on reference surface 116 mounting disc 306, then Mobile base 304 is correctly placed by shifting chute, at last laser range finder 302 is inserted in Mobile base 304.In partial view I in Fig. 3, can see that Mobile base 302 has one and shows lattice, it is fixed in Mobile base both sides, and the laser that center and laser range finder 302 send is on same surface level.Have corresponding sign scale in the both sides of mounting disc 306, what it was represented is the 8th reference plate of 1-, and as described in above the present embodiment, 1-the 5th lattice are corresponding 114a-114e respectively.The meaning of its representative is which lattice Mobile base is moved to, and laser is just got on corresponding reference plate so, is convenient to like this reference plate is demarcated.
In the utility model, the received echoed signal of radar level gauge 110 has comprised reference plate position and the liquid level position on liquid level, the signal of the reference plate in echo is compared with the initial resulting reference plate standard value of laser ranging caliberating device 300, obtain correction factor, this correction factor representative be exactly that steam 106 or tank body temperature and other environmental change are on the impact of radar wave performance.Based on this correction factor, the echoed signal that represents liquid level is revised, thereby obtained the actual value of liquid level under the existence conditions, radar level gauge 110 has been carried out REAL-TIME SELF.
Although above-mentioned is all radar level gauge, equally can be applicable to the electromagnetic wave liquid level gauge of other types.In addition, selecting of above-mentioned reference plate can be selected according to actual conditions its number.
Fig. 4 is the block scheme of in-line calibration system, and system comprises a upper computer control system, radar level gauge, laser ranging standard set-up and communication/display device.At first, upper computer control system sends one to radar level gauge and reads liquid level signal, so radar level gauge will be made corresponding feedback.The waveform generator of radar level gauge can produce a signal, and signal amplifies by amplifier, and can distinguish by circulator or other equipment that transmits and receives channel and connect antenna system.Antenna system can change into signal the electromagnetic wave emission, and it also can receive the ELECTROMAGNETIC REFLECTION ripple of liquid level or reference plate, is comprising the object information that Electromagnetic Wave Detection arrives inside reflection wave.Echoed signal will enter in receiver by circulator, and receiver converts echoed signal to signal that signal processor can be processed.Signal processor will extract the liquid level information in the middle of echoed signal, then select teletransmission show or upload upper computer control system, and the utility model will be uploaded upper computer control system by communication apparatus.Secondly, upper computer control system sends one to the laser ranging standard set-up equally and reads liquid level signal.The laser generator of laser ranging standard set-up can produce a laser signal, amplification through multiplier tube, by transmitter to target detection thing Emission Lasers, after the object reflection, receiver will receive reflected signal, the process receiver converts to and can be the signal of signal processor processes, and then signal processor from reflected signal, extracts liquid level information.What this liquid level information represented is the position of reflecting disc 122, because it and real liquid level have certain difference in height, so it will be revised in upper computer control system.
Fig. 5 is the block scheme of radar level gauge REAL-TIME SELF system, and system comprises a upper computer control system, radar level gauge, laser ranging caliberating device and communication/display device.At first upper computer control system under the init state of whole system, is sent the normal place that reads each reference plate to the laser ranging caliberating device.The laser ranging caliberating device equally transmits and receives laser with laser ranging standard set-up same as above, and obtains reference plate position accurately.Different is, the laser ranging caliberating device will carry out locating tab assembly each reference plate according to actual conditions, the normal place of each reference plate that obtains and be sent to the upper computer control system storage.Secondly, upper computer control system in certain gap periods, sends a signal that reads liquid level and each reference plate position to radar level gauge in normal operation.Radar level gauge will be with equally transmitting and receiving electromagnetic wave signal in online verification system, and different is that signal processor will not only obtain liquid level information in this echoed signal, and will extract the positional information of each reference plate.
Fig. 6 is the in-line calibration process flow diagram.This flow process is in normal operation, radar level gauge is carried out a flow process of in-line calibration.
The first step, upper computer control system will be sent the calibrating order to laser ranging standard set-up and radar level gauge.Second step, the laser ranging standard set-up detects the position of emission dish, and its signal is delivered to host computer, then upper computer control system will according to actual reflecting disc and liquid level be poor and the reference position of laser ranging standard set-up, resulting data are revised, obtained the actual liquid level value of standard.On the other hand, radar level gauge is uploaded to host computer with detected level value.Control system will be compared to actual liquid level value and the measured level value of liquid level gauge afterwards, obtain the error of indication.Next, will judge whether the error of indication exceeds standard setting, if exceed, to calibrate liquid level gauge, can calibrate it by the above-mentioned REAL-TIME SELF mode of the utility model, perhaps because the internal functionality fault can send factory to reprocess, calibration is examined and determine this point later again.If do not exceed, to calibrating point number of times judge whether reached the calibrating number that requires, if do not have, the calibrating number adds one, then, and to examining and determine down.When reaching desired number, finish whole verification process, and generate probation redport.
Fig. 7 demarcates process flow diagram, and this flow process is the flow process of a witness mark plate standard value doing before the storage tank life's work.
At first, upper computer control system sends a reading out data order to the laser ranging caliberating device.Then, the laser ranging caliberating device moves to corresponding grid according to the number of the reference plate that will measure, afterwards, detects the distance of corresponding reference plate and laser calibration device reference field and is uploaded to upper computer control system.Afterwards, according to data obtained above, the distance based between laser calibration device reference field and reference surface 116 calculates the distance between reference plate and reference surface.The reference plate normal data that obtains is stored in system, when waiting back to carry out self calibration to liquid level gauge, will be applied.Afterwards, will judge that reference plate detects number and whether reaches desired quantity, such as, reference plate is 114a-114e in the utility model, have 5, so the desired quantity of reference plate is 5, only reaches this quantity and just can enter end, otherwise will return to, to next reference plate Information Monitoring.
Because above-mentioned flow process be carry out in slack tank and the temperature and pressure when carrying out be normal value, so do not have steam, temperature and pressure that it is affected.Therefore the distance of resulting reference plate is that certain high accurancy and precision is arranged.
Fig. 8 is the REAL-TIME SELF process flow diagram.This flow process is to carry out in the fluid reservoir that liquid and steam are arranged, namely under normal operating conditions.
At first, upper computer control system control radar liquid level gauge emitting electromagnetic wave, and receive the echo that comprises object to be detected information.Wherein comprised the information (visible reference plate is on liquid level) of liquid level and reference plate, this echoed signal can extract the position of liquid level and reference plate.Next the peak value of echo detected, peak value has represented to be exactly those objects that cause echo.Afterwards, the meaning of peak value representative will be identified, on earth corresponding which reference plate of which peak value or liquid level.After obtaining peak value, calculate the detection distance of visible reference plate.Then, calculate the detection distance of liquid level.
In addition, select the standard of the length of reference plate, be based on also large that echo amplitude that its length produces can not be than liquid level, can not be also less than the amplitude of ground unrest.
Gauged distance based on resulting reference plate in the detection of visible reference plate distance and this flow process obtains a correction factor.Because the number of reference plate may be one or more, so the correction factor that obtains may have several, average to it this time, obtains final correction factor.
At last, the correction factor based on recording the level detection distance and calculating obtains correct level value.
Claims (2)
1. radar level gauge in-line calibration device, comprise laser ranging standard set-up, radar level gauge and waveguide pipe, it is characterized in that: described waveguide pipe comprises supervisor and the looped pipeline that is arranged side by side, supervisor all opens and is interconnected with the two ends of looped pipeline, wherein radar level gauge is arranged on the upper open end of supervisor, be provided with reference surface between the open end on radar level gauge and supervisor, supervisor stretches in the liquid of fluid reservoir lower open end; On looped pipeline, the open end is provided with oblique catoptron, under looped pipeline, the open end is stretched in the liquid of fluid reservoir, also be provided with the reflecting disc that floats on liquid in looped pipeline, the laser ranging standard set-up is over against the catoptron setting, its shoot laser enters in looped pipeline after mirror reflects, laser in looped pipeline is vertical with the plane at reflecting disc place, and described laser ranging standard set-up and radar level gauge all are connected with the host computer signal.
2. a kind of radar level gauge in-line calibration device according to claim 1 is characterized in that: be horizontally disposed with the polylith reference plate in described supervisor, the length of reference plate in pipe from top to bottom increases progressively successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320305791 CN203274862U (en) | 2013-05-30 | 2013-05-30 | Radar liquid-level-gauge on-line calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320305791 CN203274862U (en) | 2013-05-30 | 2013-05-30 | Radar liquid-level-gauge on-line calibrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203274862U true CN203274862U (en) | 2013-11-06 |
Family
ID=49505246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320305791 Expired - Fee Related CN203274862U (en) | 2013-05-30 | 2013-05-30 | Radar liquid-level-gauge on-line calibrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203274862U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292874A (en) * | 2013-05-30 | 2013-09-11 | 中国计量学院 | Method and device for online verification and realtime self-calibration of radar liquid level meter |
| CN104101406A (en) * | 2014-08-01 | 2014-10-15 | 昆山市创新科技检测仪器有限公司 | Precision automatic detecting device for liquidometer |
| CN104154971A (en) * | 2014-07-06 | 2014-11-19 | 四川泛华航空仪表电器有限公司 | Automatic detection equipment of fuel oil measuring system |
| CN105675093A (en) * | 2014-11-21 | 2016-06-15 | 中国航空工业集团公司雷华电子技术研究所 | Establishment method of experiment environment for verifying measurement accuracy of radar liquid level meter |
| TWI816238B (en) * | 2021-11-25 | 2023-09-21 | 凌波股份有限公司 | Liquid fuel capacity detection device |
-
2013
- 2013-05-30 CN CN 201320305791 patent/CN203274862U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292874A (en) * | 2013-05-30 | 2013-09-11 | 中国计量学院 | Method and device for online verification and realtime self-calibration of radar liquid level meter |
| CN103292874B (en) * | 2013-05-30 | 2015-06-24 | 中国计量学院 | Method and device for online verification and realtime self-calibration of radar liquid level meter |
| CN104154971A (en) * | 2014-07-06 | 2014-11-19 | 四川泛华航空仪表电器有限公司 | Automatic detection equipment of fuel oil measuring system |
| CN104154971B (en) * | 2014-07-06 | 2017-09-29 | 四川泛华航空仪表电器有限公司 | Fuel measuring system automatic detection system |
| CN104101406A (en) * | 2014-08-01 | 2014-10-15 | 昆山市创新科技检测仪器有限公司 | Precision automatic detecting device for liquidometer |
| CN105675093A (en) * | 2014-11-21 | 2016-06-15 | 中国航空工业集团公司雷华电子技术研究所 | Establishment method of experiment environment for verifying measurement accuracy of radar liquid level meter |
| CN105675093B (en) * | 2014-11-21 | 2019-03-29 | 中国航空工业集团公司雷华电子技术研究所 | A kind of building method for verifying radar level gauge measurement accuracy experimental situation |
| TWI816238B (en) * | 2021-11-25 | 2023-09-21 | 凌波股份有限公司 | Liquid fuel capacity detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103292874B (en) | Method and device for online verification and realtime self-calibration of radar liquid level meter | |
| CN203274862U (en) | Radar liquid-level-gauge on-line calibrating device | |
| EP2274584B1 (en) | Method and apparatus for real-time calibration of a liquid storage tank level gauge | |
| CN101464163B (en) | Straightness detecting method for platform normal point used for total station instrument check | |
| CN101297182B (en) | Level gauge | |
| CN102798434B (en) | Determine the assessment equipment of the characteristic variable of the position of border surface and method in container | |
| CN104678369A (en) | Dual-polarization weather radar calibration method based on non-fixed metal ball | |
| CN103644953B (en) | Transparent liquid level measurement method and realizing device for transparent liquid level measurement | |
| CN103076065A (en) | Laser measuring device for detecting liquid level of liquid metal | |
| CN104807512B (en) | A kind of method of ultrasonic measurement sea bottom percolation throughput | |
| CN106885617B (en) | Liquid level meter detection device and detection method thereof | |
| RU2384482C1 (en) | On-board aircraft fuel measurement system | |
| CN104797910A (en) | Time domain reflectometry aircraft fuel gauge | |
| CN108709605A (en) | Outer ultrasonic liquid level detecting system based on multiecho detection | |
| CN102392635A (en) | Underground well water level observation device | |
| CN208333626U (en) | A kind of New fluid level gauge calibrating installation | |
| CN206974511U (en) | A kind of ultrasonic water level gauge for adapting to water level fluctuation | |
| CN112097854A (en) | Laser range finder for water gauge measurement and use method | |
| CN202273672U (en) | Water level observation device for underground well | |
| CN111693109A (en) | Multifunctional storage tank liquid level meter | |
| CN108592879B (en) | Levelness measuring device and method for piston type walking parts | |
| CN107179061B (en) | A kind of self calibration ultrasound survey pin device and measurement method | |
| NO20121041A1 (en) | Method for determining the position of a detector located on the seabed | |
| CN203489945U (en) | External attaching type ultrasound liquid level meter | |
| CN104272066B (en) | For the method measuring the liquid level of liquid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131106 Termination date: 20150530 |
|
| EXPY | Termination of patent right or utility model |