CN102735314A - High-precision externally-mounted type ultrasonic liquid meter - Google Patents
High-precision externally-mounted type ultrasonic liquid meter Download PDFInfo
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- CN102735314A CN102735314A CN201110094658XA CN201110094658A CN102735314A CN 102735314 A CN102735314 A CN 102735314A CN 201110094658X A CN201110094658X A CN 201110094658XA CN 201110094658 A CN201110094658 A CN 201110094658A CN 102735314 A CN102735314 A CN 102735314A
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- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000002604 ultrasonography Methods 0.000 claims description 21
- 238000002372 labelling Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 230000000644 propagated effect Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000011900 installation process Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000016507 interphase Effects 0.000 description 1
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- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Abstract
The invention discloses a high-precision externally-mounted type ultrasonic liquid meter. An instrument is externally adhered to a center position at the bottom of a storage tank in an installation process, so that a liquid level in a tank body is metered. The instrument uses an ultrasonic echo time difference method technology, and uses an updated hardware circuit and signal analyzing method, so that the liquid level of the liquid storage tank is metered with a precision reaching to an order of 0.1 mm.
Description
Technical field:
The present invention relates to a kind of ultrasonic technology that utilizes adopts external labeling type that the accurate measurement instrument of realizing tank level is installed.
Background technology:
Current ultrasonic liquid level gauge both at home and abroad mainly contains air-borne sound and liquid sound two big classes; Wherein the air-borne sound liquid level in respect of simple installation, characteristics such as be widely used; But owing to the rising of the aerial decay of ultrasound wave meeting along with frequency increases; Because ultrasound wave is subject to disturb in air, therefore be difficult to utilize the air-borne sound liquid level gauge to realize high-precision measuring requirement simultaneously.Liquid sound liquid level gauge contact liq, sound wave is propagated in liquid, has got rid of ultrasound wave and in air, has been subject to situation about disturbing, and greatly reduces it and receives annoyance level; But because it needs contact liq, mounting process is had very big requirement, and its echo waveform variation greatly, instrument is a greater impact when carrying out signal analysis easily, and the precision of the most ultrasonic liquid level gauge that therefore can see at present is not high.And in some special application scenarios, in the oil product handing-over metering like tank wagon, because tank wagon oil plant in transportation is raise by temperature and expands, the temperature expansion coefficient of oil product is about 10
-3/ ℃; For a volume more than 20,000 liters, jar high oil tank at 1.5 meters; The every rising of temperature once all will make a jar interior liquid height that several millimeters variation is arranged, and for the purpose that can realize that oil tank is accurately measured, just need use the surveying instrument of precision in the 0.1mm magnitude.
Summary of the invention:
The purpose of this invention is to provide a kind of ultrasonic technology that utilizes adopts the external labeling type mounting means to realize jar instrument that interior liquid level is accurately measured.
The objective of the invention is to realize through following technical scheme:
At first confirm to adopt the metering system of liquid sound, both can effectively remove environmental disturbances, can carry out the optimum sound wave frequency according to concrete applied environment again and select; Guaranteeing that instrument can reach a more excellent duty, secondly is to select suitable hardware, like the processing time of processing unit; The assurance time difference method that instrument adopted calculates and can satisfy high-precision requirement; At last, also be the key component of whole work, when calculating, must guarantee can not lose ripple; Promptly to accurately find the Mintrop wave position, when conceptual design, adopt the closed control circuit realization.
The instrument that is installed in jar outer bottom produces the ultrasound wave of fixed frequency through scm managing system; Driving USERM module is removed to promote ultrasonic transducer and is sent ultrasound wave; Ultrasound wave is propagated in liquid after seeing through the steel body; On the interphase that arrives liquid-to-air, reflect, the time generation time difference the when time of the sound wave that the instrument basis receives and emission is carried out the calculating of jar interior liquid level and is measured.The Mintrop wave signal that when when calculating, guaranteeing to calculate through the adjustment of closed control circuit is echo is to improve the precision of whole measurement.Detect current sound's velocity in liquid in real time through the temperature sensor in the instrument simultaneously, carry out necessary temperature compensation correction, make the measurement of whole instrument can reach the precision of 0.1mm.
Description of drawings:
Fig. 1 is an instrument mounting means at the scene, and the bottom of jar is the sign of instrument;
Fig. 2 is that the hardware of whole invention is formed structured flowchart, and wherein the USERM module is employing section woods sound (Beijing) the science and technology limited Company standard ultrasound wave impulse transceiver module of development and production voluntarily;
Fig. 3 is the software realization flow figure of whole instrument.
Embodiment:
The ultrasonic liquid level gauge of high precision external labeling type of the present invention, its preferable embodiment is:
Aspect the selection of ultrasonic transducer, adopt Chinese Academy of Sciences's acoustics that a kind of ultrasonic transducer is provided, this transducer has good stability, very high signal to noise ratio (S/N ratio) and the impedance matching that is well suited for, and can realize the demand that we design fully.This transducer can be used for outer the subsides to be measured, and the penetration of ultrasound waves tank skin that promptly sends gets into liquid, rather than direct contact liq.So both effectively avoided of the influence of jar interior environment, simplified mounting condition again instrument.
At the driving and the receiving unit of transducer, we realize as the ultrasonic emitting receiver module with the USERM-5317B module that section's woods sound (Beijing) science and technology limited Company is developed.This module be one by pulse power radiating circuit and the signal integrated applications of ultrasound module of amplifying circuit height that accepts filter.The main integrated topping power amplification driving circuit of sonac of the pulse power radiating circuit of this module, it with after matching transformer links to each other directly drive ultrasonic transducer generation 2MHz with the ultrasound wave of lower frequency.Its output pulse power reaches as high as 300W, and output impedance is 25m Ω, and its output power is adjustable, can adapt to different application environments.The filtering of carrying out to the received signal that its receiving unit circuit mainly provides is amplified; Can be according to the filtered band and the enlargement factor of different application need adjustment receiving units; Its input noise can be low to moderate 50uV when frequency input signal is 500kHz; For receiving the faint especially application scenario of signal, be used for external labeling type like this instrument the application requirements of realizing that instrument is accurately measured is installed.
Aspect signal Processing and calculating, we have chosen C8051F360 as central intelligent processor.This processor is inner integrated A/D conversion, D/A conversion; Can satisfy the hsrdware requirements of closed-loop control; The frequency of operation of this device is 100MHz to the maximum; Being equivalent to its machine cycle is 10ns, uses the accessible measuring accuracy of this kind of single-chip microcomputer to be 10ns*1500m/s/2=0.007mm, can satisfy the resolution requirement of 0.01mm fully.
The major part of software design is launched driving square wave part exactly, is gathered echoed signal part and close-loop feedback control.Wherein transmit square waves partly is to utilize the level saltus step of I/O mouth to produce several square waves in order to drive USERM-5317B module generation transmitted wave; Convert ultrasonic emitting to via ultrasonic transducer after this transmitted wave amplifies through transformer and go out, timer picks up counting simultaneously.Be exactly the stand-by period then, wait ultrasound wave to run into liquid level and gather after reflecting.The echoed signal collecting part is that hyperacoustic echoed signal is gathered, and notes corresponding time value.
Close-loop feedback control is the emphasis in the whole software design, also is a kind of necessary means that guarantees precision.Size according to A/D acquired signal amplitude; The level of the I/O mouth through single-chip microcomputer comes attenuation degree and the size of control signal enlargement factor of control amplifier input signal; Can be not excessive or too small thereby make amplifier output signal promptly get into the signal of comparator circuit, thus close-loop feedback control formed, the method for gathering with phase place simultaneously; It is unit that the error of 1/4 wavelength of conventional acquisition method (90 degree) scope is tapered to the degree, realizes the accurate measurement of instrument.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (7)
1. an external labeling type high-precision ultrasound liquid level gauge is characterized in that, at first jar metering of interior liquid level is realized in the directly outer bottom that is affixed on storage tank of instrument.
2. realize the described external labeling type high-precision ultrasound of claim 1 liquid level gauge for one kind, it is characterized in that this instrument utilizes different frequency ranges to realize the level gauge of the storage tank of different wall, frequency coverage is from 20kHz～2MHz.
3. realize the described external labeling type high-precision ultrasound of claim 1 liquid level gauge for one kind; It is characterized in that; Ultrasound wave is initiatively launched in this instrument utilization, and ultrasound wave is propagated in liquid, is reflecting between the stratified liquid face or on the liquid-to-air branch aspect; Instrument is analyzed echoed signal, calculates the height of liquid in the storage tank according to the mistiming of echo and transmitted wave.
4. realize the described external labeling type high-precision ultrasound of claim 3 liquid level gauge for one kind, it is characterized in that the ultrasound echo signal when this instrument utilizes closed control circuit to adapt to different liquid level is automatically realized the accurate measurement of instrument.
5. realize the described external labeling type high-precision ultrasound of claim 3 liquid level gauge for one kind; It is characterized in that; This instrument utilizes phase detection method, ultrasonic echo is detected from original precision that can only 90 degree bring up to the precision in several years, has realized the accurate measurement of instrument.
6. realize the described external labeling type high-precision ultrasound of claim 3 liquid level gauge for one kind, it is characterized in that the real-time temperature survey mode of this instrument utilization realizes the real-Time Compensation of the velocity of sound, realize the high-precision measuring of instrument.
7. realize the described external labeling type high-precision ultrasound of claim 3 liquid level gauge for one kind; It is characterized in that; This instrument is accomplished reception, the signal Processing of hyperacoustic emission, echoed signal and is calculated; Data after will handling at last are through serial ports or the output of 485 interfaces, if single liquid level also can be directly through the output of 4～20mA interface mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110094658XA CN102735314A (en) | 2011-04-15 | 2011-04-15 | High-precision externally-mounted type ultrasonic liquid meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110094658XA CN102735314A (en) | 2011-04-15 | 2011-04-15 | High-precision externally-mounted type ultrasonic liquid meter |
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| CN102735314A true CN102735314A (en) | 2012-10-17 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198015A (en) * | 2014-09-05 | 2014-12-10 | 陕西声科电子科技有限公司 | Two-wire system externally-pasted-type liquid level meter |
| CN104198016A (en) * | 2014-09-10 | 2014-12-10 | 湖南三一智能控制设备有限公司 | Ultrasonic liquid level gauge and ultrasonic liquid level detecting method |
| CN103913208B (en) * | 2014-04-25 | 2017-06-16 | 西安华舜测量设备有限责任公司 | External ultrasonic liquidometer and its measuring method with velocity of sound self-calibration function |
| CN110219641A (en) * | 2019-05-27 | 2019-09-10 | 承德石油高等专科学校 | A kind of well liquid face test device and its test method |
| CN111380595A (en) * | 2020-03-29 | 2020-07-07 | 华中科技大学 | Salt cavern gas storage gas-liquid interface measuring method and system based on sound velocity difference |
| CN111397697A (en) * | 2020-04-08 | 2020-07-10 | 河海大学常州校区 | Water level ultrasonic detection method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206449Y (en) * | 1994-07-11 | 1995-08-30 | 马志敏 | Extramural ultrasonic liquid level detector |
| CN1250154A (en) * | 1999-09-30 | 2000-04-12 | 石油大学(华东) | Automatic supersonic oil tank level measurement technology based on half-wave transmission principle |
| WO2002035190A1 (en) * | 2000-10-25 | 2002-05-02 | Zhi Lu | A method for measuring liquid level in large oil tanks with ultrasonic wave |
-
2011
- 2011-04-15 CN CN201110094658XA patent/CN102735314A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206449Y (en) * | 1994-07-11 | 1995-08-30 | 马志敏 | Extramural ultrasonic liquid level detector |
| CN1250154A (en) * | 1999-09-30 | 2000-04-12 | 石油大学(华东) | Automatic supersonic oil tank level measurement technology based on half-wave transmission principle |
| WO2002035190A1 (en) * | 2000-10-25 | 2002-05-02 | Zhi Lu | A method for measuring liquid level in large oil tanks with ultrasonic wave |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913208B (en) * | 2014-04-25 | 2017-06-16 | 西安华舜测量设备有限责任公司 | External ultrasonic liquidometer and its measuring method with velocity of sound self-calibration function |
| CN104198015A (en) * | 2014-09-05 | 2014-12-10 | 陕西声科电子科技有限公司 | Two-wire system externally-pasted-type liquid level meter |
| CN104198016A (en) * | 2014-09-10 | 2014-12-10 | 湖南三一智能控制设备有限公司 | Ultrasonic liquid level gauge and ultrasonic liquid level detecting method |
| CN110219641A (en) * | 2019-05-27 | 2019-09-10 | 承德石油高等专科学校 | A kind of well liquid face test device and its test method |
| CN111380595A (en) * | 2020-03-29 | 2020-07-07 | 华中科技大学 | Salt cavern gas storage gas-liquid interface measuring method and system based on sound velocity difference |
| CN111380595B (en) * | 2020-03-29 | 2021-02-23 | 华中科技大学 | Salt cavern gas storage gas-liquid interface measuring method and system based on sound velocity difference |
| CN111397697A (en) * | 2020-04-08 | 2020-07-10 | 河海大学常州校区 | Water level ultrasonic detection method |
| CN111397697B (en) * | 2020-04-08 | 2021-09-17 | 河海大学常州校区 | Water level ultrasonic detection method |
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Application publication date: 20121017 |