CN105784067A - Transducer matching testing method and system for shortening measurement dead zone of ultrasonic level meter - Google Patents
Transducer matching testing method and system for shortening measurement dead zone of ultrasonic level meter Download PDFInfo
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- CN105784067A CN105784067A CN201510888022.0A CN201510888022A CN105784067A CN 105784067 A CN105784067 A CN 105784067A CN 201510888022 A CN201510888022 A CN 201510888022A CN 105784067 A CN105784067 A CN 105784067A
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- transducer
- level meter
- ultrasonic level
- quality factor
- blind area
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention relates to a transducer matching testing method and system for shortening the measurement dead zone of an ultrasonic level meter. The testing method comprises the steps of 1, detecting a mechanical vibration quality factor of a current transducer; 2, judging whether the mechanical vibration quality factor of the current transducer is within a preset quality factor range or not, if yes, ending the process, otherwise, judging that the current transducer is an unqualified transducer, and returning to step 1 for detection of a next transducer. The testing system comprises a testing instrument, a testing platform and one or more transducers; the mechanical vibration quality factor of the transducer on the testing platform is measured through the testing instrument, so that whether the transducer can be mounted on the ultrasonic level meter or not is judged through the measured value. According to the transducer matching testing method and system, the quality factor value of the measured transducer is judged at set frequency, so that the purpose of further shortening the measurement dead zone of the ultrasonic level meter is achieved.
Description
Technical field
The present invention relates to ultrasonic material level meter field, be specifically related to a kind of transducer matching test method and system shortening ultrasonic level meter blind area.
Background technology
In recent years, along with the development of science and technology, level gauging occupies increasingly consequence in the life of work, agricultural production and people.Wherein, the most frequently used a kind of article position measuring method is to utilize ultrasonic material level meter to carry out non-contact detecting, compared with additive method, ultrasonic material level meter has simple in construction, easy for installation, real-time is good, to adverse circumstances strong adaptability, the advantages such as the impact being susceptible to light, dust, smog and electromagnetic interference, have played the effect that can not be substituted in increasing field.
When measuring thing position, ultrasound wave launched by ultrasonic transducer, and sound wave is received by this transducer again after body surface reflects, and can calculate the sensor distance to testee surface by the time between measuring acoustic emission and receiving.Ultrasonic transducer is the critical component of ultrasonic material level meter, the electrical power of input can either convert mechanical output (ultrasound wave) to, can convert the mechanical output received to electrical power again.Ultrasonic material level meter is to be measured by the principle of hyperacoustic transmitting reflection receivable, also for this reason that, cannot measuring in a segment distance (such as 100mm) of distance ultrasonic emitting end face, this ultimate range that cannot measure just is called dead band.
In ultrasonic material level meter, blind area is the performance indications of one most critical, how to shorten the technical barrier that blind area Shi Ge great level meter producer all suffers from.By improving the mode of secondary meter Measurement Resolution, it is possible to shortening blind area, but the method expense is big, cost is high, and has reached substantially to the limit.
Summary of the invention
The technical problem to be solved is to provide a kind of transducer matching test method shortening ultrasonic level meter blind area and test system.
The technical scheme is that
A kind of transducer matching test method shortening ultrasonic level meter blind area, including:
Step S01, detects the mechanical vibration quality factor of current transducer；
Step S02, it is judged that whether the mechanical vibration quality factor of described current transducer, within the scope of preset factor, if so, then terminate, otherwise judges that described current transducer is defective transducer, and returns step S01 and carry out the detection of next transducer.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the quality factor scope of described transducer is 1500 to 2000.
Further, the frequency range of set test instrunment is 100KHz-500KHz.
Present invention also offers a kind of transducer matching test system shortening ultrasonic level meter blind area, including:
Test instrunment, test platform and at least one transducer；
The end of probe of described test instrunment is connected with described test platform；
Described test platform, can its two ends be connected with transducer to be measured, for detecting the mechanical vibration quality factor of described transducer, judge be installed on ultrasonic level meter with this.
On the basis of technique scheme, the present invention can also do following improvement.
Further, described test instrunment is electric impedance analyzer or LCR tester or vector network analyzer.
Further, the quality factor scope of described transducer is 1500 to 2000.
Further, the frequency range of described test instrunment is 100KHz-500KHz.
Further, set up defences electrostatic layer in described test platform upper berth.
The invention has the beneficial effects as follows: by the figure of merit value of measurement transducer direct under setpoint frequency, and select figure of merit value transducer to be within the specific limits arranged on level meter, further shorten the blind area of level meter, and composite measurement performance is best.
Accompanying drawing explanation
Fig. 1 is transducer matching test method flow diagram of the present invention.
Fig. 2 is the schematic diagram of transducer matching test system of the present invention
Detailed description of the invention
Level meter sends driving pulse, if its start time is t1, finish time is t2；The remained shock of driving pulse, if its start time is t2, finish time is t3；Sound wave runs into the reception pulse that barrier reflects, if its due in is t3, finish time is t4.Then level gauging result (L) is
Wherein fc is the aerial spread speed of ultrasound wave.
When tested distance is less than the L in formula (1), reflection receivable pulse is superimposed with driving pulse remained shock, it is impossible to tell the true due in (t3) of reflection receivable pulse, so also just cannot measure tested distance value.Therefore, the L in formula (1) is exactly the blind area of level meter.
Since the blind area of level meter was determined by the driving pulse remained shock persistent period (t3-t2), then reduction driving pulse remained shock persistent period (t3-t2) can be passed through and shorten blind area.
By transducer vibrations characteristic it can be seen that what the driving pulse remained shock persistent period was mainly determined by transducer mechanical vibration quality factor (Q-value).The energy attenuation of the more high expression vibrational system of Q-value is more little, and the remained shock persistent period is more long, and level meter blind area is also more long.Therefore blind area can effectively be shortened by Proper Match transducer Q-value.In conjunction with actual verification, as 1500 < Q < 2000, level meter dead band is minimum and composite measurement best results.
Below in conjunction with accompanying drawing, principles of the invention and feature being described, example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
Fig. 1 is the flow chart of transducer matching test method of the present invention.
As it is shown in figure 1, a kind of transducer matching test method shortening ultrasonic level meter blind area, comprise the steps:
Step S01, detects the mechanical vibration quality factor of current transducer；
Step S02, it is judged that whether the mechanical vibration quality factor of described current transducer, within the scope of preset factor, if so, then terminate, otherwise judges that described current transducer is defective transducer, and returns step S01 and carry out the detection of next transducer.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the quality factor scope of described transducer is 1500 to 2000.
Further, the frequency range of set test instrunment is 100KHz-500KHz.
Fig. 2 is the schematic diagram of transducer matching test system of the present invention.
Present invention also offers a kind of transducer matching test system shortening ultrasonic level meter blind area, in order to implement above-mentioned transducer matching test method.All descriptions in above-mentioned transducer matching test method are all suitable in the transducer matching test system of the present invention.
Native system includes test instrunment, test platform and at least one transducer；The end of probe of described test instrunment is connected with described test platform；Described test platform, can its two ends be connected with transducer to be measured, for detecting the mechanical vibration quality factor of described transducer, judge be installed on ultrasonic level meter with this.
On the basis of technique scheme, the present invention can also do following improvement: further, and described test instrunment is electric impedance analyzer or LCR tester or vector network analyzer.Further, the quality factor scope of described transducer is 1500 to 2000.Further, the frequency range of described test instrunment is 100KHz-500KHz.Further, set up defences electrostatic layer in described test platform upper berth.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. the transducer matching test method shortening ultrasonic level meter blind area, it is characterised in that including:
Step S01, detects the mechanical vibration quality factor of current transducer；
Step S02, it is judged that whether the mechanical vibration quality factor of described current transducer, within the scope of preset factor, if so, then terminate, otherwise judges that described current transducer is defective transducer, and returns step S01 and carry out the detection of next transducer.
2. a kind of transducer matching test method shortening ultrasonic level meter blind area according to claim 1, it is characterised in that the quality factor scope of described transducer is 1500 to 2000.
3. a kind of transducer matching test method shortening ultrasonic level meter blind area according to claim 1, it is characterised in that the frequency range of set test instrunment is 100KHz-500KHz.
4. the transducer matching test system shortening ultrasonic level meter blind area, it is characterised in that including:
Test instrunment, test platform and at least one transducer；
The end of probe of described test instrunment is connected with described test platform；
Described test platform, can its two ends be connected with transducer to be measured, for detecting the mechanical vibration quality factor of described transducer, judge be installed on ultrasonic level meter with this.
5. a kind of transducer matching test system shortening ultrasonic level meter blind area according to claim 4, it is characterised in that described test instrunment is electric impedance analyzer or LCR tester or vector network analyzer.
6. a kind of transducer matching test system shortening ultrasonic level meter blind area according to claim 4, it is characterised in that the quality factor scope of described transducer is 1500 to 2000.
7. a kind of transducer matching test system shortening ultrasonic level meter blind area according to claim 4, it is characterised in that the frequency range of described test instrunment is 100KHz-500KHz.
8. a kind of transducer matching test system shortening ultrasonic level meter blind area according to claim 4, it is characterised in that set up defences electrostatic layer in described test platform upper berth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510888022.0A CN105784067A (en) | 2015-12-04 | 2015-12-04 | Transducer matching testing method and system for shortening measurement dead zone of ultrasonic level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510888022.0A CN105784067A (en) | 2015-12-04 | 2015-12-04 | Transducer matching testing method and system for shortening measurement dead zone of ultrasonic level meter |
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| CN105784067A true CN105784067A (en) | 2016-07-20 |
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| CN201510888022.0A Pending CN105784067A (en) | 2015-12-04 | 2015-12-04 | Transducer matching testing method and system for shortening measurement dead zone of ultrasonic level meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114509136A (en) * | 2022-04-21 | 2022-05-17 | 青岛鼎信通讯股份有限公司 | Ultrasonic water meter transducer consistency test method and test system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5965800A (en) * | 1996-10-04 | 1999-10-12 | Rosemount Inc | Method of calibrating an ultrasonic flow meter |
| CN102749108A (en) * | 2012-07-11 | 2012-10-24 | 浙江大学 | Method for reducing working blind zone of ultrasonic transducer on the basis of excitation energy control |
| CN102749109A (en) * | 2012-07-11 | 2012-10-24 | 浙江大学 | Aftershock energy control-based method for reducing working blind areas of ultrasonic energy transducer |
-
2015
- 2015-12-04 CN CN201510888022.0A patent/CN105784067A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5965800A (en) * | 1996-10-04 | 1999-10-12 | Rosemount Inc | Method of calibrating an ultrasonic flow meter |
| CN102749108A (en) * | 2012-07-11 | 2012-10-24 | 浙江大学 | Method for reducing working blind zone of ultrasonic transducer on the basis of excitation energy control |
| CN102749109A (en) * | 2012-07-11 | 2012-10-24 | 浙江大学 | Aftershock energy control-based method for reducing working blind areas of ultrasonic energy transducer |
Non-Patent Citations (4)
| Title |
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| 刘灿军: "《实用传感器》", 30 June 2004 * |
| 刘赟 等: ""一种基于超声测距技术的超声液位仪设计"", 《传感器与微系统》 * |
| 国营二六五厂: "《一九七六年 全国超声检测技术交流会报告摘要》", 31 March 1978 * |
| 徐前微: "《传感技术》", 30 June 1997 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114509136A (en) * | 2022-04-21 | 2022-05-17 | 青岛鼎信通讯股份有限公司 | Ultrasonic water meter transducer consistency test method and test system |
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Application publication date: 20160720 |
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