CN102944288A - Ultrasonic liquid level meter with multi-range adaptive function - Google Patents
Ultrasonic liquid level meter with multi-range adaptive function Download PDFInfo
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- CN102944288A CN102944288A CN2012104356232A CN201210435623A CN102944288A CN 102944288 A CN102944288 A CN 102944288A CN 2012104356232 A CN2012104356232 A CN 2012104356232A CN 201210435623 A CN201210435623 A CN 201210435623A CN 102944288 A CN102944288 A CN 102944288A
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Abstract
The invention relates to an ultrasonic liquid level meter with a multi-range adaptive function. The ultrasonic liquid level meter comprises a single chip module, an ultrasonic emission module, an ultrasonic energy converter and an AD (Analog Digital) conversion module which are connected, wherein the single chip module emits a certain frequency pulse through IO (Input Output) port scanning to control the ultrasonic emission module to generate a high-voltage ultrasonic excitation signal for exciting the ultrasonic energy converter to emit an ultrasonic wave; an ultrasonic echo signal is converted into an electric signal through the ultrasonic energy converter; the amplitude of the echo signal is measured through the AD conversion module and transmitted to the single chip module; and the single chip module calculates a pulse frequency corresponding to the maximum signal amplitude and determines the pulse frequency as an ultrasonic emission frequency, so that the multi-range adaptive function of the ultrasonic liquid level meter is achieved. According to the ultrasonic liquid level meter, the ultrasonic emission frequency is guaranteed to be the same as the resonance frequency of the energy converter, the same program can automatically identify and adapt to the multi-range ultrasonic energy converter, the batch production and the interchange of the ultrasonic energy converter are facilitated, and the energy converter is more conveniently replaced when an instrument is subjected to field debugging.
Description
Technical field
The present invention relates to ultrasonic level gage, relate in particular to a kind of ultrasonic level gage with multirange adaptation function.
Background technology
Current ultrasonic level gage mostly adopts sets ultrasound wave emission receive frequency, to adapt to ultrasonic transducer, realizes the fixedly level gauging of range.This simple system needs according to the supersonic transducer frequency of selecting when production, by button ultrasound wave emission receive frequency is set, and perhaps adopts the software of programming different frequency to realize.This method, complicated operation is unfavorable for batch production, is unfavorable for the exchange of circuit and transducer, is unfavorable for field adjustable replacing transducer.Above-mentioned some be insoluble problem all the time in the ultrasonic level gage product.
Summary of the invention
Deficiency in view of the prior art existence, the object of the invention provides a kind of design proposal with ultrasonic level gage of multirange adaptation function, the supersonic liquid level meter systems can be measured the resonance frequency of ultrasonic transducer voluntarily, and the ultrasound wave of automatic setting the best emission receive frequency, automatically adapt to the ultrasonic transducer of different ranges.
For achieving the above object, the present invention realizes by such technical scheme: the ultrasonic level gage with multirange adaptation function, it is characterized in that: by one-chip computer module, the ultrasound wave transmitter module, ultrasonic transducer and AD modular converter connect and compose, one-chip computer module is by the pulse of IO mouth scanning emission certain frequency, control ultrasound wave transmitter module produces high pressure ultrasonic exciting signal, send ultrasonic signal by the excitation ultrasonic transducer, the ultrasonic echo signal is converted to electric signal by ultrasonic transducer, measure the echoed signal amplitude by the AD modular converter, and send one-chip computer module to, calculate pulsed frequency corresponding to signal amplitude maximal value by one-chip computer module, it is defined as the ultrasound wave transmission frequency, realize ultrasonic level gage multirange adaptation function, its implementation procedure is:
The minimum transmission frequency f of single-chip microcomputer initialization
0With highest frequency f
1, it is f that transmission frequency is arranged f
0, then the emission ultrasonic signal measures the ultrasonic echo signal amplitude, deposits amplitude in array a[i], transmission frequency f is increased 0.2kHz, judge that whether transmission frequency f is greater than highest frequency f
1If be not more than f
1, then continue the emission ultrasonic signal, measure the ultrasonic echo amplitude, deposit amplitude in array a[i], transmission frequency f is increased 0.2k, until transmission frequency f is greater than highest frequency f
1, then search array a[i] and middle maximum amplitude, determine that the maximum amplitude respective frequencies is transmission frequency.
The invention has the beneficial effects as follows: have the multirange adaptation function the supersonic liquid level meter systems this can automatically test the resonance frequency of ultrasonic transducer, guarantee that hyperacoustic transmission frequency is consistent with the transducer resonance frequency, make same program can identify voluntarily and adapt to the ultrasonic transducer of multiple range, be beneficial to the batch production of ultrasonic level gage and the exchange of ultrasonic transducer, and it is more convenient to change transducer during the field adjustable instrument.
Description of drawings
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is software flowing chart are of the present invention;
Fig. 3 is application example circuit diagram of the present invention;
Fig. 4 is application example algorithm flow chart of the present invention.
Embodiment
For a more clear understanding of the present invention, describe in conjunction with the accompanying drawings and embodiments the present invention in detail:
As shown in Figure 1, ultrasonic level gage with multirange adaptation function is comprised of one-chip computer module, ultrasound wave transmitter module, ultrasonic transducer and AD modular converter, wherein one-chip computer module is launched certain frequency pulsed drive ultrasound wave transmitter module, the excitation ultrasonic transducer sends ultrasonic signal, the AD modular converter is measured the ultrasonic echo signal, and pass to one-chip computer module, calculated the resonance frequency of ultrasonic transducer by single-chip microcomputer, it is defined as the ultrasound wave transmission frequency, realizes ultrasonic level gage multirange adaptation function.
Figure 2 shows that software flowing chart are of the present invention, the minimum transmission frequency f of single-chip microcomputer initialization
0With highest frequency f
1, it is f that transmission frequency is arranged f
0, then the emission ultrasonic signal measures the ultrasonic echo signal amplitude, deposits amplitude in array a[i], transmission frequency f is increased 0.2kHz, judge that whether transmission frequency f is greater than highest frequency f
1If be not more than f
1, then continue the emission ultrasonic signal, measure the ultrasonic echo amplitude, deposit amplitude in array a[i], transmission frequency f is increased 0.2k, until transmission frequency f is greater than highest frequency f
1, then search array a[i] and middle maximum amplitude, determine that the maximum amplitude respective frequencies is transmission frequency.
This algorithm begins to launch ultrasonic signal from minimum transmission frequency, and synchronous recording echoed signal amplitude, each emission stepping 0.2kHz, until high emission frequency, utilize transmit characteristics with the resonance frequency phase synchronous signal maximum of ultrasonic transducer of ultrasound wave, corresponding frequency was decided to be the standard emission frequency when echo is maximum, thereby had realized the self-adaptation of different range ultrasonic transducers.
Figure 3 shows that the present invention's one application example circuit diagram, the one-chip computer module master chip adopts the MSP430F149 chip, this chip adopts the 3.3V power voltage supply, major clock can reach 8MHz, and having the AD translation function, single-chip microcomputer is sent into the ultrasound wave transmitter module by the pulse of IO mouth emission certain frequency; The ultrasound wave transmitter module is the pulse of 15V by triode 2N3906 with the pulses switch of 3.3V, then control the on off state of field effect transistor IRFZ34, the driving transformer coil produces the high pressure pumping signal of 1000Vpp, and encourages ultrasonic transducer with this signal; Ultrasonic transducer produces ultrasound wave by the high pressure pumping signal, and the ultrasonic echo signal is converted to electric signal sends into the AD modular converter; The AD modular converter is isolated signal by operational amplifier MAX4332 chip, by diode 1N4148 detection, the peak-peak of ultrasonic signal is latched on the electric capacity, and it is sent into one-chip computer module carry out the AD conversion.
Fig. 4 is the present invention's one application example algorithm flow chart, the minimum transmission frequency f of single-chip microcomputer initialization
0Be 20kHz and highest frequency f
1Be 60kHz, it is f that transmission frequency is arranged f
0, then the emission ultrasonic signal calls the AD transfer function, by the AD conversion, measures the ultrasonic echo signal amplitude, deposits amplitude in array a[i], transmission frequency f is increased 0.2kHz, judge that whether transmission frequency f is greater than highest frequency f
1If be not more than f
1, then continue the emission ultrasonic signal, measure the ultrasonic echo amplitude, deposit amplitude in array a[i], transmission frequency f is increased 0.2k, until transmission frequency f is greater than highest frequency f
1, then by sequencer program, search array a[i] and middle maximum amplitude, the maximum amplitude respective frequencies is set as transmission frequency.Thereby finished in 20kHz to the 60kHz band limits self-adaptation of ultrasound wave transmission frequency.This section algorithm can be applied to multiple range ultrasonic level gage in 20kHz to the 60kHz scope.
According to the above description, can realize the solution of the present invention in conjunction with art technology.
Claims (2)
1. the ultrasonic level gage that has the multirange adaptation function, it is characterized in that: by one-chip computer module, the ultrasound wave transmitter module, ultrasonic transducer and AD modular converter connect and compose, one-chip computer module is by the pulse of IO mouth scanning emission certain frequency, control ultrasound wave transmitter module produces high pressure ultrasonic exciting signal, send ultrasonic signal by the excitation ultrasonic transducer, the ultrasonic echo signal is converted to electric signal by ultrasonic transducer, measure the echoed signal amplitude by the AD modular converter, and send one-chip computer module to, calculate pulsed frequency corresponding to signal amplitude maximal value by one-chip computer module, it is defined as the ultrasound wave transmission frequency, realize ultrasonic level gage multirange adaptation function, its implementation procedure is:
The minimum transmission frequency f of single-chip microcomputer initialization
0With highest frequency f
1, it is f that transmission frequency is arranged f
0, then the emission ultrasonic signal measures the ultrasonic echo signal amplitude, deposits amplitude in array a[i], transmission frequency f is increased 0.2kHz, judge that whether transmission frequency f is greater than highest frequency f
1If be not more than f
1, then continue the emission ultrasonic signal, measure the ultrasonic echo amplitude, deposit amplitude in array a[i], transmission frequency f is increased 0.2k, until transmission frequency f is greater than highest frequency f
1, then search array a[i] and middle maximum amplitude, determine that the maximum amplitude respective frequencies is transmission frequency.
2. the ultrasonic level gage with multirange adaptation function as claimed in claim 1 is characterized in that: the master chip employing MSP430F149 chip of described one-chip computer module; The ultrasound wave transmitter module is made of triode 2N3906, field effect transistor IRFZ34, transformer and Resistor-Capacitor Unit; The AD modular converter is made of operational amplifier MAX4332, diode 1N4148 and Resistor-Capacitor Unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210435623.2A CN102944288B (en) | 2012-11-05 | 2012-11-05 | Ultrasonic liquid level meter with multi-range adaptive function |
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| CN201210435623.2A CN102944288B (en) | 2012-11-05 | 2012-11-05 | Ultrasonic liquid level meter with multi-range adaptive function |
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| CN102944288A true CN102944288A (en) | 2013-02-27 |
| CN102944288B CN102944288B (en) | 2014-07-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764369A (en) * | 2016-08-23 | 2018-03-06 | 北京清控人居环境研究院有限公司 | Ultrasonic Liquid Level Measurement |
| CN108168653A (en) * | 2017-12-13 | 2018-06-15 | 太原理工大学 | The ultrasonic level monitoring device of transducer impedance Adaptive matching |
| 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 |
| CN110801144A (en) * | 2018-08-06 | 2020-02-18 | 佛山市顺德区美的电热电器制造有限公司 | Control method and system of cooking device and cooking device |
Citations (4)
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| US4142414A (en) * | 1977-10-06 | 1979-03-06 | Renal Systems, Inc. | Ultrasonic flow meter |
| CN201698023U (en) * | 2010-06-30 | 2011-01-05 | 南京信息工程大学 | Frequency-conversion ultrasonic ranging device |
| CN201837420U (en) * | 2010-04-30 | 2011-05-18 | 重庆理工大学 | Device for precisely measuring ultrasonic wave transmission time |
| 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 |
-
2012
- 2012-11-05 CN CN201210435623.2A patent/CN102944288B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4142414A (en) * | 1977-10-06 | 1979-03-06 | Renal Systems, Inc. | Ultrasonic flow meter |
| CN201837420U (en) * | 2010-04-30 | 2011-05-18 | 重庆理工大学 | Device for precisely measuring ultrasonic wave transmission time |
| CN201698023U (en) * | 2010-06-30 | 2011-01-05 | 南京信息工程大学 | Frequency-conversion ultrasonic ranging device |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764369A (en) * | 2016-08-23 | 2018-03-06 | 北京清控人居环境研究院有限公司 | Ultrasonic Liquid Level Measurement |
| CN107764369B (en) * | 2016-08-23 | 2019-11-19 | 北京清控人居环境研究院有限公司 | Ultrasonic Liquid Level Measurement |
| CN108168653A (en) * | 2017-12-13 | 2018-06-15 | 太原理工大学 | The ultrasonic level monitoring device of transducer impedance Adaptive matching |
| CN110801144A (en) * | 2018-08-06 | 2020-02-18 | 佛山市顺德区美的电热电器制造有限公司 | Control method and system of cooking device and cooking device |
| 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 |
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|---|---|
| CN102944288B (en) | 2014-07-30 |
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