CN105333911A - Low-power-consumption middle-low-pressure gas ultrasonic flow measuring circuit - Google Patents
Low-power-consumption middle-low-pressure gas ultrasonic flow measuring circuit Download PDFInfo
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- CN105333911A CN105333911A CN201510731968.6A CN201510731968A CN105333911A CN 105333911 A CN105333911 A CN 105333911A CN 201510731968 A CN201510731968 A CN 201510731968A CN 105333911 A CN105333911 A CN 105333911A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
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Abstract
The invention relates to a low-power-consumption middle-low-pressure gas ultrasonic flow measuring circuit, which comprises a first ultrasonic transducer, a second ultrasonic transducer, a first analog switch, a second analog switch, a pre-amplifier, a band-pass filtering unit, a comparing unit, a driving unit, a pressure stabilizing unit, an ultrasonic signal transceiving timing unit and a single chip microcomputer unit. The low-power-consumption middle-lower pressure gas ultrasonic flow measuring circuit has the advantages that the flow rate of gas flowing through a pipeline is calculated through measuring the direct and reverse flow propagation time difference of ultrasonic in gas; further, the gas flow velocity is obtained; through the adoption of the ultrasonic signal transceiving timing unit, the gas flow measurement precision is improved; the device cost is reduced.
Description
Technical field
The invention belongs to detection of gas flow rate technical field, relate to a kind of mesolow gas ultrasound ripple flow measurement circuit of low-power consumption.
Background technology
From the nineties in last century, since ultrasonic technology is applied to the detection field of gas flow, through the development of two more than ten years, Digital Signal Processing and sensor technology all have rapid progress in actual applications, at present, ultrasonic technology has been widely used in the measurement of liquid and high-pressure gas flow.But the problems such as decay is fast, weak output signal that ultrasonic signal exists in the measurement of mesolow gas flow, need larger enlargement factor, usually need larger drive current.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of mesolow gas ultrasound ripple flow measurement circuit of low-power consumption.
The technical scheme that technical solution problem of the present invention is taked is:
The present invention includes the first ultrasonic transducer, the second ultrasonic transducer, the first analog switch, the second analog switch, prime amplifier, bandpass filtering unit, comparing unit, driver element, voltage regulation unit, ultrasonic signal transmitting-receiving timing unit, single machine unit.
First ultrasonic transducer, the second ultrasonic transducer symmetry are installed on the both sides of conduit axis; The input end of the first transducer is connected with one end of the first analog switching circuit; The input end of the second transducer is connected with one end of the second analog switching circuit; The other end of the first analog switch is connected with the output terminal of driver element; The other end of the second analog switch is connected with the input end of prime amplifier; The output terminal of prime amplifier is connected with the input end of bandpass filtering unit; The output terminal of bandpass filtering unit is connected with the input end of comparing unit; The output terminal of comparing unit is connected with ultrasonic transmission/reception timing unit; The input end of driver element is connected with ultrasonic transmission/reception timing unit; Ultrasonic transmission/reception timing circuit is connected with single-chip microcomputer.
Described analog switch type selecting chip MAX4622; Described pre-amplifier unit type selecting chip AD620, described bandpass filtering unit type selecting chip OPA836, described comparing unit type selecting chip LMV761; Described voltage regulation unit type selecting chip TPS76930, described driver element type selecting chip LT3572; Described ultrasonic signal transmitting-receiving timing unit type selecting chip TDC-GP21; Described single-chip microcomputer type selecting chip MSP430F448.
Beneficial effect of the present invention is: the present invention is by measuring the concurrent-countercurrent propagation time difference of ultrasound wave in gas, calculate the gas flow flowing through pipeline, and then obtaining gas flow rate, the employing of TDC-GP21 chip improves the precision of gas flow measurement, saves installation cost.System adopts small signal driving ultrasonic transducer, accurately obtain the concurrent-countercurrent propagation time difference of ultrasound wave in gas by feeble signal comparator circuit, reduce voltage and the electric current of systematic survey, thus reduce power consumption, adopt powered battery, the serviceable life of a batteries is at 3-5.Be applicable to the flow measurement of the arbitrary gas in mesolow situation, in measuring process, there is no crushing, flowmeter long service life.
Accompanying drawing explanation
Fig. 1 is the scheme of installation of ultrasonic transducer;
Fig. 2 is control system theory diagram;
Fig. 3 take single-chip microcomputer as the control system physical circuit instance graph of core.
Embodiment
Further illustrate the present invention below in conjunction with accompanying drawing, the present invention proposes a kind of power down signal process metering circuit for mesolow gas flow measurement.
Gas ultrasonic flowmeter wherein adopts time difference method to measure in principle, and this is also current widely used time difference type gas ultrasonic flowmeter.The principle of work of this flowmeter is: the flow velocity of ultrasound wave in static fluid is C, and the flow velocity of fluid is V
0, the ultrasound wave following current time is in a fluid t
1, the ultrasound wave adverse current time is in a fluid t
2, the air line distance between two ultrasonic transducers is L, is θ with pipeline angle, and so the ultrasound wave following current time is in a fluid
The ultrasound wave adverse current time is in a fluid
Formula (1) and formula (2) are subtracted each other, obtains
Formula (1) and formula (2) are added, can C be obtained
(4) formula is brought in (3) formula, obtains
Gas ultrasound measuring method of the present invention is specifically: measure ultrasound wave downstream propagation times t in the gas flow
1with adverse current travel-time t
2, calculate by formula (5) gas flow rate flowing through pipeline.In formula, L is the distance between two transducers, the angle that θ is formed for the line between transducer and pipeline axis, t
1, t
2for the travel-time of ultrasound wave between two transducers.
With reference to Fig. 1, by a pair symmetrical both sides being installed on conduit axis plane of ultrasonic transducer, should note during installation making the axle center of two transducers on same straight line, the first transducer is arranged on ducts upstream, and the second transducer is arranged on pipe downstream as far as possible.
With reference to Fig. 2, this mesolow gas flow low-power consumption ultrasonic wave measurement mechanism comprises the first ultrasonic transducer, the second ultrasonic transducer, the first analog switch, the second analog switch, prime amplifier, bandpass filtering unit, comparing unit, driver element, voltage regulation unit, ultrasonic signal transmitting-receiving timing unit, single machine unit.
Described first transducer input is connected with the first end of the first analog switch, and described second transducer input is connected with the first end of the second analog switch; The described other end of the first analog switch is connected with the output pin of driver element, and the described other end of the second analog switch is connected with the input end of pre-amplifier unit; The input end of described driver element is connected with the START pin of ultrasonic transmission/reception timing circuit, FIRE pin; The output terminal of described prime amplifier is connected with the input end of bandpass filtering unit; The described output terminal of bandpass filtering unit is connected with the input end of comparing unit; The output terminal of described comparing unit is connected with one end of ultrasonic transmission/reception timing unit; The gating pin of described ultrasound wave transmission timing circuit, clock pin, data input pin, data output pin are connected with the I/O mouth of single-chip microcomputer respectively with 32K clock input pin; Described first analog switching circuit Enable Pin, the second analog switching circuit Enable Pin are connected with the I/O mouth of single-chip microcomputer respectively;
Fig. 3 is a kind of physical circuit example of mesolow gas flow low-power consumption ultrasonic wave measurement mechanism, analog switch chip type selecting MAX4622; Driver element chip type selecting LT3572; Preamplifier chip type selecting AD620; Bandpass filtering unit chip type selecting OPA836; Comparing unit chip type selecting LMV761; Ultrasonic transmission/reception timing unit chip type selecting TDC-GP21; Single machine unit chip type selecting MSP430F448.
Anode, the negative terminal of described first transducer are connected with one end of the first analog switch, one end of the second analog switch respectively; Anode, the negative terminal of described second transducer are connected with the other end of the second analog switch, the other end of the first analog switch respectively; Described first analog switch Enable Pin, the second analog switch Enable Pin are connected with the P3.5 pin of single-chip microcomputer, P3.6 pin respectively; Output terminal 18 pin, output terminal 19 pin of described driver element are connected with one end of the first analog switch; + IN the pin ,-IN pin of described second analog switch and prime amplifier are connected; The P4.2 pin of the A0 pin of described prime amplifier, A1 pin, A2 pin and single-chip microcomputer, P4.3 pin, P4.4 pin are connected; Described prime amplifier OUT end is held with bandpass filtering unit-IN and is connected; Described bandpass filtering unit OUT pin is connected with comparing unit-IN pin; Described comparing unit OUT end is connected with the STOP pin of TDC-GP21; START pin, the FIRE pin of described driver element PWM pin and TDC-GP21 are connected; The XIN pin of described chip GP21 is connected with the two ends of XOUT pin with resistance R, and the two ends of R are connected with the two ends of 4M pottery crystal oscillator, and the two ends of crystal oscillator meet electric capacity C3 and C4 respectively, the common end grounding of C3 and C4, and this is the start-oscillation circuit of GP21; The RSTN pin of described chip TDC-GP21, SO pin, SI pin, SCK pin, SSN pin, INTN pin are connected with P2.1, P2.0, P1.7, P1.6, P1.5, P1.4 pin of single-chip microcomputer MSP430F448 respectively.
After system electrification, MSP430 single-chip microcomputer completes the Initialize installation of self and TDC-GP21 chip, and then system starts the measurement carrying out gas flow.
The pulse producer FIRE port of Single-chip Controlling timing chip TDC-GP21 produces driving pulse, through over-drive unit LT3572, the first ultrasonic transducer is encouraged to produce ultrasound wave, now the first ultrasonic transducer is as transmitting transducer, second ultrasonic transducer is as receiving transducer, meanwhile the pulse producer of TDC-GP21 produces the timing module of a START unblanking chip internal, and timing starts.The ultrasonic signal that first ultrasonic transducer produces propagates into opposite through ducted gas with certain duration, second ultrasonic transducer receives ultrasonic signal, and be translated into electric signal, determine via zero passage detection the moment that signal arrives by filtering circuit, produce the timework that STOP signal stops TDC-GP21 chip, single-chip microcomputer reads this ultrasonic signal propagation time t from the register of timing chip TDC-GP21 simultaneously
1measurement data, the timing of the first transducer terminates; Equally, the FIRE port of Single-chip Controlling TDC-GP21 pulse producer produces pulse excitation, the second ultrasonic transducer is encouraged to send ultrasonic signal, switch the transmission-receiving function of two ultrasonic transducers, the second transducer can be obtained as the working time t sending signal end using above-mentioned same processing mode
2.
According to time difference method, single-chip microcomputer processes obtained two time parameters, by above-mentioned (5) formula, can obtain the flow velocity of tested gas.
Described circuit is that single channel drives, and saves system power dissipation; Adopt pre-amplifier unit, can tiny signal be recorded, therefore be applicable to the measurement of mesolow gas flow.
Structure of the present invention is simple, by measuring the velocity of sound of ultrasound wave in gas medium thus eliminating the impact of gas density on gas flow measurement, has applicability widely.Present invention reduces system power dissipation, what make the common 3.6V battery of a joint supplies electric life more than 3 years simultaneously.
Claims (1)
1. the mesolow gas ultrasound ripple flow measurement circuit of low-power consumption, it is characterized in that, comprising: the first ultrasonic transducer (1), the second ultrasonic transducer (2), the first analog switch (3), the second analog switch (4), prime amplifier (5), bandpass filtering unit (6), comparing unit (7), driver element (8), voltage regulation unit (9), ultrasonic signal transmitting-receiving timing unit (10), single machine unit (11);
First ultrasonic transducer (1), the second ultrasonic transducer (2) symmetry are installed on the both sides of conduit axis plane, the axle center of the first ultrasonic transducer (1) and the second ultrasonic transducer (2) is on same straight line, first transducer (1) is arranged on pipeline (12) upstream, and the second transducer (2) is arranged on pipeline (12) downstream;
First transducer (1) input end is connected with the first end of the first analog switch (3), and the second transducer (2) input end is connected with the first end of the second analog switch (4); The other end of the first analog switch (3) is connected with the output terminal of driver element (8); The other end of the second analog switch (4) is connected with the input end of prime amplifier (5); The output terminal of prime amplifier (5) is connected with the input end of bandpass filtering unit (6); The output terminal of bandpass filtering unit (6) is connected with the input end of comparing unit (7); The output terminal of comparing unit (7) is connected with the stop pin of ultrasonic transmission/reception timing unit (10); The input end of driver element (8) is connected with the start pin of ultrasonic transmission/reception timing unit (10), fire pin; The gating pin of ultrasound wave transmission timing unit (10), clock pin, data input pin, data output pin are connected with the I/O mouth of single machine unit (11) respectively with 32K clock input pin; Described the first analog switch (3) Enable Pin, the second analog switch (4) Enable Pin are connected with the I/O mouth of single machine unit (11) respectively;
Described first analog switch and the second analog switch type selecting chip MAX4622; Described prime amplifier type selecting chip AD620, described bandpass filtering unit type selecting chip OPA836, described comparing unit type selecting chip LMV761; Described voltage regulation unit type selecting TPS76930, described driver element type selecting chip LT3572; Described ultrasonic signal transmitting-receiving timing unit type selecting chip TDC-GP21; Described single-chip microcomputer type selecting chip MSP430F448.
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| CN201510731968.6A CN105333911A (en) | 2015-11-01 | 2015-11-01 | Low-power-consumption middle-low-pressure gas ultrasonic flow measuring circuit |
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| CN201510731968.6A CN105333911A (en) | 2015-11-01 | 2015-11-01 | Low-power-consumption middle-low-pressure gas ultrasonic flow measuring circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105628116A (en) * | 2016-03-21 | 2016-06-01 | 杭州山科智能科技股份有限公司 | Low-power consumption ultrasonic wave transmitting time measuring method and circuit |
| CN107478305A (en) * | 2017-07-10 | 2017-12-15 | 辽宁航宇星物联仪表科技有限公司 | Ultrasonic wave gas meter measurement apparatus based on TDC7200 and TDC1000 |
| CN108593024A (en) * | 2018-06-06 | 2018-09-28 | 浙江大学 | Civilian ultrasonic wave gas meter |
| CN108801378A (en) * | 2018-06-06 | 2018-11-13 | 浙江大学 | The civilian ultrasonic wave gas meter and flow rate testing methods of integrated energy converter |
| CN108847827A (en) * | 2018-09-03 | 2018-11-20 | 浙江蓝宝石仪表科技有限公司 | A kind of continuous variable gain amplifying circuit applied to ultrasonic wave gas meter |
| CN108955788A (en) * | 2018-05-22 | 2018-12-07 | 常州大学 | A kind of contactless time difference method high-precision ultrasonic gas flowmeter |
| CN110017875A (en) * | 2019-03-12 | 2019-07-16 | 宁波水表股份有限公司 | Ultrasonic water meter method for vibration |
| CN112557697A (en) * | 2020-11-24 | 2021-03-26 | 安徽曼德克环境科技有限公司 | Ultrasonic flue gas velocity of flow measuring circuit |
| CN115388967A (en) * | 2022-08-29 | 2022-11-25 | 中煤科工集团重庆研究院有限公司 | Ultrasonic transit time measuring circuit and method for eliminating small-pipe-diameter measuring blind area |
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| CN104316119A (en) * | 2014-07-25 | 2015-01-28 | 浙江苍南仪表厂 | Ultrasonic measuring method and ultrasonic measuring device for double acoustic path gas flow |
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Patent Citations (4)
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| CN102147275A (en) * | 2011-03-18 | 2011-08-10 | 中国计量学院 | Low-power-consumption and high-precision ultrasonic flow rate measuring method and device |
| CN104897219A (en) * | 2014-03-05 | 2015-09-09 | 陕西多奇电子科技有限公司 | High-accuracy low-power consumption ultrasonic flowmeter |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628116A (en) * | 2016-03-21 | 2016-06-01 | 杭州山科智能科技股份有限公司 | Low-power consumption ultrasonic wave transmitting time measuring method and circuit |
| CN105628116B (en) * | 2016-03-21 | 2019-03-01 | 杭州山科智能科技股份有限公司 | A kind of measurement method and circuit of low-power consumption ultrasonic wave transmission time |
| CN107478305A (en) * | 2017-07-10 | 2017-12-15 | 辽宁航宇星物联仪表科技有限公司 | Ultrasonic wave gas meter measurement apparatus based on TDC7200 and TDC1000 |
| CN108955788A (en) * | 2018-05-22 | 2018-12-07 | 常州大学 | A kind of contactless time difference method high-precision ultrasonic gas flowmeter |
| CN108593024A (en) * | 2018-06-06 | 2018-09-28 | 浙江大学 | Civilian ultrasonic wave gas meter |
| CN108801378A (en) * | 2018-06-06 | 2018-11-13 | 浙江大学 | The civilian ultrasonic wave gas meter and flow rate testing methods of integrated energy converter |
| CN108847827A (en) * | 2018-09-03 | 2018-11-20 | 浙江蓝宝石仪表科技有限公司 | A kind of continuous variable gain amplifying circuit applied to ultrasonic wave gas meter |
| CN108847827B (en) * | 2018-09-03 | 2024-02-27 | 浙江蓝宝石仪表科技有限公司 | Continuous variable gain amplifying circuit applied to ultrasonic gas meter |
| CN110017875A (en) * | 2019-03-12 | 2019-07-16 | 宁波水表股份有限公司 | Ultrasonic water meter method for vibration |
| CN112557697A (en) * | 2020-11-24 | 2021-03-26 | 安徽曼德克环境科技有限公司 | Ultrasonic flue gas velocity of flow measuring circuit |
| CN115388967A (en) * | 2022-08-29 | 2022-11-25 | 中煤科工集团重庆研究院有限公司 | Ultrasonic transit time measuring circuit and method for eliminating small-pipe-diameter measuring blind area |
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Application publication date: 20160217 |