CN202024794U - Ultrasonic flow measuring device with low power consumption and high precision - Google Patents
Ultrasonic flow measuring device with low power consumption and high precision Download PDFInfo
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- CN202024794U CN202024794U CN2011200719596U CN201120071959U CN202024794U CN 202024794 U CN202024794 U CN 202024794U CN 2011200719596 U CN2011200719596 U CN 2011200719596U CN 201120071959 U CN201120071959 U CN 201120071959U CN 202024794 U CN202024794 U CN 202024794U
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Abstract
The utility model discloses an ultrasonic flow measuring device with low power consumption and high precision. The temperature compensation for a measuring result is required in the traditional flow-speed measurement. In the ultrasonic flow measuring device, the input end of a first transducer is respectively connected with one end of a first analog switch and one end of a second analog switch; the input end of a second transducer is respectively connected with one end of the first analog switch and one end of a third analog switch; the other end of the second analog switch, the other end of the third analog switch, the input end of a signal conditioning circuit and the input end of a second signal conditioning circuit are respectively connected with a pulse transmitting pin of a timing circuit; the output end of the first signal conditioning circuit is connected with a timing start pin of the timing circuit; the output end of the second signal conditioning circuit is connected with a timing end pin of the timing circuit; and a gating pin, a clock pin, a data input pin, a data output pin and a 32K clock input pin of the timing circuit are respectively connected with an I/O port of a singlechip computer. According to the ultrasonic flow measuring device, the influence of fluid temperature on the flow measurement is eliminated, the precision of flow measurement is improved, and the cost is saved.
Description
Technical field
The utility model belongs to technical field of fluid detection, relates to a kind of low power consumption high-precision device for measuring ultrasonic wave flow.
Background technology
Since the nineteen twenty-eight German had developed first ultrasonic flow meter, the development technology of ultrasonic flow meter had obtained continuous improvement.Deadly defects such as early stage ultrasonic flow is low in respect of precision, low-response, stability and poor reliability.But over nearly 20 years, because high-speed digital signal treatment technology and the develop rapidly of microprocessing and the progress of sensing technology, ultrasonic flow meter has not only overcome deficiency in the past, and do not change advantages such as fluid flow fields, easy to operate, low cost with its high precision, high noise immunity, non-cpntact measurement, obtained increasing insider's favor.The development prospect of measuring ultrasonic wave flow technology is limitless.
According to the difference of principle of work, ultrasonic flow meter can be divided into doppler type ultrasonic flowmeter and transit-time ultrasonic flow meter.Since doppler type ultrasonic flowmeter can only measure contain in right amount can reflection ultrasonic signal particle or the fluid of bubble, its applicability is restricted.At present most widely used is transit-time ultrasonic flow meter, and its principle of work is: the flow velocity of ultrasound wave in static fluid is C, and flow rate of fluid is V
0, the following current speed of ultrasound wave in fluid is V so
1=C+ V
0Cos θ, adverse current speed is V
2=C-V
0Distance between Cos θ, two transducers is L, then following current time t
1=L/ V
1, adverse current time t
2=L/ V
2, C again〉〉 V
0, can get time difference Δ T=t
2-t
1=2LV
0Cos θ/C
2So, just can obtain flow rate of fluid V by following formula by measuring time difference Δ T
0
But ultrasonic velocity is subjected to Temperature Influence very big in fluid, in measuring, flow rate of fluid needs measurement result is carried out temperature compensation, and traditional temperature compensation error is big and the low shortcoming of repeatability, and employing higher voltage drives sensor, cause the power consumption of device to increase, be difficult to satisfy on-the-spot requirement.
Summary of the invention
The purpose of this utility model provides a kind of low power consumption high-precision device for measuring ultrasonic wave flow, to improve measuring accuracy, reduces the power consumption of device.
Flow-measuring method of the present utility model is specifically: measure the following current travel-time t of ultrasound wave in fluid
1, adverse current travel-time t
2With electronic circuit delay time t
r, calculate the flow Q of pipeline inner fluid by formula (1).
D is the diameter of pipeline in the formula, and θ is the formed acute angle of line and pipeline axis between the transducer.
The device of realizing above-mentioned measuring method comprises that first transducer, second transducer, first analog switch, second analog switch, the 3rd analog switch, first signal conditioning circuit, secondary signal modulate circuit, ultrasound wave send timing circuit and single-chip microcomputer.
The first transducer input end be connected with an end of first analog switch, an end of second analog switch respectively; The second transducer input end be connected with an end of first analog switch, an end of the 3rd analog switch respectively;
The other end of the other end of second analog switch, the 3rd analog switch, the first signal conditioning circuit input end and secondary signal modulate circuit input end all are connected with the pulse emission pin of ultrasound wave transmission timing circuit;
The first signal conditioning circuit output terminal begins pin with the timing of ultrasound wave transmission timing circuit and is connected, and secondary signal modulate circuit output terminal is connected with the timing end pin that ultrasound wave sends timing circuit;
Gating pin, clock pin, data input pin, data output pin and 32K clock input pin that ultrasound wave sends timing circuit are connected with the I/O mouth of single-chip microcomputer respectively;
The described first analog switch Enable Pin, the second analog switch Enable Pin, the 3rd analog switch Enable Pin are connected with the I/O mouth of single-chip microcomputer respectively;
Described analog switch model is 74CBT1G125, and described first signal conditioning circuit is selected the 74HC14 chip for use, and described ultrasound wave sends timing circuit and selects the GP2 chip for use, and described single-chip microcomputer model is MSP420F437
Described secondary signal modulate circuit comprises first resistance R 1, second resistance R 2, capacitor C 1, chip TVL3501 and chip TVL2211; One end of capacitor C 1 is as secondary signal modulate circuit input end, 3 pin of another chip termination TVL3501 of capacitor C 1, first resistance R, 1 one termination 3V power supplys, second resistance R, 2 one end ground connection; 1 pin of first resistance R, 1 other end, second resistance R, 2 another chip termination TVL3501,5 pin of chip TVL3501 connect 1 pin of chip TVL2211, and 3 pin of chip TVL2211 connect the 1V power supply, and 4 pin of chip TVL2211 are as secondary signal modulate circuit output terminal.
The beneficial effects of the utility model are: the utility model is by measuring following current travel-time, adverse current travel-time and the electronic circuit delay time of ultrasound wave in fluid, calculate the speed of pipeline inner fluid, eliminated the influence of fluid temperature (F.T.) to flow measurement, improve the precision of flow measurement, saved the cost of device.In metering circuit, adopt the small signal driving transducer,, obtain following current travel-time, adverse current travel-time and electronic circuit delay time exactly by the feeble signal comparator circuit, lower the voltage and the electric current of systematic survey, thereby reduced the power consumption of systematic survey.
Description of drawings
Fig. 1 is a transit time ultrasonic flow meters measuring principle sketch;
Fig. 2 is the apparatus structure synoptic diagram in the utility model;
Fig. 3 is the device circuit figure in the utility model;
Fig. 4 is secondary signal modulate circuit figure.
Embodiment
Further specify the utility model below in conjunction with accompanying drawing.
With reference to Fig. 2, this low power consumption high-precision device for measuring ultrasonic wave flow comprises that first transducer, second transducer, first analog switch, second analog switch, the 3rd analog switch, first signal conditioning circuit, secondary signal modulate circuit, ultrasound wave send timing circuit and single-chip microcomputer.
The first transducer input end be connected with an end of first analog switch, an end of second analog switch respectively; The second transducer input end be connected with an end of first analog switch, an end of the 3rd analog switch respectively;
The other end of the other end of second analog switch, the 3rd analog switch, the first signal conditioning circuit input end and secondary signal modulate circuit input end all are connected with the pulse emission pin of ultrasound wave transmission timing circuit;
The first signal conditioning circuit output terminal begins pin with the timing of ultrasound wave transmission timing circuit and is connected, and secondary signal modulate circuit output terminal is connected with the timing end pin that ultrasound wave sends timing circuit;
Gating pin, clock pin, data input pin, data output pin and 32K clock input pin that ultrasound wave sends timing circuit are connected with the I/O mouth of single-chip microcomputer respectively;
The described first analog switch Enable Pin, the second analog switch Enable Pin, the 3rd analog switch Enable Pin are connected with the I/O mouth of single-chip microcomputer respectively;
Described analog switch model is 74CBT1G125, and described first signal conditioning circuit is selected the 74HC14 chip for use, and described ultrasound wave sends timing circuit and selects the GP2 chip for use, and described single-chip microcomputer model is MSP420F435
Described secondary signal modulate circuit comprises first resistance R 1, second resistance R 2, capacitor C 1, chip TVL3501 and chip TVL2211; One end of capacitor C 1 is as secondary signal modulate circuit input end, 3 pin of another chip termination TVL3501 of capacitor C 1, first resistance R, 1 one termination 3V power supplys, second resistance R, 2 one end ground connection; 1 pin of first resistance R, 1 other end, second resistance R, 2 another chip termination TVL3501,5 pin of chip TVL3501 connect 1 pin of chip TVL2211, and 3 pin of chip TVL2211 connect the 1V power supply, and 4 pin of chip TVL2211 are as secondary signal modulate circuit output terminal.
With reference to Fig. 3, the analog switch model is 74CBT1G125, and first signal conditioning circuit is selected the 74HC14 chip for use, and ultrasound wave sends timing circuit and selects the GP2 chip for use, and the single-chip microcomputer model is MSP420F435.
The input end of first transducer is connected with the A end of the A of first analog switch end, second analog switch respectively, the second transducer input end with hold with the B of first analog switch respectively, the A of the 3rd analog switch holds and is connected;
The B end of second analog switch, the B end of the 3rd analog switch, the 1A pin of chip 74HC14 all are connected with the FIRE1 pin of chip GP2 with secondary signal modulate circuit input end;
The 1Y pin of chip 74HC14 is connected with the START pin of chip GP2, and secondary signal modulate circuit output terminal is connected with the STOP pin of chip GP2;
The SSN pin of chip GP2, SCK pin, SI pin, SO pin and CLK32IN pin are connected with P1.6, P1.7, P2.0, P2.1 and the P1.5 pin of chip MSP430F435 respectively;
The EN pin of first analog switch, second analog switch and the 3rd analog switch is connected with the P1.2 pin with P1.3, the P1.1 of chip MSP430F435 respectively;
With reference to Fig. 4, the secondary signal modulate circuit comprises first resistance R 1, second resistance R 2, capacitor C 1, chip TVL3501 and chip TVL2211; One end of capacitor C 1 is as secondary signal modulate circuit input end, 3 pin of another chip termination TVL3501 of capacitor C 1, first resistance R, 1 one termination 3V power supplys, second resistance R, 2 one end ground connection; 1 pin of first resistance R, 1 other end, second resistance R, 2 another chip termination TVL3501,5 pin of chip TVL3501 connect 1 pin of chip TVL2211, and 3 pin of chip TVL2211 connect the 1V power supply, and 4 pin of chip TVL2211 are as secondary signal modulate circuit output terminal.
As shown in Figure 1, first transducer and the second transducer horizontal symmetrical are installed on the both sides on piping axis plane, first transducer is installed in the downstream of pipeline, and second transducer is installed in the upstream of pipeline.The Single-chip Controlling second analog switch closure at first, single-chip microcomputer is given signal of chip GP2, the pulse producer of chip GP2 is penetrated pulse signal by the FIRE1 human hair combing waste, this pulse signal drives first transducer, simultaneously, this signal arrives the START pin of chip GP2 after through the shaping of first signal conditioning circuit, chip GP2 picks up counting, first transducer is activated the transponder pulse signal, through in fluid, propagating, second transducer receives this pulse signal, this moment Single-chip Controlling the 3rd analog switch closure, this pulse signal arrives the input end of secondary signal modulate circuit, this signal is through filtering, shaping arrives the STOP pin of chip GP2, GP2 stops timing, obtains adverse current time t
2
In like manner, Single-chip Controlling the 3rd analog switch closure at first, single-chip microcomputer is given signal of chip GP2, the pulse producer of chip GP2 is penetrated pulse signal by the FIRE1 human hair combing waste, this pulse signal drives second transducer, simultaneously, this signal arrives the START pin of chip GP2 through the shaping of first signal conditioning circuit, chip GP2 picks up counting, second transducer is activated the transponder pulse signal, through propagating in fluid, first transducer receives this pulse signal, at this moment the Single-chip Controlling second analog switch closure, this pulse signal arrives the input end of secondary signal modulate circuit, this signal is through filtering, shaping arrives the STOP pin of chip GP2, and chip GP2 stops timing, obtains following current time t
1
Single-chip microcomputer is at first controlled first analog switch and the second analog switch closure, single-chip microcomputer is given signal of chip GP2, the pulse producer of chip GP2 is penetrated pulse signal by the FIRE1 human hair combing waste, this pulse signal arrives the B end of second analog switch, simultaneously, this signal arrives the START pin of chip GP2 through the first signal conditioning circuit shaping, chip GP2 picks up counting, this pulse signal arrives the A end of the 3rd analog switch by second analog switch and first analog switch, this moment Single-chip Controlling the 3rd analog switch closure, this pulse signal arrives the input end of secondary signal modulate circuit, pulse signal is shaped into the STOP pin that reaches chip GP2 through filtering, chip GP2 stops timing, obtains electronic circuit delay time t
rThrough type (2) calculates the flow Q of fluid,
Wherein D is a pipe diameter, and θ is known.
Claims (1)
1. low power consumption high-precision ultrasonic flow device, comprise that first transducer, second transducer, first analog switch, second analog switch, the 3rd analog switch, first signal conditioning circuit, secondary signal modulate circuit, ultrasound wave send timing circuit and single-chip microcomputer, is characterized in that:
The first transducer input end be connected with an end of first analog switch, an end of second analog switch respectively; The second transducer input end be connected with an end of first analog switch, an end of the 3rd analog switch respectively;
The other end of the other end of second analog switch, the 3rd analog switch, the first signal conditioning circuit input end and secondary signal modulate circuit input end all are connected with the pulse emission pin of ultrasound wave transmission timing circuit;
The first signal conditioning circuit output terminal begins pin with the timing of ultrasound wave transmission timing circuit and is connected, and secondary signal modulate circuit output terminal is connected with the timing end pin that ultrasound wave sends timing circuit;
Gating pin, clock pin, data input pin, data output pin and 32K clock input pin that ultrasound wave sends timing circuit are connected with the I/O mouth of single-chip microcomputer respectively;
The described first analog switch Enable Pin, the second analog switch Enable Pin, the 3rd analog switch Enable Pin are connected with the I/O mouth of single-chip microcomputer respectively;
Described analog switch model is 74CBT1G125, and described first signal conditioning circuit is selected the 74HC14 chip for use, and described ultrasound wave sends timing circuit and selects the GP2 chip for use, and described single-chip microcomputer model is MSP420F437
Described secondary signal modulate circuit comprises first resistance R 1, second resistance R 2, capacitor C 1, chip TVL3501 and chip TVL2211; One end of capacitor C 1 is as secondary signal modulate circuit input end, 3 pin of another chip termination TVL3501 of capacitor C 1, first resistance R, 1 one termination 3V power supplys, second resistance R, 2 one end ground connection; 1 pin of first resistance R, 1 other end, second resistance R, 2 another chip termination TVL3501,5 pin of chip TVL3501 connect 1 pin of chip TVL2211, and 3 pin of chip TVL2211 connect the 1V power supply, and 4 pin of chip TVL2211 are as secondary signal modulate circuit output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200719596U CN202024794U (en) | 2011-03-18 | 2011-03-18 | Ultrasonic flow measuring device with low power consumption and high precision |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200719596U CN202024794U (en) | 2011-03-18 | 2011-03-18 | Ultrasonic flow measuring device with low power consumption and high precision |
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| Publication Number | Publication Date |
|---|---|
| CN202024794U true CN202024794U (en) | 2011-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200719596U Expired - Fee Related CN202024794U (en) | 2011-03-18 | 2011-03-18 | Ultrasonic flow measuring device with low power consumption and high precision |
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|---|---|
| CN (1) | CN202024794U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914336A (en) * | 2012-10-29 | 2013-02-06 | 杭州市质量技术监督检测院 | Multi-sensor thermal-type gas flow measuring circuit based on MSP430 (mixed signal processor 430) |
| CN111486911A (en) * | 2020-05-31 | 2020-08-04 | 合肥工业大学 | STM 32-based low-power-consumption gas ultrasonic flowmeter system |
-
2011
- 2011-03-18 CN CN2011200719596U patent/CN202024794U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914336A (en) * | 2012-10-29 | 2013-02-06 | 杭州市质量技术监督检测院 | Multi-sensor thermal-type gas flow measuring circuit based on MSP430 (mixed signal processor 430) |
| CN102914336B (en) * | 2012-10-29 | 2014-07-02 | 杭州市质量技术监督检测院 | Multi-sensor thermal-type gas flow measuring circuit based on MSP430 (mixed signal processor 430) |
| CN111486911A (en) * | 2020-05-31 | 2020-08-04 | 合肥工业大学 | STM 32-based low-power-consumption gas ultrasonic flowmeter system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111102 Termination date: 20120318 |