CN104236650A - Ultrasonic wave flow measurement circuit and method through phase difference method - Google Patents
Ultrasonic wave flow measurement circuit and method through phase difference method Download PDFInfo
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- CN104236650A CN104236650A CN201410537162.9A CN201410537162A CN104236650A CN 104236650 A CN104236650 A CN 104236650A CN 201410537162 A CN201410537162 A CN 201410537162A CN 104236650 A CN104236650 A CN 104236650A
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Abstract
The invention provides an ultrasonic wave flow measurement circuit and method through a phase difference method. The ultrasonic wave flow measurement circuit comprises a reference voltage electric unit U0 and a pulse generator U2 and is characterized in that output reference voltage VREF of the reference voltage electric unit U0 is connected with a negative end of an echo shaping comparer U1 and connected with a positive end of the echo shaping comparer U1 through a simulation switch SW2. The positive end of the echo shaping comparer U1 is connected with a capacitor C1 and a capacitor C2 through a simulation switch SW1, the pulse generator U2 is connected with a transducer T1 and the capacitor C1 through a resistor R1, connected with a transducer T2 and the capacitor C2 through a resistor R2 and connected with a phase discriminator U3. Output of the echo shaping comparer U1 is connected with a CLK end of the phase discriminator U3, an input end D of the phase discriminator U3 is connected with high level, and an output end Q of the phase discriminator U3 is connected with an IN end of a TDC unit.
Description
Technical field
The present invention relates to measuring ultrasonic wave flow field, concretely, relate to a kind of difference method measuring ultrasonic wave flow circuit and measuring method thereof.
Background technology
Measuring ultrasonic wave flow adopts Principles of Acoustics to measure the rate of flow of fluid flowing through pipeline: be arranged on flow conduit wall by a pair ultrasonic transducer, in flow measurement process, element on wiring board applies pumping signal to transmitting transducer makes it produce ultrasound wave, receiving transducer is converted into electric signal after receiving signal, metering circuit can write down the time from being transmitted into reception, according to the principle of Kepler's effect, under co-current flow and counter-current flow situation, hyperacoustic velocity of propagation can change, and utilizes the concurrent-countercurrent time difference measured can calculate the speed of fluid.In actual applications, have time difference method and difference method two kinds of modes, wherein time difference method is with German ACAM company GP21 for representative, and it at most enough can measure the time of return of three echo-pulses, but easily occurs the problem that Small flowrate measurement error is large in actual applications; Current difference method scheme is formed mainly with position discrete component, the phase differential pulse that use obtains carries out constant-current charge to electric capacity, the method of AD conversion is adopted to obtain magnitude of voltage, and then extrapolate flow, advantage is the value can measuring multiple phase differential, precision there is larger advantage, shortcoming is that discrete component brings cost and product yield problem, and can nonlinearity erron be brought in charging process, this error is with temperature and change in voltage, be difficult to eliminate, such as publication number just have employed a large amount of discrete components for the patent of invention disclosed in CN102200457A.For addressing this problem, the invention discloses a kind of novel difference method measuring ultrasonic wave flow circuit and measuring method.
Summary of the invention:
The technical problem to be solved in the present invention is to provide a kind of difference method measuring ultrasonic wave flow circuit and measuring method thereof, has better stability and measuring accuracy.
The present invention adopts following technological means to realize goal of the invention:
A kind of difference method measuring ultrasonic wave flow circuit, comprise reference voltage electric unit U0 and pulse producer U2, it is characterized in that: the output reference voltage VREF of described reference voltage electric unit U0 connects the negative terminal of echo shaping comparer U1, be connected with the anode of echo shaping comparer U1 by analog switch SW2 simultaneously, the anode of described echo shaping comparer U1 is by analog switch SW1 and electric capacity C1, electric capacity C2 connects, described pulse producer U2 by resistance R1 respectively with transducer T1, electric capacity C1 connects, described pulse producer U2 also by resistance R2 respectively with transducer T2, electric capacity C2 connects, described pulse producer U2 also connects phase detector U3, the output of described echo shaping comparer U1 connects the CLK end of described phase detector U3, the input end D of described phase detector U3 connects high level, the output terminal Q of described phase detector U3 connects the IN end of TDC unit.
As the further restriction to the technical program, the FIRE_UP port of described pulse producer U2 is connected with transducer T1, electric capacity C1 respectively by resistance R1, and the FIRE_DN port of described pulse producer U2 is also connected with transducer T2, electric capacity C2 respectively by resistance R2.
As the further restriction to the technical program, the FIRE_UP port of described pulse producer U2 or FIRE_DN port produce the transducer excitation signal of 1MHz dutycycle 50%.
As the further restriction to the technical program, the CLK_REF end of described pulse producer U2 is connected with the RESET end of described phase detector U3.
As the further restriction to the technical program, the CLK_REF of described pulse producer U2 hold a generation 1MHz be synchronized with transducer excitation signal and dutycycle is the signal of 75%.
As the further restriction to the technical program, described phase detector U3 is made up of the d type flip flop of 1 band asynchronous reset port.
A kind of difference method ultrasonic flow measuring method, is characterized in that: comprise the steps:
(1) circuit receives upstream measuring command;
(2) described analog switch SW1 is connected with described electric capacity C2, and described analog switch SW2 connects, the FIRE_DN output low level of described pulse producer;
(3) wait for one period that can set, electric capacity C2 is charged to the value of reference voltage VREF, and analog switch SW2 disconnects;
(4) FIRE_UP of pulse producer U2 exports the 1MHz square-wave pulse of specifying number, and send the reference signal CLK_REF of 1MHz simultaneously, be supplied to described phase detector U3, described ultrasonic transducer T1, as transmitting transducer, starts to send ultrasound wave;
(5) described ultrasonic transducer T2 is as receiving transducer, after receiving echo, by described electric capacity C2 and described analog switch SW1, echo is coupled to the anode of described echo shaping comparer U1, superposes with the DC voltage of anode, the DC voltage of anode is numerically equal with reference voltage VREF, the reference voltage VREF of comparer U1 anode input signal and comparer U1 negative terminal compares, convert the square wave of a 1MHz to, i.e. echo-pulse, output to described phase detector U3;
(6) described phase detector U3 carries out phase demodulation to echo-pulse and reference signal CLK_REF, produces the phase differential pulse of two paths of signals;
(7) described TDC unit is measured multiple phase differential pulse widths that described phase detector U3 exports, and measured pulse number can be established, and finally exports high-resolution time measurement result, represents the phase difference value of echo-pulse relative to reference signal of upstream transmission;
(8) a downstream phase difference measurement is carried out in the mode similar with described (2)-(7), difference is in measured downstream, described analog switch SW1 is connected with described electric capacity C1, described analog switch SW2 connects, the FIRE_DN output low level of described pulse producer U2, the anode of described echo comparer U1 is connected with electric capacity C1 by described analog switch SW1, receives the echoed signal from transducer T1;
(9) external microprocessor from TDC export obtain upstream measure and measured downstream respectively relative to the phase differential of the reference signal CLK_REF of pulse producer U2, just can calculate the phase differential between upstream echo and downstream echo, and then extrapolate flow velocity.
Compared with prior art, advantage of the present invention and good effect are: present invention employs the digital TDC of high resolving power and carry out phase differential, there is stronger anti-interference, and can the multiple phase difference value of continuous coverage in one-shot measurement process, the stability of measurement data and precision are improved all greatly.
Accompanying drawing explanation
Fig. 1 is the block diagram of the preferred embodiment of the present invention.
Fig. 2 is the working waveform figure of phase detector in the preferred embodiment of the present invention.
Embodiment:
Below in conjunction with embodiment, further illustrate the present invention.
See Fig. 1 and Fig. 2, the present invention includes reference voltage electric unit U0, echo shaping comparer U1, pulse producer U2, phase detector U3, TDC unit U4, analog switch SW1, analog switch SW2, described pulse producer U2 can produce the transducer excitation signal of 1MHz dutycycle 50% at FIRE_UP or FIRE_DN port, the FIRE_UP port of described pulse producer U2 by resistance R1 respectively with transducer T1, electric capacity C1 is connected, FIRE_DN port by resistance R2 respectively with transducer T2, electric capacity C2 is connected, CLK_REF end is connected with the RESET end of described phase detector U3, CLK_REF is the signal being synchronized with transducer excitation of a 1MHz, dutycycle is 75%, the reference voltage VREF that described reference voltage unit U0 exports is connected with the negative input end of echo shaping comparer U1, as the comparative voltage of echo shaping comparer U1, be connected with echo shaping comparer U1 anode by analog switch SW2 simultaneously, by charging to electric capacity C1 or C2 before echo produces, the signal DC level being coupled to echo shaping comparer U1 anode is made to be VREF, the anode of described echo shaping comparer U1 is connected with electric capacity C1, C2 by analog switch SW1, the ultrasonic signal receiving transducing generation is shaped as the square wave of 1MHz, and the output of echo comparer U1 is connected to the CLK end of phase detector U3, described phase detector U3 is structurally made up of the d type flip flop of 1 asynchronous low active homing port of band, and produce the phase differential pulse of echoed signal and CLK_REF, input end D connects high level, exports the IN end that Q is connected to described TDC unit, described TDC unit is the time-to-digital conversion circuit of a high resolving power (<100ps), for measuring the width of the high level pulse of multiple IN port input, its input port IN connects the output of described phase detector U3, and output terminal T represents the pulsewidth result measured.
The technical program additionally provides a kind of difference method measuring ultrasonic wave flow circuit and measuring method thereof, comprises the following steps:
(1) circuit receives upstream measuring command;
(2) described analog switch SW1 is connected with described electric capacity C2, and described analog switch SW2 connects, the FIRE_DN output low level of described pulse producer;
(3) wait for one period that can set, electric capacity C2 is charged to the value of reference voltage VREF, and analog switch SW2 disconnects;
(4) FIRE_UP of pulse producer U2 exports the 1MHz square-wave pulse of specifying number, and send the reference signal CLK_REF of 1MHz simultaneously, be supplied to described phase detector U3, described ultrasonic transducer T1, as transmitting transducer, starts to send ultrasound wave;
(5) described ultrasonic transducer T2 is as receiving transducer, after receiving echo, by described electric capacity C2 and described analog switch SW1, echo is coupled to the anode of described echo shaping comparer U1, superposes with the DC voltage of anode, the DC voltage of anode is numerically equal with reference voltage VREF, the reference voltage VREF of comparer U1 anode input signal and comparer U1 negative terminal compares, convert the square wave of a 1MHz to, i.e. echo-pulse, output to described phase detector U3;
(6) described phase detector U3 carries out phase demodulation to echo-pulse and reference signal CLK_REF, produces the phase differential pulse of two paths of signals;
(7) described TDC unit is measured multiple phase differential pulse widths that described phase detector U3 exports, and measured pulse number can be established, and finally exports high-resolution time measurement result, represents the phase difference value of echo-pulse relative to reference signal of upstream transmission;
(8) a downstream phase difference measurement is carried out in the mode similar with described (2)-(7), difference is in measured downstream, described analog switch SW1 is connected with described electric capacity C1, described analog switch SW2 connects, the FIRE_DN output low level of described pulse producer U2, the anode of described echo comparer U1 is connected with electric capacity C1 by described analog switch SW1, receives the echoed signal from transducer T1;
(9) external microprocessor from TDC export obtain upstream measure and measured downstream respectively relative to the phase differential of the reference signal CLK_REF of pulse producer U2, just can calculate the phase differential between upstream echo and downstream echo, and then extrapolate flow velocity.
Certainly, above-mentioned explanation is not limitation of the present invention, and the present invention is also not limited only to above-mentioned citing, and the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also belong to protection scope of the present invention.
Claims (7)
1. a difference method measuring ultrasonic wave flow circuit, comprise reference voltage electric unit U0 and pulse producer U2, it is characterized in that: the output reference voltage VREF of described reference voltage electric unit U0 connects the negative terminal of echo shaping comparer U1, be connected with the anode of echo shaping comparer U1 by analog switch SW2 simultaneously, the anode of described echo shaping comparer U1 is by analog switch SW1 and electric capacity C1, electric capacity C2 connects, described pulse producer U2 by resistance R1 respectively with transducer T1, electric capacity C1 connects, described pulse producer U2 also by resistance R2 respectively with transducer T2, electric capacity C2 connects, described pulse producer U2 also connects phase detector U3, the output of described echo shaping comparer U1 connects the CLK end of described phase detector U3, the input end D of described phase detector U3 connects high level, the output terminal Q of described phase detector U3 connects the IN end of TDC unit.
2. difference method measuring ultrasonic wave flow circuit according to claim 1, it is characterized in that: the FIRE_UP port of described pulse producer U2 is connected with transducer T1, electric capacity C1 respectively by resistance R1, the FIRE_DN port of described pulse producer U2 is also connected with transducer T2, electric capacity C2 respectively by resistance R2.
3. difference method measuring ultrasonic wave flow circuit according to claim 2, is characterized in that: the FIRE_UP port of described pulse producer U2 or FIRE_DN port produce the transducer excitation signal of 1MHz dutycycle 50%.
4. difference method measuring ultrasonic wave flow circuit according to claim 3, is characterized in that: the CLK_REF end of described pulse producer U2 is connected with the RESET end of described phase detector U3.
5. difference method measuring ultrasonic wave flow circuit according to claim 4, is characterized in that: the CLK_REF of described pulse producer U2 hold a generation 1MHz be synchronized with transducer excitation signal and dutycycle is the signal of 75%.
6. difference method measuring ultrasonic wave flow circuit according to claim 4, is characterized in that: described phase detector U3 is made up of the d type flip flop of 1 band asynchronous reset port.
7. differ a method ultrasonic flow measuring method, it is characterized in that: comprise the steps:
(1) circuit receives upstream measuring command;
(2) described analog switch SW1 is connected with described electric capacity C2, and described analog switch SW2 connects, the FIRE_DN output low level of described pulse producer;
(3) wait for one period that can set, electric capacity C2 is charged to the value of reference voltage VREF, and analog switch SW2 disconnects;
(4) FIRE_UP of pulse producer U2 exports the 1MHz square-wave pulse of specifying number, and send the reference signal CLK_REF of 1MHz simultaneously, be supplied to described phase detector U3, described ultrasonic transducer T1, as transmitting transducer, starts to send ultrasound wave;
(5) described ultrasonic transducer T2 is as receiving transducer, after receiving echo, by described electric capacity C2 and described analog switch SW1, echo is coupled to the anode of described echo shaping comparer U1, superpose with the DC voltage of anode, the DC voltage of anode is numerically equal with reference voltage VREF, and comparer U1 anode inputs
letternumber and the reference voltage VREF of comparer U1 negative terminal compare, convert the square wave of a 1MHz to, i.e. echo-pulse, output to described phase detector U3;
(6) described phase detector U3 carries out phase demodulation to echo-pulse and reference signal CLK_REF, produces the phase differential pulse of two paths of signals;
(7) described TDC unit is measured multiple phase differential pulse widths that described phase detector U3 exports, and measured pulse number can be established, and finally exports high-resolution time measurement result, represents the phase difference value of echo-pulse relative to reference signal of upstream transmission;
(8) a downstream phase difference measurement is carried out in the mode similar with described (2)-(7), difference is in measured downstream, described analog switch SW1 is connected with described electric capacity C1, described analog switch SW2 connects, the FIRE_DN output low level of described pulse producer U2, the anode of described echo comparer U1 is connected with electric capacity C1 by described analog switch SW1, receives the echoed signal from transducer T1;
(9) external microprocessor from TDC export obtain upstream measure and measured downstream respectively relative to the phase differential of the reference signal CLK_REF of pulse producer U2, just can calculate the phase differential between upstream echo and downstream echo, and then extrapolate flow velocity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105115552A (en) * | 2015-04-30 | 2015-12-02 | 中国人民解放军国防科学技术大学 | Ultrasonic wave flow measuring method and device based on sidetone phase measurement |
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| CN201828295U (en) * | 2010-10-28 | 2011-05-11 | 利尔达科技有限公司 | Phase difference type ultrasonic wave flow metering device |
| CN102200457A (en) * | 2010-03-26 | 2011-09-28 | 河南新天科技股份有限公司 | Ultrasonic flow detection circuit |
| CN102749135A (en) * | 2011-04-19 | 2012-10-24 | 阿凯姆-测量电器有限责任公司 | Method and device used for measuring TOF of ultrasonic signal in fluid |
| CN204214488U (en) * | 2014-10-13 | 2015-03-18 | 山东力创科技有限公司 | A kind of difference method measuring ultrasonic wave flow circuit |
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- 2014-10-13 CN CN201410537162.9A patent/CN104236650A/en active Pending
Patent Citations (4)
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| CN102200457A (en) * | 2010-03-26 | 2011-09-28 | 河南新天科技股份有限公司 | Ultrasonic flow detection circuit |
| CN201828295U (en) * | 2010-10-28 | 2011-05-11 | 利尔达科技有限公司 | Phase difference type ultrasonic wave flow metering device |
| CN102749135A (en) * | 2011-04-19 | 2012-10-24 | 阿凯姆-测量电器有限责任公司 | Method and device used for measuring TOF of ultrasonic signal in fluid |
| CN204214488U (en) * | 2014-10-13 | 2015-03-18 | 山东力创科技有限公司 | A kind of difference method measuring ultrasonic wave flow circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105115552A (en) * | 2015-04-30 | 2015-12-02 | 中国人民解放军国防科学技术大学 | Ultrasonic wave flow measuring method and device based on sidetone phase measurement |
| CN105115552B (en) * | 2015-04-30 | 2017-12-19 | 中国人民解放军国防科学技术大学 | The ultrasonic flow measuring method and device of phase are surveyed based on sidetone |
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Application publication date: 20141224 |