CN206905826U - Low-consumption ultrasonic flow measurement meter echo signal processing circuit - Google Patents
Low-consumption ultrasonic flow measurement meter echo signal processing circuit Download PDFInfo
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- CN206905826U CN206905826U CN201720786356.1U CN201720786356U CN206905826U CN 206905826 U CN206905826 U CN 206905826U CN 201720786356 U CN201720786356 U CN 201720786356U CN 206905826 U CN206905826 U CN 206905826U
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Abstract
The utility model discloses a kind of low-consumption ultrasonic flow measurement meter echo signal processing circuit.Ultrasound signal receipt sensor connects two inputs of variable gain amplifier respectively, the signal output part of variable gain amplifier and the positive input of operational amplifier are connected, and the gain-controlled voltage of variable gain amplifier is connected with the digital third channel for turning analog circuit；The signal output part of variable gain amplifying unit is connected with the positive input terminal of peak detection unit, and peak detection unit enable signal is connected with single-chip processor i/o mouth, and the output signal of peak detection unit is connected with single-chip processor i/o mouth；The signal output part of variable gain amplifying unit is connected with the two-way comparator positive input terminal in first arrival detection unit, two-way comparator negative input end turns the first passage of analog circuit with numeral respectively and second channel is connected, and the signal output part of first arrival detection unit is connected with single-chip processor i/o mouth.The utility model realizes control peak value measurement, reduces the power consumption of circuit.
Description
Technical field
The utility model belongs to flow detection technical field, is related to a kind of low-consumption ultrasonic flow measurement meter echo signal processing
Circuit.
Background technology
As government's Accelerating The Construction resource-conserving, the trend of friendly environment society, flow measurement are also begun to towards height
Precision, high duplication, the direction of low pressure loss.Ultrasonic flowmeter is compared with other flowmeters, owner's above feature.
Ultrasonic flowmeter typically all carries out flow measurement using time difference method, i.e., uses two ultrasonic wave transducers of upstream and downstream respectively
Device launches ultrasonic signal, measures the time of ultrasonic signal received by another transducer, the difference and pipe of two time
Rate of flow of fluid in road is relevant.But because the acoustic impedance of gas is larger, so ultrasonic signal propagation attenuation in gas is tight
Weight, the echo-signal received by sensor are very faint, it is therefore desirable to processing are amplified to echo-signal and due to surveying
The repeatability of amount requires to must assure that the echo-signal peak value received every time is consistent.
Generally use envelope method, echo-signal is subjected to envelope processing, changes multiplication factor adjustment envelope peak, keep
It is equal with setting magnitude of voltage, envelope signal is then measured to the time of peaking, so as to obtain the propagation time of ultrasonic signal.
This method can only be rough the measurement propagation time, the decline of precision can be caused, while identical multiplication factor can influence echo
The waveform of signal, which makes envelope waveform change, can introduce new measurement error.
Another kind is to set single threshold, and echo Mintrop wave signal relatively obtains square-wave signal with threshold voltage, at this moment first
The arrival time of individual square wave, just the flight time as ultrasonic signal, this method were vulnerable to interference effect.In addition exist
Can also there is whirlpool in gas flowing, this can cause under identical gas flow rate, and the sound path of ultrasonic propagation can have differences.
Because ultrasonic flowmeter has the characteristics of high accuracy, high duplication, so in echo signal processing, if deal with improperly by
Flowmeter accuracy and repeatability can be caused to decline, or even metering tasks can not be completed.
The content of the invention
The utility model is in view of the shortcomings of the prior art, it is proposed that low-consumption ultrasonic flow measurement meter echo signal processing electricity
Road, for handling the echo-signal received by ultrasonic sensor.
The technical solution of the utility model is：
The utility model includes variable gain amplifying unit, peak detection unit, first arrival detection unit and single-chip microcomputer list
Member；Ultrasound signal receipt sensor connects two inputs of variable gain amplifier in variable gain amplifying unit respectively, can
The signal output part of variable-gain amplifier is connected with the positive input of operational amplifier in variable gain amplifying unit, variable increasing
Numeral turns the third channel connection of analog circuit in the gain-controlled voltage and single machine unit of beneficial amplifier；Variable gain is amplified
The signal output part of unit is connected with the positive input terminal of peak detection unit, peak detection unit enable signal and single-chip microcomputer list
Single-chip processor i/o mouth is connected in member, and the output signal of peak detection unit is connected with single-chip processor i/o mouth；Variable gain amplifying unit
Signal output part be connected with the two-way comparator positive input terminal in first arrival detection unit, two-way comparator negative input end respectively with
The first passage that numeral turns analog circuit connects with second channel, in the signal output part and single machine unit of first arrival detection unit
Single-chip processor i/o mouth connection.
The beneficial effects of the utility model are：The measuring circuit of the utility model design ensures the echo letter measured every time
Number peak value is identical, i.e. the signal intensity of echo-signal is consistent, while can be reduced to measure the flight time due to returning using Mintrop wave
The waveform of echo-signal caused by the multiplication factor difference of ripple signal processing circuit changes, and influences the precision and again of measurement
Renaturation.Whole echo signal processing realizes control peak value measurement, reduces the power consumption of circuit, realizes low-power consumption.
Brief description of the drawings
Fig. 1 is echo signal processing system block diagram；
Fig. 2 is variable gain amplifying unit circuit diagram；
Fig. 3 is peak detection unit circuit diagram；
Fig. 4 is first arrival detection element circuit figure；
Fig. 5 is single machine unit connection figure；
Fig. 6 is low-consumption ultrasonic flow measurement meter echo signal processing method flow diagram；
Fig. 7 is first arrival detection signal time-domain diagram.
Embodiment
Below in conjunction with accompanying drawing further illustrate the utility model proposes a kind of low-consumption ultrasonic flow measurement meter echo-signal
Process circuit.
Reference picture 1, whole system frame structure are that the echo-signal that will be received carries out letter in variable gain amplifying unit
Number amplification, amplified signal by first arrival detection unit by echo-signal be transformed into square wave be passed to single machine unit, single machine unit
Square-wave signal is received, by the enabled progress peakvalue's checking of peak detection unit, detection peak value is passed to single machine unit and setting
Magnitude of voltage is compared so as to control variable gain amplifying unit multiplication factor, until the sampled signal that detects is in the model of setting
In enclosing, single machine unit will send the time T for the square wave rising edge that ultrasonic signal is passed to Mintrop wave unit1With send ultrasonic wave
Signal is passed to the time T of square wave trailing edge to Mintrop wave unit2Record, then the flight time T of Mintrop wave is：
Reference picture 2, the linear variable gain operational amplifier LMH6502 that variable gain amplifying unit uses, and computing
Amplifier OPA836.Variable gain amplifying unit passes through according to control voltage VGThe multiplication factor of adjustment ultrasonic echo signal reaches
Peak value to the ultrasonic echo signal measured every time is consistent, so as to improve the accuracy of measurement.Ultrasound signal receipt passes
Sensor T21 both ends connect electric capacity C21, electric capacity C22 one end respectively.Linear variable gain operational amplifier LMH6502 is U21, U21
1 pin, 13 pin, 14 pin connect 5V voltages, U21 2 pin meet control voltage VG, U21 3 pin connect respectively electric capacity C21 the other end and
Resistance R21 one end, U21 4 pin and 5 pin are connected on resistance R23 both ends, U21 6 pin connect respectively electric capacity C22 the other end and
Resistance R22 one end, U21 7 pin and 8 pin ground connection, U21 9 pin and 11 pin difference connecting resistance R21, resistance R22, resistance R24,
Resistance R25 and electric capacity C23 one end.U21 10 pin connect electric capacity C24 and resistance R26 one end, U21 12 pin connecting resistance R26's
The other end.Resistance R25 another termination 5V voltages.Resistance R24 and electric capacity the C23 other end are grounded.Another termination electricity of electric capacity C24
Hinder R27.Operational amplifier OPA836 is U22, and U22 5 pin and 6 pin connect 3V voltages, U22 2 pin ground connection, and U22 4 pin meet 1.5V
Voltage, the U22 3 pin connecting resistance R27 other end and electric capacity C25 and resistance R28 one end, U22 1 pin connect electric capacity C25 and
The resistance R28 other end, and it is used as signal Signal_1 output ends.
Reference picture 3, peak detection unit use operational amplifier TLV2470A and optocoupler TLP521.Peak detection unit leads to
The state of enable signal SHUT_DOWN control peak detection units is crossed, when SHUT_DOWN signals are low, peak detection unit
Peak value sampling is carried out, measures the peak value of echo-signal.Operational amplifier TLV2470A is U31, and U31 6 pin connect 3V, U31 2 pin
Ground connection, U31 4 pin connect diode D32 one end, and U31 3 pin meet limiter diode D31 respectively, resistance R31 one end and
Signal Signal_1 inputs, U31 5 pin are enable signal SHUT_DOWN inputs, and U31 1 pin meets diode D32 respectively
The other end and, diode D33 one end and resistance R32 one end.The limiter diode D31 other end and resistance R31's is another
One end is grounded.Optocoupler TLP521 is U32, and U32 1 pin connects 3V voltages, and U32 2 pin are signal CLR_PEAK inputs, U32
3 pin connecting resistance R34, U32 4 pin ground connection.Diode D33 another terminating resistor R33 one end.The resistance R33 other end
The connecting resistance R34 other end, polar capacitor CD31 one end, electric capacity C31 one end, resistance R35 one end and as signal
Signal_2 output end.The resistance R32 other end, the polar capacitor CD31 other end, electric capacity the C31 other end and resistance
The R35 other end is all grounded.
Reference picture 4, first arrival detection unit use comparator TLV3502 and XOR gate logic level translator
SN74LV1T86.Comparator TLV3502 has two passages, and the comparison voltage of passage one is arranged to Vref1, the comparison of passage two
Voltage is arranged to Vref2, two comparison reference voltages are symmetrical on echo-signal relative zero, ultrasonic echo amplified signal point
Not Shu Ru two-way comparator, caused square-wave signal passes through time of lower edge on the square wave obtained by XOR gate SN74LV1T86 and is
The flight time T of Mintrop wave arrival can be calculated.Its chips TLV3502 is that U41 is to be integrated to be respectively by two comparators
U41_A and U41_B, U41 8 pin meet 3V, and U41 5 pin ground connection, U41 2 pin are signal DAC_1 inputs while and resistance
R41 one end is connected with electric capacity C41 one end, and U41 1 pin and 3 pin connect diode D41 one end and resistance R42 one end,
U41 4 pin are signal DAC_2 inputs while are connected with resistance R43 one end and electric capacity C42 one end that U41 7 pin connect
U42 1 pin, U41 6 pin connect U42 2 pin.The resistance R41 other end, the resistance R42 other end, the resistance R43 other end,
The electric capacity R41 other end and electric capacity R42 other end ground connection.The diode D41 other end is signal Signal_1 input.
XOR gate logic level translator SN74LV1T86 is U42, and U42 5 pin meet 3V, and U42 3 pin ground connection, U42 4 pin are signals
Signal_3 output end.
Reference picture 5, single machine unit use 16 I of single-chip microcomputer MSP430FG437 and four road rail-to-rails2C is inputted
DAC8574.The reference voltage DAC_1, the reference voltage DAC_ of comparator 2 of single-chip microcomputer control DAC8574 difference output comparators 1
The 2 and control voltage V of variable gain amplifierG, single-chip microcomputer receives peak signal and Mintrop wave signal, exports enable signal and peak
It is worth reset signal.Single-chip microcomputer MSP430FG437 is U51, and U51 46-50 pin connect U52 14 pin respectively, 13 pin, 11 pin, 10
Pin and 9 pin, U51 66 pin are enable signal SHUT_DOWN output ends, and U51 65 pin are peak value reset signal CLR_PEAK
Output end, U51 95 pin are peak signal Signal_2 inputs, and U51 87 pin are the defeated of Mintrop wave signal Signal_3
Enter end.DAC8574 is U52, and U52 3 pin and 4 pin connect 3V power supplys, U52 5 pin and 6 pin ground connection, and U52 1 pin is signal DAC_1
Output end, U52 2 pin are signal DAC_2 output ends, and U52 7 pin are signal VGOutput end.
Reference picture 6, multiplication factor of the signal received Jing Guo initial setting up carry out signal amplification, then carry out Mintrop wave inspection
Survey judges whether to receive Mintrop wave, enables peak detection unit if receiving Mintrop wave signal, carries out AD and samples to obtain Vpeak, sentence
Disconnected VpeakWhether in [Vmin , Vmax] in section, if in section according to the rising edge of first arrival detection element output signal and under
Drop calculates the Mintrop wave zero crossing time along the time；If not judge VpeakWhether V is more thanmaxIf then reducing multiplication factor, if not
It is to increase multiplication factor.
Reference picture 7, two are being set respectively on the symmetrical threshold point 1 of echo-signal relative zero and threshold point 2, then is being divided
2 two groups of square-wave signals of comparison signal 1 and comparison signal can not be obtained, comparison signal 1 and comparison signal 2 are subjected to XOR and then may be used
To obtain XOR signal, Mintrop wave signal is formed by first rising edge and second trailing edge, then can be arrived according to pumping signal
The rising time T of Mintrop wave signal1With the trailing edge time T of pumping signal to Mintrop wave2Mintrop wave zero crossing time T can be calculated.
The utility model is by the peak value measurement to echo-signal and controls multiplication factor, to ensure the echo measured every time
Signal is consistent, reduces multiplication factor change to waveform influence by first arrival detection, improves the repeatability and accuracy of measurement；Together
Shi Liyong first arrival detections, to judge whether to receive echo, peak detection unit is controlled, reduces the power consumption of whole circuit.
Claims (1)
1. low-consumption ultrasonic flow measurement meter echo signal processing circuit, it is characterised in that：It includes variable gain amplifying unit, peak
It is worth detection unit, first arrival detection unit and single machine unit；Ultrasound signal receipt sensor connects variable gain amplification respectively
Two inputs of variable gain amplifier in unit, signal output part and the variable gain amplifying unit of variable gain amplifier
The positive input of middle operational amplifier connects, and numeral turns in the gain-controlled voltage and single machine unit of variable gain amplifier
The third channel connection of analog circuit；The positive input terminal phase of the signal output part of variable gain amplifying unit and peak detection unit
Connection, peak detection unit enable signal are connected with single-chip processor i/o mouth in single machine unit, the output signal of peak detection unit
It is connected with single-chip processor i/o mouth；Two-way comparator in the signal output part and first arrival detection unit of variable gain amplifying unit is just
Input connects, and two-way comparator negative input end turns the first passage of analog circuit with numeral respectively and second channel is connected, first
Single-chip processor i/o mouth connection in the signal output part and single machine unit of ripple detection unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720786356.1U CN206905826U (en) | 2017-07-02 | 2017-07-02 | Low-consumption ultrasonic flow measurement meter echo signal processing circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720786356.1U CN206905826U (en) | 2017-07-02 | 2017-07-02 | Low-consumption ultrasonic flow measurement meter echo signal processing circuit |
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| CN206905826U true CN206905826U (en) | 2018-01-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548578A (en) * | 2018-03-29 | 2018-09-18 | 中国计量大学 | A kind of ultrasonic echo signal characteristic peak recognition methods based on adaptive threshold |
| CN117168583A (en) * | 2023-10-31 | 2023-12-05 | 成都千嘉科技股份有限公司 | Zero-crossing detection method and detection device for gas meter |
-
2017
- 2017-07-02 CN CN201720786356.1U patent/CN206905826U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108548578A (en) * | 2018-03-29 | 2018-09-18 | 中国计量大学 | A kind of ultrasonic echo signal characteristic peak recognition methods based on adaptive threshold |
| CN108548578B (en) * | 2018-03-29 | 2020-01-03 | 中国计量大学 | Ultrasonic echo signal characteristic peak identification method based on self-adaptive threshold |
| CN117168583A (en) * | 2023-10-31 | 2023-12-05 | 成都千嘉科技股份有限公司 | Zero-crossing detection method and detection device for gas meter |
| CN117168583B (en) * | 2023-10-31 | 2024-01-23 | 成都千嘉科技股份有限公司 | Zero-crossing detection method and detection device for gas meter |
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