CN201983810U - Output frequency measurement circuit of turbine flow sensor - Google Patents
Output frequency measurement circuit of turbine flow sensor Download PDFInfo
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- CN201983810U CN201983810U CN 201020701314 CN201020701314U CN201983810U CN 201983810 U CN201983810 U CN 201983810U CN 201020701314 CN201020701314 CN 201020701314 CN 201020701314 U CN201020701314 U CN 201020701314U CN 201983810 U CN201983810 U CN 201983810U
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Abstract
The utility model belongs to the flow measuring technology, and relates to an improvement on an output frequency measurement circuit of a turbine flow sensor. The output frequency measurement circuit comprises a turbine flow sensor P, and is characterized by comprising the turbine flow sensor P, an integral part pretreatment circuit [1], a decimal part pretreatment circuit [2] and a singlechip circuit [3], wherein the integral part pretreatment circuit [1] comprises a triode T, a photoelectric isolation device U1, a door U2, resistors R1 and R2, a capacitor C1 and a diode D1; and the decimal part pretreatment circuit [2] comprises resistors R3, R4, R5, and R6, a capacitor C2, an operational amplifier U3 and a door U4. The output frequency measurement circuit greatly improves the flow measuring precision for the turbine flow sensor, and meets the measurement requirement for instantaneous flow rate of a novel engine spray nozzle.
Description
Technical field
The utility model belongs to flow measurement technology, relates to the improvement to turbine flow transducer output frequency metering circuit.
Background technology
The measurement mechanism of present aeromotor nozzle instantaneous delivery, adopt turbine flow transducer to provide sine or the square-wave signal of representing flow, metering circuit is the pure digi-tal logical circuit, sine or square-wave signal to turbine flow transducer output in the thresholding of regulation count to get frequency values, then frequency values are converted into flow value.Its shortcoming is: the flow measurement precision is not high, can not satisfy the accuracy requirement of new work engine flow measurement.Specifically, at first, the frequency measurement circuit of existing measurement mechanism can not guarantee that the initial moment of thresholding is synchronous with the initial moment of signal, thereby produces counting error; Secondly, can't measure for the remaining waveform of last signal period, thereby ignore fraction part, cause the flow measurement error.
Summary of the invention
The purpose of this utility model is: propose a kind of turbine flow transducer output frequency metering circuit that can improve the flow measurement precision, to satisfy the measurement needs of new work engine nozzle instantaneous delivery.
The technical solution of the utility model is: turbine flow transducer output frequency metering circuit, comprise a turbine flow transducer P, it is characterized in that turbine flow transducer output frequency metering circuit is made up of turbine flow transducer P, integral part pre-process circuit and single chip circuit;
(1) integral part pre-process circuit 1 is by triode T, photoisolator U1, form with a door U2, resistance R 1 and R2, capacitor C 1 and diode D1; Be connected with the base stage of triode T behind the signal output part P1 resistance in series R1 of turbine flow transducer P, the earth terminal P2 ground connection of turbine flow transducer P, the power input P3 of turbine flow transducer P is connected with+24V, one end of resistance R 2, one end of capacitor C 1 is connected with the base stage of triode T with the negative pole of diode D1, the other end of resistance R 2, the plus earth of the other end of capacitor C 1 and diode D1, the grounded emitter of triode T, the collector of triode T is connected with the signal input part of photoisolator U1, the power input of photoisolator U1 is connected with+24V, the earth terminal ground connection of photoisolator U1, the signal output part of photoisolator U1 is connected with input end with door U2, with the output terminal of door U2 be the output terminal of integral part pre-process circuit 1;
(2) fraction part pre-process circuit 2 is by resistance R 3, R4, R5, R6, capacitor C 2, operational amplifier U3, form with a door U4; Be connected with the in-phase end of operational amplifier U3 behind the signal output part P1 resistance in series R3 of turbine flow transducer P, one end of capacitor C 2 is connected with the in-phase end of operational amplifier U3, the other end ground connection of capacitor C 2, the end of oppisite phase of one termination operational amplifier U3 of resistance R 4, the output terminal of another termination operational amplifier U3 of resistance R 4, the end of oppisite phase of one termination operational amplifier U3 of resistance R 5, the other end ground connection of resistance R 5, one end of resistance R 6 is connected with the output terminal of operational amplifier U3, the other end of resistance R 6 is connected with input end with door U4, with the output terminal of door U4 be the output terminal of fraction part pre-process circuit 2;
(2) single chip circuit 3 is made up of single-chip microcomputer U5 and high-precision crystal oscillator X, the power input VCC of single-chip microcomputer U5 is connected with+5V, the earth terminal GND ground connection of single-chip microcomputer U5, reset terminal RST termination+5V of single-chip microcomputer U5, the signal output part OSC of crystal oscillator X is connected with the input end of clock XTAL1 of single-chip microcomputer U5, the earth terminal ground connection of crystal oscillator X, the power input of crystal oscillator X is connected with+5V, the output of integral part pre-process circuit 1 is connected with the first external interrupt input end INT0 of single-chip microcomputer U5, the output of fraction part pre-process circuit 2 is connected with the second external interrupt input end INT1 of single-chip microcomputer U5, the output terminal OUT of single-chip microcomputer U5 is connected with the input end of display device, and the communication terminal TXD of single-chip microcomputer U5 is connected with communication apparatus.
The utility model has the advantages that: improved the flow measurement precision of turbine flow transducer greatly, satisfied the measurement needs of new work engine nozzle instantaneous delivery.Evidence, the utility model has improved 3 orders of magnitude with the flow measurement precision, brings up to behind the radix point the 3rd from units.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below the utility model is described in further details.Referring to Fig. 1, turbine flow transducer output frequency metering circuit, comprise a turbine flow transducer P, it is characterized in that turbine flow transducer output frequency metering circuit is made up of turbine flow transducer P, integral part pre-process circuit 1 and single chip circuit 3;
(1) integral part pre-process circuit 1 is by triode T, photoisolator U1, form with a door U2, resistance R 1 and R2, capacitor C 1 and diode D1; Be connected with the base stage of triode T behind the signal output part P1 resistance in series R1 of turbine flow transducer P, the earth terminal P2 ground connection of turbine flow transducer P, the power input P3 of turbine flow transducer P is connected with+24V, one end of resistance R 2, one end of capacitor C 1 is connected with the base stage of triode T with the negative pole of diode D1, the other end of resistance R 2, the plus earth of the other end of capacitor C 1 and diode D1, the grounded emitter of triode T, the collector of triode T is connected with the signal input part of photoisolator U1, the power input of photoisolator U1 is connected with+24V, the earth terminal ground connection of photoisolator U1, the signal output part of photoisolator U1 is connected with input end with door U2, with the output terminal of door U2 be the output terminal of integral part pre-process circuit 1;
(2) fraction part pre-process circuit 2 is by resistance R 3, R4, R5, R6, capacitor C 2, operational amplifier U3, form with a door U4; Be connected with the in-phase end of operational amplifier U3 behind the signal output part P1 resistance in series R3 of turbine flow transducer P, one end of capacitor C 2 is connected with the in-phase end of operational amplifier U3, the other end ground connection of capacitor C 2, the end of oppisite phase of one termination operational amplifier U3 of resistance R 4, the output terminal of another termination operational amplifier U3 of resistance R 4, the end of oppisite phase of one termination operational amplifier U3 of resistance R 5, the other end ground connection of resistance R 5, one end of resistance R 6 is connected with the output terminal of operational amplifier U3, the other end of resistance R 6 is connected with input end with door U4, with the output terminal of door U4 be the output terminal of fraction part pre-process circuit 2; (2) single chip circuit 3 is made up of single-chip microcomputer U5 and high-precision crystal oscillator X, the power input VCC of single-chip microcomputer U5 is connected with+5V, the earth terminal GND ground connection of single-chip microcomputer U5, reset terminal RST termination+5V of single-chip microcomputer U5, the signal output part OSC of crystal oscillator X is connected with the input end of clock XTAL1 of single-chip microcomputer U5, the earth terminal ground connection of crystal oscillator X, the power input of crystal oscillator X is connected with+5V, the output of integral part pre-process circuit 1 is connected with the first external interrupt input end INT0 of single-chip microcomputer U5, the output of fraction part pre-process circuit 2 is connected with the second external interrupt input end INT1 of single-chip microcomputer U5, the output terminal OUT of single-chip microcomputer U5 is connected with the input end of display device, and the communication terminal TXD of single-chip microcomputer U5 is connected with communication apparatus.
Principle of work of the present utility model is: the output signal of turbine flow transducer P divides two-way to enter into integral part pre-process circuit 1 and fraction part pre-process circuit 2 respectively, in integral part pre-process circuit 1, signal drives triode T by R1 and signal shaping is become square wave and drive the isolation that photoisolator U1 carries out signal, and output signal outputs to the first external interrupt input end INT0 of single-chip microcomputer U5 again after U2 buffering, shaping.In the fraction part pre-process circuit 2, signal is earlier through operational amplifier U3 amplification and by the second external interrupt input end INT1 that outputs to single-chip microcomputer U5 after U4 buffering, the shaping.
Be connected to flow that the turbine flow transducer P in the oil circuit flows the oil circuit medium and convert the square wave or the sinusoidal wave electric signal of certain amplitude, corresponding frequencies to, its frequency is between 0KHz～3KHz, and output signal frequency is directly proportional with flow.Metering circuit is counted the sine wave signal of turbine flow transducer P output in the time at the thresholding of setting, and can obtain the instantaneous delivery value.
In the utility model circuit, the principle that integral part is measured is: when beginning to measure, the initial moment that should guarantee measured signal kept synchronously with the initial moment of thresholding, in circuit, the output of flow signal integral part pre-process circuit 1 is connected with the first external interrupt input end INT0 of single-chip microcomputer U5, single-chip microcomputer U5 at first carries out the judgement of negative edge to this output signal, in the negative edge moment of measured signal, the INT that causes single-chip microcomputer immediately interrupts, enter interruption and then start counting at once sine wave signal pulse in the thresholding, till thresholding finishes, so, can finish the measurement of the integral part of frequency to measured signal in certain thresholding.
The principle that fraction part is measured is: single-chip microcomputer utilizes the clock signal incomplete pulse (being fraction part) to measured signal of high-precision crystal oscillator X to segment, and the second external interrupt input end INT1 that measures single-chip microcomputer U5 goes up the periodic quantity t of each cycle of measured signal
iAnd storage, i=1,2 ... n, in the finish time of thresholding, the time of the incomplete pulse of n cycle of measured measured signal is t
n, the periodic quantity t of a preceding n-1 pulse is averaged, obtain T average period, then the count value of the incomplete pulse of n cycle is t
n/ T, the i.e. fraction part of count value.
Among the embodiment of the present utility model, high-precision crystal oscillator X adopts the 10MHz crystal oscillator with temperature compensation, and behind 8 frequency divisions, the frequency of measuring clock is 1.25M, and promptly the time reference of Ce Lianging is 0.8 μ s.In-40～80 ℃ of scopes, the frequency stability of high-precision crystal oscillator X can reach 0.5x10
-6Ppm, single-chip microcomputer adopts ATMEGA8L, and the high speed optoelectronic isolator adopts HCPL3010.Turbine flow transducer P adopts FTO-3 or the FTO-5 from external import.
Claims (1)
1. turbine flow transducer output frequency metering circuit, comprise a turbine flow transducer P, it is characterized in that turbine flow transducer output frequency metering circuit is made up of turbine flow transducer P, integral part pre-process circuit [1] and single chip circuit [3];
(1) integral part pre-process circuit [1] is by triode T, photoisolator U1, form with a door U2, resistance R 1 and R2, capacitor C 1 and diode D1; Be connected with the base stage of triode T behind the signal output part P1 resistance in series R1 of turbine flow transducer P, the earth terminal P2 ground connection of turbine flow transducer P, the power input P3 of turbine flow transducer P is connected with+24V, one end of resistance R 2, one end of capacitor C 1 is connected with the base stage of triode T with the negative pole of diode D1, the other end of resistance R 2, the plus earth of the other end of capacitor C 1 and diode D1, the grounded emitter of triode T, the collector of triode T is connected with the signal input part of photoisolator U1, the power input of photoisolator U1 is connected with+24V, the earth terminal ground connection of photoisolator U1, the signal output part of photoisolator U1 is connected with input end with door U2, with the output terminal of door U2 be the output terminal of integral part pre-process circuit [1];
(2) fraction part pre-process circuit [2] is by resistance R 3, R4, R5, R6, capacitor C 2, operational amplifier U3, form with a door U4; Be connected with the in-phase end of operational amplifier U3 behind the signal output part P1 resistance in series R3 of turbine flow transducer P, one end of capacitor C 2 is connected with the in-phase end of operational amplifier U3, the other end ground connection of capacitor C 2, the end of oppisite phase of one termination operational amplifier U3 of resistance R 4, the output terminal of another termination operational amplifier U3 of resistance R 4, the end of oppisite phase of one termination operational amplifier U3 of resistance R 5, the other end ground connection of resistance R 5, one end of resistance R 6 is connected with the output terminal of operational amplifier U3, the other end of resistance R 6 is connected with input end with door U4, with the output terminal of door U4 be the output terminal of fraction part pre-process circuit [2];
(2) single chip circuit [3] is made up of single-chip microcomputer U5 and high-precision crystal oscillator X, the power input VCC of single-chip microcomputer U5 is connected with+5V, the earth terminal GND ground connection of single-chip microcomputer U5, reset terminal RST termination+5V of single-chip microcomputer U5, the signal output part OSC of crystal oscillator X is connected with the input end of clock XTAL1 of single-chip microcomputer U5, the earth terminal ground connection of crystal oscillator X, the power input of crystal oscillator X is connected with+5V, the output of integral part pre-process circuit [1] is connected with the first external interrupt input end INT0 of single-chip microcomputer U5, the output of fraction part pre-process circuit [2] is connected with the second external interrupt input end INT1 of single-chip microcomputer U5, the output terminal OUT of single-chip microcomputer U5 is connected with the input end of display device, and the communication terminal TXD of single-chip microcomputer U5 is connected with communication apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020701314 CN201983810U (en) | 2010-12-02 | 2010-12-31 | Output frequency measurement circuit of turbine flow sensor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010569591.6 | 2010-12-02 | ||
| CN201010569591 | 2010-12-02 | ||
| CN 201020701314 CN201983810U (en) | 2010-12-02 | 2010-12-31 | Output frequency measurement circuit of turbine flow sensor |
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| CN201983810U true CN201983810U (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201020701314 Expired - Fee Related CN201983810U (en) | 2010-12-02 | 2010-12-31 | Output frequency measurement circuit of turbine flow sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612540A (en) * | 2019-01-03 | 2019-04-12 | 中国电子科技集团公司第四十九研究所 | A kind of compensation flow-measuring method of high precision temp frequency |
| CN113884745A (en) * | 2021-10-27 | 2022-01-04 | 西安微电子技术研究所 | Alternating current signal effective value and frequency conversion device |
-
2010
- 2010-12-31 CN CN 201020701314 patent/CN201983810U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109612540A (en) * | 2019-01-03 | 2019-04-12 | 中国电子科技集团公司第四十九研究所 | A kind of compensation flow-measuring method of high precision temp frequency |
| CN113884745A (en) * | 2021-10-27 | 2022-01-04 | 西安微电子技术研究所 | Alternating current signal effective value and frequency conversion device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20141231 |
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| EXPY | Termination of patent right or utility model |