CN102136182B - Signal processing system of stress vortex street flowmeter based on instrument amplifier - Google Patents
Signal processing system of stress vortex street flowmeter based on instrument amplifier Download PDFInfo
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Abstract
The invention relates to a signal processing system of a stress vortex street flowmeter based on an instrument amplifier. What the system comprise are as follows: the output of a fluid vortex street detecting element of the vortex street flowmeter is connected with a prime amplifier; the output of the prime amplifier is connected with a filter; and the output of the filter is connected with a signal postprocessor. The system is characterized in that: an instrument amplifier is used as the prime amplifier; a band-pass filter with a high-pass corner frequency FH and a low-pass corner frequency FL controlled and changed by a digital signal operator is used as the filter; a signal X0 generated by the fluid vortex street detecting element is inputted to the instrument amplifier; then a signal X1 is outputted by the instrument amplifier to the band-pass filter; a signal Y1 is outputted by the band-pass filter to the signal postprocessor; and a pulse signal or data Y2 representing fluid vortex street frequency is outputted by the signal postprocessor. The system not only can eliminate noise interference except measuring frequencies, but also can lead the instrument to realize digitized setting function in matching operations.
Description
Technical field
The present invention relates to a kind of stress-type vortex street flowmeter signal processing system, particularly a kind of stress-type vortex street flowmeter signal processing system based on instrument amplifier.
Background technology
The maximum vortex shedding flow meter product of current application amount is a stress-type vortex street flowmeter.Especially; The detecting element that stress-type vortex street flowmeter adopts all is a piezoelectric element; Consider the factor such as high internal resistance and output line cable capacitance of piezoelectric element; In order to reduce the influence that actual noise is disturbed, all adopt the prime amplifier of charge amplifier, and be regarded as a current techique scheme as the stress-type vortex street flowmeter signal processing system." vortex shedding flow meter " 201 ~ 210 pages like Sinopec publishing house publication in 2006; Like the United States Patent (USP) 5942696 and the 6480812B1 of Rosemount company and Yokogawa company, as at Chinese patent CN101614566A, CN101644590A and CN1912551 etc.
Along with popularizing of modern digital intellectualized technology comprehensively; The intellectuality of flow instrument and the commercialization signal processing system of universal demand flux of vortex street instrument can be easily carried out supportingly with all size vortex shedding flow meter, and this all will face some difficult technologies problems for the signal processing system that adopts charge amplifier.The charge amplifier of the supporting piezoelectric type detecting element of stress-type vortex street flowmeter is an amplifier with bandpass shape, and needs the big parameter resistance and the electric capacity of some high requirement.Because it is all inequality that the detecting element of different size vortex shedding flow meter is exported the frequency range of effective vortex signal, so the vortex shedding flow meter of different size requires the electric capacity and the resistance parameter of charge amplifier all different.But; The resistance and the electric capacity that change big parameter adopt devices such as general analog switch or digital regulation resistance all to be difficult to be suitable for; Therefore except the dedicated devices that adopts special exploitation; Most products have all adopted the flat manual mode of operation who pushes the pass aside to switch resistance and the electric capacity that changes charge amplifier, to realize supporting to all size vortex shedding flow meter.This has brought technical obstacle for flow instrument in the supporting operational intellectuality of instrument.
Summary of the invention
The purpose of this invention is to provide a kind of stress-type vortex street flowmeter signal processing system based on instrument amplifier; Both can mate the high internal resistance of piezoelectric element and overcome actual noise and disturb, and make the stress-type vortex street flowmeter signal processing system realize the supporting operation of digitizing again in supporting all size flux of vortex street timing.And adopt the outstanding general-purpose devices of performance such as instrument amplifier and digital regulation resistance technically, the present invention can be had realize simple and the low advantage of cost.
For achieving the above object, design of the present invention is: adopt general instrument amplifier as prime amplifier, directly solve the high internal resistance problem of joint detection element.The resistance value and the described detecting element internal resistance value that on instrument amplifier two input ends, respectively connect simultaneously resistance R 0, the 2 * R0 on an other end connection signal reference ground are close, and make instrument amplifier be operated in the higher state of signal to noise ratio (S/N ratio).The output of instrument amplifier has connected a high pass corner frequency FH and low pass corner frequency FL more all by the BPF. of Digital Signals; The special survey frequency noise in addition of eliminating is to improve the signal Processing level; And pass through high pass corner frequency FH and the low pass corner frequency FL that a digital signal operation unit controls changes BPF., make instrument in supporting operation, realize the function that digitizing is provided with.
According to the design of foregoing invention, the present invention adopts following technical scheme:
A kind of stress-type vortex street flowmeter signal processing system based on instrument amplifier; The output that comprises the fluid vortex street detecting element of a vortex shedding flow meter is connected to prime amplifier; The output of prime amplifier is connected to wave filter; The output of wave filter is connected to the signal post-processing device, it is characterized in that described prime amplifier is an instrument amplifier; Described wave filter is the BPF. that a high pass corner frequency FH and low pass corner frequency FL are controlled and changed by a digital signal operation device; The signal X0 that is produced by fluid vortex street detecting element is input to instrument amplifier; Instrument amplifier output signal X1 is to BPF.; BPF. output signal Y1 give the signal post-processing device, and the pulse signal or the data Y 2 of fluid vortex street frequency represented in the output of signal post-processing device.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier; The signal of described stress-type vortex street flowmeter amplifies and filtering system; It is characterized in that respectively connecting on two input ends of described instrument amplifier resistance value and the described detecting element internal resistance value that an other end connects resistance R 0, the 2 * R0 on signal reference ground is close.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier; Described BPF. is made up of one or more numerical control tape bandpass filters that can be changed low pass corner frequency FL and high pass corner frequency FH by the resistance value of digital regulation resistance; The resistance value of digital regulation resistance in digital signal operation device output digital signal D control BPF. makes low pass corner frequency FL and the high pass corner frequency FH of BPF. change to the Frequency point to upon request.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier; Described BPF. can be composed in series by a numerical control BPF. first and a numerical control BPF. second; Numerical control tape bandpass filter first and numerical control tape bandpass filter second have digital regulation resistance first and digital regulation resistance third to change low pass corner frequency FL separately respectively, and numerical control tape bandpass filter first and numerical control tape bandpass filter second have digital regulation resistance second and digital regulation resistance fourth to change high pass corner frequency FH separately respectively; The digital port d of the digital signal DL among the digital signal manipulater output digital signal D digital regulation resistance first and digital regulation resistance third in the BPF. changes the low pass corner frequency FL of BPF. through the resistance value of change digital regulation resistance first and digital regulation resistance third; The digital port d of digital regulation resistance second and digital regulation resistance fourth in the digital signal DH control BPF. among the digital signal manipulater output digital signal D changes the high pass corner frequency FH of BPF. through the resistance value of change digital regulation resistance second and digital regulation resistance fourth.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier, the structure of numerical control tape bandpass filter first and numerical control tape bandpass filter second is following in the described BPF.:
(a). numerical control tape bandpass filter first is by the digital regulation resistance first of variable resistance type and digital regulation resistance second, electric capacity first and the electric capacity second of variable resistance type, and amplifier first and amplifier second are formed; The resistance value RL1 of digital regulation resistance first and digital regulation resistance second and RH1 are respectively by digital signal DL and the control break of digital signal DH institute among the digital signal manipulater output digital signal D; Described signal X1 is connected to an end of digital regulation resistance first; The other end of digital regulation resistance first connects an end of electric capacity first and the input end of amplifier first; The other end of electric capacity first connects signal reference ground, and the output of amplifier first connects an end of electric capacity second, and the other end of electric capacity second connects an end of digital regulation resistance second and the input end of amplifier second; The other end of digital regulation resistance second connects signal reference ground, the output signal X2 of amplifier second;
(b). numerical control tape bandpass filter second is by digital regulation resistance fourth, electric capacity third and the electric capacity fourth of the digital regulation resistance third and the variable resistance type of variable resistance type, and amplifier third is formed with the amplifier fourth; The resistance value RL2 of digital regulation resistance third and digital regulation resistance fourth and RH2 are respectively by digital signal DL and the control break of digital signal DH institute among the digital signal manipulater output digital signal D; Described signal X2 is connected to an end of digital regulation resistance third; The other end of digital regulation resistance third connects an end of electric capacity third and the input end of amplifier third; The other end of electric capacity third connects signal reference ground, and the output of amplifier third connects an end of electric capacity fourth, and the other end of electric capacity fourth connects an end of digital regulation resistance fourth and the input end of amplifier fourth; The other end of digital regulation resistance fourth connects signal reference ground, the output signal Y1 of amplifier fourth.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier, described signal post-processing device are unit that said signal Y1 waveform is carried out shaping, and the pulse signal or the data Y 2 of fluid vortex street frequency information are represented in output.
The present invention compared with prior art has following conspicuous outstanding substantive distinguishing features and remarkable advantage:
General instrument amplifier and digital regulation resistance chip have been adopted in the system; And disposed and to have made the noise that not only can eliminate beyond the survey frequency can make instrument in supporting operation, realize the function that digitizing is provided with again by the BPF. of Digital Signals high pass corner frequency FH and low pass corner frequency FL.
Description of drawings
Fig. 1 is the structural principle block diagram of one embodiment of the present of invention.
Fig. 2 is a kind of embodiment schematic diagram of BPF. 3 and numerical control tape bandpass filter first thereof 3.1 and numerical control tape bandpass filter second 3.2 among Fig. 1.
Embodiment
The preferred embodiments of the present invention such as following: referring to Fig. 1 and Fig. 2.
Embodiment one:
A kind of stress-type vortex street flowmeter signal processing system based on instrument amplifier; Be input to the prime amplifier of an instrument amplifier 2 like Fig. 1 by the signal X0 that the fluid vortex street detecting element of vortex shedding flow meter 1 produces as system; It is that a high pass corner frequency FH and low pass corner frequency FL are by 4 BPF.s of controlling and changing 3 of a digital signal operation device that the output signal X1 of instrument amplifier 2 is input to; BPF. 3 output signal Y1 are input to signal post-processing device 5, and the pulse signal or the data Y 2 of fluid vortex street frequency represented in 5 outputs of signal post-processing device.
Embodiment two:
Present embodiment and embodiment one are basic identical, and special feature is following:
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier; Respectively connect the resistance R 0 that an other end connects signal reference ground on two input ends of described instrument amplifier 2; The resistance value of 2 * R0 and described detecting element 1 internal resistance value are close, to improve the signal to noise ratio (S/N ratio) of instrument amplifier 2 processing signals X0.
Usually, modern general purpose instrument amplifier all has very high input impedance, generally can use like general purpose instrument amplifiers such as INA116 and INA122 as instrument amplifier described here 2.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier; Described BPF. 3 is made up of one or more numerical control tape bandpass filters that can be changed low pass corner frequency FL and high pass corner frequency FH by the resistance value of digital regulation resistance; The resistance value of digital regulation resistance in the described digital signal manipulater 4 output digital signal D control BPF.s 3 makes low pass corner frequency FL and the high pass corner frequency FH of BPF. 3 change to the Frequency point to upon request.Like Fig. 2; BPF. 3 is composed in series by the numerical control tape bandpass filter first 3.1 of a single order and the numerical control tape bandpass filter second 3.2 of single order; Numerical control tape bandpass filter first 3.1 has digital regulation resistance first 3.10 and digital regulation resistance third 3.20 to change low pass corner frequency FL separately respectively with numerical control tape bandpass filter second 3.2, and numerical control tape bandpass filter first 3.1 has digital regulation resistance second 3.14 and digital regulation resistance fourth 3.24 to change high pass corner frequency FH separately respectively with numerical control tape bandpass filter second 3.2.
According to the principle of vortex shedding flow meter, the measuring tube bore is different different with gas with the liquid of detected fluid, the scope of corresponding vortex street frequency be different.The signal processing system of vortex shedding flow meter be will according to supporting vortex shedding flow meter specification; The high pass corner frequency FH of change system and low pass corner frequency FL; Make system can filter away the signal beyond the survey frequency, to eliminate the measurement level that noise improves the vortex street frequency.
Here, digital signal manipulater 4 can according to the specification of supporting vortex shedding flow meter, the digital signal D through output makes the low pass corner frequency FL of BPF. 3 and high pass corner frequency FH be operated in the reasonable frequency point.And can make instrument in supporting operation, realize the function that digitizing is provided with.
In present intelligent vortex shedding flow meter, digitizing demonstration and data that the digital signal manipulater 4 among Fig. 2 just is based on microprocessor usually are provided with panel.
Among Fig. 2; The digital port d of the digital signal DL among the digital signal manipulater 3 output digital signal D digital regulation resistance first 3.10 and digital regulation resistance third 3.20 in the BPF. 3 changes the low pass corner frequency FL of BPF. 3 through the resistance value that changes digital regulation resistance first 3.10 and digital regulation resistance third 3.20; The digital port d of digital regulation resistance second 3.14 and digital regulation resistance fourth 3.24 in the digital signal DH control BPF. 3 among the digital signal manipulater 3 output digital signal D is through changing the high pass corner frequency FH that digital regulation resistance second 3.14 and the resistance value of digital regulation resistance fourth 3.24 change BPF. 3.
Because the specification of vortex shedding flow meter is many, the variation range of the high pass corner frequency FH of requirement and low pass corner frequency FL is also than broad.The maximum resistance of the digital regulation resistance that is usually adopted otherwise less than 100K Ω, and have the tap 128 or more, could realize the setting of desired low pass corner frequency FL and high pass corner frequency FH frequency of operation point to the vortex shedding flow meter specification of using always.Digital regulation resistance chip with such performance is also a lot, like digital regulation resistance chips such as the MCP42100-I/P of MICROCHIP company and INTERSIL company and X9258TS241-2.7.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier, the composition structure of numerical control tape bandpass filter first 3.1 and numerical control tape bandpass filter second 3.2 is following in the described BPF. 3:
(a). numerical control tape bandpass filter first 3.1 is by the digital regulation resistance first 3.10 of variable resistance type and digital regulation resistance second 3.14, electric capacity first 3.11 and the electric capacity second 3.13 of variable resistance type, and amplifier first 3.12 is formed with amplifier second 3.15; The resistance value RL1 of digital regulation resistance first 3.10 and digital regulation resistance second 3.14 and RH1 are respectively by digital signal DL and the control break of digital signal DH institute among the digital signal manipulater 4 output digital signal D; Described signal X1 is connected to an end of digital regulation resistance first 3.10; The other end of digital regulation resistance first 3.10 connects an end of electric capacity first 3.11 and the input end of amplifier first 3.12; The other end of electric capacity first 3.11 connects signal reference ground; The output of amplifier first 3.12 connects an end of electric capacity second 3.13; The other end of electric capacity second 3.13 connects an end of digital regulation resistance second 3.14 and the input end of amplifier second 3.15, and the other end of digital regulation resistance second 3.14 connects signal reference ground, the output signal X2 of amplifier second 3.15;
(b). numerical control tape bandpass filter second 3.2 is by digital regulation resistance fourth 3.24, electric capacity third 3.21 and the electric capacity fourth 3.23 of the digital regulation resistance third 3.20 and the variable resistance type of variable resistance type, and amplifier third 3.22 is formed with amplifier fourth 3.25; The resistance value RL2 of digital regulation resistance third 3.20 and digital regulation resistance fourth 3.24 and RH2 are respectively by digital signal DL and the control break of digital signal DH institute among the digital signal manipulater 4 output digital signal D; Described signal X2 is connected to an end of digital regulation resistance third 3.20; The other end of digital regulation resistance third 3.20 connects an end of electric capacity third 3.21 and the input end of amplifier third 3.22; The other end of electric capacity third 3.21 connects signal reference ground; The output of amplifier third 3.22 connects an end of electric capacity fourth 3.23; The other end of electric capacity fourth 3.23 connects an end of digital regulation resistance fourth 3.24 and the input end of amplifier fourth 3.25, and the other end of digital regulation resistance fourth 3.24 connects signal reference ground, the output signal Y1 of amplifier fourth 3.25.
If the capacitance of electric capacity first 3.11, electric capacity second 3.13, electric capacity third 3.21 and electric capacity fourth 3.23 is respectively CL1, CH1, CL2 and CH2; Resistance value RL1, RH1, RL2 and the RH2 of then corresponding digital regulation resistance first 3.10, digital regulation resistance second 3.14, digital regulation resistance third 3.20 and digital regulation resistance fourth 3.24, product RL1 * CL1 and product RH1 * CH1 have confirmed the low pass corner frequency FL and the high pass corner frequency FH of numerical control tape bandpass filter first 3.1.Product RL2 * CL2 and product RH2 * CH2 have confirmed the low pass corner frequency FL and the high pass corner frequency FH of numerical control tape bandpass filter second 3.2.
Among Fig. 2, can make CL1=CL2 and CH1=CH2 here, as long as digital regulation resistance first 3.10 is identical with digital regulation resistance third 3.20, digital regulation resistance second 3.14 is identical with digital regulation resistance fourth 3.24.So, the digital signal DL among the digital signal manipulater 4 output digital signal D can change the low pass corner frequency FL of numerical control tape bandpass filter first 3.1 and numerical control tape bandpass filter second 3.2 simultaneously; Equally, the digital signal DH among the digital signal manipulater 3 output digital signal D can change the high pass corner frequency FH of numerical control tape bandpass filter first 3.1 and numerical control tape bandpass filter second 3.2 simultaneously.Noise beyond the unified elimination survey frequency with make instrument in supporting operation, realize the function of digitizing setting.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier need have certain enlargement factor to signal X0 at supporting concrete vortex shedding flow meter usually.Instrument amplifier 2 among Fig. 1 can be realized changing or the fixed signal enlargement factor easily, can conveniently realize 5 ~ 10000 signal amplification factor like general purpose instrument amplifiers such as INA122.Simultaneously, the amplifier first 3.12 among Fig. 2, amplifier second 3.15, amplifier third 3.22 and amplifier fourth 3.25 can adopt common in-phase amplifier form to realize desired signal amplifying function.
Above-mentioned stress-type vortex street flowmeter signal processing system based on instrument amplifier, described signal post-processing device 5 are unit that said signal Y1 waveform carried out processing such as shaping, and the pulse signal or the data Y 2 of fluid vortex street frequency information are represented in output.Corresponding diagram 1; Signal post-processing device 5 the most simply can be a common diode limiting and schmidt trigger shaping circuit, the mode of some realizations of introduction in 212 ~ 217 pages and 244 ~ 270 pages of " vortex shedding flow meters " published like Sinopec publishing house in 2006.It also can be a digital signal processing unit that has special ability.
Claims (2)
1. stress-type vortex street flowmeter signal processing system based on instrument amplifier; The output that comprises the fluid vortex street detecting element (1) of a vortex shedding flow meter is connected to prime amplifier; The output of prime amplifier is connected to wave filter, and wave filter is connected to the signal post-processing device; It is characterized in that described prime amplifier is an instrument amplifier (2); Described wave filter is the BPF. (3) that a high pass corner frequency FH and low pass corner frequency FL are controlled and changed by a digital signal operation device (4); The signal X0 that is produced by fluid vortex street detecting element (1) is input to instrument amplifier (2); Instrument amplifier (2) output signal X1 is to BPF. (3); BPF. (3) output signal Y1 give signal post-processing device (5), and the pulse signal or the data Y 2 of fluid vortex street frequency represented in signal post-processing device (5) output;
The resistance value and described detecting element (1) internal resistance value that respectively connect resistance R 0, the 2 * R0 on an other end connection signal reference ground on two input ends of described instrument amplifier (2) are close;
Described BPF. (3) is made up of the numerical control tape bandpass filter that one or more resistance values by digital regulation resistance change low pass corner frequency FL and high pass corner frequency FH; The resistance value of digital regulation resistance in a digital signal operation device (4) the output digital signal D control BPF. (3) makes low pass corner frequency FL and the high pass corner frequency FH of BPF. (3) change to the Frequency point to upon request;
Described BPF. (3) is composed in series by a numerical control BPF. first (3.1) and a numerical control BPF. second (3.2); Numerical control tape bandpass filter first (3.1) and numerical control tape bandpass filter second (3.2) have digital regulation resistance first (3.10) and digital regulation resistance third (3.20) to change low pass corner frequency FL separately respectively, and numerical control tape bandpass filter first (3.1) and numerical control tape bandpass filter second (3.2) have digital regulation resistance second (3.14) and digital regulation resistance fourth (3.24) to change high pass corner frequency FH separately respectively; Digital signal DL among digital signal manipulater (4) the output digital signal D changes the low pass corner frequency FL of BPF. (3) to the digital port d of middle digital regulation resistance first (3.10) of BPF. (3) and digital regulation resistance third (3.20) through the resistance value that changes digital regulation resistance first (3.10) and digital regulation resistance third (3.20); Digital signal DH among digital signal manipulater (4) the output digital signal D controls the digital port d of middle digital regulation resistance second (3.14) of BPF. (3) and digital regulation resistance fourth (3.24), changes the high pass corner frequency FH of BPF. (3) through the resistance value that changes digital regulation resistance second (3.14) and digital regulation resistance fourth (3.24);
Described signal post-processing device (5) is a unit that said signal Y1 waveform is carried out shaping, and the pulse signal or the data Y 2 of fluid vortex street frequency information are represented in output.
2. the stress-type vortex street flowmeter signal processing system based on instrument amplifier according to claim 1 is characterized in that the structure of middle numerical control tape bandpass filter first (3.1) of described BPF. (3) and numerical control tape bandpass filter second (3.2) is following:
(a). numerical control tape bandpass filter first (3.1) is by the digital regulation resistance first (3.10) of variable resistance type and digital regulation resistance second (3.14), electric capacity first (3.11) and the electric capacity second (3.13) of variable resistance type, and amplifier first (3.12) and amplifier second (3.15) are formed; The resistance value RL1 of digital regulation resistance first (3.10) and digital regulation resistance second (3.14) and RH1 are respectively by digital signal DL and the control break of digital signal DH institute among digital signal manipulater (4) the output digital signal D; Described signal X1 is connected to an end of digital regulation resistance first (3.10); The other end of digital regulation resistance first (3.10) connects an end of electric capacity first (3.11) and the input end of amplifier first (3.12); The other end of electric capacity first (3.11) connects signal reference ground; The output of amplifier first (3.12) connects an end of electric capacity second (3.13); The other end of electric capacity second (3.13) connects an end of digital regulation resistance second (3.14) and the input end of amplifier second (3.15), and the other end of digital regulation resistance second (3.14) connects signal reference ground, the output signal X2 of amplifier second (3.15);
(b). numerical control tape bandpass filter second (3.2) is by digital regulation resistance fourth (3.24), electric capacity third (3.21) and the electric capacity fourth (3.23) of the digital regulation resistance third (3.20) and the variable resistance type of variable resistance type, and amplifier third (3.22) and amplifier fourth (3.25) are formed; The resistance value RL2 of digital regulation resistance third (3.20) and digital regulation resistance fourth (3.24) and RH2 are respectively by digital signal DL and the control break of digital signal DH institute among digital signal manipulater (4) the output digital signal D; Described signal X2 is connected to an end of digital regulation resistance third (3.20); The other end of digital regulation resistance third (3.20) connects an end of electric capacity third (3.21) and the input end of amplifier third (3.22); The other end of electric capacity third (3.21) connects signal reference ground; The output of amplifier third (3.22) connects an end of electric capacity fourth (3.23); The other end of electric capacity fourth (3.23) connects an end of digital regulation resistance fourth (3.24) and the input end of amplifier fourth (3.25), and the other end of digital regulation resistance fourth (3.24) connects signal reference ground, the output signal Y1 of amplifier fourth (3.25).
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| CN 201110069492 CN102136182B (en) | 2011-03-23 | 2011-03-23 | Signal processing system of stress vortex street flowmeter based on instrument amplifier |
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| CN 201110069492 CN102136182B (en) | 2011-03-23 | 2011-03-23 | Signal processing system of stress vortex street flowmeter based on instrument amplifier |
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| CN102136182B true CN102136182B (en) | 2012-12-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090518U (en) * | 1991-05-08 | 1991-12-11 | 青岛自动化仪表厂 | Stress type vortex street flow transmitter |
| CN101162162A (en) * | 2007-11-14 | 2008-04-16 | 合肥工业大学 | Low-power consumption two-wire system vortex flowmeter |
| CN101451864A (en) * | 2008-12-22 | 2009-06-10 | 合肥工业大学 | Improved low power consumption two-wire system vortex shedding flowmeter |
-
2011
- 2011-03-23 CN CN 201110069492 patent/CN102136182B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2090518U (en) * | 1991-05-08 | 1991-12-11 | 青岛自动化仪表厂 | Stress type vortex street flow transmitter |
| CN101162162A (en) * | 2007-11-14 | 2008-04-16 | 合肥工业大学 | Low-power consumption two-wire system vortex flowmeter |
| CN101451864A (en) * | 2008-12-22 | 2009-06-10 | 合肥工业大学 | Improved low power consumption two-wire system vortex shedding flowmeter |
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Free format text: CORRECT: INVENTOR; FROM: LI BIN CHEN JIE ZOU HENGCHAO REN WEICONG ZHONG GUANGYUAN TO: LI BIN CHEN JIE ZOU HENGCHAO REN WEICONG ZHONG LIYUAN |
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Granted publication date: 20121219 |