CN106123971B - Differential turbine flow sensor based on digital phase locking technology and detection method thereof - Google Patents
Differential turbine flow sensor based on digital phase locking technology and detection method thereof Download PDFInfo
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- CN106123971B CN106123971B CN201610655932.9A CN201610655932A CN106123971B CN 106123971 B CN106123971 B CN 106123971B CN 201610655932 A CN201610655932 A CN 201610655932A CN 106123971 B CN106123971 B CN 106123971B
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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Abstract
The invention discloses a turbine flow sensor based on a digital phase locking technology, which is used for measuring the flow in a pipe body, wherein an impeller is arranged in the pipe body and comprises a shell arranged on the outer wall of the pipe body, and the shell comprises a metal part and a non-metal part; a connecting through hole is formed between the metal part and the non-metal part; a detection circuit board is arranged in the metal part, and a differential sensor is arranged in the non-metal part; the detection circuit board comprises a resonant circuit module, two signal receiving modules and a digital signal processing module. The invention also discloses a turbine flow detection method based on the digital phase locking technology. The method has the characteristics of higher accuracy and lower error in turbine flow measurement.
Description
Technical field
The invention belongs to turbine flow transducer technical fields, and in particular to a kind of difference whirlpool based on digital lock-in technique
Take turns flow sensor.
Background technique
Turbine flow transducer is the instrument that a kind of pair of fluid flow measures.Compared to common flow sensor,
Turbine flow transducer has that compact mechanism, the visual and clear, high reliablity of reading, anti-lightning, that cost is relatively low etc. is more apparent
Advantage.Therefore very extensive application has also been obtained in some special sectors, such as has carried out scientific experiment, science and techniques of defence aspect, meter
Amount department etc..
The working principle of turbine flow transducer are as follows: the flow velocity of liquid is acted on into impeller first and is converted to turning for turbine
Speed, then the revolving speed of turbine is converted into the signal frequency directly proportional to fluid flow.Its practical function is the instantaneous stream of detection
Amount and accumulative total flow, the signal of output are generally square wave or the corresponding frequency of the square wave.Main part is substantially all
Using analog circuit, the less chip comprising Digital Signal Processing.
But as the development of modernized society accelerates, industrial and agricultural production is constantly progressive, and in medicine, biology etc.
Requirement on field to the accuracy of data is increasingly stringenter, and current turbine flow transducer is because be easy dry by the external world
It disturbs, therefore the precision of its detection increasingly can not meet the demand of current science and technology.Therefore, a kind of that there is higher essence
Degree and the turbine flow transducer of lower measurement error are that current society needs in a hurry.
Summary of the invention
To solve the above-mentioned problems, the first object of the present invention provides a kind of turbine flow biography based on digital lock-in technique
Sensor has the characteristics that the precision for measuring turbine flow is higher, error is lower.
To achieve the above object, the present invention is achieved by following technical scheme:
Turbine flow transducer of the present invention based on digital lock-in technique, for being surveyed to the intracorporal flow of pipe
It measures, impeller is installed in the tube body, the turbine flow transducer includes the shell for being installed on tube wall, the shell packet
Include metal portion and non-metal portion；Connection through-hole is equipped between the metal portion and the non-metal portion；It is equipped in the metal portion
Detection circuit board, the non-metal portion is interior to be equipped with differential sensor；
The detection circuit board includes:
One resonance circuit module, for generating high frequency sinusoidal resonant electrical signals；
Two signal receiving modules, for receiving the electric signal and high frequency sinusoidal resonant electrical signals of differential sensor transmission,
And be filtered, amplify after be converted to digital signal；
With a digital signal processing module, phase sensitivity is carried out for receiving the digital signal, and to the digital signal
Detection, frequency and flow rate calculation；
The output end of the resonance circuit module is connect with the input terminal of the differential sensor；The differential sensor
Output end is respectively connect with the input terminal of a signal receiving module；The output end of described two signal receiving modules with it is described
The input terminal of digital signal processing module connects；During the wheel rotation, it is corresponding by differential sensor collect with frequently,
The different two-way Low Frequency Sine Signals of phase, the high frequency that the two-way Low Frequency Sine Signals are generated with the resonance circuit module is just
String resonant electrical signals are respectively sent to signal receiving module together, the signal receiving module is filtered the electric signal,
After enhanced processing, is converted to digital signal and is sent to the digital signal processing module, the digital signal processing module should
Digital signal carries out phase-sensitive detection, frequency and flow rate calculation, obtains the liquid total flow for flowing through tube body.
Further, at least two inductive sensors side by side is equipped in the differential sensor.
Further, the signal receiving module includes filter circuit, operational amplification circuit and analog to digital conversion circuit；It is described
The output end of filter circuit is connect with the input terminal of the operational amplification circuit；The output end of the operational amplification circuit with it is described
The input terminal of analog to digital conversion circuit connects.
Further, the digital signal processing module includes two sinusoidal signal input terminals, frequency computing unit, phase shift
Unit, phase-sensitive detection unit and flow rate calculation unit；One of one sinusoidal signal input terminal and phase-sensitive detection unit is defeated
Enter end connection, another described sinusoidal signal input terminal is connect with the input terminal of the frequency computing unit；The frequency calculates
The output end of unit is connect with the input terminal of the phase-shifting unit；The output end of the phase-shifting unit and the phase-sensitive detection unit
Another input terminal connection；The output end of the phase-sensitive detection unit is connect with the flow rate calculation unit.
Further, the metal portion uses stainless steel material；The non-metal portion uses high temperature resistant, corrosion resistant material
Matter.
Further, the impeller is metal nonmagnetic body.
To solve the above-mentioned problems, the second object of the present invention provides a kind of turbine flow inspection based on digital lock-in technique
Survey method has the characteristics that measurement accuracy is higher, error is lower.
To achieve the above object, the present invention is achieved by following technical scheme:
Turbine flow detection method of the present invention based on digital lock-in technique, includes the following steps:
Obtain high frequency sinusoidal resonant electrical signals；
The high frequency sinusoidal resonant electrical signals are converted into magnetic field signal；
The magnetic field signal is passed through by the impeller that liquid flowing drives in tube body, generates low frequency magnetic field；
The low frequency magnetic field passes through differential sensor, is converted to the different Low Frequency Sine Signals of at least two phases；
The high frequency sinusoidal resonant electrical signals are together with the Low Frequency Sine Signals after signal processing, and the high frequency is just
String resonant electrical signals are filtered out, and the Low Frequency Sine Signals are converted to digital signal by filtering, amplification；
The digital signal passes through frequency calculating, phase shift calculating, phase-sensitive detection and calculating, obtains the liquid for flowing through tube body
Total flow.
Further, the digital signal passes through frequency calculating, phase shift calculating, phase-sensitive detection and calculating, obtains and flows through pipe
The step of total flow of the liquid of body, is specifically:
It digital signal will be calculated all the way by frequency first, and obtain the frequency of the digital signal, then believe by the number
Number carry out 1/4 period phase shift obtain phase shift signal；
Phase shift signal and another way digital signal are subjected to phase-sensitive detection, obtain the phase difference between two ways of digital signals；
Impeller is calculated by the time difference of inductive sensor in differential sensor, formula according to the frequency of two ways of digital signals
Specifically:
By the time difference, the revolving speed v of impeller is calculated, then calculates the total flow for flowing through the liquid of tube body.
Further, by the time difference, calculating total flow, specific step is as follows:
The revolving speed v=d/ τ of impeller is calculated, wherein d is between two inductive sensors using 53 center of impeller as the arc in the center of circle
Distance；
Calculating adopts to have time difference t between the data of the revolving speed v of impeller twice；
The flow velocity for flowing through the liquid of tube body is V/t；
Using same liquid, the flow velocity V/t of liquid and the flow velocity v of impeller are in a linear relationship, specially V/t=α v, wherein α
For the coefficient of linear relationship；
The total flow of liquid is the integral that revolving speed v passes through the time difference each time, specific formula is as follows:
V=α [v1×(t1-t0)+v2×(t2-t1)+…+vn×(tn-tn-1)]。
Compared with prior art, the beneficial effects of the present invention are:
Difference turbine flow transducer of the present invention based on digital lock-in technique realizes phase using differential sensor
Potential difference sampling and digital lock-in technique accurately calculate phase difference, instead of the whirlpool of traditional direct output square wave or frequency
Flow sensor is taken turns, the problem of turbine flow transducer is easy because of sensor by external interference is got rid of, so that feedback frequency is not
Measurement accuracy is low caused by accurate, the biggish limitation of error.
The present invention uses phase difference measurement, measures the method used and is different from traditional turbine flow transducer, can
The defect of turbine flow transducer is avoided, to substantially increase measurement accuracy and reduce measurement error.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing, in which:
Fig. 1 is the structural schematic block diagram of the turbine flow transducer of the present invention based on digital lock-in technique；
Fig. 2 is the structure of signal receiving module in the turbine flow transducer of the present invention based on digital lock-in technique
Schematic block diagram；
Fig. 3 is digital signal processing module in the turbine flow transducer of the present invention based on digital lock-in technique
Structural schematic block diagram；
Fig. 4 is the processing of phase-sensitive detection unit in the turbine flow transducer of the present invention based on digital lock-in technique
Schematic diagram；
Fig. 5 is the section signal of the present invention being connect based on the turbine flow transducer of digital lock-in technique with tube body
Figure；
Fig. 6 is the section signal that the turbine flow transducer of the present invention based on digital lock-in technique is installed on tube body
Figure；
Fig. 7 is the flow chart of the turbine flow detection method of the present invention based on digital lock-in technique.
In figure:
1: differential sensor 11: inductive sensor
2: detection circuit board 21: resonance circuit module
22: signal receiving module
221: filter circuit 222: operational amplification circuit 223: analog to digital conversion circuit
23: digital signal processing module
231: sinusoidal signal input terminal 232: frequency computing unit 233: phase-shifting unit
234: phase-sensitive detection unit 235: flow rate calculation unit
3: shell
31: metal portion 32: non-metal portion 33: connection through-hole
4: tube body 5: impeller 6: groove
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
As shown in Fig. 1~Fig. 6, the turbine flow transducer of the present invention based on digital lock-in technique, for pipe
Flow in body 4 measures, and is equipped with impeller 5 in the tube body 4.Specifically, the turbine based on digital lock-in technique
Flow sensor includes a shell 3 for being installed on 4 outer wall of tube body, and the shell 3 includes metal portion 31 and non-metal portion 32, described
Metal portion 31 is provided with non-metal portion 32 and connect through-hole 33.The material that the metal portion 31 uses is described for stainless steel material
Non-metal portion 32 is using high temperature resistant, corrosion resistant material.
It is equipped with detection circuit board 2 in the metal portion 31, is equipped with differential sensor 1 in the non-metal portion 32.
Wherein, the detection circuit board 2 includes a resonance circuit module 21, two signal receiving modules 22 and a digital signal
Processing module 23.The resonance circuit module 21 is for generating high frequency sinusoidal resonant electrical signals.The signal receiving module 22 is used
In the high frequency sinusoidal resonant electrical signals for receiving the electric signal that differential sensor 1 is sent and the generation of resonance circuit module 21, and
Be filtered, amplify after be converted to digital signal；The digital signal processing module 23 passes through signal receiving module for receiving
The digital signal of 22 processing, the calculating of phase-sensitive detection, frequency and flow is then carried out to the digital signal, finally obtains and flows through
The liquid total flow of entire tube body 4.
Wherein, two output ends of the resonance circuit module 21 are connect with two input terminals of the differential sensor 1；
Two output ends of the differential sensor 1 are respectively connect with the input terminal of a signal receiving module 22；Described two letters
The output end of number receiving module 22 is connect with the input terminal of the digital signal processing module 23；
It is corresponding that the two-way low frequency different with frequency, phase is collected by differential sensor 1 in 5 rotation process of impeller
Sinusoidal signal, the high frequency sinusoidal resonant electrical signals that the two-way Low Frequency Sine Signals are generated with the resonance circuit module 21 are together
It is respectively sent to two signal receiving modules 22, i.e. a signal receiving module 22 receives Low Frequency Sine Signals all the way and high all the way
Frequency sinusoidal resonance electric signal.The signal receiving module 22 is filtered the electric signal, after enhanced processing, is converted to number
Signal is sent to the digital signal processing module 23, which is carried out phase sensitivity inspection by the digital signal processing module 23
Survey, frequency and flow rate calculation, finally obtain the liquid total flow for flowing through tube body 4.
As shown in figure 5, the shell 3 is installed in the groove 6 of tube body 4.When the resonance circuit module in detection circuit board 2
When 21 generation high frequency sinusoidal resonant electrical signals, which is transferred to differential sensor 1, and differential sensor 1 is humorous by the high frequency sinusoidal
Vibration electric signal is converted to magnetic field signal, and magnetic field signal passes through tube body 4 and acts on metallic impeller, and because of eddy current effect and in impeller
Vortex is generated on 5.Since impeller 5 has electric current under the action of magnetic field signal, low frequency magnetic field can be generated in outside when rotating,
The magnetic field passes through tube body 4 and acts on differential sensor 1, then is converted into Low Frequency Sine Signals.
As shown in fig. 6, in the actual process, it is equipped at least two inductive sensors 11 side by side in the differential sensor 1,
Two are set as in the present embodiment.Its setting requirements is: the inductive sensor 11 need to be arranged in the circumferential direction of the impeller 5, purpose
Be: when liquid flows through impeller 5 in tube body 4, impeller 5 is driven rotation, since it is different by the time of inductive sensor 11,
The different Low Frequency Sine Signals of two-way phase can then be generated.
As shown in Fig. 2, the signal receiving module 22 has specifically included filter circuit 221, operational amplification circuit 222 and mould
Number conversion circuit 223；The input terminal of the signal receiving module 22 is the input terminal of the filter circuit 221；The filtered electrical
The output end on road 221 is connect with the input terminal of the operational amplification circuit 222；The output end of the operational amplification circuit 222 with
The input terminal of analog-digital conversion circuit as described 223 connects；The output end of analog-digital conversion circuit as described 223 is the signal receiving module
22 output end.
The filter circuit 221 receives the two paths of signals of the transmission of differential sensor 1, wherein being resonance circuit module all the way
21 issue high frequency sinusoidal resonant electrical signals and one routing impeller 5 feed back after by differential sensor 1 convert low frequency just
String signal after filtering via filter circuit 221, is then only left low frequency sinusoidal electric signal all the way.Then again by operational amplification circuit
After 22 amplifications, then by analog to digital conversion circuit 223 low frequency sinusoidal digital signal is converted by the electric signal, is sent at digital signal
Reason module 23 is further processed.In this process, another signal receiving module 22 also carries out the above operation simultaneously.
As shown in figure 3, the digital signal processing module 23 includes two sinusoidal signal input terminals 231, frequency calculating list
Member 232, phase-shifting unit 233, phase-sensitive detection unit 234 and flow rate calculation unit 235；One sinusoidal signal input terminal 231A
(in order to distinguish in Fig. 3, being then labeled as A) connect, another described sinusoidal signal with an input terminal of phase-sensitive detection unit 234
Input terminal 231B (in order to distinguish in Fig. 3, being then labeled as B) is connect with the input terminal of the frequency computing module 232；The frequency
The output end of computing unit 232 is connect with the input terminal of the phase-shifting unit 233；The output end of the phase-shifting unit 233 and institute
State another input terminal connection of phase-sensitive detection unit 234；The output end of the phase-sensitive detection unit 234 and the flow rate calculation
Unit 235 connects.
Two low frequency sinusoidal digital signal frequencies having the same and different phases, will low frequency sinusoidal digital signal all the way
It is inputted via sinusoidal signal input terminal 231B, the frequency of signal is then calculated via frequency computing unit 232, using shifting
Low frequency sinusoidal digital signal is carried out the phase shift of 1/4 period by circuitry phase 233.The signal of sinusoidal signal input terminal 231B is known as sin
(at), the signal that the signal of sinusoidal signal input terminal 231B carries out after the phase shift of 1/4 period is known as cos (at).The cos (at) letter
Number as reference signal input phase-sensitive detection unit 234 in, by the signal of another way low frequency sinusoidal digital signal input end 231A
Referred to as sin (at+ θ), as in measured signal input phase-sensitive detection unit 234.Then it is finally counted by flow rate calculation unit 235
Calculate liquid total flow.
In order to further illustrate as shown in figure 4, phase-sensitive detection unit 234 in digital signal processing module 23, was detected
Cheng Zhong has the above three road signals of input, is tested sinusoidal signal sin (at+ θ) respectively, with reference to sinusoidal signal sin (at), reference
Cosine signal cos (at), above three road signal after treatment, respectively via filter unit, quadrature component output end and same phase
Component output terminal.In the circuit, it is tested the signal that sinusoidal signal sin (at+ θ) is sinusoidal signal input terminal 231A, with reference to sine
Signal sin (at) is the signal of sinusoidal signal input terminal 231B, is sinusoidal signal input terminal 231B with reference to cosine signal cos (at)
Signal carry out the phase shift of 1/4 period after signal.By tested sinusoidal signal sin (at+ θ) respectively with reference sinusoidal signal
Sin (at), it is multiplied with reference to cosine signal cos (at).
Wherein, sinusoidal signal sin (at+ θ) is tested to be multiplied with reference to sinusoidal signal sin (at):
Tested sinusoidal signal sin (at+ θ) is multiplied with reference to cosine signal cos (at):
The signal obtained after multiplication is passed through into filter unit, the signal for obtaining quadrature component output end is cos (θ)/2, together
The signal of phase component output end is sin (θ)/2.Two signals contain sinusoidal signal input terminal 231A and sinusoidal signal input terminal
Two signals are output to the flow rate calculation module in digital signal processing module 23 by the information of the phase difference θ between 231B
In 235, sinusoidal signal input terminal 231A and sinusoidal signal input terminal can be accurately calculated by arcsin or arccos
Phase difference θ between 231B.Again because can also learn the frequencies omega of signal by frequency computing module 232, public affairs can be passed through
Formula finds out impeller 5 by the time difference of two inductive sensors 11 in differential sensor 1:
After obtaining the time difference, data on flows can be obtained by simple mathematical computations.
The method specifically used in the present embodiment is: obtain in differential sensor 1 between two inductive sensors 11 with impeller 5
Center is the arc distance d in the center of circle, therefore can obtain the revolving speed v=d/ τ of impeller 5.This turn tested further according to experience
The fluid flow in this calculating can be obtained in the relationship (generally linear relationship, coefficient of relationship α) of fast v and fluid flow
As a result, can accurately obtain liquid total flow by calculating for a long time and fluid flow result adding up.
Specifically: where the method for determination of α are as follows: by volume V (unit: m3) liquid flow through pipe using identical speed
Body 4 can obtain the revolving speed v (unit: rad/s) of impeller 5 by flowmeter, obtain using time be t (unit: s), water
Flow velocity is V/t (unit: m3/ s), by experimental verification, for same liquid, the flow velocity of water and the revolving speed v of impeller 5 are linear
Relationship, the unit that can be expressed as V/t=α v, α is m3/rad。
Turbine flowmeter is adopted to have time difference, the revolving speed that will be acquired each time between the data of the revolving speed v of impeller 5 twice
After v is integrated (digital form is expressed as adding up) by the time difference, liquid total flow can be obtained:
V=α [v1×(t1-t0)+v2×(t2-t1)+…+vn×(tn-tn-1)]
The result is to be obtained by digital servo-control amplifying technique as a result, with the direct frequency phase obtained using sensor
Than the measurement errors such as frequency jitter will not be generated, due to using differential design, it is not easy to by external interference, to mention significantly
High measurement accuracy and reduce measurement error.
It is the structure and working principle to the turbine flow transducer of the present invention based on digital lock-in technique above
Explanation, the following are of the present invention, and the turbine flow detection method based on digital lock-in technique is described further, specifically
It is as follows:
As shown in fig. 7, a kind of turbine flow detection method based on digital lock-in technique, includes the following steps:
S01: high frequency sinusoidal resonant electrical signals are obtained；
The resonance circuit module 21 generates high frequency sinusoidal resonant electrical signals；
S02: the high frequency sinusoidal resonant electrical signals are converted into magnetic field signal；
The present electric signal of the high frequency sinusoidal is converted to magnetic field signal by differential sensor 1；
S03: the magnetic field signal is passed through by the impeller 5 that liquid flowing drives in tube body 4, generates low frequency magnetic field；
S04: the low frequency magnetic field passes through differential sensor, is converted to the different Low Frequency Sine Signals of at least two phases；
S05: the high frequency sinusoidal resonant electrical signals together with the Low Frequency Sine Signals into cross signal processing after, it is described just
Action frequency resonant electrical signals are filtered out, and the Low Frequency Sine Signals are converted to digital signal by filtering, amplification；
S06: the digital signal passes through frequency calculating, phase shift calculating, phase-sensitive detection and calculating, obtains the liquid for flowing through tube body
The total flow of body.
It digital signal will be calculated all the way by frequency first, and obtain the frequency of the digital signal, then believe by the number
Number carry out 1/4 period phase shift obtain phase shift signal；
Phase shift signal and another way digital signal are subjected to phase-sensitive detection, obtain the phase difference between two ways of digital signals；
Impeller is calculated by the time difference of inductive sensor in differential sensor, formula according to the frequency of two ways of digital signals
Specifically:
By the time difference, the revolving speed v of impeller is calculated, then calculates the total flow for flowing through the liquid of tube body.
The method specifically used in the present embodiment is: obtain in differential sensor 1 between two inductive sensors 11 with impeller 5
Center is the arc distance d in the center of circle, therefore can obtain the revolving speed v=d/ τ of impeller 5.This turn tested further according to experience
The fluid flow in this calculating can be obtained in the relationship (generally linear relationship, coefficient of relationship α) of fast v and fluid flow
As a result, can accurately obtain liquid total flow by calculating for a long time and fluid flow result adding up.
Specifically: where the method for determination of α are as follows: by volume V (unit: m3) liquid flow through pipe using identical speed
Body 4 can obtain the revolving speed v (unit: rad/s) of impeller 5 by flowmeter, obtain using time be t (unit: s), water
Flow velocity is V/t (unit: m3/ s), by experimental verification, for same liquid, the flow velocity of water and the revolving speed v of impeller 5 are linear
Relationship, the unit that can be expressed as V/t=α v, α is m3/rad。
Turbine flowmeter is adopted to have time difference, the revolving speed that will be acquired each time between the data of the revolving speed v of impeller 5 twice
After v is integrated (digital form is expressed as adding up) by the time difference, liquid total flow can be obtained:
V=α [v1×(t1-t0)+v2×(t2-t1)+…+vn×(tn-tn-1)]。
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, therefore
Without departing from the technical solutions of the present invention, according to the technical essence of the invention it is to the above embodiments it is any modification,
Equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of turbine flow transducer based on digital lock-in technique, for being measured to the intracorporal flow of pipe, the pipe
Impeller is installed in vivo, the turbine flow transducer includes the shell for being installed on tube wall, it is characterised in that:
The shell includes metal portion and non-metal portion；
Connection through-hole is equipped between the metal portion and the non-metal portion；
It is equipped with detection circuit board in the metal portion, is equipped with differential sensor in the non-metal portion；
The detection circuit board includes:
One resonance circuit module, for generating high frequency sinusoidal resonant electrical signals；
Two signal receiving modules, for receiving the electric signal and high frequency sinusoidal resonant electrical signals of differential sensor transmission, and
And be filtered, amplify after be converted to digital signal；
With a digital signal processing module, for receiving the digital signal, and to the digital signal carry out phase-sensitive detection,
Frequency and flow rate calculation；
The output end of the resonance circuit module is connect with the input terminal of the differential sensor；
The output end of the differential sensor is respectively connect with the input terminal of a signal receiving module；
The output end of described two signal receiving modules is connect with the input terminal of the digital signal processing module；
It is corresponding that the two-way low frequency sinusoidal letter different with frequency, phase is collected by differential sensor during the wheel rotation
Number, the two-way Low Frequency Sine Signals are sent respectively together with the high frequency sinusoidal resonant electrical signals that the resonance circuit module generates
To signal receiving module, the signal receiving module is filtered the electric signal, after enhanced processing, is converted to digital signal
It is sent to the digital signal processing module, which is carried out phase-sensitive detection, frequency by the digital signal processing module
And flow rate calculation, obtain the liquid total flow for flowing through tube body.
2. the turbine flow transducer according to claim 1 based on digital lock-in technique, it is characterised in that:
At least two inductive sensors side by side is equipped in the differential sensor.
3. the turbine flow transducer according to claim 2 based on digital lock-in technique, it is characterised in that:
The inductive sensor is arranged in the circumferential direction of the impeller.
4. the turbine flow transducer according to claim 1 based on digital lock-in technique, it is characterised in that:
The signal receiving module includes filter circuit, operational amplification circuit and analog to digital conversion circuit；
The output end of the filter circuit is connect with the input terminal of the operational amplification circuit；
The output end of the operational amplification circuit and the input terminal of analog-digital conversion circuit as described connect.
5. the turbine flow transducer according to claim 1 based on digital lock-in technique, it is characterised in that:
The digital signal processing module includes two sinusoidal signal input terminals, frequency computing unit, phase-shifting unit, phase-sensitive detection
Unit and flow rate calculation unit；
One of sinusoidal signal input terminal is connect with an input terminal of phase-sensitive detection unit, and another one sinusoidal signal is defeated
Enter end to connect with the input terminal of the frequency computing unit；
The output end of the frequency computing unit is connect with the input terminal of the phase-shifting unit；
The output end of the phase-shifting unit is connect with another input terminal of the phase-sensitive detection unit；
The output end of the phase-sensitive detection unit is connect with the flow rate calculation unit.
6. the turbine flow transducer according to claim 1 based on digital lock-in technique, it is characterised in that:
The metal portion uses stainless steel material；
The non-metal portion uses high temperature resistant, corrosion resistant material.
7. the turbine flow transducer according to claim 1 based on digital lock-in technique, it is characterised in that:
The impeller is metal nonmagnetic body.
8. a kind of turbine flow detection method based on digital lock-in technique, which comprises the steps of:
Obtain high frequency sinusoidal resonant electrical signals；
The high frequency sinusoidal resonant electrical signals are converted into magnetic field signal；
The magnetic field signal is passed through by the impeller that liquid flowing drives in tube body, generates low frequency magnetic field；
The low frequency magnetic field passes through differential sensor, is converted to the different Low Frequency Sine Signals of at least two phases；
For the high frequency sinusoidal resonant electrical signals together with the Low Frequency Sine Signals after signal processing, the high frequency sinusoidal is humorous
Vibration electric signal is filtered out, and the Low Frequency Sine Signals are converted to digital signal by filtering, amplification；
The digital signal passes through frequency calculating, phase shift calculating, phase-sensitive detection and calculating, obtains the total stream for the liquid for flowing through tube body
Amount.
9. the turbine flow detection method according to claim 8 based on digital lock-in technique, it is characterised in that:
The digital signal passes through frequency calculating, phase shift calculating, phase-sensitive detection and calculating, obtains the total stream for the liquid for flowing through tube body
The step of amount, is specifically:
First will all the way digital signal by frequency calculate, obtain the frequency of the digital signal, then again by the digital signal into
The phase shift in 1/4 period of row obtains phase shift signal；
Phase shift signal and another way digital signal are subjected to phase-sensitive detection, obtain the phase difference between two ways of digital signals；
Impeller is calculated by the time difference of inductive sensor in differential sensor according to the frequency of two ways of digital signals, and formula is specific
Are as follows:θ is phase difference；ω is the frequency of signal；
By the time difference, the revolving speed v of impeller is calculated, then calculates the total flow for flowing through the liquid of tube body.
10. the turbine flow detection method according to claim 9 based on digital lock-in technique, it is characterised in that:
By the time difference, the revolving speed v of impeller is calculated, then calculating total flow, specific step is as follows:
The revolving speed v=d/ τ of impeller is calculated, wherein d is between two inductive sensors using impeller center as the arc distance in the center of circle；
Calculating adopts to have time difference t between the data of the revolving speed v of impeller twice；
The flow velocity for flowing through the liquid of tube body is V/t；
Using same liquid, the flow velocity V/t of liquid and the flow velocity v of impeller are in a linear relationship, specially V/t=α v, and wherein α is line
The coefficient of sexual intercourse；
The total flow of liquid is the integral that revolving speed v passes through the time difference each time, specific formula is as follows:
V=α [v1×(t1-t0)+v2×(t2-t1)+…+vn×(tn-tn-1)]。
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| CN102007380A (en) * | 2009-02-06 | 2011-04-06 | 株式会社奥巴尔 | Signal processing method, signal processing apparatus, and coriolis flowmeter |
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| CN102639972A (en) * | 2010-02-19 | 2012-08-15 | 株式会社奥巴尔 | Signal processing method, signal processing device, and coriolis flow meter |
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