CN109341732A - A kind of vibrating string type sensor parameter measurement circuit and method - Google Patents
A kind of vibrating string type sensor parameter measurement circuit and method Download PDFInfo
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- CN109341732A CN109341732A CN201811402938.0A CN201811402938A CN109341732A CN 109341732 A CN109341732 A CN 109341732A CN 201811402938 A CN201811402938 A CN 201811402938A CN 109341732 A CN109341732 A CN 109341732A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
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Abstract
The present invention provides a kind of vibrating string type sensor parameter measurement circuit and method, the parameter measurement circuit includes resistance measuring circuit, the resistance measuring circuit includes operational amplifier, the single coil excitement of vibrating string type sensor is connected between the output end and non-inverting input terminal of the operational amplifier, first resistor is connected between the non-inverting input terminal and ground GND of the operational amplifier, the inverting input terminal of the operational amplifier is connected with the first reference voltage signal, and the output end of the operational amplifier also passes through analog-digital converter and is connected with microprocessor.The present invention can be improved measurement accuracy.
Description
Technical field
The present invention relates to Signal Collection Technology field, in particular to a kind of vibrating string type sensor parameter measurement circuit and side
Method.
Background technique
With the development of technology, the enlargement of building, complication trend are more and more obvious, in order to ensure infrastructure construction
It while fast-developing, can also guarantee safe production, need to continuously improve and improve the safety monitoring technology in engineering field.Mesh
Mainly it is related to the phase of system safety in preceding engineering to pressure, stress, osmotic pressure, sedimentation, pulling force etc. using vibrating string type sensor
Data are closed to be monitored.In techniques well known, the parameter that vibrating string type sensor signal mainly acquires be resistance signal with
Frequency signal executes a certain algorithm by resistance and frequency signal and the relationships such as pressure, stress, osmotic pressure, sedimentation, pulling force is calculated
To the related data of system safety.
Since frequency signal has good noiseproof feature in transmission process, the characteristics of being easy to long distance transmission, vibratory string
Formula sensor is in engineering field using extremely wide.Simultaneously as monitoring object is relatively fixed, and monitoring cycle is longer, currently,
Monitoring personnel mostly uses collecting cassette to be acquired manually, since measuring point quantity is more and arrangement dispersion, in collection process manpower at
This is difficult to control, and in work progress, field condition is complex, and there is a certain security risk for artificial acquisition.With information
The development of technology and the urgent demand in market, mainstream vendor, which has begun, to develop corresponding type vibration wire automation collection and sets
Standby, since construction site power supply is difficult, and route is easy to be destroyed, and not only results in the loss of monitoring data, or even can draw
Send out the ill effects such as personal injury or fire.Existing automation collection equipment is commonly provided with ups power, but its cruising ability is still
It is not able to satisfy long term monitoring demand.Therefore, the Optimization Work for needing to carry out power consumption from many aspects is adopted in vibratory string equipment.
The intrinsic frequency of vibrating string type sensor oscillation is there are an approximate range, usually 400-4500HZ.According to physics
Resonance principle in, when the frequency for the pumping signal being applied on sensor is close or equal with sensor string wire intrinsic frequency
When, string wire resonates.Under resonance state, the amplitude of string wire oscillation is larger.There are two types of vibrating string type sensor exciting modes, a kind of
It is that high pressure is manipulated the strings exciting, one is low pressure scanning frequency excitations.
The exciting mode that high pressure is manipulated the strings usually selects triode to amplify pulse signal, by transformer by triode
The AC signal affinity of output is into voltage doubling rectifing circuit.By controlling the charging time to capacitor in voltage-multiplying circuit, to adjust
The final charging voltage at capacitor both ends.When capacitor both end voltage reaches 110V or so, the voltage at capacitor both ends is added to vibratory string line
On circle.Electric current on coil generates the vibration of magnetic drive string wire, when driving current disappears, due to depositing for inertia and air drag
Vibratory string has done damping vibration attenuation free oscillation, and vibration frequency is the intrinsic frequency of string wire at this time.The excitation chain that high pressure is manipulated the strings
It being made of transformer and voltage doubling rectifing circuit etc., circuit structure is complex, and it is bulky, it is unfavorable for sensor testing apparatus
Miniaturization.High pressure manipulate the strings be applied to coil both ends voltage it is larger, the magnetic force for accordingly stirring string wire is larger, easily causes sensor steel
The aging of string and route.The amplitude of sensor output signal is smaller, and signal duration is relatively short, therefore in this way
The low measurement accuracy of sensor.
Low pressure scanning frequency excitation uses the low pressure driving pulse comprising sensor oscillation frequency range, is added to cell winding
On.The pulse signal frequency of sensor is applied in driving frequency section according to certain step change, in order to guarantee that string wire can
Starting of oscillation, pulse signal need to keep a period of time in each small frequency band.Relatively high pressure is manipulated the strings exciting mode, string wire vibration
Amplitude is big, and the induced electromotive force incuded in coil is larger, and sensor output signal duration length, amplitude are big.Low pressure frequency sweep
Exciting mode, it is high to the detection accuracy of sensor, but required time is longer.It, usually can be with people generally for the frequency sweep time is reduced
For swept frequency section is divided into several segments, or in the way of feedback exciting, the efficiency of exciting is improved, reduces time of measuring.
It is measured referring to FIG. 4, the measurement of resistance signal Rx generallys use resistance bridge circuit, wherein resistance R6, R7, R8
Resistance value it is equal.The value of the resistance △ Rx of sensor is obtained by following equation 1.Wherein Rx is the electricity to be measured of vibrating string type sensor
The initial value of resistance, U are the voltage value between the common intersection of resistance Rx and R8 and the common intersection of resistance R6 and R7, and △ U is electricity
Hinder the voltage variety between the common intersection of R8 and R9 and the common intersection of resistance Rx and R6.
Since the measurement method of resistance bridge circuit is to carry out inverse by voltage, and such measurement method voltage is deposited with resistance
In non-linear relation, linear approximation is only selected in general, in a certain range relatively, and is more than the range
Then can error it is larger.In monitoring process, there are much noises for frequency data, are filtered using conventional method, and data exist
Shake, influences data precision.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the above deficiency, provide a kind of vibrating string type sensor parameter survey
Circuit and method are measured, to improve measurement accuracy.
In order to solve the above technical problem, the present invention provides a kind of vibrating string type sensor parameter measurement circuit, the parameters
Including resistance, the parameter measurement circuit includes resistance measuring circuit, and the resistance measuring circuit includes operational amplifier, described
The single coil excitement of vibrating string type sensor, the operational amplifier are connected between the output end and non-inverting input terminal of operational amplifier
Non-inverting input terminal and ground GND between be connected with first resistor, the inverting input terminal of the operational amplifier is connected with the first ginseng
Voltage signal is examined, the output end of the operational amplifier also passes through analog-digital converter and is connected with microprocessor.
Further, vibrating string type sensor parameter measurement circuit provided by the invention, the first resistor are precision resistance,
The error range of the precision resistance is between 0.1%-0.01%.
Further, vibrating string type sensor parameter measurement circuit provided by the invention, the parameter include frequency, the ginseng
Number measuring circuit further includes frequency measurement circuit, and the frequency measurement circuit includes the second reference voltage signal, low noise operational
Amplifier and comparator are connected with vibration between second reference voltage signal and the non-inverting input terminal of low noise operational amplifier
The single coil excitement of string type sensor, the inverting input terminal of the low noise operational amplifier are connected with third reference voltage signal,
Bandpass filter is connected between the output end of the low noise operational amplifier and the non-inverting input terminal of the comparator, it is described
The inverting input terminal of comparator is connected with the 4th reference voltage signal R2, and the output end of the comparator is vibrating string type sensor
The digital signal level of single coil excitement is believed according to the frequency that the data level signal calculates the single coil excitement of vibrating string type sensor
Number.
Further, vibrating string type sensor parameter measurement circuit provided by the invention, second reference voltage signal with
The first variable resistance and 3rd resistor of concatenation are connected between the output end of the low noise operational amplifier, described first can
The convertible tip of power transformation resistance is connected to the inverting input terminal of the low noise operational amplifier.
Further, vibrating string type sensor parameter measurement circuit provided by the invention, second reference voltage signal with
The second adjustable resistance and the 4th resistance of concatenation are connected between ground GND, the convertible tip of the second adjustable resistance is connected to institute
State the inverting input terminal of comparator.
Further, vibrating string type sensor parameter measurement circuit provided by the invention, the variable resistance are program-controlled resistor.
In order to solve the above-mentioned technical problem, the present invention also provides a kind of vibrating string type sensor measurement method of parameters, the ginsengs
Number measurement method includes resistance measurement method, using the resistance measuring circuit in above-mentioned parameter measurement circuit, according to shock line
The feedback voltage signal feedback of the common intersection of circle and first resistor will feed back electricity to the non-inverting input terminal of the operational amplifier
Output end output analog voltage signal through the operational amplifier after pressure signal is compared with the first reference voltage signal, when
When feedback voltage signal is equal to the first reference voltage signal, analog voltage signal is converted to digital voltage by analog-digital converter to be believed
Number, the resistance that following algorithm calculates single coil excitement is executed by microprocessor；
Wherein Rx is the resistance of single coil excitement, and Vout is the output end voltage of operational amplifier, and Vr1 is the first reference voltage
Signal, R1 are first resistor.
Further, vibrating string type sensor measurement method of parameters provided by the invention, the measurement method of parameters further include
Frequency measurement method will be swashed using the frequency measurement circuit in above-mentioned parameter measurement circuit by the second reference voltage signal
The useful signal of vibration coil and the amplitude of noise signal are loaded on the second reference voltage signal, make useful signal and noise signal
The non-inverting input terminal for inputing to the low noise operational amplifier, with the inverting input terminal of the low noise operational amplifier
Three reference voltage signals relatively after, filtered out after the high-frequency noise in noise signal by low noise operational amplifier through the low noise
Low-frequency noise signal in the output end output useful signal and noise signal of sound operational amplifier, by the bandpass filter
The non-inverting input terminal that useful signal is inputed to after low-frequency noise signal the comparator is filtered out, the comparator will be inputed to
After the useful signal of non-inverting input terminal is compared with the 4th reference voltage signal R2 of comparator inverting input terminal, by comparing
The analog level signal of useful signal is converted to digital signal level by the output end of device, according to there is data level signal to be shaken
The frequency signal of the single coil excitement of string type sensor.
Further, vibrating string type sensor measurement method of parameters provided by the invention, by the low noise operational amplifier
Non-inverting input terminal and inverting input terminal exchanged, and/or by the non-inverting input terminal of the comparator and inverting input terminal into
Row exchange.
Further, vibrating string type sensor measurement method of parameters provided by the invention, the comparator use operation amplifier
Device replacement.
Vibrating string type sensor parameter measurement circuit and method provided by the invention, can measure the exciting of vibrating string type sensor
The resistance value of coil.The present invention measures the analog voltage signal of single coil excitement by operational amplifier, will swash through analog-digital converter
After the analog voltage signal of vibration coil is converted to digital voltage signal, a certain algorithm is executed to realize to be measured by microprocessor
The purpose of the resistance value precise measurement of the single coil excitement of the vibrating string type sensor of amount, to improve the resistance of single coil excitement to be measured
Measurement accuracy.The present invention passes through replacement or the resistance value of adjusting first resistor, the measurement of adjustable single coil excitement to be measured
Range, to further increase measurement accuracy.The present invention is low pressure due to operational amplifier, analog-digital converter and microprocessor
Device, thus resistance measuring circuit of the invention compared to resistance bridge circuit for, have low-voltage supply, the effect of low-power consumption
Fruit.Vibrating string type sensor parameter measurement circuit and method provided by the invention, additionally it is possible to measure the shock line of vibrating string type sensor
The frequency values of circle.The amplitude of the useful signal of single coil excitement and noise signal is loaded into the purpose on the second reference voltage signal
It is the nonlinear amplification region in order to bypass low noise operational amplifier, to prevent the signal by low noise operational amplifier to lack
Mistake causes measurement error, to improve the measurement accuracy to single coil excitement for the first time.After low noise operational amplifier, filter out
HF noise signal in noise signal, to improve the measurement accuracy to single coil excitement for the second time.Pass through bandpass filtering
Device filters out low-frequency noise signal and HF noise signal that may be present in noise signal, so that third time is improved to exciting
The measurement accuracy of coil.That is, the present invention has repeatedly been carried out to noise signal in the frequency measuring process of single coil excitement
Processing, to improve the measurement accuracy of frequency.The present invention can pass through the electricity of the single coil excitement of measurement vibrating string type sensor
Pressure in engineering field etc. using vibrating string type sensor to be measured, stress, osmotic pressure, heavy is calculated in resistance value and frequency values
Drop, pulling force etc. are related to the related data of system safety, so that treating measured zone carries out safety monitoring.
Detailed description of the invention
Fig. 1 is the schematic diagram of the resistance measuring circuit of vibrating string type sensor；
Fig. 2 is the schematic diagram of the frequency measurement circuit of vibrating string type sensor；
Fig. 3 is the schematic diagram of the voltage reference circuit of the second reference voltage signal；
Fig. 4 is the schematic diagram of resistance bridge measurement resistance circuit.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing:
The present invention provides a kind of vibrating string type sensor parameter measurement circuit and method, and wherein parameter includes resistance and frequency,
Parameter measurement circuit includes resistance measuring circuit and frequency measurement circuit, and measurement method of parameters includes resistance measurement method and frequency
Measurement method.
Embodiment one
Referring to FIG. 1, the present embodiment one provides a kind of resistance measuring circuit of vibrating string type sensor, including operational amplifier
110, the single coil excitement L of vibrating string type sensor is connected between the output end and non-inverting input terminal of the operational amplifier 110,
The resistance R of middle single coil excitement LLIt indicates, is connected with first between the non-inverting input terminal and ground GND of the operational amplifier 110
Resistance R1, the inverting input terminal of the operational amplifier 110 are connected with the first reference voltage signal Vr1, the operational amplifier
110 output end also passes through analog-digital converter 120 and is connected with microprocessor 130.The microprocessor 130 can be single-chip microcontroller
(MCU), digital signal processor (DSP), Complex Programmable Logic Devices (CPLD) or field programmable gate array (FPGA).Its
Middle first resistor R1 can be precision resistance, and the error range of the precision resistance is between 0.1%-0.01%.First resistor
R1 may be variable resistance.By replacing or adjusting the resistance value of first resistor R1, adjustable single coil excitement L to be measured
Measurement range, to further increase measurement accuracy.
The present embodiment one also provides a kind of vibrating string type sensor of resistance measuring circuit based on above-mentioned vibrating string type sensor
Resistance measurement method, according to the feedback voltage signal Vf of the common intersection of single coil excitement L and first resistor R1 feedback to described
The non-inverting input terminal of operational amplifier 110, through institute after feedback voltage signal Vf is compared with the first reference voltage signal Vr1
The output end output analog voltage signal Vout for stating operational amplifier 110, when feedback voltage signal Vf is equal to the first reference voltage
When signal Vr1, analog voltage signal is converted to digital voltage signal by analog-digital converter 120, by microprocessor 130 execute with
Lower algorithm calculates the resistance R of single coil excitement LL；
Wherein RLFor the resistance of single coil excitement L, Vout is the output end voltage of operational amplifier 110, and Vr1 is the first reference
Voltage signal Vr1, R1 are first resistor R1.
Referring to FIG. 1, analog-digital converter 120 can be individual devices, or the integrator inside microprocessor 130
Part.
As a kind of deformation, non-inverting input terminal and the inverting input terminal of the operational amplifier 110 can be exchanged, in Fig. 1
Specific embodiment must not be as the limitation of the present embodiment one.
The resistance measuring circuit and method for the vibrating string type sensor that the present embodiment one provides, can measure vibrating string type sensor
Single coil excitement L resistance value.The present embodiment one measures the analog voltage signal of single coil excitement L by operational amplifier 110
Vout passes through micro process after the analog voltage signal of single coil excitement L is converted to digital voltage signal by analog-digital converter 120
Device 130 executes above-mentioned algorithm to realize the mesh of the resistance value precise measurement to the single coil excitement L of vibrating string type sensor to be measured
, to improve the resistance measurement precision of single coil excitement L to be measured.
The present embodiment one since operational amplifier 110, analog-digital converter 120 and microprocessor 130 are low-voltage device, because
The resistance measuring circuit of this present embodiment one compared to resistance bridge circuit for, have low-voltage supply, the effect of low-power consumption.I.e.
The microprocessor 130 of the present embodiment one can obtain higher resistance exact value under very low power consumption and voltage, to improve
Measurement accuracy.The present embodiment one can be balanced in power consumption and measurement accuracy.Energy consumption when avoiding resistance bridge circuit measurement
Larger, voltage is high, and error is not fixed in surveying range, is unable to fully adapt to the defect of type vibration wire low-power consumption acquisition equipment.
Embodiment two
Referring to FIG. 2, the present embodiment two provides a kind of frequency measurement circuit of vibrating string type sensor, including the second reference electricity
Press signal Vr2, low noise operational amplifier 210 and comparator 230, the second reference voltage signal Vr2 and low noise operational
The single coil excitement L of vibrating string type sensor, the low noise operational amplifier are connected between the non-inverting input terminal of amplifier 210
210 inverting input terminal is connected with third reference voltage signal Vr3, the output end of the low noise operational amplifier 210 and institute
It states and is connected with bandpass filter 220 between the non-inverting input terminal of comparator 230, the inverting input terminal connection of the comparator 230
There are the 4th reference voltage signal Vr4, the number electricity that the output end of the comparator 230 is the single coil excitement L of vibrating string type sensor
Ordinary mail number calculates the frequency signal of the single coil excitement L of vibrating string type sensor according to the data level signal.
The low noise operational amplifier 210, bandpass filter 220 and comparator 230 of the present embodiment two are low-voltage device,
Therefore the frequency measurement circuit of the present embodiment two mutually equally has the effect of low-power consumption.
Referring to FIG. 2, the frequency measurement circuit for the vibrating string type sensor that the present embodiment two provides, second reference voltage
The the first variable resistance R2 concatenated and third are connected between signal Vr2 and the output end of the low noise operational amplifier 210
The convertible tip of resistance R3, the first variable resistance R2 are connected to the inverting input terminal of the low noise operational amplifier 210.Its
In the first variable resistance R2 can be program-controlled resistor.First variable resistance R2 and 3rd resistor R3 is convenient for adjusting low-noise amplifier
The third reference voltage signal Vr3 of 210 inverting input terminal.Especially when the first variable resistance R2 is program-controlled resistor, adjust
The digital quantity of section can be improved the frequency accuracy of single coil excitement L to be measured.
Referring to FIG. 2, the frequency measurement circuit for the vibrating string type sensor that the present embodiment two provides, second reference voltage
The second adjustable resistance R5 and the 4th resistance R4 concatenated is connected between signal Vr2 and ground GND, the second adjustable resistance R5's
Convertible tip is connected to the inverting input terminal of the comparator 230.Wherein the second adjustable resistance R5 can be program-controlled resistor.Second can
It is identical as the first variable resistance R2 that power transformation hinders the effect of R5.The circuit conduct that the second adjustable resistance R5 and the 4th resistance R4 is constituted
The biasing circuit of comparator 230, in the 4th reference voltage signal that the inverting input terminal of comparator 230 uses divider resistance to obtain
Vr4 eliminates the influence of the input offset voltage of comparator 230, plays the purpose in accurate output burst length.
The present embodiment two also provides a kind of frequency of the vibrating string type sensor of frequency measurement circuit based on vibrating string type sensor
The amplitude of the useful signal of single coil excitement L and noise signal is loaded by rate measurement method by the second reference voltage signal Vr2
On second reference voltage signal Vr2, useful signal and noise signal is made to input to the same phase of the low noise operational amplifier 210
Input terminal, compared with the third reference voltage signal Vr3 of the inverting input terminal of the low noise operational amplifier 210 after, pass through
Low noise operational amplifier 210 filters out the output through the low noise operational amplifier 210 after the high-frequency noise in noise signal
Low-frequency noise signal in end output useful signal and noise signal filters out low-frequency noise letter by the bandpass filter 220
The non-inverting input terminal that useful signal is inputed to the comparator 230 after number will input to the homophase input of the comparator 230
After the useful signal at end is compared with the 4th reference voltage signal Vr4 of 230 inverting input terminal of comparator, pass through comparator
The analog level signal of useful signal is converted to digital signal level V by 230 output endL, according to there is data level signal VL?
To the frequency signal of the single coil excitement L of vibrating string type sensor.
As vibrating string type sensor parameter measurement circuit and method that a kind of deformation, the present embodiment two provide, the low noise
The non-inverting input terminal and inverting input terminal of sound operational amplifier 210 can be exchanged.The non-inverting input terminal of the comparator 230
It can also be exchanged with inverting input terminal.
The vibrating string type sensor parameter measurement circuit and method that the present embodiment two provides, the comparator 230 use operation
Amplifier 110 is replaced.Comparator 230 is preferably high-speed comparator, and voltage rising time is short, it can be ensured that subsequent number electricity
Ordinary mail number is available to arrive the more accurate burst length, to improve measurement efficiency.High-speed comparator can get accurate pulse
Waveform, to obtain accurate frequency data.
The frequency range of bandpass filter 220 can be according to the single coil excitement L's of vibrating string type sensor in the present embodiment two
Working frequency is preset.The vibration frequency of the single coil excitement L of vibrating string type sensor is generally between 400Hz-4000Hz.
Reference voltage signal in the present embodiment one or two can divide the voltage reference circuit constituted by series resistor
It provides.Referring to FIG. 3, for example: the second reference voltage signal Vr2 is mentioned by the voltage reference circuit 240 that series resistor partial pressure is constituted
For.
The frequency measurement circuit and method for the vibrating string type sensor that the present embodiment two provides, can measure vibrating string type sensor
Single coil excitement L frequency values.The amplitude of the useful signal of single coil excitement L and noise signal is loaded into the second reference voltage letter
Purpose on number Vr2 is the nonlinear amplification region in order to bypass low noise operational amplifier 210, to prevent from transporting by low noise
The signal deletion for calculating amplifier 210 causes measurement error, to improve the measurement accuracy to single coil excitement L for the first time.By low
After noise operational amplifier 210, the HF noise signal in noise signal is filtered out, to improved for the second time to single coil excitement
The measurement accuracy of L.The low-frequency noise signal and high-frequency noise that may be present in noise signal are filtered out by bandpass filter 220
Signal, so that third time improves the measurement accuracy to single coil excitement L.That is, frequency of the present embodiment two to single coil excitement L
The processing to noise signal is repeatedly carried out in rate measurement process, to improve the measurement accuracy of frequency.
The present invention can be calculated to be measured by the resistance value and frequency values for measuring the single coil excitement L of vibrating string type sensor
Pressure, stress, osmotic pressure, sedimentation, pulling force in engineering field of the vibrating string type sensor of amount etc. etc. are related to the phase of system safety
Data are closed, so that treating measured zone carries out safety monitoring.
The present invention starts with from measurement accuracy is improved with the basis of low-power consumption, optimization design resistance measuring circuit and frequency
Measuring circuit.
The above embodiment of the present invention has implementation succinctly, and precision is high, feature low in energy consumption, at low cost.Mainly from simulation
Signal Collection Technology, the aspect of analog signal processing technology two are realized, it is only necessary to using common electronic component in the market,
It can realize low-power consumption, the purpose of high-acruracy survey, while ensure that the period that the stability in product later period and product use.
Wherein, compared with traditional tension measuring circuit, there is the present invention resistance measuring circuit error to keep permanent in entire surveying range
Fixed advantage, can by adjust precision resister resistance value realize measurement range and measurement accuracy adjusting, with reach power consumption and
The balance of precision only need to configure general dry battery and can reach measurement accuracy and want in the vibratory strings such as vibrating wire sensor acquisition equipment
It asks and realizes low-power consumption purpose.Wherein, for frequency measurement circuit compared with conventional frequency measurement circuits, the present invention can simplify circuit,
Circuit stability is improved, frequency measurement accuracy is improved, power consumption is lower, common batteries power supply can be used, without carrying out large amount of complex
Calculating, frequency measurement speed is fast, it can be achieved that prolonged detection in real time.
The present embodiment is not limited to the above specific embodiments one or two, all made within the spirit and scope of the present invention each
Kind variation, within the protection scope of the present embodiment one.
Claims (10)
1. a kind of vibrating string type sensor parameter measurement circuit, which is characterized in that the parameter includes resistance, the parameter measurement electricity
Road includes resistance measuring circuit, and the resistance measuring circuit includes operational amplifier, the output end of the operational amplifier and same
Be connected with the single coil excitement of vibrating string type sensor between phase input terminal, the non-inverting input terminal and ground GND of the operational amplifier it
Between be connected with first resistor, the inverting input terminal of the operational amplifier is connected with the first reference voltage signal, and the operation is put
The output end of big device also passes through analog-digital converter and is connected with microprocessor.
2. vibrating string type sensor parameter measurement circuit as described in claim 1, which is characterized in that the first resistor is precision
Resistance, the error range of the precision resistance is between 0.1%-0.01%.
3. vibrating string type sensor parameter measurement circuit as described in claim 1, which is characterized in that the parameter includes frequency,
The parameter measurement circuit further includes frequency measurement circuit, and the frequency measurement circuit includes the second reference voltage signal, low noise
Sound operational amplifier and comparator connect between second reference voltage signal and the non-inverting input terminal of low noise operational amplifier
It is connected to the single coil excitement of vibrating string type sensor, the inverting input terminal of the low noise operational amplifier is connected with third reference voltage
Signal is connected with bandpass filtering between the output end of the low noise operational amplifier and the non-inverting input terminal of the comparator
Device, the inverting input terminal of the comparator are connected with the 4th reference voltage signal R2, and the output end of the comparator is type vibration wire
The digital signal level of the single coil excitement of sensor calculates the single coil excitement of vibrating string type sensor according to the data level signal
Frequency signal.
4. vibrating string type sensor parameter measurement circuit as claimed in claim 3, which is characterized in that the second reference voltage letter
Number it is connected with the first variable resistance concatenated and 3rd resistor between the output end of the low noise operational amplifier, described
The convertible tip of one variable resistance is connected to the inverting input terminal of the low noise operational amplifier.
5. vibrating string type sensor parameter measurement circuit as claimed in claim 3, which is characterized in that the second reference voltage letter
Number the second adjustable resistance concatenated and the 4th resistance are connected between ground GND, the convertible tip connection of the second adjustable resistance
In the inverting input terminal of the comparator.
6. vibrating string type sensor parameter measurement circuit as described in claim 4 or 5, which is characterized in that the variable resistance is
Program-controlled resistor.
7. a kind of vibrating string type sensor measurement method of parameters, which is characterized in that the measurement method of parameters includes resistance measurement side
Method, using the resistance measuring circuit in parameter measurement circuit such as of any of claims 1-2, according to single coil excitement and
The feedback voltage signal feedback of the common intersection of first resistor believes feedback voltage to the non-inverting input terminal of the operational amplifier
Output end output analog voltage signal after number being compared with the first reference voltage signal through the operational amplifier, works as feedback
When voltage signal is equal to the first reference voltage signal, analog voltage signal is converted to digital voltage signal by analog-digital converter, is led to
It crosses microprocessor and executes the resistance that following algorithm calculates single coil excitement；
Wherein Rx is the resistance of single coil excitement, and Vout is the output end voltage of operational amplifier, and Vr1 is the first reference voltage letter
Number, R1 is first resistor.
8. vibrating string type sensor measurement method of parameters as claimed in claim 7, which is characterized in that the measurement method of parameters is also
Including frequency measurement method, using the frequency measurement circuit in the parameter measurement circuit as described in any one of claim 3-5,
The amplitude of the useful signal of single coil excitement and noise signal is loaded into the second reference voltage letter by the second reference voltage signal
On number, useful signal and noise signal is made to input to the non-inverting input terminal of the low noise operational amplifier, with the low noise
The third reference voltage signal of the inverting input terminal of operational amplifier relatively after, by low noise operational amplifier filter out noise letter
Output end output useful signal after high-frequency noise in number through the low noise operational amplifier and the low frequency in noise signal
Useful signal is inputed to the same phase of the comparator by noise signal after the bandpass filter filters out low-frequency noise signal
Input terminal will input to the useful signal of the non-inverting input terminal of the comparator and the 4th reference electricity of comparator inverting input terminal
After pressure signal R2 is compared, the analog level signal of useful signal is converted to by digital level letter by the output end of comparator
Number, according to have data level signal obtain vibrating string type sensor single coil excitement frequency signal.
9. vibrating string type sensor measurement method of parameters as claimed in claim 8, which is characterized in that put the low noise operational
The non-inverting input terminal and inverting input terminal of big device are exchanged, and/or by the non-inverting input terminal and anti-phase input of the comparator
End is exchanged.
10. vibrating string type sensor measurement method of parameters as claimed in claim 8, which is characterized in that the comparator is using fortune
Calculate amplifier replacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811402938.0A CN109341732A (en) | 2018-11-23 | 2018-11-23 | A kind of vibrating string type sensor parameter measurement circuit and method |
Applications Claiming Priority (1)
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| CN114440936A (en) * | 2021-12-28 | 2022-05-06 | 福建省永正工程质量检测有限公司 | Signal acquisition circuit of vibrating wire type sensor |
| CN114526810A (en) * | 2021-12-28 | 2022-05-24 | 福建省永正工程质量检测有限公司 | Frequency measurement method of vibrating wire type sensor |
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