CN107884118A - A kind of frequency calibrating method of vibrating wire acquirer - Google Patents
A kind of frequency calibrating method of vibrating wire acquirer Download PDFInfo
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- CN107884118A CN107884118A CN201710907784.XA CN201710907784A CN107884118A CN 107884118 A CN107884118 A CN 107884118A CN 201710907784 A CN201710907784 A CN 201710907784A CN 107884118 A CN107884118 A CN 107884118A
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- frequency
- correction coefficient
- collection
- value
- vibrating wire
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention relates to a kind of frequency calibrating method of vibrating wire acquirer, belongs to civil structure safety monitoring industry field, can improve the frequency collection precision and uniformity of vibrating wire acquirer.Demarcated using standard signal source, obtain corresponding correction coefficient, and be stored in EEPROM.In normal acquisition, frequency calibration is carried out according to correction coefficient, obtains finally gathering output valve, to improve the precision of frequency collection.Vibrating wire sensor is because the advantages that its is simple in construction, stability is high is commonly used and civil structure detection industry, one of and the frequency values of sensor output are directly related to sensor accuracy class, therefore an important factor for the frequency measurement accuracy of vibrating wire acquirer is the measuring precision.
Description
Technical field
The present invention relates to a kind of frequency calibrating method of vibrating wire acquirer, belongs to civil structure safety monitoring industry field,
The frequency collection precision and uniformity of vibrating wire acquirer can be improved.
Background technology
Vibratory string class sensor causes measurement stability, cost advantage to be widely used in civil structure safety monitoring field, often
With short-term detection engineering, long-term monitoring works project.Need to connect harvester completion frequency collection work during use, lead to
Overfrequency value carries out the calculating of force value, stress.
The method that currently used vibrating wire acquirer frequency calculates mainly has counting method and FFT（Fast Fourier Transform (FFT)）
Method, wherein counting method general principle are that the pulse in the unit interval is counted, and obtain frequency values, and this method is realized simply,
But measurement error is generally ± more than 1Hz, it is difficult to meets requirement of the Vehicles Collected from Market to measurement accuracy.
And recently as the development of microprocessor and analog-digital converter, the optimization of its data-handling capacity, cost, make
It must realize that the product that frequency calculates is more and more by the way of FFT.Its general principle is the sample frequency using 8kHz
Signal is sampled, general 1024 data points of collection carry out FFT calculating, obtain the spectrum information of vibratory string signal, so as to
To the frequency values of vibratory string signal.And use in the system that FFT carries out frequency collection calculating, influenceing its acquisition precision mainly has system
The factors such as the circuit delay of error, the error of analog-digital converter and different interchannels that oikocryst shakes.And these influence factors are present
Certain deficiency be present in certain discreteness and uncertainty, the measurement error and equipment room uniformity for causing acquisition system.
In summary, traditional vibratory string acquisition system is caused due to the influence of the factors such as itself measuring principle, the difference of device
Certain error be present when calculating frequency, have some limitations.
The content of the invention
Present invention aims at a kind of frequency calibrating method of vibrating wire acquirer is provided, technical problem to be solved just exists
In：（1）The acquisition correction of vibrating wire acquirer can be achieved to improve measurement accuracy.（2）It is between different vibrating wire acquirers and different
The function of equipment uniformity between passage.
In the system of frequency collection calculating is carried out using FFT, the mistake that its acquisition precision mainly has system oikocryst to shake is influenceed
The combined factors such as the circuit delay of difference, the error of analog-digital converter and different interchannels influence.Although such influence factor is present
Discreteness, but on same Acquisition Instrument, error caused by its influence factor is relatively-stationary, can be entered by way of correction
Row amendment.The purpose of correction is mainly to improve the acquisition precision deficiency of the uncorrected Acquisition Instrument of tradition, and vibrating wire acquirer
Consistency problem.
The present invention to achieve these goals, using following technical scheme：
A kind of frequency calibrating method of vibrating wire acquirer, this method are as follows：
Demarcated using standard signal source, obtain corresponding correction coefficient, and be stored in EEPROM；
In normal acquisition, frequency calibration is carried out according to correction coefficient, obtains finally gathering output valve, to improve frequency collection
Precision；
The indicating value of the corresponding output collection of Acquisition Instrument now to be corrected, the indicating value is uncorrected, then by standard signal frequency
The indicating value of value output collection corresponding with Acquisition Instrument to be corrected, the indicating value is uncorrected, carries out linear fit, it is public to obtain fitting
Formula：The uncorrected collection indicating values of standard value=correction factor *, to obtain correction factor；
After correction coefficient is obtained, correction coefficient is written in EEPROM or other memories, as follow-up calling, that is, pressed
Correction coefficient is stored respectively according to channel number；When under normal acquisition pattern, after Acquisition Instrument collects original frequency value, further according to corresponding
Channel number, correction coefficient corresponding to lookup, according to correction factor be multiplied by it is uncorrected collection indicating value calculation, obtain school
Frequency values after just.
Further, it is ± 0.01Hz standard signal source outputting standard signals that this method, which needs to use output accuracy, according to
500Hz, 1kHz, 1.5kHz, 2kHz, 2.5kHz, 3kHz, 3.5 kHz, 4 kHz are exported.
Further, this method needs to use Acquisition Instrument to be corrected to be acquired standard signal, is not carried out school
Positive collection indicating value, and be fitted with standard value, fitting coefficient is obtained, its fundamental relation is：Standard value=correction factor * is not
The collection indicating value of correction, so as to obtain correction coefficient.
Further, the acquisition precision and uniformity of acquisition system are improved, when in use, uses same or same precision
The signal generator of grade is demarcated；Meanwhile if acquisition system is multichannel collecting system, school is carried out to each passage
Just, correction coefficient is obtained respectively.
Beneficial effects of the present invention：
The method that the method for the present invention uses correction coefficient, frequency correction is carried out to vibrating wire acquirer, solved because of acquisition system
Error problem caused by itself crystal oscillator, circuit difference, the precision and uniformity of acquisition system are improved, according to practical application,
Using the reachable ± 0.05Hz of collecting device frequency collection precision of this method, engineering survey requirement is complied fully with.
Brief description of the drawings
Fig. 1 is the functional block diagram of the present invention；
In figure：1- standard signal sources, 2- are acquired to standard signal, the collection value after 3-EEPORM memories, 4- correction.
Embodiment
The present invention will be described in detail below in conjunction with the accompanying drawings：
A kind of frequency calibrating method of vibrating wire acquirer, this method are as follows：
Demarcated using standard signal source, obtain corresponding correction coefficient, and be stored in EEPROM；
In normal acquisition, frequency calibration is carried out according to correction coefficient, obtains finally gathering output valve, to improve frequency collection
Precision；
The indicating value of the corresponding output collection of Acquisition Instrument now to be corrected, the indicating value is uncorrected, then by standard signal frequency
The indicating value of value output collection corresponding with Acquisition Instrument to be corrected, the indicating value is uncorrected, carries out linear fit, it is public to obtain fitting
Formula：The uncorrected collection indicating values of standard value=correction factor *, to obtain correction factor；
After correction coefficient is obtained, correction coefficient is written in eeprom memory 3 or other memories, as follow-up tune
With storing correction coefficient respectively according to channel number；When under normal acquisition pattern, after Acquisition Instrument collects original frequency value, then
According to corresponding channel number, correction coefficient corresponding to lookup, the uncorrected calculating side for gathering indicating value is multiplied by according to correction factor
Formula, the frequency values after being corrected.
Further, it is the outputting standard signal of ± 0.01Hz standard signal sources 1 that this method, which needs to use output accuracy, according to
500Hz, 1kHz, 1.5kHz, 2kHz, 2.5kHz, 3kHz, 3.5 kHz, 4 kHz are exported.
Further, this method needs to use Acquisition Instrument to be corrected to be acquired 2 to standard signal, is not carried out school
Positive collection indicating value, and be fitted with standard value, fitting coefficient is obtained, its fundamental relation is：Standard value=correction factor * is not
The collection indicating value of correction, so as to obtain correction coefficient.
Further, the acquisition precision and uniformity of acquisition system are improved, when in use, uses same or same precision
The signal generator of grade is demarcated；Meanwhile if acquisition system is multichannel collecting system, school is carried out to each passage
Just, correction coefficient is obtained respectively.
After correction coefficient is obtained, it is necessary to be corrected to the indicating value of collection during normal acquisition, it is multiplied by according to correction factor
The method of uncorrected collection indicating value is calculated, and finally gives the collection value 4 after correction.
When being corrected, further to improve the accuracy of correction, the higher standard signal source of precision can be used to carry out
Demarcation reference.The exponent number of demarcation can be increased simultaneously, demarcation can be corrected by the even lower steppings of 100Hz.
This method is in actual use, the indicating value of standard signal frequency values output collection corresponding with Acquisition Instrument to be corrected
（It is uncorrected）Linear fit is employed when being fitted can meet to require, if thinking further to improve precision or in higher frequency
In the range of rate, usable fitting of a polynomial is corrected.
Claims (4)
1. a kind of frequency calibrating method of vibrating wire acquirer, it is characterised in that this method is as follows：
Demarcated using standard signal source, obtain corresponding correction coefficient, and be stored in EEPROM；
In normal acquisition, frequency calibration is carried out according to correction coefficient, obtains finally gathering output valve, to improve frequency collection
Precision；
The indicating value of the corresponding output collection of Acquisition Instrument now to be corrected, the indicating value is uncorrected, then by standard signal frequency
The indicating value of value output collection corresponding with Acquisition Instrument to be corrected, the indicating value is uncorrected, carries out linear fit, it is public to obtain fitting
Formula：The uncorrected collection indicating values of standard value=correction factor *, to obtain correction factor；
After correction coefficient is obtained, correction coefficient is written in EEPROM or other memories, as follow-up calling, that is, pressed
Correction coefficient is stored respectively according to channel number；When under normal acquisition pattern, after Acquisition Instrument collects original frequency value, further according to corresponding
Channel number, correction coefficient corresponding to lookup, according to correction factor be multiplied by it is uncorrected collection indicating value calculation, obtain school
Frequency values after just.
2. the frequency calibrating method of vibrating wire acquirer according to claim 1, it is characterised in that：This method needs to use defeated
It is ± 0.01Hz standard signal source outputting standard signals to go out precision, according to 500Hz, 1kHz, 1.5kHz, 2kHz, 2.5kHz,
3kHz, 3.5 kHz, 4 kHz are exported.
3. the frequency calibrating method of vibrating wire acquirer according to claim 1, it is characterised in that：This method, which needs to use, to be treated
The Acquisition Instrument of correction is acquired to standard signal, the collection indicating value not being corrected, and is fitted with standard value, is obtained
To fitting coefficient, its fundamental relation is：The uncorrected collection indicating values of standard value=correction factor *, so as to obtain correction coefficient.
4. the frequency calibrating method of vibrating wire acquirer according to claim 1, it is characterised in that：Improve adopting for acquisition system
Collect precision and uniformity, when in use, demarcated using the signal generator of same or same accuracy class；Meanwhile if
Acquisition system is multichannel collecting system, and each passage is corrected, obtains correction coefficient respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017104179391 | 2017-06-06 | ||
| CN201710417939 | 2017-06-06 |
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| Publication Number | Publication Date |
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| CN107884118A true CN107884118A (en) | 2018-04-06 |
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| CN201710907784.XA Pending CN107884118A (en) | 2017-06-06 | 2017-09-29 | A kind of frequency calibrating method of vibrating wire acquirer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270503A (en) * | 2018-07-13 | 2019-01-25 | 中国船舶重工集团公司第七〇九研究所 | A kind of frequency compensation method, power detection device and radar system |
| CN117433623A (en) * | 2023-12-21 | 2024-01-23 | 福建省计量科学研究院（福建省眼镜质量检验站） | High-precision measuring and reading instrument calibrating device based on instant suppression |
-
2017
- 2017-09-29 CN CN201710907784.XA patent/CN107884118A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270503A (en) * | 2018-07-13 | 2019-01-25 | 中国船舶重工集团公司第七〇九研究所 | A kind of frequency compensation method, power detection device and radar system |
| CN117433623A (en) * | 2023-12-21 | 2024-01-23 | 福建省计量科学研究院（福建省眼镜质量检验站） | High-precision measuring and reading instrument calibrating device based on instant suppression |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180406 |
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| WD01 | Invention patent application deemed withdrawn after publication |