CN104154987B - A kind of vibrating string type sensor plate reading - Google Patents
A kind of vibrating string type sensor plate reading Download PDFInfo
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- CN104154987B CN104154987B CN201410327902.6A CN201410327902A CN104154987B CN 104154987 B CN104154987 B CN 104154987B CN 201410327902 A CN201410327902 A CN 201410327902A CN 104154987 B CN104154987 B CN 104154987B
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Abstract
A kind of vibrating string type sensor plate reading, including the data collection station with single-chip microcomputer as control centre and host computer；Data collection station, including excitation chain, signal amplification shaping circuit, temperature collection circuit, single-chip microcomputer and signal circuit；Excitation chain, uses the method for high pressure to make vibrating string type sensor produce resonance；Signal amplification shaping circuit, the frequency signal exported by vibrating string type sensor amplifies and shaping；Temperature collection circuit, measures the resistance of the negative-characteristic thermistor of the vibrating string type sensor with temperature adjustmemt；Single-chip microcomputer is built-in with frequency measuring block and temperature-measuring module, for controlling excitation chain, the signal gathering signal amplification shaping circuit output and the signal of temperature collection circuit output, is calculated measured temperature and frequency values；Signal circuit, is calculated measured temperature by described single-chip microcomputer and frequency values data pass to host computer；Host computer built-in engineering management module.The present invention can be used for the measurement in large-scale engineering to vibrating string type sensor.
Description
Technical field
The present invention relates to a kind of vibrating string type sensor plate reading, belong to the technical field of engineering survey.
Background technology
Vibrating string type sensor is a kind of by other physical quantity, such as pressure, moment of torsion etc., is converted into the sensing of frequency
Device.What vibrating string type sensor directly exported is the oscillation frequency signal of vibratory string, therefore have capacity of resisting disturbance strong,
Affected the features such as little, stable and reliable for performance, vibration resistance, life-span length by electrical quantity, thus obtained in engineering
It is widely applied.The work process of vibrating string type sensor is: first makes its exciting, then receives its frequency returned letter
Number, measure resonant frequency, finally via calibration formula computing to obtain corresponding physical quantity to be measured.
The plate reading being currently used for measuring vibrating string type sensor can only simply measure frequency, or is aided with measurement temperature
Degree is corrected, and such as application publication number is the patent of invention of CN102426052A.But gauger is true
Just be concerned about is not frequency values and the temperature value directly measuring gained, but the physical quantity gone out in prediction on such basis
Value.Thus, survey crew often also needs to paper pen and records measured value, looks into parameter list and obtains relevant parameter, then
Utilize calibration formula computing, the required magnitude of physical quantity of final acquisition.But, in an engineering, often have up to a hundred
Individual sensor, and almost it is required for every day one to double measurement, thus this metering system can consume substantial amounts of
Time and efforts.
Additionally, existing instrument can not effectively manage the measurement of the large-scale engineering being provided with big measurement point.Bulletin
Number for each measurement it is provided with independent in engineering a little for the patent of invention of CN102401692A how measuring
Passage, but number of active lanes has the upper limit.And, the parameter list of vibrating string type sensor composition used in measurement
And surveying record, often it is stored on paper list or computer electrical form, separates with plate reading, it is impossible to
Analysis is consulted when measuring.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of vibrating string type sensor plate reading, it is therefore intended that utilize
Vibrating string type sensor the most directly measures magnitude of physical quantity, and can be used for during heavy construction is measured sensor and measurement
Record is managed.
Technical scheme is as follows:
A kind of vibrating string type sensor plate reading, including the data collection station with single-chip microcomputer as control centre and upper
Machine；
Described data collection station, including excitation chain, signal amplification shaping circuit, temperature collection circuit, list
Sheet machine and signal circuit；
Described excitation chain, uses the method for high pressure to make vibrating string type sensor produce resonance, and preferred high pressure is
120V；
Described signal amplification shaping circuit, the frequency signal exported by vibrating string type sensor amplifies and shaping；
Described temperature collection circuit, measures the negative-characteristic thermistor of the vibrating string type sensor with temperature adjustmemt
Resistance, and the resistance data after single-chip microcomputer output A/D sampling；
Described single-chip microcomputer is built-in with frequency measuring block and temperature-measuring module, is used for controlling excitation chain, collection
The signal of signal amplification shaping circuit output and the signal of temperature collection circuit output, and it is calculated measured temperature
And frequency values；
Described signal circuit, passes to calculated for described single-chip microcomputer measured temperature and frequency values data
Position machine；
Described host computer built-in engineering management module.
According to currently preferred, the frequency measuring block that described single-chip microcomputer is built-in, job step is as follows:
(1) single-chip microcomputer initializes, and connects including the initialization of external interrupt, the initialization of intervalometer and peripheral hardware
The initialization of mouth；
(2) set automatic gear shifting M gear altogether, be followed successively by N from small to large1,N2,...,NM；Set
Subtotal figure threshold value is nr, set the timed interval T of timerc；
(3) initializing current gear sequence number i=1, gear value is Ni；
(4) Single-chip Controlling high-pressure generating circuit produces high pressure, exciting vibrating string type sensor；
(5) signal amplification shaping circuit, the frequency signal exported by vibrating string type sensor amplifies and shaping,
Obtain tested square-wave signal；
(6) open single-chip microcomputer external interrupt and timer, interrupt using edge-triggered mode, square-wave signal
Rising edge or trailing edge trigger and interrupt, and interrupt counter starts to enter the tested square-wave signal cycle
Row counting, is worth for N；Timer starts time interval TcCounting, is worth for n；
(7) counter counts counts to N=Ni+ 1, i.e. NiDuring+1 external interrupt, close timer and meter
Number device；Now the count value of timer is n, i.e. amounts to the most a length of nTc；
(8) count value n and least count threshold value n of timer are judgedrSize, if n is less than nr, then
Enter step (9), otherwise enter step (10)；
(9) tuning up gear sequence number, i.e. i=i+1, changing corresponding gear value is Ni, go to step (6)；
(10) calculate by measured frequencyWherein N is the count value in tested square-wave signal cycle, TcFor
The timed interval of the single-chip microcomputer timer set, n is single-chip microcomputer timer count value.
The temperature-measuring module that described single-chip microcomputer is built-in, job step is as follows:
(1) resistance value of negative-characteristic thermistor is input to single-chip microcomputer through A/D change-over circuit；
(2) temperature value is obtained by fitting formulaWherein R is real
The quick resistance of calorimetric, parameter A, B, C rely on temperature resistance synopsis matching to obtain.
According to currently preferred, the engineering management module that described host computer is built-in, its job step is as follows:
(1) engineering is created；
(2) parameter list data base and measured value data base are created；Described parameter list data base, for storage
Know that parameter, every record comprise sensor number, transducer calibration coefficient of frequency K, sensor
Spot frequency modulus initial value F0, transducer calibration temperature correction coefficient b, transducer calibration temperature
Initial value T0, the vibratory string number of vibrating string type sensor, critesistor nominal resistance；Described measured value
Data base, is used for preserving and checking measurement data acquired, every record include sensor number,
Practical frequency, practical frequency modulus value, observed temperature value, actual measurement magnitude of physical quantity, measure the time,
Pragmatic information；
(3) open engineering, select required function: if select " measurement " function, then enter step (4)-
(8)；If selecting " checking historical record " function, then enter step (9)-(10)；If
Select " Maintenance of parameter tables " function, then enter step (11)-(12)；
(4) enter measurement interface, choose the numbering of institute's vibration measuring string type sensor；
(5) read single-chip data, it is thus achieved that practical frequency value f and observed temperature value T, and calculate frequency mould
Numerical value F=f2/1000；
(6) search parameter list data base according to sensor number, obtain vibrating string type sensor parameter, including:
Transducer calibration coefficient of frequency K, transducer calibration frequency modulus initial value F0, transducer calibration temperature
Degree correction factor b, transducer calibration temperature initial value T0；
(7) by the calibration formula P=K (F-F of vibrating string type sensor0)+b(T-T0) calculate respective physical amount
Value, wherein, K is transducer calibration coefficient of frequency, F0Be transducer calibration frequency modulus initial value,
B is transducer calibration temperature correction coefficient, T0It is that transducer calibration temperature initial value, F are for surveying
Frequency modulus value and T represent observed temperature；
(8) during surveying record is saved in measured value data base；
(9) log file is selected；
(10) display log file；
(11) parameter list data base is opened；
(12) add or revise parameter list.
Compared with prior art, the present invention has an advantages below:
1, measurement result accurate stable, frequency measurement wide ranges.Use new frequency measurement scheme, adaptive by signal frequency
Frequency measurement gear should be adjusted, higher frequency measurement can be obtained and differentiate.
2, the automatic computing measuring physical quantity shows.Can create parameter list when setting up engineering simultaneously, thus
During measurement, while display frequency, frequency modulus and temperature value, real-time operation showing on host computer
Show surveyed respective physical value.
3, complete data message.Each data all contains period, sensor type, measurement parameter, survey
The information such as amount time, measured value and computing gained magnitude of physical quantity, data are comprehensive, and can effectively embody physical quantity
Change procedure.
4, efficient data management.Rely on database technology, can manage in large-scale engineering the most uniformly
Each sensor parameters measuring point, inquires about measurement data accurately, and can delete Data Entry and amendment correction.
Accompanying drawing explanation
Fig. 1, the structure chart of a kind of vibrating string type sensor plate reading of the present invention；
The frequency measuring block flow chart that Fig. 2, single-chip microcomputer of the present invention are built-in；
The flow chart of the engineering management module that Fig. 3, host computer of the present invention are built-in.
Detailed description of the invention
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited to this.
Embodiment 1,
As it is shown in figure 1, a kind of vibrating string type sensor plate reading of the present invention, in single-chip microcomputer for control
The data collection station A of the heart and control are measured and process the host computer B of data, and data collection station is with upper
Machine is communicated by serial communication protocol.
The described acquisition terminal with single-chip microcomputer as control centre includes that single-chip microcomputer 1, excitation chain 2, signal are put
Big shaping circuit 4, temperature collection circuit 5 and signal circuit 6；
MSP430F148 chip selected by described single-chip microcomputer 1, can be effectively reduced power consumption.
Described excitation chain 2 contains high-pressure generating circuit and the discharge network being made up of controllable silicon, uses high pressure to swash
The vibrating string type sensor 3 that the mode exciting engineering site shaken is installed.The preferably measurement cycle is 1.5s: wherein 1s
It is supplied to high-pressure generating circuit so that it is having enough time to produce high pressure, preferably high pressure is 120V；Remaining 0.5s
Control discharge circuit electric discharge generation high-voltage pulse and make vibrating string type sensor starting of oscillation.
The filter and amplification network that described signal amplification circuit 4 is made up of integrated operational amplifier, it is right to be used for realizing
The exciting feedback signal of vibrating string type sensor carries out super-high power amplification, exports square-wave signal.
Described temperature collection circuit 5 gathers the A/D sampled value of negative tempperature coefficient thermistor.
Described signal circuit 6 is the communication interface of host computer and single-chip microcomputer, will by PL2303HXD chip
Serial signal is converted to usb signal from TTL form, uses the data that serial port protocol transmission gathers, including institute
Measured frequency value and temperature value.
The built-in frequency measuring block of described single-chip microcomputer and temperature-measuring module.
The frequency measuring block that described single-chip microcomputer is built-in, as in figure 2 it is shown, job step is as follows:
(1) single-chip microcomputer initializes, and connects including the initialization of external interrupt, the initialization of intervalometer and peripheral hardware
The initialization of mouth；
(2) set 5 gears of automatic gear shifting, be respectively as follows: a grade N1=120, shelves N2=240, shelves N3=480,
Shelves N4=975 and shelves N5=1980, corresponding frequency measurement scope is respectively as follows: 350～610.3Hz,
610～1220.7Hz, 1220～2441.4Hz, 2440～4959.1Hz and 4959～8000
Hz.Set the timed interval T of timerc, preferably 1us, set least count threshold value
For nr, reference count value is 0x30000 (hexadecimal number)；
(3) initializing current gear i=1, corresponding gear value is 120；
(4) Single-chip Controlling high-pressure generating circuit produces high pressure, exciting vibrating string type sensor；
(5) signal amplification shaping circuit, the frequency signal exported by vibrating string type sensor amplifies and shaping,
Obtain tested square-wave signal；
(6) open single-chip microcomputer external interrupt and timer, interrupt using edge-triggered mode, square-wave signal
Rising edge or trailing edge trigger and interrupt, and interrupt counter starts to enter the tested square-wave signal cycle
Row counting, is worth for N；Timer starts time interval TcCounting, is worth for n；
(7) counter counts counts to N=Ni+ 1, i.e. NiDuring+1 external interrupt, close timer and meter
Number device.Now the count value of timer is n, i.e. amounts to the most a length of nTc；
(8) count value n and least count threshold value n of timer are comparedr=0x30000 (hexadecimal number)
Size, if n is less than nr, then enter step (9), otherwise enter step (10)；
(9) tuning up gear sequence number, i.e. i=i+1, changing corresponding gear value is Ni, go to step (6)；
(10) calculate by measured frequencyWherein N is the count value in tested square-wave signal cycle, TcFor
The timed interval of the single-chip microcomputer timer set, n is single-chip microcomputer timer count value.
The temperature-measuring module that described single-chip microcomputer is built-in, job step is as follows:
(1) resistance value of negative-characteristic thermistor is input to single-chip microcomputer through A/D change-over circuit；
(2) temperature value is obtained by fitting formulaWherein R is real
The quick resistance of calorimetric, parameter A, B, C rely on temperature resistance synopsis matching to obtain.
Described host computer B is the Android panel computer with OTG function.The engineering pipe that host computer is built-in
Reason module, is application program based on Android intelligence system.Data base administration uses Android system
The SQLite nucleus module embedded in system.
The engineering management module that described host computer is built-in, as shown in Figure 3, its job step is as follows:
(1) engineering is created；
(2) parameter list data base and measured value data base are created；Described parameter list data base, for storage
Know that parameter, every record comprise sensor number, transducer calibration coefficient of frequency K, sensor
Spot frequency modulus initial value F0, transducer calibration temperature correction coefficient b, transducer calibration temperature
Initial value T0, the vibratory string number of vibrating string type sensor, critesistor nominal resistance；Described measured value
Data base, is used for preserving and checking measurement data acquired, every record include sensor number,
Practical frequency, practical frequency modulus value, observed temperature value, actual measurement magnitude of physical quantity, measure the time,
Pragmatic information；
(3) open engineering, select required function: if select " measurement " function, then enter step (4)-
(8)；If selecting " checking historical record " function, then enter step (9)-(10)；If
Select " Maintenance of parameter tables " function, then enter step (11)-(12)；
(4) enter measurement interface, choose the numbering of institute's vibration measuring string type sensor；
(5) read single-chip data, it is thus achieved that practical frequency value f and observed temperature value T, and calculate frequency mould
Numerical value F=f2/1000；
(6) search parameter list data base according to sensor number, obtain vibrating string type sensor parameter, including:
Transducer calibration coefficient of frequency K, transducer calibration frequency modulus initial value F0, transducer calibration temperature
Degree correction factor b, transducer calibration temperature initial value T0；
(7) by the calibration formula P=K (F-F of vibrating string type sensor0)+b(T-T0) calculate respective physical amount
Value, wherein, K is transducer calibration coefficient of frequency, F0Be transducer calibration frequency modulus initial value,
B is transducer calibration temperature correction coefficient, T0It is that transducer calibration temperature initial value, F are for surveying
Frequency modulus value and T represent observed temperature；
(8) during surveying record is saved in measured value data base；
(9) log file is selected；
(10) display log file；
(11) parameter list data base is opened；
(12) add or revise parameter list.
Embodiment 2,
A kind of vibrating string type sensor plate reading, its difference is, described host computer B
Selecting the Android intelligent having bluetooth communication mode, described measuring terminals A is provided with bluetooth communication,
Powered by battery system.
Claims (2)
1. a vibrating string type sensor plate reading, this plate reading includes the data acquisition with single-chip microcomputer as control centre
Collection terminal and host computer；
Described data collection station, including excitation chain, signal amplification shaping circuit, temperature collection circuit, list
Sheet machine and signal circuit；
Described excitation chain, uses the method for high pressure to make vibrating string type sensor produce resonance, and high pressure is 120V；
Described signal amplification shaping circuit, the frequency signal exported by vibrating string type sensor amplifies and shaping；
Described temperature collection circuit, measures the negative-characteristic thermistor of the vibrating string type sensor with temperature adjustmemt
Resistance, and the resistance data after single-chip microcomputer output A/D sampling；
Described single-chip microcomputer is built-in with frequency measuring block and temperature-measuring module, is used for controlling excitation chain, collection
The signal of signal amplification shaping circuit output and the signal of temperature collection circuit output, and it is calculated measured temperature
And frequency values；
Described signal circuit, passes to calculated for described single-chip microcomputer measured temperature and frequency values data
Position machine；
Described host computer built-in engineering management module；
The frequency measuring block that described single-chip microcomputer is built-in, job step is as follows:
(1) single-chip microcomputer initializes, and connects including the initialization of external interrupt, the initialization of intervalometer and peripheral hardware
The initialization of mouth；
(2) set automatic gear shifting M gear altogether, be followed successively by N from small to large1,N2,...,NM；Set
Subtotal figure threshold value is nr, set the timed interval T of timerc；
(3) initializing current gear sequence number i=1, gear value is Ni；
(4) Single-chip Controlling high-pressure generating circuit produces high pressure, exciting vibrating string type sensor；
(5) signal amplification shaping circuit, the frequency signal exported by vibrating string type sensor amplifies and shaping,
Obtain tested square-wave signal；
(6) open single-chip microcomputer external interrupt and timer, interrupt using edge-triggered mode, square-wave signal
Rising edge or trailing edge trigger and interrupt, and interrupt counter starts to enter the tested square-wave signal cycle
Row counting, is worth for N；Timer starts time interval TcCounting, is worth for n；
(7) counter counts counts to N=Ni+ 1, i.e. NiDuring+1 external interrupt, close timer and meter
Number device；Now the count value of timer is n, i.e. amounts to the most a length of nTc；
(8) count value n and least count threshold value n of timer are judgedrSize, if n is less than nr, then
Enter step (9), otherwise enter step (10)；
(9) tuning up gear sequence number, i.e. i=i+1, changing corresponding gear value is Ni, go to step (6)；
(10) calculate by measured frequencyWherein N is the count value in tested square-wave signal cycle, TcFor
The timed interval of the single-chip microcomputer timer set, n is single-chip microcomputer timer count value.
A kind of vibrating string type sensor plate reading the most according to claim 1, it is characterised in that described is upper
The engineering management module that position machine is built-in, its job step is as follows:
(1) engineering is created；
(2) parameter list data base and measured value data base are created；Described parameter list data base, for storage
Know that parameter, every record comprise sensor number, transducer calibration coefficient of frequency K, sensor
Spot frequency modulus initial value F0, transducer calibration temperature correction coefficient b, transducer calibration temperature
Initial value T0, the vibratory string number of vibrating string type sensor, critesistor nominal resistance；Described measured value
Data base, is used for preserving and checking measurement data acquired, every record include sensor number,
Practical frequency, practical frequency modulus value, observed temperature value, actual measurement magnitude of physical quantity, measure the time,
Pragmatic information；
(3) open engineering, select required function: if select " measurement " function, then enter step (4)-
(8)；If selecting " checking historical record " function, then enter step (9)-(10)；If
Select " Maintenance of parameter tables " function, then enter step (11)-(12)；
(4) enter measurement interface, choose the numbering of institute's vibration measuring string type sensor；
(5) read single-chip data, it is thus achieved that practical frequency value f and observed temperature value T, and calculate frequency mould
Numerical value F=f2/1000；
(6) search parameter list data base according to sensor number, obtain vibrating string type sensor parameter, including:
Transducer calibration coefficient of frequency K, transducer calibration frequency modulus initial value F0, transducer calibration temperature
Degree correction factor b, transducer calibration temperature initial value T0；
(7) by the calibration formula P=K (F-F of vibrating string type sensor0)+b(T-T0) calculate respective physical amount
Value, wherein, K is transducer calibration coefficient of frequency, F0Be transducer calibration frequency modulus initial value,
B is transducer calibration temperature correction coefficient, T0It is that transducer calibration temperature initial value, F are for surveying
Frequency modulus value and T represent observed temperature；
(8) during surveying record is saved in measured value data base；
(9) log file is selected；
(10) display log file；
(11) parameter list data base is opened；
(12) add or revise parameter list.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136281B (en) * | 2015-10-14 | 2018-03-02 | 基康仪器股份有限公司 | The frequency measuring equipment and method of vibrating string type sensor |
| CN105486334B (en) * | 2015-12-01 | 2017-11-10 | 常州大学 | A kind of rapid measurement device on vibrating wire sensor frequency |
| CN108153179A (en) * | 2016-12-05 | 2018-06-12 | 中核兰州铀浓缩有限公司 | Centrifuge uranium enrichment Frequency Measurement System control unit |
| CN106840230A (en) * | 2017-02-24 | 2017-06-13 | 河北稳控科技有限公司 | The signal processing apparatus and method of a kind of vibrating string type sensor |
| CN107462341A (en) * | 2017-07-31 | 2017-12-12 | 成都众邦凯测科技有限公司 | A kind of jamproof vibratory string acquisition system |
| CN108633814A (en) * | 2018-03-21 | 2018-10-12 | 青岛海尔科技有限公司 | Control method, device, system, storage medium and the Intelligent fish tank of Intelligent fish tank |
| CN109060197A (en) * | 2018-06-25 | 2018-12-21 | 中国海洋大学 | A kind of separated wireless transmission type vibration wire frequency plate reading with computing function |
| CN109580085A (en) * | 2018-10-17 | 2019-04-05 | 广州中海达定位技术有限公司 | A kind of antinoise measurement method, electronic equipment and storage medium based on vibrating string type sensor |
| CN115346348B (en) * | 2022-08-09 | 2023-08-18 | 郑州航空工业管理学院 | Monitoring device for civil structure |
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