CN106289034B - A kind of low-power consumption vibration wire sensor and its excitation detection method - Google Patents
A kind of low-power consumption vibration wire sensor and its excitation detection method Download PDFInfo
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- CN106289034B CN106289034B CN201610619720.5A CN201610619720A CN106289034B CN 106289034 B CN106289034 B CN 106289034B CN 201610619720 A CN201610619720 A CN 201610619720A CN 106289034 B CN106289034 B CN 106289034B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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Abstract
The invention discloses a kind of low-power consumption vibration wire sensor, including vibratory string, coil and sensor housing, exciting circuit unit, pick-up circuit unit and main control unit；Main control unit includes pre- module of shaking, shake module, frequency detection module and signal processing module again, signal processing module record effectively answers vibration frequency signal, the excitation testing process of sensor is controlled at the same time, sensor is set to work under stable state and unstable state both of which, and resonance frequency value, the driving frequency value of module of shaking again when steady state operating mode is calculated output are effectively answered according to record.The present invention provides a kind of vibrating string type sensor of low-power consumption, vibratory string incentive mode is changed, traditional low pressure scanning frequency excitation mode is changed into the pre- energisation mode for shaking and combining and shaking again, and detects frequency values when shaking in advance as the driving pulse frequency shaken again, so as to play energy saving effect.
Description
Technical field
The invention belongs to sensor technical field, and in particular to a kind of for the displacement of works or the vibratory string of deformation measurement
Sensor.
Background technology
In the routine servicing of large structure, the deformation or displacement measurement to its critical component are particularly significant, it is above-mentioned by
The stress size and changes in distribution of power component most directly reflect the health status of structure, therefore to the force-bearing situation of these components
Monitor and safety analysis assessment on this basis is of great significance.
The sensing element of vibrating string type sensor is an one metal wire string at present, it is connected fixation with force acting on transducer component,
Various physical quantitys are measured using the external tension relational expression suffered by the natural frequency of vibration and string wire of string wire, vibrating string type sensor is mesh
It is preceding in one of dynamometry application side sensor the most advanced, this sensor output is frequency signal, therefore its is anti-interference
Ability is strong, and temperature drift, drift are small, influenced by electrical parameter it is small, it is stable and reliable for performance, adapt to long-term observation and long distance under mal-condition
From test, thus be widely used in the ess-strain of the engineerings such as reservoir dam, port engineering, bridge, foundation pit, deformation, seepage flow,
In the monitoring of liquid level etc..
Vibrating string type sensor encourages principal low-pressure scanning frequency excitation mode, and low pressure scanning frequency excitation is the intrinsic frequency according to sensor
Rate selects suitable frequency band, applies the scanning frequency pulse string signal that the frequency of 5V becomes larger to sensor, when accumulation signal
When frequency and the close intrinsic frequency of string wire, string wire can be rapidly achieved resonance state, and amplitude is maximum under resonance state, can produce compared with
Big induced electromotive force, the frequency signal noise of sensor output are higher and easy to measurement.
But since swept-frequency signal is the continuous impulse signal from lower-frequency limit to upper frequency limit, in order to ensure that exciting is imitated
Fruit, the pulse of each frequency will continue several cycles, and the exciting time is too long, causes energy consumption big, limits the sensor and exists
Application in long-range unattended measuring system, in order to improve the wear life of battery, saves energy consumption, it is necessary to which type vibration wire is sensed
The electric excitation mode of device is improved.
The 1st phase of volume 23 in 2010《Sensor technology journal》Upper " vibrating string type sensor exciting policy optimization " Wen Zhonggong
A kind of vibrating wire sensor frequency detecting scheme for being combined preliminary survey and repetition measurement has been opened, one is first obtained by the way of low pressure is manipulated the strings
A vibration frequency initial value, then secondary low-voltage is carried out with the initial value and is manipulated the strings excitation, so as to obtain the scheme of exact value, the program
Although higher measurement accuracy can be obtained, encourage and detect, energy consumption or higher twice due to needing to carry out every time,
Therefore the detection demand of the field unattended such as bridge under being difficult in adapt to soft phase.
The content of the invention
It is an object of the invention to overcome the power consumption that existing vibrating string type sensor mesolow scanning frequency excitation mode has high, difficult
With the deficiency of long-range long term monitoring, a kind of vibrating string type sensor of low-power consumption is proposed, it is real by the optimization design to energisation mode
Low-power consumption, the measurement of high-precision Displacement-deformation are showed.
The technical solution that the present invention takes is as follows：
A kind of low-power consumption vibration wire sensor, including vibratory string, coil and sensor housing, the vibratory string are fixed on sensor
The both ends of housing, coil are arranged on the middle part of vibratory string, and vibratory string is produced and encourages and detects the vibration of vibratory string, further includes exciting circuit
Unit, pick-up circuit unit and main control unit；The exciting circuit unit provides electric signal by coil for vibratory string starting of oscillation；Institute
The pick-up circuit unit stated obtains the frequency signal of vibratory string by coil；The main control unit includes pre- module of shaking, shake mould again
Block, frequency detection module and signal processing module, the output terminal of the exciting circuit unit and the input terminal for module of shaking in advance, shake again
The input terminal of module electrically connects, and the output terminal of the pick-up circuit unit and the input terminal of frequency detection module electrically connect, described
The output terminal of the output terminal of pre- module of shaking, module of shaking again output terminal and frequency detection module respectively with signal processing module Electricity Federation
Connect；The signal processing module record effectively answers vibration frequency signal, while controls the excitation testing process of sensor, makes biography
Sensor works under stable state and unstable state both of which, and effectively answers resonance frequency value according to record, is calculated next time steady
The driving frequency value of module of shaking again during state operating mode output.
In above-mentioned low-power consumption vibration wire sensor, unstable state operating mode is according to-pre- detection of shaking-inspection of shaking-shake again again of shaking in advance
Step is surveyed to carry out；The steady state operating mode is according to-the detecting step that shakes again progress of directly shaking again.
A kind of excitation detection method of low-power consumption vibration wire sensor, comprises the following steps：
[1] after sensor installation and debugging, it is preceding n times detection when, signal processing module control sensor according to shake in advance-
The unstable state pattern work of pre- detection of shaking-shake again-detection of shaking again, wherein the pulse electricity that the pumping signal shaken in advance is pulsewidth t1
Signal, the frequency for detection of shaking in advance is Fi, the pumping signal shaken again is frequency of oscillation Fi, pulsewidth t2 electric signal, shake again detection frequency
fiIt is this measurement as a result, wherein n and i are positive integer, i is measurement the time；
[2] i is worked as>During n, sensor according to directly shake again-equilibrium mode of detection of shaking again works, wherein the excitation letter that shakes again
Number pulsewidth be t2, driving frequency FiMeasured according to first n times and obtain the moving average access of frequency values：Fi=(fi-n+ ...
+ fi-2+fi-1)/n, and the frequency measurement for obtaining this time is fi；
[3] if the multiple vibration frequency that detection obtains in step [2] exceeds the working range of sensor, or the signal value that shakes again
It is weak to being difficult to normally detect, then this time measurement is invalid, and sensor according to shaking in advance-detection of shaking in advance-shakes again-detection of shaking again it is non-
Equilibrium mode works, otherwise sensor according to directly shake again-equilibrium mode of detection of shaking again works；
[4] every time after measurement, the frequency values f of this time is recordediCalculating for Subsequent activations signal frequency.
In the excitation detection method of above-mentioned low-power consumption vibration wire sensor, shake the excitation pulsewidth t1 and excitation pulsewidth t2 that shakes again in advance,
Obtained according to the calibration experiment to sensor.
In the excitation detection method of above-mentioned low-power consumption vibration wire sensor, n=10,20 or 50.
In the excitation detection method of above-mentioned low-power consumption vibration wire sensor, the excitation pulsewidth t1 that shakes in advance is 100-200ms, is shaken again sharp
It is 200-500ms to encourage pulsewidth t2.
The advantageous effects that the present invention has are as follows：
First, the present invention provides it is a kind of according to moving average predict measurement frequency low-power consumption vibrating string type sensor,
Vibratory string incentive mode is changed, traditional low pressure scanning frequency excitation mode is changed into the pre- energisation mode for shaking and combining and shaking again,
And frequency values when shaking in advance are detected as the driving pulse frequency shaken again, so as to play energy saving effect.At the same time according to n times first
The calculating of the moving average of measurement result, prediction obtain measurement frequency next time, and when controlling repetition measurement according to the frequency values
Excited oscillation frequency, experience is pre- to shake and the measuring method for two steps of shaking again compared to being required for every time, further functioned as it is energy saving and
Improve the effect of the frequency.
2nd, measurement parameter of the present invention in the displacement of the large structure such as bridge, building and shape changing detection slowly becomes
The characteristics of change so that sensor is operated under two kinds of operating modes of stable state and unstable state, in steady operation, using directly multiple
Shake-shake again detection incentive mode, and the average that the signal to shake again is preceding n practical frequency, there is frequency only under equilibrium mode
Rate measurement result error either because the driving frequency shaken again is improper cause detect signal too it is weak can not normally detect when,
Switch to pre- shake-pre- detection of shaking-shake again-the unstable state pattern of detection of shaking again under work so that be averaged to daily measurement work(
Consumption minimizes, and meets work long hours requirement of the sensor under the conditions of unattended, battery powered, while be also adapted to
The change of the vibratory string frequency occurred because sensor ageing.
3rd, during present invention measurement, calibration is measured to sensor, obtains sensor in operating frequency range most
The small pre- excitation pulsewidth t1 and excitation pulsewidth t2 that shakes again that shakes, it is ensured that while sensor can work normally, saved system power dissipation.
4th, either under stable state or unstable state pattern, of the invention answering is shaken being total to of driving pulse frequency and actual string wire
Vibration frequency approaches, it is ensured that the signal obtained during excitation has larger amplitude, greatly improves measurement accuracy.
Brief description of the drawings
Fig. 1 is the principle schematic of low-power consumption vibration wire sensor of the present invention.
Fig. 2 is the excitation testing process of low-power consumption vibration wire sensor of the present invention.
Fig. 3 is the power consumption electric current sequence diagram under unstable state pattern of the present invention.
Fig. 4 is the power consumption electric current sequence diagram under equilibrium mode of the present invention.
In figure：1-vibratory string；2-coil；3-sensor housing；4-exciting circuit unit；5-pick-up circuit unit；
6-main control unit
Embodiment
As shown in Figure 1, vibrating string type sensor belongs to frequency type sensor, can it is equivalent into a both ends frequency with steel wire tension
The vibration string wire of change, including vibratory string 1, coil 2 and sensor housing 3, vibratory string 1 are fixed on determining for the both ends of sensor housing 3
On the bearing of position, coil 2 is arranged on the middle part of vibratory string 1, and circuit produces pumping signal, and driving coil 2 produces the production of magnetic drive vibratory string
Raw vibration, and detect the vibration of vibratory string 1.
Under electric excitation, vibratory string 1 presses its natural frequency vibration, changes the tension force F of vibratory string 1, can obtain different vibrations
Frequency F, i.e. tension force and resonant frequency are into monotropic function relation.After vibratory string 1 is by tension length changes delta l, then haveWherein ρνFor the volume density of string, E is the elasticity modulus of vibratory string, and l is chord length.
During practical application, when the housing 3 of vibrating string type sensor is subject to dilatation, the positioning support at both ends is driven to produce
It is mobile, so as to cause vibratory string 1 to extend or shrink, by detecting the change of vibratory string frequency, to realize the measurement of displacement and deformation.When
When the frequency of signal and the intrinsic frequency of vibratory string are close, vibratory string is rapidly reached resonance state, vibrates the induced electromotive force of generation
Filtered, amplified by detection circuit, frequency measurement unit is given in shaping.What it is due to its output is frequency signal, has measurement can
Lean on, strong antijamming capability, it is low to cable requirement, be conducive to transmission and long-range the characteristics of measuring.
It is used in vibrating wire sensor in the long term monitoring of field, higher requirement is proposed to the power consumption of sensor, it is existing to shake
The low pressure scanning frequency excitation mode that string type sensor excitation is taken, the voltage pulse signal of generally use 5V, with vibrating wire sensor
Measurable low frequency starts frequency becomes larger, and scans to highest frequency, such as from 200 to 5000Hz, when reaching resonance state
The frequency signal of vibratory string is recorded, and is converted to the displacement of measurement, strain signal.
In order to reduce power consumption, as shown in Figure 1, the present invention improves the energisation mode of coil, main control unit includes
Pre- module of shaking, shake module, frequency detection module and signal processing module again, and signal processing module record effectively believe again by vibration frequency
Number, while the excitation testing process of sensor is controlled, sensor is worked under stable state and unstable state both of which, and according to note
Resonance frequency value, the driving frequency value of module of shaking again when steady state operating mode is calculated output are effectively answered in record.
The main thought of the present invention is from the point of view of energy saving, and energisation mode is divided into two kinds of moulds of stable state and unstable state
The operating mode of formula, wherein unstable state according to shaking in advance, and the step of detecting is shaken-shaken again to-pre- detection of shaking-to carry out again, stable state work
Operation mode is according to-the detecting step that shakes again progress of directly shaking again.
In unstable state operating mode, coil has been carried out first it is pre- shake, by the pre- module output one of shaking of main control unit control
A pulsewidth be t1 single pulse signal to exciting circuit unit 4, the signal promote coil by vibratory string attract deviate equilbrium position, open
Beginning shakes in advance, after shaking initial delay in advance for a period of time, frequency detection module by pick-up circuit unit 5 to the vibratory string frequency shaken in advance into
Row detection, obtains pre- vibration frequency, and then main control unit control shakes module one frequency of oscillation of output equal to pre- vibration frequency, pulsewidth again
The electric signal of t2 to exciting circuit unit, initial delay of shaking again for a period of time after, frequency detection module passes through pick-up circuit unit
The vibratory string frequency shaken again is detected, obtains this measurement frequency, displacement or deformation parameter is converted into and obtains this
Secondary measurement result.Due to having been obtained for a rough frequency by the main control unit of the detection to pre- vibration frequency, sensor
Value, then excitation of shaking is answered close to frequency by similar, it may be such that string wire produces resonance quickly, and tool is readily available during shaking again
There is the signal of higher magnitude, beneficial to the counting of frequency, and then improve measurement accuracy.
Although the above-mentioned pre- mode being combined of shaking and shake again is reduced at energy saving aspect than traditional scanning frequency excitation mode energy consumption
It is many, but if every time detection when will be shaken in advance excitation, and the t1 for excitation of shaking in advance is usually hundred ms grades, therefore understands band
Carry out larger power consumption.From the angle of practical implementation, it is contemplated that install to the sensing of the large structure such as bridge and building
Device is operated in the environment of a Relative steady-state in the overwhelming majority time, and the cycle of Sensor monitoring is second level, for normal
Vibrating wire sensor is installed for the large-sized structural parts of rule, such as on bridge to be detected with load, under normal conditions using hour to be single
The inviolent change of overload, the i.e. change in displacement of sensor are little in the relatively long time of position, that is to say, that stable state bar
The frequency values of actual measurement can approach in a period of time under part, therefore can save pre- the step of encouraging of shaking under limit completely, directly
Into the detection that shakes-shake again again, main control unit controls the module output pulse width t2 that shakes again, frequency of oscillation and above reality when shaking again
The electric signal that measured frequency is close is to exciting circuit unit, it is possible to realizes that string wire resonates, obtains displacement and deformation parameter.
As shown in Fig. 2, take into account the requirement of stable state and unstable state work, sensor excitation detection method, according to following step
It is rapid to carry out：
[1] the data accumulation stage：After sensor installation and debugging, it is preceding n times detection when, signal processing module control sensing
Device according to shaking in advance-pre- detection of shaking-shakes again-the unstable state pattern work of detection of shaking again, wherein the pumping signal shaken in advance is pulsewidth
The pulse electric signal of t1, the frequency for detection of shaking in advance is Fi, the pumping signal shaken again is frequency of oscillation Fi, pulsewidth t2 electric signal,
Detection frequency of shaking again fiIt is this measurement as a result, wherein n and i are positive integer, i is measurement the time；
[2] measurement under normal circumstances：Work as i>During n, sensor is according to-equilibrium mode the work of detection of shaking again of directly shaking again
Make, wherein the pulsewidth for pumping signal of shaking again is t2, driving frequency FiThe moving average for obtaining frequency values according to first n times measurement takes
Number：Fi=(fi-n+ ...+fi-2+fi-1)/n, and the frequency measurement for obtaining this time is fi；
[3] processing under abnormal condition：If the multiple vibration frequency that detection obtains in step [2] exceeds the work of sensor
Scope, or the signal value that shakes again are weak to being difficult to normally detect, then this time measurement is invalid, and sensor is according to-detection of shaking in advance-of shaking in advance
Shake again-unstable state the pattern of detection of shaking again work, otherwise sensor is according to-equilibrium mode the work of detection of shaking again of directly shaking again
Make；
[4] data are provided for measurement next time：Every time after measurement, the frequency values f of this time is recordediFor follow-up
Encourage the calculating of signal frequency.
For conventional large-sized structural parts, normal conditions lower sensor uses the operating mode of stable state, is only going out
Under existing emergency case, shake again the frequency number excitation using arithmetic rolling average when there is measurement result and exceed the specified frequency of sensor
Rate scope is either mismatched because of the driving frequency and the resonant frequency of string wire shaken again, leads to not resonate so that detection signal
It is too weak just to switch to unstable state operating mode when normally detect, once after the instantaneous unstable state stage, since arithmetic moves
The smoothing effect of dynamic average, automatically switches to the pattern of directly shaking again of stable state again quickly.It facts have proved that n takes 10,20 or 50 i.e.
It can meet measurement request, and there is preferable energy-saving effect.
As a kind of preferred embodiment, the present invention measures sensor calibration when measuring, obtains sensor and working
The minimum pre- excitation pulsewidth t1 and excitation pulsewidth t2 that shakes again that shakes in frequency range, it is ensured that sensor can work normally same
When, the measurement frequency can simultaneously be increased by having saved system power dissipation.
Fig. 3 and Fig. 4 sets forth the current drain sequence diagram under both of which, wherein excitation pulsewidth t1 values of shaking in advance are
100-200ms, excitation pulsewidth t2 values of shaking again are 200-500ms, and sampling processing of shaking in advance and sampling processing stage of shaking again are also because of AD
The consumption portion of energy such as conversion, standby phase shake and then energy consumption minimizes the stage of shaking again compared to pre-, wherein standby duration by
The temporal resolution of measurement sensor determines, is usually second level.
The present invention greatlys save energy consumption compared to low pressure scanning frequency excitation mode, meets sensor in unattended, battery
The requirement that works long hours under condition of power supply.
Claims (4)
1. a kind of excitation detection method of low-power consumption vibration wire sensor, the low-power consumption vibration wire sensor includes vibratory string, coil
And sensor housing, the vibratory string are fixed on the both ends of sensor housing, coil is arranged on the middle part of vibratory string, and vibratory string is produced
Encourage and detect the vibration of vibratory string, which further includes exciting circuit unit, pick-up circuit unit and master control
Unit；
The exciting circuit unit provides electric signal by coil for vibratory string starting of oscillation；
The pick-up circuit unit obtains the frequency signal of vibratory string by coil；
The main control unit includes pre- module of shaking, shake module, frequency detection module and signal processing module again, the excitation electricity
The output terminal of road unit is electrically connected with the input terminal for module of shaking in advance, the input terminal for module of shaking again, the pick-up circuit unit it is defeated
The input terminal of outlet and frequency detection module electrically connects, output terminal, module of shaking again output terminal and the frequency inspection of the pre- module of shaking
The output terminal for surveying module is electrically connected with signal processing module respectively；
The signal processing module record effectively answers vibration frequency signal, while controls the excitation testing process of sensor, makes
Sensor works under stable state and unstable state both of which, and effectively answers resonance frequency value according to record, is calculated next time
The driving frequency value of module of shaking again during steady state operating mode output；
The unstable state operating mode according to shaking in advance-pre- detection of shaking-shakes-detecting step that shakes again progress again；The stable state
Operating mode is according to-the detecting step that shakes again progress of directly shaking again；
It is characterised in that it includes following steps：
[1] after sensor installation and debugging, during preceding n detection, signal processing module controls sensor according to shaking-shake in advance in advance
Detect-shake again-unstable state the pattern of detection of shaking again work, wherein the pumping signal shaken in advance is the pulse telecommunications of pulsewidth t1
Number, the frequency for detection of shaking in advance is Fi, the pumping signal shaken again is frequency of oscillation Fi, pulsewidth t2 electric signal, shake detection frequency f againi
It is this measurement as a result, wherein n and i are positive integer, i is measurement the time；
[2] i is worked as>During n, sensor according to directly shake again-equilibrium mode of detection of shaking again works, wherein pumping signal of shaking again
Pulsewidth is t2, driving frequency FiMeasured according to first n times and obtain the moving average access of frequency values：Fi=(fi-n+……+fi-2+
fi-1)/n, and the frequency measurement for obtaining this time is fi；
[3] if detecting the working range that obtained multiple vibration frequency exceeds sensor in step [2], or the signal value that shakes again is weak extremely
It is difficult to normally detect, then this time measurement is invalid, and sensor according to shaking in advance-detection of shaking in advance-to shake again-the unstable state of detection of shaking again
Pattern works, otherwise sensor according to directly shake again-equilibrium mode of detection of shaking again works；
[4] every time after measurement, the frequency values f of this time is recordediCalculating for Subsequent activations signal frequency.
2. the excitation detection method of low-power consumption vibration wire sensor according to claim 1, it is characterised in that：It is described pre- to shake
The excitation pulsewidth t1 and excitation pulsewidth t2 that shakes again, obtains according to the calibration experiment to sensor.
3. the excitation detection method of low-power consumption vibration wire sensor according to claim 1, it is characterised in that：N=10,20 or
50。
4. the excitation detection method of low-power consumption vibration wire sensor according to claim 1, it is characterised in that：It is described pre- to shake
It is 100-200ms to encourage pulsewidth t1, and the excitation pulsewidth t2 that shakes again is 200-500ms.
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| CH713460A2 (en) * | 2017-02-15 | 2018-08-15 | Digi Sens Ag | Swing string sensor and swinging string for a swinging string sensor. |
| CN106840246A (en) * | 2017-04-06 | 2017-06-13 | 中国电建集团中南勘测设计研究院有限公司 | A kind of vibrating string type sensor work condition on-line testing method and device |
| CN108051074B (en) * | 2017-12-07 | 2019-10-18 | 浙江大学 | A kind of frequency measurement method of vibrating string type sensor |
| CN109799010A (en) * | 2019-03-21 | 2019-05-24 | 京东方科技集团股份有限公司 | A kind of pressure-detecting device and method |
| CN110702150A (en) * | 2019-10-11 | 2020-01-17 | 贵州省质安交通工程监控检测中心有限责任公司 | Optimized sweep frequency excitation method for vibrating wire collector |
| CN112986391B (en) * | 2021-02-26 | 2023-05-26 | 北京龙鼎源科技股份有限公司 | Method and device for determining excitation frequency |
| CN113790954A (en) * | 2021-08-20 | 2021-12-14 | 河北光兴半导体技术有限公司 | Thin glass elastic modulus testing method and device |
| 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 |
| CN114838680A (en) * | 2022-07-01 | 2022-08-02 | 中山大学 | Real-time monitoring system and method for riverbed scouring depth |
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| RU2087877C1 (en) * | 1992-07-30 | 1997-08-20 | Анатолий Гиршевич Левелев | Method measuring oscillation frequency of vibrating wire transducer |
| CN2854543Y (en) * | 2005-07-25 | 2007-01-03 | 王风 | Exiting structure of vibration string sensor |
| CN101571407B (en) * | 2009-06-19 | 2010-11-10 | 中国水利水电科学研究院 | Excitation method of vibrating wire sensor |
| CN102288279A (en) * | 2011-06-15 | 2011-12-21 | 基康仪器(北京)有限公司 | Excitation method and device of vibration string type instrument |
| CN203053474U (en) * | 2012-11-23 | 2013-07-10 | 国网电力科学研究院 | Vibrating wire sensor adapter compatible with SDI-12 protocol |
| CN103968973B (en) * | 2014-05-23 | 2017-01-11 | 重庆建工第三建设有限责任公司 | Shock excitation method for vibrating wire sensor |
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