CN105628173B - Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor - Google Patents
Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor Download PDFInfo
- Publication number
- CN105628173B CN105628173B CN201511015676.9A CN201511015676A CN105628173B CN 105628173 B CN105628173 B CN 105628173B CN 201511015676 A CN201511015676 A CN 201511015676A CN 105628173 B CN105628173 B CN 105628173B
- Authority
- CN
- China
- Prior art keywords
- signal
- optical
- vibration
- module
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
Abstract
A kind of Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor, including optical fibre grating acceleration sensor group, 1 × N fiber couplers, circulator, M preposition wavelength division multiplexers, postposition wavelength division multiplexer, wideband light source, opto-electronic conversion filter module, non-equilibrium Michelson fiber-optic interferometer demodulation module, field programmable gate array module, power conditioner case, microprocessor industrial control mainboard modules.Wherein optical fibre grating acceleration sensor is used to be mounted in head cover or the rack of Hydropower Unit, optical signal transmission is carried out by the armored optical cable connection of the fixed differential length of setting, then optical signal interferometry is demodulated.The device is applied has high sensitivity in Hydropower Unit vibration measurement, sensing and detection part are completely insulated, the advantages that low noise, low-frequency response, the device can detect the vibration signal down to 0.1Hz, to meet the monitoring function of Hydropower Unit low-frequency vibration signal 0.4Hz 200Hz Hz-KHzs, and the longtime running stability for improving existing low-frequency shock transducer is poor, precision reduce the problems such as.
Description
Technical field
The present invention relates to a kind of Hydropower Plant detection device, especially a kind of Hydropower Plant based on Fibre Optical Sensor is shaken
It is dynamic to measure monitoring device.
Background technology
Hydrogenerator accident shows as vibration fault more.Vibration signal is with multi-dimensional nature, popularity and with general
Practicability, thus water turbine set monitoring system regard vibration as main monitoring project.Wherein turn of large and medium hydro-generator group
Frequently relatively low, about 1~2Hz, turbine draft tube generate flow be vortexed caused by unit vibration it is lower, about turn frequency 1/5~
1/3, once in addition, emergency load dump occurs in the process of running for Hydropower Unit, the frequency of vibration signal in Transients of Load Rejection
Rate will be lower.
The sensor of currently used Hydropower Unit vibration monitoring is using the DP low frequencies based on seismic wave detection improvement
Sensor, monitoring vibration frequency range are 0.5Hz-200Hz, can be with output speed or displacement signal, specific implementation method ginseng
Patent CN92102774- " earthquake type low-frequency vibration measuring device " is examined, but there are the mistakes of a large amount of signals in the device onsite application
Effect, the problems such as stability is poor, while being also possible to cause to resonate, cause to measure inaccurate.
Another way be use piezoelectric accelerometer or servo type accelerometer, then again by integrating circuit into
Row low-frequency vibration monitors, such as patent CN201410561597- " Hydropower Plant vibration measurement monitoring method ".The device is due to making
It is the sensor of electronic type, needs to overcome sensor that the influence powered, remote transmission electromagnetic interference, even signal is needed to decline
The problems such as subtracting, and which is to carry out conversion of the acceleration to speed or displacement signal using the hardware integral of analog signal.
In addition, patent ZL201320620060.4- " a kind of transformer optical fiber raster vibration wave spectrum on-line monitoring system " is related to
And vibration signal demodulating process is carried out using non-equilibrium Michelson fiber-optic interferometer, it is characterized in that the different wave length inside single channel
The cascaded structure of sensor, and the vibration signal high frequency signal of transformer is obtained, Hz-KHz is not related in 10Hz-1KHz
And the real-time parallel processing and the acquisition of vibration velocity signal and vibration displacement signal of low frequency signal.
A kind of heterodyne laser interference angle vibration measurement method and device that patent 201310253212.6 is realized, feature
Low signal-to-noise ratio, non-stationary angular oscillation through laser Doppler signal waveform are carried out less than the mold segment of a carrier cycle in its use
Digitization frequencies demodulate, and then obtain angular oscillation velocity wave form and angular oscillation Acceleration pulse.But it does not refer to that low frequency is believed
Number, especially down to the signal measurement of 0.1Hz and the Simultaneous Monitoring of multichannel.
But no matter current Hydropower Unit is monitored using conventional low-frequency vibration, is required for being powered sensor,
It even needs to carry out the processing of circuit that signal relaying amplifies in signals transmission, due to Hydropower Unit sensor installation environment
, around there is forceful electric power magnetic environment in inclement condition, therefore measured in current practice there are the low-frequency shock transducer service life is too short
Precision tends to decrease, and causes to measure and fail.
Invention content
The purpose of the present invention is provide a kind of measurement for the deficiency in current Hydropower Unit vibration monitoring practice
Data are reliable, accuracy is high, the effective Hydropower Plant vibration measurement device based on Fibre Optical Sensor.The device is by light
Fine grating acceleration transducer group and interferometry demodulating equipment two parts collectively constitute.It partly belongs to nothing with front end sensors
Source sensor avoids electromagnetic interference without power supply；Rear end part uses interferometry into the demodulation process of traveling optical signal, and uses
High-precision field programmable gate array module carries out multichannel synchronousing collection and parallel processing, utilizes stopping direct current filtering and phase
Influence of the carrier wave algorithm reduction integrating circuit dc shift to signal, present apparatus minimum measurable 0.1Hz low-frequency vibration signals, because
And realize the high-acruracy survey for Hydropower Unit low-frequency vibration signal between 0.4Hz-200Hz.
The technology used in the present invention measure is：A kind of Hydropower Plant vibration measurement monitoring dress based on Fibre Optical Sensor
It sets, it includes sequentially connected optical fibre grating acceleration sensor group, M preposition wavelength division multiplexers, 1 × N fiber couplers, rings
Shape device, wideband light source；It is characterized in that circulator is also connect with non-equilibrium Michelson steller interferometer demodulation module, non-equilibrium Michelson is dry
Interferometer demodulation module connect with postposition wavelength division multiplexer, after postposition wavelength division multiplexer connection photoelectricity filtering conversion module, then with it is existing
Field programmable gate array module connects；Power conditioner case is non-equilibrium Michelson steller interferometer demodulation module, photoelectricity filtering modulus of conversion
Block, wideband light source, field programmable gate array module and microprocessor industrial control mainboard module for power supply.
In addition, working as M=N and N ≠ 0, N≤25, the light that wideband light source is sent out is entered the specific feature of this programme by circulator
1 × N fiber couplers realize that the roads N optical signal exports, and every 1 tunnel connects 1 preposition wavelength division multiplexer in the roads N, amounts to M；Optical fiber light
Grid acceleration transducer group is directly connected to M preposition wavelength division multiplexers：1 channel connection 1 in each preposition wavelength division multiplexer
A optical fibre grating acceleration sensor, can 1 to 8 different wave length in parallel optical fibre grating acceleration sensor, and only with it is rear
1 channel set in wavelength division multiplexer corresponds to；Then M preposition wavelength division multiplexers are connect with 1 × N fiber couplers again.
As M=0 and N ≠ 0, N≤25, optical fibre grating acceleration sensor group are that the fiber grating of N number of different wave length accelerates
Spend sensor parallel structure；Every 1 optical fibre grating acceleration sensor is connect with 1 tunnel of 1 × N fiber couplers, wherein every 1 tunnel
Optical fibre grating acceleration sensor uniquely corresponds to 1 channel of postposition wavelength division multiplexer.
The wave-length coverage of optical fibre grating acceleration sensor is i.e. 1525nm-1610nm in C+L wave bands；Then every 1 road light
Fine grating acceleration transducer with vibration acceleration signal feature reflected light signal again by 1 × N fiber couplers after, warp
Circulator send every 1 road reflected light signal to non-equilibrium Michelson steller interferometer demodulation module；By with the non-flat of carrier modulation
The Michelson steller interferometer demodulation module that weighs generates interference to every 1 road reflected light signal, to carry the reflection of vibration signal characteristics
Optical signal is converted to the interference light signal with phase property；It is multiple that interference light signal enters back into the corresponding postposition wavelength-division of unique wavelength
Wavelength separated is carried out with unique passage in device, the optical signal after separation has vibration phase feature, wavelength unique features, time difference
Other feature；Enter opto-electronic conversion filter module by every 1 road optical signal of postposition wavelength division multiplexer, convert optical signals into often
The corresponding voltage signal of 1 road optical fibre grating acceleration sensor；
Then every 1 road voltage signal carries out multichannel synchronousing collection by field programmable gate array module, and uses the time-division
Multiplexing algorithm, parallel multi-channel phase detection algorithm calculate, and finally processing obtains vibration acceleration digital signal；Vibration acceleration
Digital signal is re-fed into microprocessor processes and obtains vibration velocity signal, further obtains vibration displacement signal.
The optical fiber raster vibration acceleration transducer includes：One bearing, bearing are u font structures, have the first side wall
And second sidewall, the inside of the first side wall have first step；The crossbeam that the oriented the first side wall in second sidewall top extends, the
It is provided with second step and third step on the outside of two side walls, adjusting beam is provided on second step, it is solid on third step
Surely it is provided with compensation column；Vertical slots are provided in second sidewall；Inverted T shaped elastic piece, the head of elastic piece are provided on bearing
It is fixed on the first step on the inside of the first side wall, the tail portion of elastic piece is fixedly connected with improve quality block and lower mass block, improves quality
Block and lower mass block are symmetrically arranged on elastic piece both sides up and down；Be provided in the middle part of elastic piece one it is upward turn up piece, turning up
On piece is provided with the first micropore；It includes riser and transverse slat to adjust beam, and bottom of the riser is provided with flange, is provided on second step
Guide groove, flange is adapted with guide groove makes adjusting beam flange be pivoted in guide groove；It is micro- it to be provided with second at the top of the riser of adjusting beam
Hole, the riser for adjusting beam are connected by the second sidewall of the first trip bolt and bearing, adjust and be arranged between beam and second sidewall
There are the first elastomeric pad, the first trip bolt that the first elastomeric pad is made to generate deformation；The transverse slat for adjusting beam passes through the second fastening spiral shell
Nail is connect with compensation column, and the second elastomeric pad, the second trip bolt are housed between the second trip bolt and the transverse slat for adjusting beam
It is screwed into the threaded hole on compensation column across the second elastomeric pad and transverse slat；Fiber grating sequentially passes through the first micropore, vertically
Slot and the second micropore, and at the first micropore with turn up piece and be fixed together, at the second micropore with adjust beam and be fixed together.
The optical fiber raster vibration acceleration transducer is after above structure encapsulates outside both ends are there are 50 centimetres of optical cables
Then wiring is directly installed on head cover and rack；And optical cable connection is connect with armouring by a flange, armouring connects optical cable
The other end is connected to back-end device.
Optical fiber raster vibration acceleration transducer used is encapsulated using prestressing force stretching optical fiber grating, and in grating region
Domain carries out polyimide coating.
The optical fiber raster vibration acceleration transducer group, when there are tandem junctions between optical fibre grating acceleration sensor
When structure, it is characterized in that the sensor of the same wavelength should use the armouring of the fixed differential length of setting to connect optical cable, i.e., in 1 × N
When fiber coupler realizes the optical signal output of the roads N, the connection optical cable between the roads N and the roads N-1 differs the length of 50m,
Armouring connection optical cable between the roads N+1 and the roads N-1 differs the length of 2 × 50m, and so on.
Wavelength sensitivity >=140pm/g of optical fiber raster vibration acceleration transducer, sensitivity measure curve such as Fig. 3 institute
Show；Present apparatus monitoring frequency response range can be in 0.1Hz-300Hz, and sensor resonant frequency is in 200Hz or more.Sensor
Sensitivity is almost the same within 200Hz, and fluctuation is very small；The vibration signal obtained for sensor is passing through non-equilibrium mikey
After your inferior interferometer demodulation module, field programmable gate array module, microprocessor industrial control mainboard resume module, obtained by device
Width frequency response curve is to meet the measurement request between Hydropower Unit low-frequency vibration 0.4Hz-200Hz shown in Fig. 4.
Include inside non-equilibrium Michelson steller interferometer demodulation module of the present invention 1 non-equilibrium Michelson fiber-optic interferometer and
1 piece of carrier modulation circuit module；Wherein non-equilibrium Michelson steller interferometer is less than or equal to the encapsulating structure of 5mm using arm length difference, such as
The interferometer of Optiphase companies of the U.S..Carrier modulation circuit module uses embedded-type ARM chip（Acorn RISC
Machine）Internal digital analog converter exports constant sine wave signal composition, such as uses the STM32 chips of STMicw Electronics.
The wideband light source that the present invention uses is C+L wave band flat wideband light sources（1525nm-1610nm）, power be 50mw extremely
100mw, light source flatness are that, for providing transmitting light source to fiber-optic grating sensor group, Shenzhen may be used not higher than 1.5dB
The wideband light source of Hao Yuan photoelectricity company or Tianjin Jun Feng photoelectricity company.
Power conditioner case used in the present invention is formed using high-fidelity music center level power supply cleaning module and linear power supply, for handing over
Galvanic electricity source or mains supply adjust and purification, can continue to provide low ripple, purer power supply, city preferably may be used
Shenzhen Qianrong on field contains the F1000 power purifications module and southern exposure linear power supply of company.
The opto-electronic conversion filter module of the present invention uses high-accuracy, low distortion operational amplifier A D8067, and unit background
Noise is less than 1mV, for carrying out opto-electronic conversion to faint optical signal and carrying out bandpass filtering treatment.
Designing based on SBRIO core boards for NI instruments may be used in field programmable gate array module of the present invention
Module is directed to the noise signal of low frequency signal and influences to reduce, and 24 acquisition precisions that acquisition channel uses, sample frequency is big
In 100K, and for Same Wavelength in same channel then internal logic circuit hardware realization is passed through using time division multiplexing algorithm
Vibration acceleration digital signal of the multichannel phase detection algorithm then by hardware algorithm demodulation is transmitted to microprocessor industrial control mainboard
Module.
The present invention is as shown in Figure 1, in order to reach the low frequency signal vibration monitoring function to Hydropower Unit, the feature of the device
For two demodulation parts：（1）Light path demodulating process：Being demodulated for vibration signal for device, needs first by being mounted on Hydropower Unit
Hydropower Unit vibration signal is converted to every 1 road optical fibre grating acceleration by head cover, rack optical fiber raster vibration acceleration transducer
The reflected light signal of sensor, then every 1 road reflected light signal formed in non-equilibrium Michelson steller interferometer module stablize, low noise
Interference light signal, then the interference light signal of every 1 road different wave length is separated by postposition wavelength division multiplexer, enters back into light
Interference light signal is transformed into analog voltage signal by electrofiltration wave conversion module.（2）Demodulating process：As shown in Figure 1 and Figure 5, in light
Electrofiltration wave conversion module have passed through the multi-channel analog voltage signal exported after opto-electronic conversion and stopping direct current filtering link, pass through scene
The multichannel synchronousing collection of programmable gate array module calculates, and is calculated using time division multiplexing for Same Wavelength in same channel
Method, while analog voltage signal is transformed into vibration acceleration by hardware realization multichannel phase detection algorithm, down-sampled calculating method
Digital signal is sent into microprocessor industrial control mainboard module using multichannel high-pass filtering link；By microprocessor industry control master
Plate module realizes that the first multichannel stopping direct current filtering link, the first multichannel integral element obtain vibration velocity signal；It can also
It is further continued for obtaining vibration displacement signal by least one the second multichannel stopping direct current filtering link, the second multichannel integral element,
To meet the monitoring function of Hydropower Unit vibration signal 0.4Hz-200Hz Hz-KHzs.Wherein, the field-programmable gate array
Vibration acceleration signal, vibration velocity signal, vibration displacement signal and its acquisition and calculating after the acquisition of row module, demodulating algorithm
Link is handled using digital signal, the attenuation problem of no analog signal.
The beneficial effects of the present invention are：
1, optical fibre grating acceleration sensor belongs to passive remote recording monitoring sensor, and optical fiber has strong insulating properties,
Not by electromagnetic interference, and the DP sensors of other types of such as seismic detection formula, piezoelectric transducer active type sensor hold
Easily there is unstable phenomenon, cause the frequency signal measured is gradually tight very or even after long-play can not detect low frequency signal,
Lose effective information；Thus optical fibre grating acceleration sensor power supply, transmission signal will not decay, measuring signal without amplification
Etc. exist more easily use advantage, longer to reach Long Service Life, measurement accuracy is kept accurately for a long time
Situation.
2, the multi-channel fiber Bragg grating acceleration group light channel structure design that the present apparatus uses, compared to other types on the market
Sensor, number of channels can be mostly very much, when needing real-time synchronization to monitor the big quantity sensor of multiple Hydropower Units, using this
The multi-channel testing device of invention design can be realized more easily, so as to reduce power plant cost.
3, vibration signal demodulation method is carried out using non-equilibrium Michelson's interferometry of light path, there is highly sensitive, high-resolution
Advantage in the measuring principles such as rate, Larger Dynamic range, relatively other kinds of vibration signal parsing, this method measure low-limit frequency
It is even lower 0.1Hz can be reached；The low frequency that can be very good parsing 0.2Hz in the obtained device actual test of the present invention shakes
Dynamic signal, thus can preferably restore indeed vibrations meeting in Hydropower Unit low-frequency vibration monitoring range 0.4Hz-200Hz
Signal.
Description of the drawings
Fig. 1 is optical fiber Hydropower Plant vibration measurement device hardware block diagram；Fig. 2 is optical fibre grating acceleration sensor
Structural schematic diagram；Fig. 3 is the sensitivity measure curve of multiple sensors；Fig. 4 is optical fibre grating acceleration sensor amplitude versus frequency characte
Curve；Fig. 5 is device signal demodulation overall flow figure.
In Fig. 2：10- bearings；11- the first side walls；12- second sidewalls；13- first steps；14- crossbeams；15- second
Rank；16- third steps；17- guide grooves；18- vertical slots；20- elastic pieces；21- turns up piece；The first micropores of 22-；23- conditioning boxes；
30- improves quality block；Mass block under 31-；The first elongated slots of 32-；40- adjusts beam；The first trip bolts of 41-；The first cushions of 42-
Piece；The second elastomeric pads of 43-；The second trip bolts of 44-；The second micropores of 45-；46- flanges；50- compensates column；60- fiber gratings；
70- stop screws；71- third elastomeric pads.
Specific implementation mode
To realize the present invention, be below a preferred embodiment, may be implemented the present invention, but the present invention be not limited only to it is following
Embodiment.
As shown in Figure 1, the Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor, it includes sequentially connected light
Fine grating acceleration transducer group, M preposition wavelength division multiplexers（The present embodiment uses M=0）, 1 × N fiber couplers, annular
Device, wideband light source（The present embodiment uses C-band）；Circulator is also connect with non-equilibrium Michelson steller interferometer demodulation module,
Non-equilibrium Michelson steller interferometer demodulation module is connect with postposition wavelength division multiplexer, the connection photoelectricity filtering of postposition wavelength division multiplexer is converted
After module, then it connect with field programmable gate array module；Power conditioner case is non-equilibrium Michelson steller interferometer demodulation module, light
Electrofiltration wave conversion module, wideband light source, field programmable gate array module and microprocessor industrial control mainboard module for power supply.
In order to reach the purpose of the present invention, the optical fiber raster vibration acceleration transducer in the present invention, as shown in Fig. 2,
It includes：One bearing 10, bearing 10 are u font structures, have the first side wall 11 and second sidewall 12, the inside of the first side wall 11
With first step 13；The crossbeam 14 that the oriented the first side wall 11 in 12 top of second sidewall extends, sets in the outside of second sidewall 12
It is equipped with second step 15 and third step 16, is provided on second step 15 and adjusts beam 40, it is fixed on third step 16 to set
It is equipped with compensation column 50；Vertical slots 18 are provided in second sidewall 12；Inverted T shaped elastic piece 20, elastic piece are provided on bearing 10
20 head is fixed on the first step 13 of 11 inside of the first side wall, and the tail portion of elastic piece 20 is fixedly connected with 30 He of block of improving quality
Lower mass block 31, improves quality block 30 and lower mass block 31 is symmetrically arranged on about 20 both sides of elastic piece；The middle part of elastic piece 20 is set
Be equipped with one it is upward turn up piece 21, the first micropore 22 is provided on turning up piece 21；It includes riser and transverse slat, riser to adjust beam 40
Bottom is provided with flange 46, guide groove 17 is provided on second step 15, flange 46 is adapted with guide groove 17 makes adjusting beam 40
Flange 46 pivots in guide groove 17；It adjusts and is provided with the second micropore 45 at the top of the riser of beam 40, adjust the riser of beam 40 by the
One trip bolt 41 is connect with the second sidewall 12 of bearing 10, is adjusted and is provided with the first cushion between beam 40 and second sidewall 12
Piece 42, the first trip bolt 41 make the first elastomeric pad 42 generate deformation；The transverse slat for adjusting beam 40 passes through the second trip bolt 44
It is connect with compensation column 50, and the second elastomeric pad 43 is housed between second trip bolt 44 and the transverse slat for adjusting beam 40, second is tight
Gu screw 44 passes through the second elastomeric pad 43 and transverse slat to be screwed into the threaded hole on compensation column 50；Fiber grating 60 sequentially passes through
First micropore 22, vertical slots 18 and the second micropore 45, and at the first micropore 22 with turn up piece 21 and be fixed together, it is micro- second
It is fixed together with adjusting beam 40 at hole 45.
The optical fiber raster vibration acceleration transducer is after above structure encapsulates outside both ends are there are 50 centimetres of optical cables
Then wiring is directly installed on head cover and rack；And optical cable connection is connect with armouring by a flange, armouring connects optical cable
The other end is connected to back-end device.
The sensor of the same wavelength is using the fixed differential length of setting in optical fiber raster vibration acceleration transducer group
Armouring connects optical cable, is required in rack or head cover according to different Hydropower Units, and wherein sensor wavelength is in C-band
Wavelength between 1525nm-1565nm, each sensor connect optical cable and remote control cabinet from installation point by single armouring
Demodulation instrument is connected, and the response characteristic of wherein sensor is as shown in Figure 3.
As shown in Figure 1, the light sent out using the wideband light source of C-band is realized by circulator into 1 × N fiber couplers
The optical signal output of the roads N, enables M=0, meets N≤25, and optical fibre grating acceleration sensor group is N number of optical fibre grating acceleration sensor
Parallel-connection structure, every 1 tunnel is directly transferred to 1 optical fibre grating acceleration sensor in the optical signal of the roads N；Then every 1 road fiber grating
Acceleration transducer with vibration acceleration signal feature reflected light signal again by 1 × N fiber couplers after, through circulator
Every 1 road reflected light signal is sent to non-equilibrium Michelson steller interferometer demodulation module；Pass through the non-equilibrium mikey with carrier modulation
Inferior interferometer demodulation module generates interference to every 1 road reflected light signal, and it is corresponding that the optical signal after interference enters back into unique wavelength
Unique passage carries out wavelength separated in postposition wavelength division multiplexer, and the interference light signal after separation has vibration phase feature, wavelength
Unique features, time distinction；Enter opto-electronic conversion filter module by every 1 road optical signal of postposition wavelength division multiplexer, it will
Optical signal is converted into corresponding every 1 road voltage signal.
Then every 1 road voltage signal carries out multichannel synchronousing collection by field programmable gate array module, and uses the time-division
Multiplexing algorithm, parallel multi-channel phase detection algorithm calculate, and finally processing obtains vibration acceleration digital signal；Vibration acceleration
Digital signal is re-fed into microprocessor industrial control mainboard module, handles to obtain vibration velocity signal by software, further obtain
Vibration displacement signal.
Include 1 non-equilibrium Michelson fiber-optic interferometer and 1 piece of carrier wave tune inside non-equilibrium Michelson steller interferometer demodulation module
Circuit module processed.The interferometer of Optiphase companies of the U.S., Beijing semiconductor may be used in wherein non-equilibrium Michelson steller interferometer
Or China Electronics 23 packaged by non-equilibrium Michelson steller interferometer, arm length difference be less than or equal to 5mm.Carrier modulation circuit mould
Block uses embedded-type ARM chip（Acorn RISC Machine）Internal digital analog converter exports constant sine wave signal group
At such as using the STM32 chips of STMicw Electronics.
Reflected light signal enters the non-equilibrium Michelson fiber-optic interferometer module for implementing the modulation of 2.5KHz carrier modulation blocks, leads to
It crosses the light channel structure of arm length difference 5mm and faraday rotation mirror eliminates polarization effect later by the vibration signal spy in reflected light signal
Sign is converted to the interference light signal with phase property.Then wavelength-division multiplex is carried out to interference light signal, by as shown in Figure 1
Photoelectricity filters the effective voltage signal that optical signal conversion is enlarged into positive and negative 10V by conversion module and exports.
The unit module based on chip AD8067 that opto-electronic conversion filter module may be used, up to 16 channels design,
Background noise is less than 1mV, and optical signal detecting intensity need to be at nW grades.
Field programmable gate array module can select the existing core board in market to carry out the design configurations of peripheral circuit again,
Such as the SBRIO core boards of NI instruments.Since signal frequency is low, while in order to eliminate the dual noise of light path and circuit, needing
Using 24 peripheral acquisition chips, frequency acquisition needs to be higher than 100KHz, and parallel processing is carried out to 16 road low-frequency vibration signals.
Field programmable gate array module is write the time-division using LABVIEW when being handled for same channel Same Wavelength and is calculated
Method treats the optical fibre grating acceleration vibrating sensor of Same Wavelength with a certain discrimination；Interference signal phase detection algorithm preferably uses
It is the multiplication of phase carrier differential or the point-by-point operation of arc tangent algorithm Real-time hardware, Real-time demodulation interference signal.
The technical grade embedded main board that dominant frequency is high, memory is big may be used in microprocessor industrial control mainboard module, and such as tide is ground
China etc., preferable mainboard have embedded 5271 mainboard for grinding China.Vibration acceleration is transmitted by field programmable gate array module
Digital signal needs to carry out step-by-step processing to acceleration signal in real time, as shown in Figure 4 to microprocessor industrial control mainboard.Best
Mode first can carry out the processing of the first multichannel stopping direct current filtering signal to acceleration signal, carry out multistage having the punching of limit for length's unit
Swash response filter denoising design, fitting of a polynomial integral algorithm then may be used and carry out the first time-domain integration calculating, in this way
Vibration velocity signal is can be obtained by, and the direct current in digit phase carrier wave algorithm demodulating process can be inhibited to float to a certain degree
Move phenomenon.Vibration displacement signal is obtained if necessary, can be repeated the above process, and as described in Figure 1, carries out the second multichannel blocking
Filter design is flowed, then carries out the second time-domain integration operation, can be obtained by required vibration displacement signal in this way.
It is handled eventually by the allied signal of sensor and demodulating system modules, realizes that the amplitude versus frequency characte of sensor is bent
Line is as shown in figure 3, whole device can detect effective low frequency signal down to 0.1Hz, for practical Hydropower Unit low frequency
Vibration monitoring application, the vibration useful signal for meeting low frequency 0.4Hz measure.
High-fidelity music center level power supply cleaning module may be used in power conditioner case and linear power supply is composed, and provides pure
And steady dc voltage, F1000 power purifications module and court that Shenzhen Qianrong in the market contains company preferably may be used
Positive linear power supply.
Optical fiber raster vibration monitoring device based on the demodulation of non-equilibrium Michelson fiber-optic interferometer can meet Hydropower Plant
Vibration signal detects, due to using the optical fibre grating acceleration sensor based on Fibre Optical Sensor, in sensor front end installation place and
Signal almost insulate between being transmitted to the demodulation instrument that power distribution cabinet is installed from front end, avoids the remote transmission of electric signal
Loss, noise jamming even need to carry out the influence factors such as signal enhanced processing.Further, since the resonance band of sensor exists
200Hz or more, so the intermediate frequency vibration signal with Hydropower Unit not will produce resonance substantially.Therefore, the present invention solves original
Inertia low-frequency shock transducer measuring signal be distorted or failure, low precision the problems such as, while invented a kind of new stability it is good,
Long lifespan, the high grating sensing monitoring device of the reliability of measurement data, accuracy, in power station, vibration online monitoring, measurement will have
Good promotion prospect.
Claims (8)
1. a kind of Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor, it includes that sequentially connected fiber grating adds
Velocity sensor group, M preposition wavelength division multiplexers, 1 × N fiber couplers, circulator, wideband light sources；It is characterized in that circulator
It is also connect with non-equilibrium Michelson steller interferometer demodulation module, non-equilibrium Michelson steller interferometer demodulation module and postposition wavelength division multiplexer
It connects, after postposition wavelength division multiplexer connection photoelectricity filtering conversion module, then connect with field programmable gate array module；Purifying electric
Source case is non-equilibrium Michelson steller interferometer demodulation module, photoelectricity filtering conversion module, wideband light source, field programmable gate array mould
Block and microprocessor industrial control mainboard module for power supply；
The optical fiber raster vibration acceleration transducer includes：One bearing, bearing are u font structures, have the first side wall and the
The inside of two side walls, the first side wall has first step；The crossbeam that the oriented the first side wall in second sidewall top extends, in the second side
It is provided with second step and third step on the outside of wall, adjusting beam is provided on second step, it is fixed on third step to set
It is equipped with compensation column；Vertical slots are provided in second sidewall；Inverted T shaped elastic piece is provided on bearing, the head of elastic piece is fixed
On the first step on the inside of the first side wall, the tail portion of elastic piece is fixedly connected with improve quality block and lower mass block, improve quality block and
Lower mass block is symmetrically arranged on elastic piece both sides up and down；Be provided in the middle part of elastic piece one it is upward turn up piece, turning up on piece
It is provided with the first micropore；It includes riser and transverse slat to adjust beam, and bottom of the riser is provided with flange, is provided with and leads on second step
Slot, flange is adapted with guide groove makes adjusting beam flange be pivoted in guide groove；It adjusts and is provided with the second micropore at the top of the riser of beam,
The riser for adjusting beam is connected by the second sidewall of the first trip bolt and bearing, is adjusted and is provided with the between beam and second sidewall
One elastomeric pad, the first trip bolt make the first elastomeric pad generate deformation；Adjust beam transverse slat by the second trip bolt with
Column connection is compensated, and the second elastomeric pad is housed between the second trip bolt and the transverse slat for adjusting beam, the second trip bolt passes through
Second elastomeric pad and transverse slat are screwed into the threaded hole on compensation column；Fiber grating sequentially passes through the first micropore, vertical slots and
Second micropore, and at the first micropore with turn up piece and be fixed together, at the second micropore with adjust beam and be fixed together.
2. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that working as M
=N and N ≠ 0, N≤25, the light that wideband light source is sent out enter 1 × N fiber couplers by circulator and realize that the roads N optical signal exports,
Every 1 tunnel connects 1 preposition wavelength division multiplexer in the roads N, amounts to M；Optical fibre grating acceleration sensor group is directly connected to M prewave
Division multiplexer：1 channel in i.e. each preposition wavelength division multiplexer connects 1 optical fibre grating acceleration sensor, can parallel connection 1
It is corresponding with 1 channel in postposition wavelength division multiplexer to the optical fibre grating acceleration sensor of 8 different wave lengths, and only；Then M
A preposition wavelength division multiplexer is connect with 1 × N fiber couplers again.
3. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that working as M
When=0 and N ≠ 0, N≤25, optical fibre grating acceleration sensor group be N number of different wave length optical fibre grating acceleration sensor simultaneously
It is coupled structure, every 1 optical fibre grating acceleration sensor is connect with 1 tunnel of 1 × N fiber couplers, wherein every 1 road fiber grating adds
Velocity sensor uniquely corresponds to 1 channel of postposition wavelength division multiplexer.
4. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that light
The wave-length coverage of fine grating acceleration transducer is i.e. 1525nm-1610nm in C+L wave bands；Then every 1 road fiber grating accelerates
Spend sensor with vibration acceleration signal feature reflected light signal again by 1 × N fiber couplers after, will be every through circulator
1 road reflected light signal is sent to non-equilibrium Michelson steller interferometer demodulation module；It is dry by the non-equilibrium Michelson with carrier modulation
Interferometer demodulation module generates interference to every 1 road reflected light signal, and the reflected light signal to carry vibration signal characteristics is converted
For the interference light signal with phase property；Interference light signal enters back into unique in the corresponding postposition wavelength division multiplexer of unique wavelength
Channel carries out wavelength separated, and the optical signal after separation has vibration phase feature, wavelength unique features, time distinction；It is logical
Later the every 1 road optical signal for setting wavelength division multiplexer enters opto-electronic conversion filter module, converts optical signals into and every 1 road optical fiber light
The corresponding voltage signal of grid acceleration transducer；
Then every 1 road voltage signal carries out multichannel synchronousing collection by field programmable gate array module, and using time division multiplexing
Algorithm, parallel multi-channel phase detection algorithm calculate, and finally processing obtains vibration acceleration digital signal；Vibration acceleration number
Signal is re-fed into microprocessor processes and obtains vibration velocity signal, further obtains vibration displacement signal.
5. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that institute
It is encapsulated using prestressing force stretching optical fiber grating with optical fiber grating vibration acceleration sensor, and polyamides is carried out in grating region
Imines coats；The optical fiber raster vibration acceleration transducer group, when there are series connection between optical fibre grating acceleration sensor
When structure, it is characterized in that the sensor of the same wavelength should use the armouring of the fixed differential length of setting to connect optical cable, i.e., 1 ×
When N fiber couplers realize the optical signal output of the roads N, the connection optical cable between the roads N and the roads N-1 differs the length of 50m.
6. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that institute
It includes non-equilibrium Michelson fiber-optic interferometer and carrier modulation circuit module to state non-equilibrium Michelson steller interferometer demodulation module；It is wherein non-
Balance the encapsulating structure that Michelson steller interferometer uses arm length difference 5mm；Carrier modulation circuit module uses embedded-type ARM chip.
7. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that institute
Power conditioner case is stated to form using high-fidelity music center level power supply cleaning module and linear power supply.
8. the Hydropower Plant vibration measurement monitoring device according to claim 1 based on Fibre Optical Sensor, it is characterized in that institute
The module designed based on SBRIO core boards that field programmable gate array module uses NI instruments is stated, acquisition channel uses 24
Acquisition precision, sample frequency are more than 100K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511015676.9A CN105628173B (en) | 2015-12-30 | 2015-12-30 | Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511015676.9A CN105628173B (en) | 2015-12-30 | 2015-12-30 | Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105628173A CN105628173A (en) | 2016-06-01 |
| CN105628173B true CN105628173B (en) | 2018-09-28 |
Family
ID=56043319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511015676.9A Active CN105628173B (en) | 2015-12-30 | 2015-12-30 | Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105628173B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289500A (en) * | 2016-07-20 | 2017-01-04 | 大连海事大学 | The remote supervision system of a kind of Miter Lock Gates safe condition and monitoring method thereof |
| CN109346268A (en) * | 2018-11-07 | 2019-02-15 | 山东泰开变压器有限公司 | A kind of high voltage large capcity shock type transformer being installed on hydropower station tail water platform and design method |
| CN110736535B (en) * | 2019-11-25 | 2022-12-30 | 山东大学 | Rock mass engineering stability monitoring vibrations sensor and system |
| CN111735529A (en) * | 2020-07-01 | 2020-10-02 | 哈尔滨电机厂有限责任公司 | Large-scale generator motor winding end vibration on-line monitoring device |
| CN112067892B (en) * | 2020-08-06 | 2023-10-13 | 北京自动化控制设备研究所 | Signal conversion synchronization device and signal conversion synchronization method using same |
| CN114337073B (en) * | 2021-12-30 | 2023-12-15 | 江苏法尔胜光电科技有限公司 | Motor abnormal vibration monitoring device based on weak reflection fiber bragg grating |
| CN114705283A (en) * | 2022-04-11 | 2022-07-05 | 河北工业大学 | Vibration measuring system for small motor |
| CN116990858B (en) * | 2023-09-25 | 2023-12-15 | 山东省科学院激光研究所 | Fiber bragg grating detector limiting device and fiber bragg grating detector |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007087040A2 (en) * | 2006-01-13 | 2007-08-02 | Luna Innovations Incorporated | Demodulation method and apparatus for fiber optic sensors |
| CN101715153A (en) * | 2009-12-02 | 2010-05-26 | 华中科技大学 | Hybrid wavelength-division and time-division multiplexing passive sensing optical network |
| CN102519501A (en) * | 2011-12-20 | 2012-06-27 | 厦门大学 | Optical fiber multichannel perimeter sensing system comprising wavelength division multiplexer |
| CN103017804A (en) * | 2012-12-26 | 2013-04-03 | 中国科学院上海光学精密机械研究所 | High-time-synchronization multichannel fiber bragg grating sensing system |
| CN203519025U (en) * | 2013-08-08 | 2014-04-02 | 北京铁科工程检测中心 | High-speed fiber grating demodulation system |
| CN203551102U (en) * | 2013-10-09 | 2014-04-16 | 山东省科学院激光研究所 | On-line monitoring system for vibration spectrum of fiber grating of transformer |
| CN104567958A (en) * | 2015-01-05 | 2015-04-29 | 华中科技大学 | Distributed micro-structure sensor network based on time division and wavelength division multiplexing and using method thereof |
| CN104655162A (en) * | 2015-03-10 | 2015-05-27 | 合肥睿泰光子科技有限公司 | High-speed synchronous fiber bragg grating analyzer |
-
2015
- 2015-12-30 CN CN201511015676.9A patent/CN105628173B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007087040A2 (en) * | 2006-01-13 | 2007-08-02 | Luna Innovations Incorporated | Demodulation method and apparatus for fiber optic sensors |
| CN101715153A (en) * | 2009-12-02 | 2010-05-26 | 华中科技大学 | Hybrid wavelength-division and time-division multiplexing passive sensing optical network |
| CN102519501A (en) * | 2011-12-20 | 2012-06-27 | 厦门大学 | Optical fiber multichannel perimeter sensing system comprising wavelength division multiplexer |
| CN103017804A (en) * | 2012-12-26 | 2013-04-03 | 中国科学院上海光学精密机械研究所 | High-time-synchronization multichannel fiber bragg grating sensing system |
| CN203519025U (en) * | 2013-08-08 | 2014-04-02 | 北京铁科工程检测中心 | High-speed fiber grating demodulation system |
| CN203551102U (en) * | 2013-10-09 | 2014-04-16 | 山东省科学院激光研究所 | On-line monitoring system for vibration spectrum of fiber grating of transformer |
| CN104567958A (en) * | 2015-01-05 | 2015-04-29 | 华中科技大学 | Distributed micro-structure sensor network based on time division and wavelength division multiplexing and using method thereof |
| CN104655162A (en) * | 2015-03-10 | 2015-05-27 | 合肥睿泰光子科技有限公司 | High-speed synchronous fiber bragg grating analyzer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105628173A (en) | 2016-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105628173B (en) | Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor | |
| RU2672772C2 (en) | Rail measuring system | |
| US10605590B2 (en) | Fiber optic voltage conditioning | |
| CN102003970B (en) | Dynamic signal demodulation method for fiber laser sensor | |
| CN106680535B (en) | The differential-type optical accelerometer of laser beat frequency is realized based on Fiber Bragg Grating Reflective Spectrum Characteristics | |
| US10031246B2 (en) | RF-photonic system for acoustic and/or vibrational sensing using optical fiber and method thereof | |
| CN104848980B (en) | Bridge cable Suo Li online test methods and system based on Fibre Optical Sensor | |
| CN201589842U (en) | Local discharging optical fiber detection device of transformer | |
| CN103900623B (en) | Optical time domain reflectometer and its common mode inhibition method based on alliteration optical modulator | |
| US20100054935A1 (en) | Wind Turbine Having a Sensor System for Detecting Deformation in a Wind Turbine Rotor Blade and Corresponding Method | |
| RU2485454C2 (en) | Distributed fibre-optic system of vibroacoustic signals registration | |
| CN205940820U (en) | Pantograph receives stream mode bow net contact force detection device and measures car | |
| CN103175849B (en) | Optical fiber on-line vehicle bearing fault detection device | |
| CN100445697C (en) | Cavity length demodulating algorithm of fibre-optical F-P sensor | |
| CN109781240A (en) | Optical fibre vibration sensor phase demodulating device and method based on dual wavelength regression analysis | |
| CN102445581A (en) | Capacitive voltage-division type self-calibration optical voltage transducer | |
| CN106500822A (en) | Based on the transformer core system of condition monitoring that M Z interferometers are demodulated | |
| CN107085130A (en) | Using the polarization insensitive electric current and magnetic field sensor of active compensation | |
| CN105387923A (en) | Great-angle tilted fiber bragg grating mechanical vibration sensing array and system | |
| JPH0277626A (en) | Fiber optical vibration sensor | |
| CN106153978A (en) | Flow velocity based on optical fiber MEMS method amber microcavity test device and method of testing | |
| US20200055401A1 (en) | Optical monitoring system | |
| Min et al. | The research of vibration monitoring system for transformer based on optical fiber sensing | |
| CN104121983A (en) | Birefringence optical fiber environment based vibration dynamic monitoring system and method | |
| KR100575244B1 (en) | Temperature compensating optical current transformer using fiber bragg grating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |