CN203551102U - On-line monitoring system for vibration spectrum of fiber grating of transformer - Google Patents
On-line monitoring system for vibration spectrum of fiber grating of transformer Download PDFInfo
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- CN203551102U CN203551102U CN201320620060.4U CN201320620060U CN203551102U CN 203551102 U CN203551102 U CN 203551102U CN 201320620060 U CN201320620060 U CN 201320620060U CN 203551102 U CN203551102 U CN 203551102U
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Abstract
Provided is an on-line monitoring system for a vibration spectrum of a fiber grating of a transformer. The on-line monitoring system for the vibration spectrum of the fiber grating of the transformer is characterized in that the on-line monitoring system comprises at least a group of fiber grating vibration acceleration sensor set arranged on a transformer body or in the transformer, a fiber grating vibration acceleration sensor array formed by the fiber grating vibration acceleration sensor set is connected with a broadband light source via one terminal of a wavelength division multiplexer, and the other terminal of the wavelength division multiplexer is connected with an optical signal demodulation device via an optical isolator. A time domain spectrum and a frequency domain spectrum are obtained via the dada analysis by a data processor in the optical signal demodulation device, and an effective vibration signal wave spectrogram is obtained after a wavelet transform analysis. According to the on-line monitoring system, synchronous acquisition of vibration signals of the transformer is achieved, the safe technology of fiber sensing is employed, the fiber grating is disposed in the transformer or on the external transformer body so that the anti-interference ability of the vibration signals is enhanced, the vibration states of a transformer winding and an iron core during operation are truly reflected, and precise monitoring data is provided for the long-term and stable operation of the transformer.
Description
Technical field
This programme relates to electrical Equipment On-Line Monitoring System, particularly a kind of transformer optical fiber raster vibration wave spectrum on-line monitoring system.
Background technology
Main transformer of transformer substation is very important equipment in intelligent substation, and its reliability service is most important for the stable operation of transformer substation system.There is the risk of DC magnetic biasing in transformer, may occur vibration and the noise index phenomenon that suddenly raises.The transformer vibration signal of normal operation, energy mainly concentrates between 100Hz-600Hz, and comprises abundant resonant frequency information, is greater than 1000Hz and decays to gradually zero.Vibration is mainly derived from basket vibration and iron coring vibration.Basket vibration be mainly due to electric current during by winding between winding, between line handle, between wire turn, produce dynamic electric magnetic attraction and cause.Along with rolling up of load capacity, the impulsive force that cutting-out of voltage changer forms causes very large harm to winding, can cause winding deformation, because the deformation of winding has cumulative effect, when acquiring a certain degree, can cause winding insulation to damage, destroy the mechanical stability of winding, cause potential risk to the operation of transformer.Vibration unshakable in one's determination is mainly due to due to the magnetostriction of siliconized plate.When the snap-in force of iron core inside transformer is large not, the deadweight of siliconized plate will make iron core produce flexural deformation, cause magnetostriction to increase, i.e. the vibration of iron core aggravation.
Existing method is all by piezoelectric acceleration sensor monitoring vibration signal, propose herein a kind of strong interference immunity, insulativity high, without the optical fiber raster vibration on-line monitoring method of electric charge, to Real-time Obtaining transformer vibrational spectrum, monitor that its ruuning situation under DC magnetic biasing is carried out effective state analysis and acquisition long-time running vibration data has very important significance.
Summary of the invention
The utility model proposes a kind of transformer optical fiber raster vibration wave spectrum on-line monitoring system, the ruuning situation to transformer that can be real-time, long-term is monitored, vibrational spectrum is provided, the state of vibration is analyzed to judgement simultaneously, safeguard the work of transformer stability and safety.
For achieving the above object, the technical solution adopted in the utility model is: a kind of transformer optical fiber raster vibration wave spectrum on-line monitoring system, it is characterized in that it comprises is arranged on transformer with it or at least one group of optical fiber raster vibration groups of acceleration sensors of transformer inside, the optical fiber raster vibration acceleration transducer array being formed by optical fiber raster vibration groups of acceleration sensors is connected with wideband light source by wavelength division multiplexer, and wavelength division multiplexer is connected with light signal demodulating equipment by optoisolator.
The concrete feature of this programme also has, and described light signal demodulating equipment comprises the non-equilibrium Michelson interferometer being connected with optoisolator; Non-equilibrium Michelson interferometer is connected with opto-electronic conversion filter unit through wavelength division multiplexer; The electric signal of opto-electronic conversion filter unit output is delivered to data processor through data acquisition unit.
Wideband light source sends incident optical signal, by wavelength division multiplexer laggard enter optical fiber grating vibration acceleration sensor array, then from vibration acceleration sensor array reflected light signal out again by entering non-equilibrium Michelson interferometer wavelength division multiplexer and isolator; Data carrier unit, data acquisition unit and non-equilibrium Michelson interferometer composition band feedback self-regulation carrier modulator, convert reflected light signal wavelength variations to phase place and change; The reflected light signal that carries phase place variation after non-equilibrium Michelson interferometer is connected to wavelength division multiplexer, thereby the reflected light signal of each wave band is pressed to wavelength division, enters respectively the each passage of opto-electronic conversion filter unit; Opto-electronic conversion filter unit electric signal corresponding to the each wave band optical signal after separating converts to and delivers to data processor by data acquisition unit high speed acquisition.
Described optical fiber raster vibration acceleration transducer comprises shell, is provided with two-armed spider in shell, and two-armed spider comprises left arm and right arm, and left arm end is fixedly installed spring leaf, is fixedly installed little mass and large mass on the other end of spring leaf; Right arm end arranges fiber-optic fixing-hole; Fiber grating enters shell from a band tail end protection optical fiber entrance, and optical fiber is fixed on fiber-optic fixing-hole and little mass, and portion passes from a band tail end protection optical fiber outlet after being wound around in the enclosure.
The shell of described optical fiber raster vibration acceleration transducer is made by aluminium alloy or Teflon material, and large mass and little mass are made by copper, aluminium, pottery or Teflon material.
Fiber grating is fixed on fiber-optic fixing-hole and little mass by high-temperature corrosion resistance electrician glue.
Described optical fiber raster vibration groups of acceleration sensors is in series by optical fiber raster vibration acceleration transducer, 6 the optical fiber raster vibration acceleration transducers of connecting on an optical fiber, and expand by group, its wavelength is between 1530nm-1545nm, divide 6 wave bands of 2.4nm at interval, and sensor resonant frequency designs more than 800Hz.
Described wideband light source is the smooth wideband light source of C-band ASE, wavelength 1525nm-1565nm.
Described opto-electronic conversion filter unit adopts high-accuracy, low distortion operational amplifier A D8067, and unit background noise is lower than 1mV, for faint optical signal being carried out to opto-electronic conversion and carrying out bandpass filtering treatment.
Described data processor is industrial control mainboard (band CPU and display system) or the embedded control system that possesses data processing function.
The beneficial effect of this programme is, by being arranged on transformer with it or the optical fiber raster vibration acceleration transducer array group of transformer inside synchronously detects the vibration of Transformer Winding, iron core; The features such as it is high that transformer optical fiber raster vibration wave spectrum on-line monitoring system has measuring accuracy, and dynamic response is sensitive, the vibrational spectrum analytical database in the time of can setting up transformer operation, provides effective state analysis data; Especially vibration acceleration sensor is for adopting fiber grating to make structure, have that volume is little, insulation completely, be not subject to the features such as electromagnetic interference (EMI), Applicative time cycle are long, can be placed directly in the inner iron core of transformer or winding, measure and record transformer long-time running state, better data analysis is provided to transformer stable operation and maintenance, there is the economic benefit that greatly reduces operation maintenance cost.
Accompanying drawing explanation
Fig. 1 is transformer optical fiber raster vibration wave spectrum monitoring system structural drawing; Fig. 2 is single vibration acceleration sensor inner structure and outside drawing; Fig. 3 is vibration transducer installation testing data spectrum figure;
In Fig. 2: the little mass of 1-; The large mass of 2-; 3-spring leaf; 4-internal stent joint pin (for maintain internal Optical Fiber Winding); A 5-band tail end protection optical fiber entrance; A 6-band tail end protection optical fiber outlet; 7-silicone oil perfusion entrance; 8-left arm; 9-right arm; 10-magnet mounting groove (for the adsorptive power of sensor is provided); 11-fiber-optic fixing-hole; 12-two-armed spider; 13-shell; 14-optical fiber; 15-fiber grating.
Embodiment
As shown in Figure 1, a kind of transformer optical fiber raster vibration wave spectrum on-line monitoring system, it comprises and is arranged on transformer with it or at least one group of optical fiber raster vibration groups of acceleration sensors of transformer inside, the optical fiber raster vibration acceleration transducer array being formed by optical fiber raster vibration groups of acceleration sensors is connected with wideband light source by wavelength division multiplexer, and wavelength division multiplexer is connected with light signal demodulating equipment by optoisolator.Described light signal demodulating equipment comprises the non-equilibrium Michelson interferometer being connected with optoisolator; Non-equilibrium Michelson interferometer is connected with opto-electronic conversion filter unit through wavelength division multiplexer; The electric signal of opto-electronic conversion filter unit output is delivered to data processor through data acquisition unit.Wideband light source sends incident optical signal, by wavelength division multiplexer laggard enter optical fiber grating vibration acceleration sensor array, then from vibration acceleration sensor array reflected light signal out again by entering non-equilibrium Michelson interferometer wavelength division multiplexer and isolator; Data carrier unit, data acquisition unit and non-equilibrium Michelson interferometer composition band feedback self-regulation carrier modulator, convert reflected light signal wavelength variations to phase place and change; Then as shown in Figure 1, the reflected light signal that carries phase place variation after non-equilibrium Michelson interferometer is connected to wavelength division multiplexer, thereby the reflected light signal of each wave band is pressed to wavelength division, enters respectively the each passage of opto-electronic conversion filter unit; Opto-electronic conversion filter unit electric signal corresponding to the each wave band optical signal after separating converts to and delivers to data processor by data acquisition unit high speed acquisition.
Described optical fiber raster vibration groups of acceleration sensors is in series by optical fiber raster vibration acceleration transducer, 6 the optical fiber raster vibration acceleration transducers of connecting on an optical fiber, and expand by group, its wavelength is between 1530nm-1545nm, divide 6 wave bands of 2.4nm at interval, and sensor resonant frequency designs more than 800Hz.
Described wideband light source is the smooth wideband light source of C-band ASE, wavelength 1525nm-1565nm.
Described opto-electronic conversion filter unit adopts high-accuracy, low distortion operational amplifier A D8067, and unit background noise is lower than 1mV, for faint optical signal being carried out to opto-electronic conversion and carrying out bandpass filtering treatment.
As shown in Figure 1, described non-equilibrium Michelson interferometer is characterized by by forming a band feedback self-regulation carrier modulation mini system with data carrier unit (DAC) and data acquisition unit (ADC), thereby improves stability and the precision of carrier modulation; Concrete mode is on the inside of non-equilibrium Michelson interferometer piezoelectric ceramics (PZT), to obtain the feedback voltage signal of micro-power that stretches, and this feedback voltage signal is sent and data acquisition (ADC) unit, thereby form an automatic fine tuning system during with the non-equilibrium Michelson interferometer of data carrier unit (DAC) carrier modulation.
Described non-equilibrium Michelson interferometer winding optical fiber two ends arm length difference must be less than or equal to 5mm, and respectively adopts a slice faraday rotation mirror to eliminate polarization effect at two arm ends.Non-equilibrium Michelson interferometer passes through carrier modulation sensor reflected light signal, thereby utilizes the relation of phase differential to carry out phase demodulating vibration signal.
Described data carrier unit (DAC), for generation of the sinusoidal carrier voltage signal of modulation interferometer, frequency range is at 5kHz-10kHz; Data acquisition unit (ADC), for synchronous acquisition carrier signal and the filtered transducing signal of opto-electronic conversion, frequency acquisition is for being greater than 100kHz; Between described data carrier unit (DAC) and data acquisition unit (ADC), there is the association of carrier wave output triggering collection, when carrier signal output, just enable ADC unit and gather, keep phase place consistent; Wherein carrier wave sine wave output signal, precision is 12; Sampling precision is 16, sample frequency be 100 kHz and more than.
As shown in Figure 1, optical fiber raster vibration acceleration transducer is 6 one group, and the form of composition sensor array is arranged on the corresponding two side of transformer body; Fiber-optic grating sensor is installed and is taked with shunt box, each sensor to be installed in parallel, and the mode of an optical fiber series connection transmission, finally directly transfers to reflected light signal Substation control chamber by a multifiber cable.
The reflected light signal that transfers to pulpit enters the non-equilibrium Michelson interferometer of 5 kHz carrier modulation, by differing the light channel structure of arm length difference of 5mm and faraday rotation mirror FRM, eliminate and the transformer vibration signal of optical signal detecting is converted into catoptrical phase place after polarization effect and changes, and utilize the opto-electronic conversion filter unit based on AD8067 that light signal conversion is enlarged into the effective voltage signal in positive and negative 10V.
In Fig. 1, between non-equilibrium Michelson interferometer and opto-electronic conversion filter unit, need to add dense wave division multiplexer (DWDM) that 6 road optical fiber raster vibration acceleration transducer signals are carried out according to wavelength separate, the wavelength of choosing is 6 channel spacing 300GHz(2.4nm); Centre wavelength standard 1530.3nm, 1532.68nm, 1535.04nm, 1537.4nm, 1539.77nm, 1542.14nm; The opto-electronic conversion filter unit based on AD8067 adopting is 6 channel modules, and its local noise is lower than 1mV.
The I measuring acceleration amount of system is 0.5mg, and monitoring vibration frequency range is 10Hz-1kHz, and institute's measuring acceleration maximum range is 5g.
The DA passage that data carrier unit (DAC) and data acquisition unit (ADC) are carried by Ling Hua PCI-9111HR capture card itself and AD passage practical function.Ling Hua PCI-9111HR capture card can be exported 5KHz, and precision is the analog carrier signal of 12, and inside completes carrier wave and trigger 16 ADC and gather, and picking rate is 100KHz;
Data processor adopts and grinds the industrial computer system that magnificent AIMB-212D mainboard forms.After Ling Hua PCI9111HR capture card, the six passage vibration signals that gather will be delivered to and grind magnificent AIMB-212D mainboard and carry out data processing, as shown in Figure 3, during certain 220kV transforming plant main transformer actual motion, stick a measured one group of signal collection of illustrative plates experimental data of vibration acceleration sensor, vibration signal can find out that after Fourier transform this sensor and system can detect in the vibration signal spectrogram of normal operating transformer device body that peak value is around 100Hz and around 100Hz frequency-doubled signal, this test experiments also matches with the vibration monitoring theory of the normal operation of transformer in theory.In order to analyze the running status of transformer, even analyze the fault of transformer and localization of fault further, need the long-term image data of multiple sensors, and to time domain, frequency spectrum with set up Wavelet Entropy Envelope Analysis, the vibrational spectrum of the real-time running state of transformer so just can be provided, for analyzing the fault of transformer and localization of fault, provide the long-time running data of use.
As shown in Figure 1, adopt non-equilibrium interferometer can adopt MZI-15-50 interferometer or Beijing semiconductor fibre optic interferometer.
As shown in Figure 2, described optical fiber raster vibration acceleration transducer comprises shell 13, is provided with two-armed spider 12 in shell 13, and two-armed spider 12 comprises left arm 8 and right arm 9, left arm 8 ends are fixedly installed spring leaf 3, are fixedly installed little mass 1 and large mass 2 on the other end of spring leaf 3; Right arm 9 ends arrange fiber-optic fixing-hole 11; Optical fiber 14 enters shell from a band tail end protection optical fiber entrance 5, and fiber grating 15 is fixed on fiber-optic fixing-hole 11 and little mass 1, and portion passes from a band tail end protection optical fiber outlet 6 after being wound around in the enclosure.
The shell of optical fiber raster vibration acceleration transducer is made by aluminium alloy or Teflon material, and little mass 1 and large mass 2 are made by materials such as copper, aluminium, pottery or Teflons; In Fig. 2, optical fiber raster vibration acceleration transducer array group can be mounted on transformer body wall, also can be fixed on the inner iron core of transformer and folder.Be placed on the outside device body of transformer aluminium alloy quality piece and make, and be placed on, transformer is inner to be made of Teflon material or stupalith encapsulation, and transducer sensitivity is 1000mV/g.
In Fig. 2, be provided with magnet mounting groove 10 in shell, can conveniently sensor be fixed on transformer tank body wall, sensor can when transformer is inner;
In Fig. 2, on shell, be provided with silicone oil perfusion entrance 7, for pouring into enhanced sensitivity liquid (as silicone oil) etc. to sensor internal;
In Fig. 2, be provided with internal stent joint pin 4 in shell, post mass color is sliding, can facilitate Optical Fiber Winding and play certain fixation;
Wherein direction is to measure longitudinal vibration acceleration as shown in Figure 2, if 90 ° of rotations of sensor are installed, can measure horizontal vibration acceleration.
Claims (9)
1. a transformer optical fiber raster vibration wave spectrum on-line monitoring system, it is characterized in that it comprises is arranged on transformer with it or at least one group of optical fiber raster vibration groups of acceleration sensors of transformer inside, the optical fiber raster vibration acceleration transducer array being formed by optical fiber raster vibration groups of acceleration sensors is connected with wideband light source by wavelength division multiplexer, and wavelength division multiplexer is connected with light signal demodulating equipment by optoisolator.
2. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 1, is characterized in that described light signal demodulating equipment comprises the non-equilibrium Michelson interferometer being connected with optoisolator; Non-equilibrium Michelson interferometer is connected with opto-electronic conversion filter unit through wavelength division multiplexer; The electric signal of opto-electronic conversion filter unit output is delivered to data processor through data acquisition unit.
3. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 2, it is characterized in that wideband light source sends incident optical signal, by wavelength division multiplexer laggard enter optical fiber grating vibration acceleration sensor array, then from vibration acceleration sensor array reflected light signal out again by entering non-equilibrium Michelson interferometer wavelength division multiplexer and isolator; Data carrier unit, data acquisition unit and non-equilibrium Michelson interferometer composition band feedback self-regulation carrier modulator, convert reflected light signal wavelength variations to phase place and change; The reflected light signal that carries phase place variation after non-equilibrium Michelson interferometer is connected to wavelength division multiplexer, thereby the reflected light signal of each wave band is pressed to wavelength division, enters respectively the each passage of opto-electronic conversion filter unit; Opto-electronic conversion filter unit electric signal corresponding to the each wave band optical signal after separating converts to and delivers to data processor by data acquisition unit high speed acquisition.
4. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 1, it is characterized in that described optical fiber raster vibration acceleration transducer comprises shell, in shell, be provided with two-armed spider, two-armed spider comprises left arm and right arm, left arm end is fixedly installed spring leaf, is fixedly installed little mass and large mass on the other end of spring leaf; Right arm end arranges fiber-optic fixing-hole; Fiber grating enters shell from a band tail end protection optical fiber entrance, and optical fiber is fixed on fiber-optic fixing-hole and little mass, and portion passes from a band tail end protection optical fiber outlet after being wound around in the enclosure.
5. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 4, the shell that it is characterized in that described optical fiber raster vibration acceleration transducer is made by aluminium alloy or Teflon material, and large mass and little mass are made by copper, aluminium, pottery or Teflon material.
6. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 4, is characterized in that fiber grating is fixed on fiber-optic fixing-hole and little mass by high-temperature corrosion resistance electrician glue.
7. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 1, it is characterized in that described optical fiber raster vibration groups of acceleration sensors is in series by optical fiber raster vibration acceleration transducer, 6 the optical fiber raster vibration acceleration transducers of connecting on an optical fiber, and expand by group, its wavelength is between 1530nm-1545nm, divide 6 wave bands of 2.4nm at interval, and sensor resonant frequency designs more than 800Hz.
8. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 1, is characterized in that described wideband light source is the smooth wideband light source of C-band ASE, wavelength 1525nm-1565nm.
9. transformer optical fiber raster vibration wave spectrum on-line monitoring system according to claim 2, it is characterized in that described opto-electronic conversion filter unit adopts high-accuracy, low distortion operational amplifier A D8067, and unit background noise is lower than 1mV, for faint optical signal being carried out to opto-electronic conversion and carrying out bandpass filtering treatment.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104848927A (en) * | 2015-05-21 | 2015-08-19 | 武汉理工大学 | Vibration detection system based on chirped grating sensing and wavelength division multiplexing technology |
| CN104964737A (en) * | 2015-07-20 | 2015-10-07 | 广东电网有限责任公司电力科学研究院 | Device for measuring transformer winding vibration caused by transformer intruding wave |
| CN105628173A (en) * | 2015-12-30 | 2016-06-01 | 山东省科学院激光研究所 | Hydropower station set vibration measurement monitoring device based on optical fiber sensing |
| CN105806467A (en) * | 2016-03-25 | 2016-07-27 | 国家电网公司 | High-voltage shunt reactor iron core vibration measurement device and measurement method |
| CN106500822A (en) * | 2016-11-28 | 2017-03-15 | 华北电力大学 | Based on the transformer core system of condition monitoring that M Z interferometers are demodulated |
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| CN104964737B (en) * | 2015-07-20 | 2017-11-21 | 广东电网有限责任公司电力科学研究院 | The transformer winding vibration measurement apparatus that transformer Intruding wave triggers |
| CN104964737A (en) * | 2015-07-20 | 2015-10-07 | 广东电网有限责任公司电力科学研究院 | Device for measuring transformer winding vibration caused by transformer intruding wave |
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| CN105628173B (en) * | 2015-12-30 | 2018-09-28 | 山东省科学院激光研究所 | Hydropower Plant vibration measurement monitoring device based on Fibre Optical Sensor |
| CN105806467A (en) * | 2016-03-25 | 2016-07-27 | 国家电网公司 | High-voltage shunt reactor iron core vibration measurement device and measurement method |
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| CN106646097A (en) * | 2016-11-28 | 2017-05-10 | 华北电力大学 | Transformer winding deformation on-line monitoring system by employing fiber grating strain sensors |
| CN106500822A (en) * | 2016-11-28 | 2017-03-15 | 华北电力大学 | Based on the transformer core system of condition monitoring that M Z interferometers are demodulated |
| CN107884059A (en) * | 2017-10-27 | 2018-04-06 | 北京航天控制仪器研究所 | A kind of fiber laser hydrophone light channel structure and signal demodulating method |
| CN108362312A (en) * | 2018-02-28 | 2018-08-03 | 山东省科学院激光研究所 | Wavelength demodulation device and system |
| CN108362312B (en) * | 2018-02-28 | 2021-04-30 | 山东省科学院激光研究所 | Wavelength demodulation device and system |
| CN108168686A (en) * | 2018-03-14 | 2018-06-15 | 中国科学院半导体研究所 | Dual wavelength distribution type fiber-optic sound sensor-based system |
| CN108168686B (en) * | 2018-03-14 | 2020-01-31 | 中国科学院半导体研究所 | Dual-wavelength distributed optical fiber acoustic sensing system |
| CN108981767A (en) * | 2018-08-17 | 2018-12-11 | 山东省科学院激光研究所 | Optical fiber distributed type monitors system and method |
| US11193819B2 (en) | 2018-12-24 | 2021-12-07 | Industrial Technology Research Institute | Vibration sensor with monitoring function and vibration signal monitoring method thereof |
| CN112033521A (en) * | 2020-08-07 | 2020-12-04 | 太原理工大学 | Local noise self-filtering hybrid optical fiber vibration sensing system |
| CN112033521B (en) * | 2020-08-07 | 2022-03-15 | 太原理工大学 | Local noise self-filtering hybrid optical fiber vibration sensing system |
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