CN106949838A - A kind of optic fiber displacement sensor system - Google Patents
A kind of optic fiber displacement sensor system Download PDFInfo
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- CN106949838A CN106949838A CN201710159760.0A CN201710159760A CN106949838A CN 106949838 A CN106949838 A CN 106949838A CN 201710159760 A CN201710159760 A CN 201710159760A CN 106949838 A CN106949838 A CN 106949838A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 94
- 239000000835 fiber Substances 0.000 title claims abstract description 59
- 239000000523 sample Substances 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 238000012805 post-processing Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000013307 optical fiber Substances 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
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- 238000009776 industrial production Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 16
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Classifications
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
Abstract
The present invention relates to a kind of optic fiber displacement sensor system, mainly solve the technical problem that environmental suitability is poor, such environmental effects are big, stability is poor present in prior art, the present invention is by using including signal source, object under test, the bisection power splitter being connected with signal source；Halve the output end of power splitter first connection directly modulated lasers；Directly modulated lasers connection method using in optic fiber displacement sensor probe；Method using in optic fiber displacement sensor probe is connected with high-speed photodetector；IQ frequency mixers rf inputs and the high-speed photodetector, local oscillator input are connected with halving the output end of power splitter second, and output end is sequentially connected post-processing module；Signal source is used to export microwave signal, and microwave signal is changed into optical carrier after halving power splitter by directly modulated lasers；High-speed photodetector is used to change technical scheme of the lightwave signal into microwave signal, the problem is preferably resolved, available in the industrial production of optical fibre displacement sensor.
Description
Technical field
The present invention relates to sensor field, available for the communications field, in medicine equipment, a kind of fiber optics displacement is related specifically to
Sensor-based system.
Background technology
Sensor develops towards sensitive, accurate, strong adaptability, compact and intelligentized direction.In this course, light
The newcomer of this sensor family of fiber sensor gains great popularity.Optical fiber has many excellent performances, including anti-electromagnetism and original
The performance of sub- radiation interference, footpath is thin, matter is soft, lightweight mechanical performance；Insulation, inductionless electric property；Water-fast, resistance to height
Warm, corrosion resistant chemical property etc., it can play a part of the knowledge of people in such as high-temperature region, such as nuclear radiation area, and can also
Surmount the physiological limits of people, the external information that the sense organ of recipient is not felt by.The basic functional principle of fibre optical sensor is
Optical signal from light source is sent into modulator by optical fiber, makes parameter to be measured with entering after the light interaction of modulator zone, leads
Cause the optical property of light to change, as the signal source modulated, photo-detector is being sent into by optical fiber, it is demodulated, obtain
Obtain measured parameter.
Current optical fibre displacement sensor mainly has fiber grating, the sensing of the type such as Fabry-perot optical fiber and Fiber-M-Z interferometer
Device.The technical problem that optic fiber displacement sensor system of the prior art is present is that the environmental suitability of sensor is poor, optical signal
Shake, the change of the factor such as environment temperature is very big to the performance impact of sensor.Therefore it provides one kind is not by environmental factor shadow
The high optic fiber displacement sensor system of sound, stability is just necessary.
The content of the invention
The technical problems to be solved by the invention are that have the technology that environmental suitability is looked into, stability is low in the prior art to ask
Topic.A kind of optic fiber displacement sensor system is provided, fiber optics displacement system tool measuring speed is fast, and measurement range is big, and not by ring
The features such as influence of border factor.
In order to solve the above technical problems, the technical scheme used is as follows：
A kind of optic fiber displacement sensor system, the optic fiber displacement sensor system includes signal source 101, object under test, with letter
The bisection power splitter that number source 101 is connected；The bisection power splitter 103 first output end connection directly modulated lasers 102；It is described
The connection method using in optic fiber displacement sensor of directly modulated lasers 102 probe 106；The method using in optic fiber displacement sensor probe 106 and high-speed photodetector
104 connections；The rf inputs of IQ frequency mixers 105 and the high-speed photodetector 104, local oscillator input is with halving work(
Divide the connection of the output end of device second, output end is sequentially connected post-processing module；The signal source 101 is used to export microwave signal, micro-
Ripple signal is modulated to optical carrier after halving the distribution of power splitter 103 by directly modulated lasers 102；The high-speed light electrical resistivity survey
Surveying device 104 is used for the lightwave signal for changing the output of method using in optic fiber displacement sensor probe 106 into microwave signal；The IQ frequency mixers
105 are used to rf inputs signal being divided into orthogonal I roads signal and Q roads are liked, and I roads signal and Q roads signal are and local oscillator
Hold input signal mixing；The post-processing module is used to demodulate mixer output signal for object under test displacement.
In above-mentioned technical proposal, for optimization, further, institute's method using in optic fiber displacement sensor probe 106 includes sleeve 301, solid
Optical cable 302 and beam-expanding collimation lens 303 on sleeve 301；The optical cable 302 include light launch single-mode fiber 203 and
The N cores multimode for being attached at the light transmitting surrounding of single-mode fiber 203 receives optical fiber 204；Wherein N is positive integer.
Further, the post-processing module includes signal amplifier 109, the number being sequentially connected with signal amplifier 109
According to Acquisition Circuit 201 and signal transacting and display module 202.
Further, the post-processing module also includes wave filter 108, and the wave filter 108 is connected to frequency mixer output
End and signal amplifier 109；The passband frequency range of wave filter 108 includes mixer output working frequency, the filtering
Device 108 is used to eliminate interference signal.
Further, the wave filter 108 is low pass filter, and the cut-off frequency of the low pass filter is more than frequency mixer
Output end working frequency.
Further, the data acquisition circuit 201 includes variable connector module, and the AD being connected with variable connector module is adopted
Egf block.
Further, the signal transacting and display module 202 include 2 microprocessing units being connected in parallel.
Further, it is LCD display that the signal transacting and display module, which include display module 202,.
Further, the signal transacting and display module 202 also include the current-limiting protection module and overvoltage protection of parallel connection
Module.
The high-frequency microwave signal that signal source 101 is exported is divided into two way microwave signals after power splitter 103, and microwave is believed all the way
Number enter directly modulated lasers 102 in, the laser by microwave signal be loaded into area of light and obtain a light carry microwave signal, the light
Carry microwave signal to be transferred in displacement sensing probe 106 by light transmitting single-mode fiber 203, the light passes through beam-expanding collimation lens
Incided after 303 beam-expanding collimations on the object 107 of displacement to be measured, the reflected light on the surface of determinand 107 is again by collimation
Lens 303 are simultaneously received by multimode reception optical fiber 204, and the output light load radiofrequency signal that multimode receives optical fiber is detected through high speed optoelectronic
It is changed into microwave signal after device 104, the microwave signal enters the rf inputs of IQ frequency mixers 105, another road of power splitter 103 is micro-
Ripple signal enters the local oscillator input of IQ frequency mixers 105, and the direct current signal of IQ frequency mixers I component and Q component passes through a low pass filtered
Passed sequentially through after ripple device 108 after signal amplification circuit 109 and data acquisition circuit and signal processing module, Demodulation Systems it is to be measured
The displacement of object is shown by display module.
The present invention also proposes a kind of displacement measurement signal analysis method based on displacement sensing system：Assuming that signal source is exported
The frequency of signal is f, and the signal obtains two identical microwave signals after power splitter 103, wherein all the way as local oscillation signal
The local oscillator input of IQ frequency mixers 105 is directly entered, the signal is represented by：
VoFor signal amplitude,For the initial phase of signal.Another road signal of power splitter output is adjusted by directly modulated lasers
Light is obtained after system and carries microwave signal, light load microwave signal is irradiated to after object under test incides high-speed photodetector through reflection
On.Assuming that the displacement of object under test is L, then because the change that light caused by the displacement carries microwave signal phase is turned toWherein c is the light velocity, thus causes the microwave signal that high-speed photodetector 104 is exported to be represented by：The microwave signal enters after IQ frequency mixers, and the signal is divided into two-way by frequency mixer,
Signal is mixed as I roads input radio frequency signal with local oscillation signal all the way, and another road signal is used as Q roads after 90 degree of phase shifts
Input radio frequency signal is also mixed with local oscillation signal, then I roads output signal is represented by：
Q roads output signal is represented by：
The two-way direct current signal that frequency mixer is exported is divided by and can obtained：
Thus, the displacement that can obtain object under test is：
From above formula, two DC voltage values exported according to IQ frequency mixers can be obtained by the displacement of current determinand
Amount.And the displacement is unrelated with the amplitude of measured signal.This greatly reduces optical signal shake and the influence of environmental factor
Influence to displacement measurement.The phase measurement accuracy of IQ frequency mixers is up to 0.050, when microwave signal frequency is 40GHz,
The displacement resolution of displacement sensing system proposed by the present invention is up to 1.05um.Because IQ frequency mixers can be realized across 3600 lanes
The measurement of phase, while the frequency by adjusting microwave signal, but displacement sensing measurement range proposed by the present invention is up to tens meters.
The workflow of this optic fiber displacement sensor system is simple, and after system electrification, signal source is opened, and displacement sensing probe is fixed on
The preceding surface of determinand, when object under test is moved formula, the display module of system will display current object in real time displacement.
Beneficial effects of the present invention：
Effect one, reduces the interference of outside environmental elements；
Effect two, improves stability；
Effect three, improves measurement sensitivity；
Effect four, improves highest displacement resolution.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1, the optic fiber displacement sensor system schematic diagram based on microwave phase demodulation apparatus.
Fig. 2, method using in optic fiber displacement sensor probe schematic diagram.
Fig. 3, optical cable end view.
Fig. 4, post-processing module schematic diagram.
In accompanying drawing, 101- signal sources；102- directly modulated lasers；103- power splitters；104- high-speed photodetectors；105-IQ
Frequency mixer；106- method using in optic fiber displacement sensor is popped one's head in；107- objects under test；108- low pass filters；109- signal amplification circuits；201-
Data acquisition circuit；202- signal transactings and display module；203- light transmitting single-mode fiber -204- multimodes receive optical fiber, 1031-
The output end of power splitter first, the output end of 1032- power splitters second.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Embodiment 1：
Such as Fig. 1, the present embodiment provides a kind of optic fiber displacement sensor system, and the fiber optics displacement system includes signal source
101st, object under test, the bisection power splitter being connected with signal source 101；The bisection power splitter 103 first output end connection
Directly modulated lasers 102；The connection of the directly modulated lasers 102 method using in optic fiber displacement sensor probe 106；The method using in optic fiber displacement sensor probe
106 are connected with high-speed photodetector 104；The rf inputs of IQ frequency mixers 105 and the high-speed photodetector 104,
Local oscillator input is connected with halving the output end of power splitter second, and output end is sequentially connected post-processing module；The signal source 101
For exporting microwave signal, microwave signal is modulated to light carrier after halving the distribution of power splitter 103 by directly modulated lasers 102
Signal；The high-speed photodetector 104 is used for the lightwave signal for changing the output of method using in optic fiber displacement sensor probe 106 into microwave
Signal；The IQ frequency mixers 105 are used to rf inputs signal being divided into orthogonal I roads signal and Q roads are liked, I roads signal
And Q roads signal is mixed with local oscillator end input signal；The post-processing module is used to demodulate mixer output signal for determinand
Displacement body amount.
Wherein, such as Fig. 2 and Fig. 3, method using in optic fiber displacement sensor probe 106 includes sleeve 301, and foundation is fixedly arranged on sleeve 301
Optical cable 302 and beam-expanding collimation lens 303；The optical cable 302 includes light and launches single-mode fiber 203 and be attached at light transmitting list
The multicore multimode of the surrounding of mode fiber 203 receives optical fiber 204.Probe, which is conducive to collecting mobile object to be measured to greatest extent, to be transmitted back to
The optical signal come, improves the sensitivity of whole displacement sensing system.
Two DC voltage values exported according to IQ frequency mixers can be obtained by the displacement of current determinand.And the position
Shifting amount is unrelated with the amplitude of measured signal.This greatly reduces optical signal shake and the influence of environmental factor to displacement measurement knot
The influence of fruit.The phase measurement accuracy of IQ frequency mixers is proposed by the present invention when microwave signal frequency is 40GHz up to 0.050
The displacement resolution of displacement sensing system is up to 1.05um.Because IQ frequency mixers can realize the measurement across 3600 phase cyclings, together
When by adjusting the frequency of microwave signal, but displacement sensing measurement range proposed by the present invention is up to tens meters.
Wherein, post-processing module includes signal amplifier 109, the data acquisition electricity being sequentially connected with signal amplifier 109
Road 201 and signal transacting and display module 202.Post-processing module is easy to data acquisition electricity by the way that mixed frequency signal is amplified
Road collection signal carries out data demodulation for signal transacting and display module, by demodulation and algorithm computing, calculates object under test
Displacement.
The data acquisition circuit 201 includes variable connector module, the AD sampling modules being connected with variable connector module.Number
According to acquisition module by variable connector module can in sequential interval log-on data acquisition module, module dissipation can be reduced,
The optic fiber displacement sensor system of low-power consumption is realized, cost is reduced.
The signal transacting and display module 202 include 2 microprocessing units being connected in parallel.By using in parallel 2
Individual microprocessing unit, can reduce the load of single microprocessing unit, improve the capacity of optic fiber displacement sensor system.
It is LCD display that the signal transacting and display module, which include display module 202, and the LCD display can pass through
Touch-screen carries out related setting or operation, can reduce button operation, improve structure space utilization rate.The signal transacting and aobvious
Show that module 202 also includes the current-limiting protection module and overvoltage protective module of parallel connection, by adding overcurrent protection and overvoltage protection mould
Block, improves the stability of system, reduces fault rate.
The operation principle of optic fiber displacement sensor system in the present embodiment：The high-frequency microwave signal that signal source 101 is exported passes through
It is divided into two way microwave signals after power splitter 103, microwave signal enters in directly modulated lasers 102 all the way, and the laser believes microwave
Number it is loaded into area of light and obtains a light and carry microwave signal, the light, which carries microwave signal, is launched single-mode fiber 203 by light and be transferred to
In displacement sensing probe 106, the light incides the object of displacement to be measured after the beam-expanding collimation of beam-expanding collimation lens 303
On 107, the reflected light on the surface of determinand 107 is again by collimation lens 303 and receives optical fiber 204 by multimode and receives, multimode
The output light load radiofrequency signal for receiving optical fiber is changed into microwave signal after high-speed photodetector 104, and the microwave signal enters IQ
The rf inputs of frequency mixer 105, another road microwave signal of power splitter 103 enters the local oscillator input of IQ frequency mixers 105, IQ
The direct current signal of frequency mixer I component and Q component demodulates the displacement of object under test by post-processing module, passes through display module
Display.
The workflow of this optic fiber displacement sensor system is simple, and after system electrification, signal source is opened, displacement sensing is visited
Head is fixed on the preceding surface of determinand, when object under test is moved formula, and the display module of system will display current object in real time
Displacement.
Embodiment 2
The present embodiment further improves post-processing module on the basis of embodiment 1, can further reduce extraneous factor
Interference to optic fiber displacement sensor system.
The post-processing module also includes wave filter 108, and the wave filter 108 is connected to mixer output and signal is put
Big device 109；The passband frequency range of wave filter 108 includes mixer output working frequency, and the wave filter 108 is used to disappear
Except interference signal.The wave filter 108 is low pass filter, and the cut-off frequency of the low pass filter is more than mixer output
Working frequency.
The interference signal outside frequency mixer working frequency is filtered by wave filter, can further reduce interference,
The particularly interference of environment factor.Stability, the sensitivity of optic fiber displacement sensor system in the present embodiment can be improved.
The present invention also proposes a kind of displacement measurement signal analysis method based on displacement sensing system：Assuming that signal source is exported
The frequency of signal is f, and the signal obtains two identical microwave signals after power splitter 103, wherein all the way as local oscillation signal
The local oscillator input of IQ frequency mixers 105 is directly entered, the signal is represented by：
VoFor signal amplitude,For the initial phase of signal.Another road signal of power splitter output is modulated by directly modulated lasers
After obtain light carry microwave signal, the light carry microwave signal be irradiated to after object under test through reflection incides high-speed photodetector
On.Assuming that the displacement of object under test is L, then because the change that light caused by the displacement carries microwave signal phase is turned toWherein c is the light velocity, thus causes the microwave signal that high-speed photodetector 104 is exported to be represented by：The microwave signal enters after IQ frequency mixers, and the signal is divided into two-way by frequency mixer,
Signal is mixed as I roads input radio frequency signal with local oscillation signal all the way, and another road signal is used as Q roads after 90 degree of phase shifts
Input radio frequency signal is also mixed with local oscillation signal, then I roads output signal is represented by：
Q roads output signal is represented by：
The two-way direct current signal that frequency mixer is exported is divided by and can obtained：
Thus, the displacement that can obtain object under test is：
From above formula, two DC voltage values exported according to IQ frequency mixers can be obtained by the displacement of current determinand
Amount.And the displacement is unrelated with the amplitude of measured signal.This greatly reduces optical signal shake and the influence of environmental factor
Influence to displacement measurement.The phase measurement accuracy of IQ frequency mixers is up to 0.050, when microwave signal frequency is 40GHz,
The displacement resolution of displacement sensing system proposed by the present invention is up to 1.05um.Because IQ frequency mixers can be realized across 3600 lanes
The measurement of phase, while the frequency by adjusting microwave signal, but displacement sensing measurement range proposed by the present invention is up to tens meters.
The workflow of this optic fiber displacement sensor system is simple, and after system electrification, signal source is opened, and displacement sensing probe is fixed on
The preceding surface of determinand, when object under test is moved formula, the display module of system will display current object in real time displacement.
Although illustrative embodiment of the invention is described above, in order to the technology of the art
Personnel are it will be appreciated that the present invention, but the present invention is not limited only to the scope of embodiment, to the common skill of the art
For art personnel, as long as long as various change is in the spirit and scope of the invention that appended claim is limited and is determined, one
The innovation and creation using present inventive concept are cut in the row of protection.
Claims (9)
1. a kind of optic fiber displacement sensor system, it is characterised in that：The fiber optics displacement system includes signal source (101), determinand
Body, the bisection power splitter being connected with signal source (101)；
Bisection power splitter (103) first output end (1031) the connection directly modulated lasers (102)；The directly modulated lasers
(102) connection method using in optic fiber displacement sensor probe (106)；The method using in optic fiber displacement sensor probe (106) and high-speed photodetector (104)
Connection；IQ frequency mixers (105) rf inputs and the high-speed photodetector (104), local oscillator input is with halving
The output end of power splitter second (1032) is connected, and output end is sequentially connected post-processing module；
The signal source (101) is used to export microwave signal, and microwave signal is through halving after power splitter (103) is distributed by directly adjusting
Laser (102) is modulated to optical carrier；
The lightwave signal that the high-speed photodetector (104) is used to change method using in optic fiber displacement sensor probe (106) output is
Microwave signal；
The IQ frequency mixers (105) are used to being divided into rf inputs signal into orthogonal I roads signal and Q roads signal, I roads signal and
Q roads signal is mixed with local oscillator end input signal；
The post-processing module is used to demodulate mixer output signal for object under test displacement.
2. optic fiber displacement sensor system according to claim 1, it is characterised in that：Institute's method using in optic fiber displacement sensor probe (106)
Including sleeve (301), optical cable (302) and beam-expanding collimation lens (303) on sleeve (301) are fixedly arranged on；The optical cable (302)
The N cores multimode launched single-mode fiber (203) including light and be attached at light transmitting single-mode fiber (203) surrounding receives optical fiber
(204)；
Wherein N is positive integer.
3. optic fiber displacement sensor system according to claim 1, it is characterised in that：The post-processing module is put including signal
Big device (109), the data acquisition circuit (201) and signal transacting and display module being sequentially connected with signal amplifier (109)
(202)。
4. optic fiber displacement sensor system according to claim 3, it is characterised in that：The post-processing module also includes filtering
Device (108), the wave filter (108) is connected to mixer output and signal amplifier (109)；The wave filter (108) is led to
Band frequency range includes mixer output working frequency, and the wave filter (108) is used to eliminate interference signal.
5. optic fiber displacement sensor system according to claim 4, it is characterised in that：The wave filter (108) is low pass
Wave filter, the cut-off frequency of the low pass filter is more than mixer output working frequency.
6. optic fiber displacement sensor system according to claim 3, it is characterised in that：Data acquisition circuit (201) bag
Variable connector module is included, the AD sampling modules being connected with variable connector module.
7. optic fiber displacement sensor system according to claim 3, it is characterised in that：The signal transacting and display module
(202) 2 microprocessing units being connected in parallel are included.
8. optic fiber displacement sensor system according to claim 3, it is characterised in that：Signal transacting and the display module bag
Display module (202) is included for LCD display.
9. according to the optic fiber displacement sensor system described in claim 8, it is characterised in that：The signal transacting and display module
(202) the current-limiting protection module and overvoltage protective module of parallel connection are also included.
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| CN108414114A (en) * | 2018-03-26 | 2018-08-17 | 李青 | A kind of optical fiber sensing probe and fiber temperature sensing system |
| CN108709506A (en) * | 2018-08-01 | 2018-10-26 | 天津博科光电科技有限公司 | A kind of method using in optic fiber displacement sensor probe and optic fiber displacement sensor system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108050939A (en) * | 2017-12-06 | 2018-05-18 | 柳州市融智科技服务有限公司 | A kind of displacement detector |
| CN108414114A (en) * | 2018-03-26 | 2018-08-17 | 李青 | A kind of optical fiber sensing probe and fiber temperature sensing system |
| CN108709506A (en) * | 2018-08-01 | 2018-10-26 | 天津博科光电科技有限公司 | A kind of method using in optic fiber displacement sensor probe and optic fiber displacement sensor system |
| CN108709506B (en) * | 2018-08-01 | 2023-11-10 | 天津博科光电科技有限公司 | Optical fiber displacement sensing probe and optical fiber displacement sensing system |
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