CN106482805A - A kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system and fault monitoring method - Google Patents
A kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system and fault monitoring method Download PDFInfo
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
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Abstract
The invention provides a kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system, including：Probe source, erbium-doped fiber amplifier, the first fiber coupler, optical circulator, 1 × N optical branching device, liquid level sensor and photodetector；The input of erbium-doped fiber amplifier is connected with the outfan of probe source, the input of the first fiber coupler is connected with the outfan of erbium-doped fiber amplifier, the first port of circulator is connected with the first outfan of the first fiber coupler, the second port of circulator is connected with the input port of 1 × N optical branching device, 1 × N optical branching device has multiple output ports, it is connected with the first port of the fiber delay line of multiple different lengths respectively, the second port of fiber delay line is connected with liquid level sensor；The first input end of photodetector is connected with the 3rd port of optical circulator, and the second input of photodetector is connected with the second outfan of the first fiber coupler；The input of data acquisition process equipment is connected with the outfan of photodetector.
Description
Technical field
The invention belongs to level gauging field, more particularly, to a kind of can real time fail monitoring multi-channel optical fibre liquid level
Measuring system and fault monitoring method.
Background technology
Level measuring technology industrially has extensive and important application.For example in petrochemical industry it is often necessary to survey
Liquid level in constant volume device；It is also desirable to closely be monitored to river level in terms of flood fighting flood control.Traditional level sensing
Device mainly has float-type, condenser type, resistance-type, pressure type and radar type etc..With the development of optical fiber sensing technology, application and liquid
The Fibre Optical Sensor of position measurement gets more and more, and compares traditional liquid level sensor, has small volume, lightweight, good insulating, safety
Property is good, electromagnetism interference, corrosion-resistant the advantages of.
Common fibre optic liquid level sensor mainly has fibre-optical microstructure liquid level sensor, Fiber Grating Liquid Depth Sensor, light
Fiber fabry-perot liquid level sensor etc..It is long that these fibre optic liquid level sensors are limited by fibre-optical microstructure length, grating grid region
The factors such as degree, Fabry-Perot interference cavity length, measurement range is less.The fibre optic liquid level sensor of report and level sensing
The usual measurement range of system can only achieve tens millimeters, and the liquid level of single-point can only be measured.Further, since optical fiber liquid level
In sensor testing liquid generally to be immersed in, the usual complicated component of these liquid even has corrosivity, and the fracture of optical fiber is easy
In generation；In complicated optical fiber sensing system, the quite time-consuming effort of malfunction elimination of optical fiber；Therefore system is sensed to optical fiber liquid level
System carries out malfunction monitoring and fault location is just particularly important.Traditional optical fiber liquid level sensor-based system is generally deficient of malfunction monitoring
With positioning function.
Content of the invention
For the defect of prior art, it is an object of the invention to provide a kind of multi-path light carrying out real time fail monitoring
Fine liquid level measuring system and fault monitoring method are it is intended to solving that traditional fiber liquid level sensor system measurement range is little, can only carrying out
Single-point level gauging, and be difficult to measuring system is carried out with the problem of malfunction monitoring and positioning.
The invention provides a kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system, including：Ring cavity type detects
Light source, erbium-doped fiber amplifier, the first fiber coupler, optical circulator, 1 × N optical branching device, liquid level sensor and photodetection
Device；The input of described erbium-doped fiber amplifier is connected with the outfan of described ring cavity type probe source, described first optical fiber coupling
The input of clutch is connected with the outfan of described erbium-doped fiber amplifier, the first port of described circulator and described first light
First outfan of fine bonder connects, and the second port of described circulator is connected with the input port of described 1 × N optical branching device
Connect, 1 × N optical branching device has multiple output ports, respectively the first port with the described fiber delay line of multiple different lengths
It is connected, the second port of described fiber delay line is connected with liquid level sensor；The first input end of described photodetector and institute
The 3rd port stating optical circulator is connected, the second input of described photodetector and the second of described first fiber coupler
Outfan connects；The input of described data acquisition process equipment is connected with the outfan of described photodetector.
Further, described first fiber coupler is 90：10 fiber coupler, described first fiber coupler
The optical signal of the first outfan output 90%, the optical signal of the second outfan output 10% of described first fiber coupler.
Further, described ring cavity type probe source includes：Semiconductor optical amplifier, optoisolator and the second optical fiber coupling
Clutch；The outfan of described semiconductor optical amplifier connects the input of described optoisolator, the outfan of described optoisolator
Connect the input of described second fiber coupler, the first outfan of described second fiber coupler connects semiconductor optical amplification
The input of device, forms ring cavity structure, the second outfan then output as ring cavity light source of the second fiber coupler.
Further, the second fiber coupler is 80：20 fiber coupler；The first of described second fiber coupler
The optical signal of outfan output 20%；The optical signal of the second outfan output 80% of described second fiber coupler.
Further, described liquid level sensor includes：First single-mode fiber, coreless fiber, the second single-mode fiber and light
Fine total reflective mirror；The two ends of described coreless fiber respectively with one end of described first single-mode fiber and described second single-mode fiber one
End connects, and the other end of described second single-mode fiber connects described optical fiber total reflective mirror, and the other end of described first single-mode fiber is even
Connect the second port of fiber delay line；Described coreless fiber is partially immersed in testing liquid, when liquid level changes, described
The length that coreless fiber is submerged also changes therewith, and the leakage of cladding mode in described coreless fiber also can change, impact
It transmits light intensity.
Further, described first single-mode fiber and the core diameter of described coreless fiber mismatch, and described second is single
Mode fiber is mismatched with the core diameter of described coreless fiber.
Present invention also offers a kind of fault monitoring method based on above-mentioned multi-channel optical fibre liquid level measuring system, including under
State step：
(1) light of probe source output is divided into two-way after amplifying, and a road is received by a photoelectric detector as reference light
After obtain first signal of telecommunication, another road as detect light；
(2) described detection light is divided into N road by 1 × N optical branching device, and respectively enters each sensing branch road；
(3) each sensing branch road detection light after liquid level sensor, reflected light again through optical circulator by light electrical resistivity survey
Survey after device receives and obtain second signal of telecommunication；
(4) described first signal of telecommunication and described second signal of telecommunication are carried out after related operation, obtain the sensing of every branch road
The positional information of point and liquid level information；And whether fracture event is occurred by the optical fiber that the positional information of sensing point judges this branch road
Barrier.
Further, described reference light is 10%, and described detection light is 90%.
Further, in step (4), according to formulaCarry out described related fortune
Calculate；Wherein, x (t) is reference optical signal (the time dependent sequence of intensity), and x (t- τ) is that (intensity is in time for detection optical signal
The sequence of change), Rx(τ) be calculate after the correlation curve that draws.
By the contemplated above technical scheme of the present invention, compared with prior art, have the advantages that：
(1) present invention is demodulated using based on the related algorithm of chaos light source, the correlation being drawn by computing cross-correlation
In curve, contain the positional information of sensing point simultaneously and detect intensity information, be capable of sensing parameter and sensing point position
Demodulate while putting, therefore can carry out sensing while multiple spot.
(2) when there being breakpoint to occur in optical fiber link, occur in correlation curve one corresponding to breakpoint location related
Peak, therefore can carry out real-time monitoring and positioning to the breakpoint occurring in optical fiber, it is random that the chaos light source due to adopting has light intensity
The characteristic rising and falling, positioning precision may be up to Centimeter Level.
Brief description
Fig. 1 is the probe source schematic diagram with ring cavity feedback of the embodiment of the present invention 1.
Fig. 2 is the liquid level sensor schematic diagram of the single mode-centreless-single-mode fiber structure of the embodiment of the present invention 1.
Fig. 3 is the detection system schematic diagram of the embodiment of the present invention 1.
In figure, 1 is semiconductor optical amplifier, and 2 is optoisolator, and 3 is 80：20 fiber couplers, 4 is the first single-mode optics
Fibre, 5 is coreless fiber, and 6 is the second single-mode fiber, and 7 is optical fiber total reflective mirror, and 8 is probe source, and 9 is erbium-doped fiber amplifier, 10
For 90：10 fiber couplers, 11 is optical circulator, and 12 is 1 × N optical branching device, and 13 is liquid level sensor, and 14 is fiber delay time
Line, 15 is photodetector, and 16 is data acquisition process equipment.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The technical problem to be solved is to provide a kind of Optical liquid level measurement system, overcomes traditional fiber liquid level to pass
Sensing system measurement range is little, can only carry out single-point level gauging, and is difficult to measuring system is carried out with malfunction monitoring and positioning
Shortcoming.
The invention provides a kind of Optical liquid level measurement system, this Optical liquid level measurement system is using related algorithm as solution
Tune method, can be demodulated to liquid level information and positional information simultaneously, in addition when breaking down in optical fiber sensing system, also may be used
To demodulate out by related algorithm.
Optical liquid level measurement system includes：Probe source 8, erbium-doped fiber amplifier 9,90：10 fiber couplers 10, the ring of light
Shape device 11,1 × N optical branching device 12, liquid level sensor 13, fiber delay line 14, photodetector 15 data acquisition process set
Standby 16.Wherein, the outfan of probe source 8 is connected with erbium-doped fiber amplifier 9 input, the output of erbium-doped fiber amplifier 9
End and 90:The input of 10 fiber couplers 10 connects, and 90：The of 90% outfan of 10 fiber couplers 10 and circulator 11
Single port connects, and the second port of circulator 11 is connected with the input port of 1 × N optical branching device 12,1 × N optical branching device 12
Each output port is connected with the first port of the fiber delay line 14 of different length, the second port of fiber delay line 14 and liquid
Level sensor 13 is connected, and the 3rd port of optical circulator 11 is connected with the input of photodetector 15, and 90：10 fiber couplers
10 10% outfan is directly connected with the input of photodetector 15, at the outfan of photodetector 15 and data acquisition
Reason equipment 16 is connected.
Probe source 8 includes：Semiconductor optical amplifier 1, optoisolator 2 and 80：20 fiber couplers 3；Semiconductor light is put
The outfan of big device 1 connects the input of optoisolator 2, and the outfan of optoisolator 2 connects 80：20 fiber couplers 3 defeated
Enter to hold, 80：The input of 20% outfan connection semiconductor optical amplifier 1 of 20 fiber couplers 3, formation ring cavity structure, 80：
The then output as ring cavity light source of the outfan of the 80% of 20 fiber couplers 3.
Liquid level sensor 13 includes：First single-mode fiber, coreless fiber, the second single-mode fiber and optical fiber total reflective mirror；Centreless
The two ends of optical fiber are connected with the first single-mode fiber and the second single-mode fiber respectively, and the other end connection optical fiber of the second single-mode fiber is complete
Anti- mirror.
Data acquisition process equipment can be gathered in real time, processed and be shown it is also possible to use using data collecting card
Data storage is got off by oscillograph, then carries out processed offline with computer again.
With reference to embodiments 1 offer can real time fail monitoring multi-channel optical fibre liquid level measuring system, be expanded on further
The present invention：Multi-channel optical fibre liquid level measuring system structure such as Fig. 3 of the embodiment of the present invention 1, puts including probe source 8, Er-doped fiber
Big device 9,90：10 fiber couplers 10, optical circulator 11,1 × N optical branching device 12, liquid level sensor 13, fiber delay line 14,
Photodetector 15 data acquiring and processing device 16.The outfan of probe source 8 is connected with the input of erbium-doped fiber amplifier 9
Connect, the outfan of erbium-doped fiber amplifier 9 and 90：The input of 10 fiber couplers 10 connects, and 90：10 fiber couplers 10
90% outfan is connected with optical circulator 11 first port, optical circulator 11 second port and 1 × N optical branching device 12 input port
Connect, each output port of 1 × N optical branching device 12 is connected with the first port of the fiber delay line 14 of different length, fiber delay time
The second port of line 14 is connected with liquid level sensor 13, and circulator 11 the 3rd port is connected with photodetector 15 input, and 90：
10% outfan of 10 fiber couplers 10 is directly connected with photodetector 15 input, the outfan of photodetector 15 with
Data acquisition process equipment 16 is connected.Probe source 8 structure such as Fig. 1 of the embodiment of the present invention 1, including semiconductor optical amplifier 1,
Optoisolator 2 and 80：20 fiber couplers 3；The outfan of semiconductor optical amplifier 1 connects the input of optoisolator 2, light
The outfan of isolator 2 connects 80：The input of 20 fiber couplers 3,80：20% outfan of 20 fiber couplers 3 connects
The input of semiconductor optical amplifier 1, forms ring cavity structure, the 80% outfan then output as light source.The present invention is implemented
Liquid level sensor 13 structure such as Fig. 2 of example 1 is complete including the first single-mode fiber 4, coreless fiber 5, the second single-mode fiber 6 and optical fiber
Anti- mirror 7.The two ends of coreless fiber 5 are connected with the first single-mode fiber 4 and the second single-mode fiber 6 respectively, the second single-mode fiber 6 another
One end connects optical fiber total reflective mirror 7.
With reference to embodiment 1 to can the operation principle of multi-channel optical fibre liquid level measuring system of real time fail monitoring explain
State.
In probe source 8, the output light of semiconductor optical amplifier 1 is through optoisolator 2 it is ensured that light passes in ring cavity
Defeated unipolarity.This output light is by 80：It is 80 that 20 fiber couplers 3 are divided into strength ratio：20 two parts, wherein 20% light exists
After circulating in ring cavity, re-enter in semiconductor optical amplifier 1 as feedback, the 80% light then output as ring cavity light source
Light.The disturbance being brought due to partly light feedback, output light presents dynamic instability characteristic, i.e. light intensity random fluctuation, for continuous
Nonperiodic signal.
In liquid level sensor 13, because the first single-mode fiber 4 and the second single-mode fiber 6 are straight with the fibre core of coreless fiber 5
Footpath mismatches, and can excite cladding mode, coreless fiber 5 is partially immersed in testing liquid in coreless fiber 5, when liquid level occurs
During change, the length that coreless fiber 5 is submerged changes, and the leakage of cladding mode in coreless fiber 5 also can change, and affects it
Transmission light intensity；The length of coreless fiber 5 is level sensing scope, up to more than ten centimetres.Optical fiber total reflective mirror 7 then will be by optical fiber
The detection light of micro structure reflects back, and is easy to further receive and process.Therefore when the liquid level of sensing point changes, should
The detection light reflex strength of branch road changes.
The output light of probe source 8 through erbium-doped fiber amplifier 9 amplification after, by 90：10 fiber couplers 10 are divided into by force
Degree ratio is 90：10 two parts, wherein 10% light is directly received by photodetector 15 as reference light.90% light is then made
For detecting light, after optical circulator 11, N road is divided into by 1 × N optical branching device 12, enters each sensing branch road.Each senses branch road
End be connected to liquid level sensor 13, the change of liquid level can affect to detect light intensity, detects light through liquid level sensor 13
Afterwards, its reflected light is received by photodetector 15 through optical circulator 11 again.Reference light and detection light are respectively by photodetector
15 are converted into the signal of telecommunication, input data acquiring and processing device 16, and after related operation, the correlation curve obtaining can reflect simultaneously
The positional information of sensing point and liquid level information.Every branch road is connected to the fiber delay line 14 of different length, the therefore position of sensing point
Put different, different branch roads can be distinguished by the positional information of sensing point；When fracture in the optical fiber of a certain branch road,
The positional information of breakpoint also can be reflected on correlation curve, therefore can easily carry out the health monitoring of sensing network.
The ultimate principle of related operation is：The output light detecting light is continuous nonperiodic signal, has wideband spectral property, its
Auto-correlation function has single, sharp peak, similar impulse function (delta-function).Signal x (t) and its time shift copy x (t- τ)
The general type of correlation function：Correlation function can embody delay inequality τ between two signals
And the intensity of signal.
In the present invention, the output light of probe source 8 is divided into reference signal and detectable signal two-way, reference signal directly quilt
Photodetector 15 receives, and is equivalent to signal x (t) of no time shift.Detectable signal then enters in multiple branch circuit level sensing network, warp
Pass back after the optical fiber total reflective mirror 7 of liquid level sensor 13 end or breakpoints of optical fiber reflection.Because each branch road is connected to the light of different length
Fine delay line 14, the time that detection light transmits in every branch road is different, and therefore detectable signal compares reference signal, is a series of
There is signal x (the t- τ of identical time domain waveform and different delay with reference signal1), x (t- τ2), x (t- τ3) ... ... superposition,
The position of relevant peaks, each sensing point pair after therefore carrying out related operation, is determined due to detecting the time delay between light and reference light
The position of the relevant peaks answered is also different, will not be overlapping, multiple relevant peaks in correlation curve, with a pair of each branch road 1
Should, the position of relevant peaks quantitatively reflects the time delay that each branch road detectable signal is relative to reference signal.By each tributary signal
Time delay is scaled distance according to the light velocity in optical fiber it is possible to determine the position of each branch road sensing point.When the liquid level of sensing point is sent out
During changing, the detection light intensity of this branch road changes, and the intensity of corresponding relevant peaks also occurs respective change, special by observation
Determine the liquid level that relevant peaks just can demodulate specific sensing point.The principle of malfunction monitoring：Malfunction monitoring actually with sensing
Process is to carry out simultaneously.Specifically monitoring method is：After related operation has been done with reference light to detection light, under normal circumstances (i.e.
Breakpoints of optical fiber is not had to occur), correlation curve has the relevant peaks of N number of non-overlapping copies, corresponds with N number of sensing point；If
A certain bar branch road occurs in that breakpoints of optical fiber, then the original relevant peaks of this branch road will disappear, and at the corresponding position of breakpoint
Arise that new relevant peaks, thus can know which bar branch road occurs in that breakpoint, and the tool of breakpoint simultaneously
Body position.Because the relevant peaks of chaos light source are very narrow, therefore resolution is higher, can reach Centimeter Level.This malfunction monitoring excellent
Point is：(1) operation it is not necessary to extra can be monitored with real time fail；(2) positioning precision is high.The present invention has advantages below：
Level gauging scope is larger it is achieved that multi-way level senses and have real time fail monitoring and the positioning work(of liquid level sensor system
Energy.
It should be noted last that, above specific embodiment only in order to technical scheme to be described and unrestricted,
Although being described in detail to the present invention with reference to preferred embodiment, it will be understood by those within the art that, can be right
Technical scheme is modified or equivalent, and without deviating from the spirit and scope of technical solution of the present invention, it is equal
Should cover in the middle of scope of the presently claimed invention.
Claims (9)
1. a kind of can real time fail monitoring multi-channel optical fibre liquid level measuring system it is characterised in that include：Ring cavity type probe source
(8), erbium-doped fiber amplifier (9), the first fiber coupler (10), optical circulator (11), 1 × N optical branching device (12), liquid level pass
Sensor (13) and photodetector (15)；
The input of described erbium-doped fiber amplifier (9) is connected with the outfan of described ring cavity type probe source (8), and described first
The input of fiber coupler (10) is connected with the outfan of described erbium-doped fiber amplifier (9),
The first port of described circulator (11) is connected with the first outfan of described first fiber coupler (10), described annular
The second port of device (11) is connected with the input port of described 1 × N optical branching device (12), and 1 × N optical branching device (12) has multiple
Output port, is connected with the first port of the described fiber delay line (14) of multiple different lengths respectively, described fiber delay line
(14) second port is connected with liquid level sensor (13)；
The first input end of described photodetector (15) is connected with the 3rd port of described optical circulator (11), described smooth electrical resistivity survey
The second input surveying device (15) is connected with the second outfan of described first fiber coupler (10)；Described data acquisition process
The input of equipment (16) is connected with the outfan of described photodetector (15).
2. multi-channel optical fibre liquid level measuring system as claimed in claim 1 is it is characterised in that described first fiber coupler (10)
For 90：10 fiber coupler, the optical signal of the first outfan output 90% of described first fiber coupler (10), described the
The optical signal of the second outfan output 10% of one fiber coupler (10).
3. multi-channel optical fibre liquid level measuring system as claimed in claim 1 or 2 is it is characterised in that described ring cavity type probe source
(8) include：Semiconductor optical amplifier (1), optoisolator (2) and the second fiber coupler (3)；
The outfan of described semiconductor optical amplifier (1) connects the input of described optoisolator (2), described optoisolator (2)
Outfan connect the input of described second fiber coupler (3), the first outfan of described second fiber coupler (3) is even
Connect the input of semiconductor optical amplifier (1), form ring cavity structure, the second outfan then conduct of the second fiber coupler (3)
The output of ring cavity light source.
4. multi-channel optical fibre liquid level measuring system as claimed in claim 3 is it is characterised in that described second fiber coupler (3)
For 80：20 fiber coupler；The optical signal of the first outfan output 20% of described second fiber coupler (3)；Described
The optical signal of the second outfan output 80% of two fiber couplers (3).
5. the multi-channel optical fibre liquid level measuring system as described in any one of claim 1-4 is it is characterised in that described liquid level sensor
(13) include：First single-mode fiber (4), coreless fiber (5), the second single-mode fiber (6) and optical fiber total reflective mirror (7)；
The two ends of described coreless fiber (5) one end and described second single-mode fiber (6) with described first single-mode fiber (4) respectively
One end connect, the other end of described second single-mode fiber (6) connects described optical fiber total reflective mirror (7), described first single-mode fiber
(4) the other end connects the second port of fiber delay line (14)；
Described coreless fiber (5) is partially immersed in testing liquid, and when liquid level changes, described coreless fiber (5) is immersed
Length not also changes therewith, and the leakage of cladding mode in described coreless fiber (5) also can change, and affects its transmission light
By force.
6. multi-channel optical fibre liquid level measuring system as claimed in claim 5 it is characterised in that described first single-mode fiber (4) with
The core diameter of described coreless fiber (5) mismatches, and described second single-mode fiber (6) is straight with the fibre core of described coreless fiber (5)
Footpath mismatches.
7. a kind of fault monitoring method based on the multi-channel optical fibre liquid level measuring system described in claim 1 is it is characterised in that wrap
Include following step：
(1) light of probe source output is divided into two-way after amplifying, and a road is obtained after being received by a photoelectric detector as reference light
Obtain first signal of telecommunication, another road is as detection light；
(2) described detection light is divided into N road by 1 × N optical branching device, and respectively enters each sensing branch road；
(3) each sensing branch road detection light after liquid level sensor, reflected light again through optical circulator by photodetector
Second signal of telecommunication is obtained after reception；
(4) described first signal of telecommunication and described second signal of telecommunication are carried out after related operation, obtain the sensing point of every branch road
Positional information and liquid level information；And whether fracture defect is occurred by the optical fiber that the positional information of sensing point judges this branch road.
8. it is characterised in that described reference light is 10%, described detection light is fault monitoring method as claimed in claim 7
90%.
9. fault monitoring method as claimed in claim 7 is it is characterised in that in step (4), according to formulaCarry out described related operation；Wherein, x (t) is reference optical signal, and x (t- τ) is to detect light
Signal, Rx(τ) be calculate after the correlation curve that draws.
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| CN107101697A (en) * | 2017-05-02 | 2017-08-29 | 太原理工大学 | A kind of device of quasi-distributed optical fiber liquid level sensor and its method for measuring liquid level |
| CN107389154A (en) * | 2017-08-09 | 2017-11-24 | 武汉隽龙科技股份有限公司 | The continuous liquid level sensing device of hollow optic fibre and measuring method based on OFDR |
| CN108759982A (en) * | 2018-05-21 | 2018-11-06 | 太原理工大学 | A kind of adjustable optical fiber liquid level measuring device of precision based on optical chaos and method |
| CN109238401A (en) * | 2018-09-14 | 2019-01-18 | 杭州热博科技有限公司 | Liquid level detection device and method |
| CN109974814A (en) * | 2019-04-12 | 2019-07-05 | 重庆理工大学 | Michelson liquid level sensor and measurement method are responded based on multiple-mode interfence low temperature |
| CN110260947A (en) * | 2019-07-30 | 2019-09-20 | 南昌航空大学 | A kind of fibre optic liquid level sensor and method for sensing |
| CN110530466A (en) * | 2019-09-26 | 2019-12-03 | 重庆理工大学 | Based on the cascade intensity modulation type level sensing detection method of double coreless fibers |
| CN113098595A (en) * | 2021-03-12 | 2021-07-09 | 华中科技大学 | Method, system and device for measuring group delay of few-mode optical fiber differential mode |
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