CN109406103A - A kind of optical cable non-destructive tests and current sensor device based on white light interference - Google Patents
A kind of optical cable non-destructive tests and current sensor device based on white light interference Download PDFInfo
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- CN109406103A CN109406103A CN201811465175.4A CN201811465175A CN109406103A CN 109406103 A CN109406103 A CN 109406103A CN 201811465175 A CN201811465175 A CN 201811465175A CN 109406103 A CN109406103 A CN 109406103A
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- Prior art keywords
- fiber
- interference
- oscillograph
- change
- optical fiber
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/088—Testing mechanical properties of optical fibres; Mechanical features associated with the optical testing of optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
- G01M11/331—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by using interferometer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Abstract
The invention discloses a kind of optical cable non-destructive tests and current sensor device based on white light interference, by wideband light source, optoisolator, fiber coupler, FC optical fiber connector, fiber interferometer, photodetector, amplifier, oscillograph, metal bar, power supply and load composition.Optical Fiber Winding fiber interferometer coated with magnetic fluid is packed into glass bushing, metal bar is placed in interference ring, the light that light source issues is transferred to optoisolator by optical fiber and enters coupler, be divided into two column light waves by it is suitable, counterclockwise propagate through connector, lead to the optical fiber generation interference for being wrapped in interference ring, signal is output to oscillograph by detector, observes detector and oscillograph detects optical cable degree of impairment；Change load to change the electric current in metal bar, the arrangement of interference ring surrounding magnetic field and magnetic fluid is caused to change, the effective refractive index of fiber optic interferometric ring surface and interference fringe is caused to change, sensory current variation is read by oscillograph.
Description
The invention belongs to optical cable detection technique fields, and in particular to a kind of optical cable non-destructive tests and electricity based on white light interference
Spread induction device.
Background technique
The creation and application of optical fiber cable are the big heroic undertakings in human development history, in past 40 years, China's light
Fine optical cable flourishes, but the detection of optical cable and identification problem are also more important therewith.White light interference is using noncoherent
Wideband light source, although coherence length is very short, its advantages are that have an apparent zero order interference fringe, the position of this striped
Setting corresponding is exactly zero optical path difference position, provides the reference point of measurement.Light source passes through optical fiber Sagnac under lower state
After interferometer, two column light waves of formation are propagated in same root light in different directions, are not generated optical path difference, be may be implemented
Measurement to optical cable.Photodetector is the photoelectric device that can convert optical signal into electric signal, its working principle is to be based on
Photoelectric effect, the function that can be shown and be controlled using this characteristic, photodetector can be used to replace human eye, and have
Have that spectral response range is wide, high sensitivity, the good feature of stability has been widely used.Due to needing stable light source true
It is accurate to protect detection, introducing optoisolator prevents the light being reflected back toward from impacting to light source, keeps testing result more acurrate, and use
It is convenient, improve light wave transmissions efficiency.Since optical material has electrical characteristics, i.e. optical fibre refractivity by electromagnetic field effects, with
The variation of electric current and change accordingly, recycle fibre coherence technique to detect optical cable, have structure simple, small in size etc.
Advantage has very big application prospect in sensory field.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the invention to be interfered with optical fiber Sagnac for primary structure, with white
Based on the interference of light and current sense and the advantages of optoisolator, damage check is carried out to optical cable.
The invention is realized by the following technical scheme: a kind of optical cable non-destructive tests and current sense dress based on white light interference
It sets, by wideband light source (1), optoisolator (2), fiber coupler (3), FC optical fiber connector (4), fiber interferometer (5), photoelectricity
Detector (6), amplifier (7), oscillograph (8), metal bar (9), power supply (10) and load (11) composition；It is characterized by: light
Fine interference ring (5) is packed into glass bushing (12), and is coated with magnetic fluid (13) on optical fiber, and it is dry that metal bar (9) is placed in optical fiber
It relates in ring (5), the light that wideband light source (1) issues is transferred to optoisolator (2) by optical fiber and enters fiber coupler (3), afterwards quilt
Two column light waves being divided into clockwise and counterclockwise are propagated through FC optical fiber connector (4) respectively, by being wrapped in fiber optic interferometric
The optical fiber of ring (5), two column light waves generate interference on photodetector (6) surface, and interference signal is converted to electricity by photodetector
Signal passes through again is shown to oscillograph (8) for waveform after amplifier (7), if the optical cable on fiber interferometer (5) damages,
Then interference fringe changes, then the interference signal of photodetector (6) changes, the signal on corresponding oscillograph (8)
Also it will change；When the electric current in metal bar (9) is changed by changing load (11), fiber interferometer (5) surrounding magnetic
Field environment changes, and the arrangement of magnetic fluid (13) changes, so as to cause the effective refractive index on fiber interferometer (5) surface
It changes, interference fringe is caused to change, can be changed by oscillograph (8) reading with sensory current.Solves traditional light
Optical cable is caused to damage in cable detection, reduces the cost of fiber optic communication, network management maintenance and maintenance.
The working principle of the invention is: the interference pattern based on the interference of optical fiber Sagnac, and the light issued from light source passes through
Two-beam clockwise and anticlockwise is divided by coupler after optoisolator, coupler is finally again passed by and reaches optical detector.
It is located at the obtained light intensity in surface of PD detector are as follows:
Wherein:It is the complex amplitude that PD detects electric field strength；α is coupling
Device added losses define α=total Output optical power/total input optical power；k1、k2For real constant, (optical path clockwise, counterclockwise is passed
Broadcast loss factor)；τ is the time delay of optical path clockwise, counterclockwise.
It usually can approximately think that the loss of optical path optical fiber clockwise and anticlockwise is close, i.e. k1=k2=k, then it is above-mentioned
Formula can abbreviation are as follows:
WhereinIn formula, n0For the refractive index of fiber cores；ΔS1、ΔS2
Respectively indicate the change in optical path length for being influenced and occurring by external carbuncle from the two column light beams that coupler comes out.
Light propagates passed by light path S in a fiber are as follows: S=n0L.When deformation occurs and causes under external influence for optical fiber
Light path change are as follows:
Δ S=n0ΔL+LΔn0
Wherein Δ L is the change of fiber lengths, Δ n0For the variation of optical fibre refractivity.The change of fiber lengths are as follows:
AL=L ε
ε is the strain value of optical fiber in formula.
So zero order fringe has most in the center of interference fringe in the case that optical cable does not receive extraneous stress effect
Big amplitude corresponds to optical path clockwise and optical path phase counterclockwise etc..When being led to change in optical path length by extraneous stress effect,
The position of white light interference center striped will move.
Detailed description of the invention
Fig. 1 is a kind of optical cable non-destructive tests and current sensor device structural schematic diagram based on white light interference.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing.
Referring to Fig. 1, a kind of optical cable non-destructive tests and current sensor device based on white light interference, by wideband light source (1), light
Isolator (2), fiber coupler (3), FC optical fiber connector (4), fiber interferometer (5), photodetector (6), amplifier
(7), oscillograph (8), metal bar (9), power supply (10) and load (11) composition；It is characterized by: fiber interferometer (5) is packed into
Glass bushing (12), and magnetic fluid (13) are coated on optical fiber, metal bar (9) is placed in fiber interferometer (5), wideband light source
(1) issue light by optical fiber be transferred to optoisolator (2) enter fiber coupler (3), after be divided into clockwise and anticlockwise
The two column light waves in direction are propagated through FC optical fiber connector (4) respectively, by being wrapped in the optical fiber of fiber interferometer (5), two column light
Wave generates interference on photodetector (6) surface, and interference signal is converted to electric signal by photodetector and passes through amplifier (7) again
Waveform is shown to oscillograph (8) afterwards, if the optical cable on fiber interferometer (5) damages, interference fringe changes,
Then the interference signal of photodetector (6) changes, and the signal on corresponding oscillograph (8) will also change；Work as metal
When electric current in stick (9) is changed by changing load (11), fiber interferometer (5) ambient magnetic field environment changes, magnetic current
The arrangement of body (13) changes, and the effective refractive index so as to cause fiber interferometer (5) surface changes, and causes to interfere item
Line changes, and can be changed by oscillograph (8) reading with sensory current.It solves and optical cable is caused to damage in conventional cable detection
Wound reduces the cost of fiber optic communication, network management maintenance and maintenance.
The working principle of the invention is: the interference pattern based on the interference of optical fiber Sagnac, and the light issued from light source passes through
Two-beam clockwise and anticlockwise is divided by coupler after optoisolator, coupler is finally again passed by and reaches optical detector.
It is located at the obtained light intensity in surface of PD detector are as follows:
Wherein:It is the complex amplitude that PD detects electric field strength；α is coupling
Device added losses define α=total Output optical power/total input optical power；k1、k2For real constant, (optical path clockwise, counterclockwise is passed
Broadcast loss factor)；τ is the time delay of optical path clockwise, counterclockwise.
It usually can approximately think that the loss of optical path optical fiber clockwise and anticlockwise is close, i.e. k1=k2=k, then it is above-mentioned
Formula can abbreviation are as follows:
WhereinIn formula, n0For the refractive index of fiber cores；ΔS1、ΔS2
Respectively indicate the change in optical path length for being influenced and occurring by external carbuncle from the two column light beams that coupler comes out.
Light propagates passed by light path S in a fiber are as follows: S=n0L.When deformation occurs and causes under external influence for optical fiber
Light path change are as follows:
Δ S=n0ΔL+LΔn0
Wherein Δ L is the change of fiber lengths, Δ n0For the variation of optical fibre refractivity.The change of fiber lengths are as follows:
Δ L=L ε
ε is the strain value of optical fiber in formula.
So zero order fringe has most in the center of interference fringe in the case that optical cable does not receive extraneous stress effect
Big amplitude corresponds to optical path clockwise and optical path phase counterclockwise etc..When being led to change in optical path length by extraneous stress effect,
The position of white light interference center striped will move.
The beneficial effects of the present invention are: being interfered with optical fiber Sagnac for primary structure, with white light in design of the invention
Based on interference and current sense and the advantages of optoisolator, lossless decomposition is carried out to optical cable.With very strong innovative and
Practical value has good application prospect.
Claims (1)
1. a kind of optical cable non-destructive tests and current sensor device based on white light interference, by wideband light source (1), optoisolator (2),
Fiber coupler (3), FC optical fiber connector (4), fiber interferometer (5), photodetector (6), amplifier (7), oscillograph
(8), metal bar (9), power supply (10) and load (11) composition；It is characterized by: fiber interferometer (5) is packed into glass bushing
(12), magnetic fluid (13) and on optical fiber are coated with, metal bar (9) is placed in fiber interferometer (5), and wideband light source (1) issues
Light optoisolator (2) are transferred into fiber coupler (3) by optical fiber, after be divided into clockwise and counterclockwise two
Column light wave is propagated through FC optical fiber connector (4) respectively, and by being wrapped in the optical fiber of fiber interferometer (5), two column light waves are in photoelectricity
Detector (6) surface generates interference, and interference signal is converted to by photodetector (6) will after electric signal passes through amplifier (7) again
Waveform is shown to oscillograph (8), if the optical cable on fiber interferometer (5) damages, interference fringe changes, then light
The interference signal of electric explorer (6) changes, and the signal on corresponding oscillograph (8) will also change；When metal bar (9)
In electric current by change load (11) change when, fiber interferometer (5) ambient magnetic field environment changes, magnetic fluid (13)
Arrangement change, the effective refractive index so as to cause fiber interferometer (5) surface changes, and leads to interference fringe
Variation can be changed by oscillograph (8) reading with sensory current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811465175.4A CN109406103A (en) | 2018-12-03 | 2018-12-03 | A kind of optical cable non-destructive tests and current sensor device based on white light interference |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811465175.4A CN109406103A (en) | 2018-12-03 | 2018-12-03 | A kind of optical cable non-destructive tests and current sensor device based on white light interference |
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| CN109406103A true CN109406103A (en) | 2019-03-01 |
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| CN201811465175.4A Pending CN109406103A (en) | 2018-12-03 | 2018-12-03 | A kind of optical cable non-destructive tests and current sensor device based on white light interference |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412119A (en) * | 2019-05-31 | 2019-11-05 | 中国计量大学 | A kind of low frequency Magnetic Flux Leakage Inspecting fault detection system based on white light interference |
| CN113324741A (en) * | 2021-07-30 | 2021-08-31 | 武汉光谷航天三江激光产业技术研究院有限公司 | System and method for evaluating large mode field optical fiber core refractive index fluctuation |
-
2018
- 2018-12-03 CN CN201811465175.4A patent/CN109406103A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412119A (en) * | 2019-05-31 | 2019-11-05 | 中国计量大学 | A kind of low frequency Magnetic Flux Leakage Inspecting fault detection system based on white light interference |
| CN113324741A (en) * | 2021-07-30 | 2021-08-31 | 武汉光谷航天三江激光产业技术研究院有限公司 | System and method for evaluating large mode field optical fiber core refractive index fluctuation |
| CN113324741B (en) * | 2021-07-30 | 2021-11-09 | 武汉光谷航天三江激光产业技术研究院有限公司 | System and method for evaluating large mode field optical fiber core refractive index fluctuation |
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