CN210180640U - Optical fiber internal anomaly detection system - Google Patents
Optical fiber internal anomaly detection system Download PDFInfo
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- CN210180640U CN210180640U CN201921434861.5U CN201921434861U CN210180640U CN 210180640 U CN210180640 U CN 210180640U CN 201921434861 U CN201921434861 U CN 201921434861U CN 210180640 U CN210180640 U CN 210180640U
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- optical fiber
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- signal light
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 65
- 238000001514 detection method Methods 0.000 title claims description 11
- 239000000835 fiber Substances 0.000 claims abstract description 55
- 238000005253 cladding Methods 0.000 claims abstract description 53
- 230000008878 coupling Effects 0.000 claims abstract description 29
- 238000010168 coupling process Methods 0.000 claims abstract description 29
- 238000005859 coupling reaction Methods 0.000 claims abstract description 29
- 230000005540 biological transmission Effects 0.000 claims abstract description 10
- 238000005286 illumination Methods 0.000 claims abstract description 8
- 230000005856 abnormality Effects 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model discloses an unusual detecting system in optic fibre, including optic fibre, coupling lens, reverse device, fluorescence cap and photoelectric detector of assembling, coupling lens sets up in the optical fiber coupling end to connect laser source and optic fibre through coupling lens, fluorescence cap sets up in the optic fibre illumination end, and the white light that fluorescence cap arouses is along optic fibre reverse transmission, reverse device setting of assembling is in the optical fiber coupling end for detect on assembling photoelectric detector with reverse transmission signal light. The utility model has the advantages that: the double-clad optical fiber is adopted, the fiber core is used for transmitting energy, the inner cladding transmits signals, the fiber core does not absorb signal light, and the signal light transmitted by the inner cladding is used for detecting whether the fiber core breaks down or not, so that the illumination safety is guaranteed, and the utilization rate of the optical fiber is improved.
Description
Technical Field
The utility model relates to a laser leaded light illumination and the flexible processing field of laser, concretely relates to unusual detecting system in optic fibre.
Background
In the optical fiber light guide illumination, the light flux of watt level needs to be coupled into the optical fiber, the optical fiber is an important means for realizing flexible transmission, and the optical fiber can avoid the limitation of refraction-reflection light path, so that the path is more flexible; but powerful transmission makes the energy density in the optical fiber cross-section very high, if the optic fibre defect or fracture arouse accidents such as burning easily, therefore the fault detection of optic fibre is very important, the utility model provides an unusual detecting means in the optic fibre solves this type of technical problem.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides an anomaly detection system in optic fibre rational in infrastructure.
The technical scheme of the utility model as follows:
the utility model provides an unusual detecting system in optic fibre, its characterized in that includes laser light source, coupling lens, optic fibre, fluorescence cap, reverse device, band pass filter and photoelectric detector that assembles, coupling lens sets up the coupling end at optic fibre, optic fibre passes through the external laser light source of coupling lens, fluorescence cap sets up the illumination end at optic fibre for reverse excitation signal light carries out reverse transmission with signal light along optic fibre, reverse device setting that assembles is in the coupling end of optic fibre for on assembling band pass filter with reverse transmission's signal light, detect through photoelectric detector.
The system for detecting the abnormality in the optical fiber is characterized in that the optical fiber adopts a step-index double-clad optical fiber and comprises a fiber core, a first cladding and a second cladding, wherein the fiber core is used for transmitting energy, the first cladding is used for transmitting signals, and the second cladding is used for limiting signal light to be transmitted in the first cladding.
The system for detecting the abnormality in the optical fiber is characterized in that the optical fiber adopts a step-index single-cladding optical fiber or a graded-index optical fiber and comprises a fiber core and a first cladding, wherein the fiber core is used for channel multiplexing and can transmit energy and signals, and the graded-index optical fiber has the largest central refractive index of the fiber core and is gradually reduced along the radial direction.
The system for detecting the abnormality in the optical fiber is characterized in that the reverse converging device adopts a reverse converging lens which is nested on the coupling lens.
The system for detecting the abnormality in the optical fiber is characterized in that the reverse convergence device is provided with an oblique wedge at the optical fiber coupling end, so that reverse transmission signal light is reflected to the photoelectric detector through the oblique wedge.
The system for detecting the abnormality in the optical fiber is characterized in that the refractive index of the second cladding is smaller than that of the first cladding, and the refractive index of the first cladding is smaller than that of the fiber core.
The utility model has the advantages that: the double-clad optical fiber is adopted, the fiber core is used for transmitting energy, the inner cladding transmits signals, the fiber core does not absorb signal light, and the signal light transmitted by the inner cladding is used for detecting whether the fiber core breaks down or not, so that the illumination safety is guaranteed, and the utilization rate of the optical fiber is improved.
Drawings
FIG. 1 is a schematic view of a total reflection type meridian reflection signal light of the present invention;
fig. 2 is a schematic diagram of an oblique ray spiral type reflected signal light of the present invention;
FIG. 3 is a schematic view of the wedge structure of the present invention;
in the figure: the optical fiber coupling device comprises a laser light source 1, a coupling lens 2, an optical fiber 3, a fiber core 31, a first cladding 32, a second cladding 33, a fluorescent cap 4, a reverse converging lens 5, a band-pass filter 6 and a photoelectric detector 7.
Detailed Description
The invention is further described with reference to the accompanying drawings.
As shown in fig. 1-3, an optical fiber internal abnormality detection system includes a laser light source 1, a coupling lens 2, an optical fiber 3, a fluorescent cap 4, a reverse converging device, a band-pass filter 6, and a photodetector 7.
The laser light source 1 is a blue laser light source with the wavelength of 450 nm; including but not limited to: semiconductor lasers, solid state lasers, gas lasers, fiber lasers, and the like.
The coupling lens 2 adopts an imaging optical lens or a lens group and a non-imaging optical free-form surface lens; a non-imaging optical free-form surface lens is preferably used for coupling the light emitted by the laser light source 1 for illumination into the fiber core of the optical fiber;
the optical fiber 3 is a novel optical fiber for channel multiplexing, and the optical fiber can adopt a step-index double-clad optical fiber, a step-index single-clad optical fiber or a graded-index optical fiber; the graded index optical fiber comprises a fiber core 31 and a first cladding 32, wherein the fiber core 31 can transmit energy and signals through channel multiplexing, and the refractive index of the graded index optical fiber is highest in the center and gradually decreases along the radial direction. The preferred double-clad fiber with step index of the present invention comprises a fiber core 31, a first cladding 32 (inner cladding) and a second cladding 33 (outer cladding), wherein the fiber core 31 is used for transmitting energy, the inner cladding is used for transmitting signals, the outer cladding is used for limiting signal light to be transmitted in the inner cladding, and the fiber core 31 satisfies that the fiber core does not absorb the signal light transmitted in the inner cladding; the fiber core 31 can also be used for transmitting signals, the inner cladding is used for transmitting energy, the outer cladding is used for limiting energy transmission light to be transmitted in the inner cladding, and the fiber core 31 meets the condition that the fiber core does not absorb the energy light transmitted in the inner cladding; wherein the inner cladding and the fiber core form a multimode waveguide, and the outer cladding and the inner cladding also form a multimode waveguide; the step-index double-clad fiber has an outer cladding smaller than the inner cladding, and an inner cladding smaller than the fiber core. The light transmitted by the inner cladding comprises two modes of meridional light full-emission transmission and oblique light spiral advancing.
1. Satisfies the condition that the incident angle is less than or equal to
The meridional rays of light can be transmitted by total reflection in the optical fiber,
；
2. satisfies the condition that the incident angle is less than or equal to
The oblique light rays of (a) may be helically transmitted in the optical fiber,
，
(ii) a Wherein 𝜑 is the angle between the oblique ray and the radial direction of the end face of the optical fiber, gamma is the angle between the oblique ray and the projection of the oblique ray on the section of the optical fiber, and n1And n2Is the refractive index of the core and the inner cladding, n0Is the refractive index of the outer cladding.
The fluorescent cap 4 is a device for converting blue light into white light, and the fluorescent cap itself has a property of bidirectional excitation, so that white signal light transmitted back in the reverse direction is transmitted to the coupling end in the reverse direction in the first cladding layer in a portion satisfying the aperture of the first cladding layer numerical value.
The reverse converging lens 5 is used for converging the white light which is transmitted back in the reverse direction to the filter 6, the reverse converging lens 5 does not influence a forward light path, can be nested on the coupling lens 2 when the intensity of the white light which is transmitted in the reverse direction is enough, and can also make an inner cladding layer and an outer cladding layer of an optical fiber end surface into an oblique-wedge type at the coupling end, and an oblique-wedge structure is added between the optical fiber end surface or the inner cladding layer and the outer cladding layer, and the oblique-wedge type is reflected to the photoelectric detector 7 for detection (such as the left end position shown in fig. 3.
The band-pass filter 6 is used for filtering the influence of the light collected by the convergent lens and the blue light of the coupling end, the photoelectric detector 7 is a photodetector for judging whether the optical fiber has a fault, and the damage of the optical fiber can not detect the white light or the white light is obviously reduced.
In the optical fiber internal anomaly detection system, light emitted by a laser light source 1 is coupled into a fiber core 31 of an optical fiber after passing through a coupling lens 2 and is transmitted through the optical fiber 3, a fluorescent cap 4 is used for converting blue light into white light, and the blue light is filtered through a filter 6 after being collected through a reverse converging lens, so that the influence of the blue light is eliminated, and finally whether the optical fiber breaks down or not is detected through a photoelectric detector 7.
Anomalies within the fiber optic fibers of the present system include, but are not limited to: breaking the optical fiber; optical fiber burn-in caused by hole burning, flaw and end surface pollution caused by internal defects of the optical fiber; quality degradation, etc.
Claims (6)
1. The system for detecting the abnormality in the optical fiber is characterized by comprising a laser light source (1), a coupling lens (2), an optical fiber (3), a fluorescent cap (4), a reverse convergence device, a filter plate (6) and a photoelectric detector (7), wherein the coupling lens (2) is arranged at the coupling end of the optical fiber (3), and the optical fiber (3) is externally connected with the laser light source (1) through the coupling lens (2); the fluorescent cap (4) is arranged at the illumination end of the optical fiber (3) and used for reversely exciting signal light and reversely transmitting the signal light along the optical fiber (3); the reverse converging device is arranged at the coupling end of the optical fiber (3) and used for converging the signal light transmitted reversely to the band-pass filter (6) and detecting the signal light through the photoelectric detector (7).
2. An in-fiber anomaly detection system according to claim 1, characterized in that said optical fiber (3) is a step-index double-clad fiber comprising a core (31), a first cladding (32) and a second cladding (33), wherein the core (31) is used for transmitting energy, the first cladding (32) is used for transmitting signals, and the second cladding (33) is used for confining signal light to be transmitted in the first cladding (32).
3. An in-fiber anomaly detection system according to claim 1, characterized in that said optical fiber (3) is a step-index single-clad fiber or a graded-index fiber, comprising a core (31) and a first cladding (32), wherein the core (31) is channel-multiplexed to transmit both energy and signals.
4. An optical fiber in-fiber abnormality detection system according to claim 1, characterized in that said reverse converging means employs a reverse converging lens (5), said reverse converging lens (5) being nested on the coupling lens (2).
5. The system for detecting the abnormality in the optical fiber according to claim 1, wherein the backward converging means is provided with a wedge at the coupling end of the optical fiber, so that the backward transmission signal light is reflected to the photodetector (7) through the wedge.
6. An in-fiber anomaly detection system according to claim 2, wherein said second cladding (33) has a refractive index lower than that of the first cladding (32), the refractive index of the first cladding (32) being lower than that of the core (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921434861.5U CN210180640U (en) | 2019-08-31 | 2019-08-31 | Optical fiber internal anomaly detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921434861.5U CN210180640U (en) | 2019-08-31 | 2019-08-31 | Optical fiber internal anomaly detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389018A (en) * | 2019-08-31 | 2019-10-29 | 浙江工业大学 | Abnormality detection system in a kind of optical fiber is fine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389018A (en) * | 2019-08-31 | 2019-10-29 | 浙江工业大学 | Abnormality detection system in a kind of optical fiber is fine |
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