CN103712780B - A kind of detection method of inside of optical fibre absorption characteristic and pick-up unit - Google Patents
A kind of detection method of inside of optical fibre absorption characteristic and pick-up unit Download PDFInfo
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- CN103712780B CN103712780B CN201310730491.0A CN201310730491A CN103712780B CN 103712780 B CN103712780 B CN 103712780B CN 201310730491 A CN201310730491 A CN 201310730491A CN 103712780 B CN103712780 B CN 103712780B
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Abstract
The invention provides a kind of detection method and pick-up unit of inside of optical fibre absorption characteristic, this detection method utilizes laser beam to propagate in a fiber, is absorbed and cause optical fiber local temperature to raise by optical fiber itself, thus cause optical fiber local physical property this effect that changes to carry out the absorption characteristic of detection fiber inside, the space distribution of inside of optical fibre absorption characteristic can be obtained, and then obtain the space distribution of inside of optical fibre defect.The present invention also provides a kind of pick-up unit of inside of optical fibre absorption characteristic.The present invention has the advantage such as high resolving power, high sensitivity.
Description
Technical field
The present invention relates to optic fibre characteristic detection technique field, specifically a kind of detection method of inside of optical fibre absorption characteristic and pick-up unit.
Background technology
Optical fiber technology application is very extensive, and from modern communication, to all kinds of sensing technology, again to new type light source etc., optical fiber is all absolutely necessary critical material.Particularly in recent years, along with the fast development of high power laser application, new requirement is proposed to the performance of optical fiber itself.
The absorption of inside of optical fibre is the key factor affecting beam propagation, absorbs less, and beam propagation distance is longer.In addition, inside of optical fibre can because of manufacturing, adulterating a variety of causes generation local defects such as uneven, these defects often exert an adverse impact to the beam propagation in optical fiber, such as, powerful laser beam often can be destroyed because these defects produce at inside of optical fibre the absorption of laser energy in Optical Fiber Transmission, affects the normal propagation of light beam; Further, as the optical fiber of gain medium in fiber laser, because these defects, in laser amplification procedure, also can produce destruction, thus cause laser instrument cisco unity malfunction.Therefore, it is possible to effectively detect these native defects of inside of optical fibre, it is very necessary for particularly can carrying out effectively detecting to the space distribution of these defects.
Existing detection is substantially all that the energy of the light beam measuring input optical fibre and the energy of light beam that exports from optical fiber are to obtain the loss of light beam through optical fiber.The loss recorded like this is the loss of optical fiber integrally, not only comprises the loss that the absorption of optical fiber to beam energy causes, the loss that the scattering also comprising inside of optical fibre causes, and cannot obtain inside of optical fibre absorption characteristic and defect space distribution.
Summary of the invention
The object of the present invention is to provide and a kind ofly there is high resolving power and high sensitivity and detection method and the pick-up unit of the inside of optical fibre absorption characteristic of inside of optical fibre absorption characteristic and defect space distribution can be obtained.
Technical scheme of the present invention is:
A detection method for inside of optical fibre absorption characteristic, comprises the following steps:
(1) modulate the light intensity of the pump beam that pump light source exports, and the pump beam through ovennodulation is coupled into tested optical fiber, pump beam is propagated in tested optical fiber;
(2) detecting light beam that probe source exports is focused on a certain region in tested optical fiber;
(3) photodetector is adopted to detect the detecting light beam from tested optical fiber outgoing, the light signal of detection is changed into electric signal by photodetector, input AC Testing of Feeble Signals device detects, and obtains the propagation characteristic of detecting light beam at the variable quantity through a certain region of tested optical fiber;
(4) according to the propagation characteristic of detecting light beam at the variable quantity through a certain region of tested optical fiber, obtain this region of tested optical fiber to the absorption characteristic of pump beam;
(5) change the focal zone of detecting light beam in tested optical fiber, repeat above-mentioned steps (3) and step (4), obtain the absorption characteristic of tested optical fiber regional to pump beam, obtain the space distribution of tested optical fiber absorbed inside characteristic.
The detection method of described inside of optical fibre absorption characteristic, in described step (3), from the detecting light beam of tested optical fiber outgoing via after detection light convergence apparatus, detection light filtering apparatus and spatial filter, then enters photodetector.
The detection method of described inside of optical fibre absorption characteristic, in described step (3), described interchange Testing of Feeble Signals device selects lock-in amplifier.
The detection method of described inside of optical fibre absorption characteristic, in described step (5), changes the focal zone of detecting light beam in tested optical fiber, realizes especially by following steps:
(1) detecting light beam, on optical fiber clamping gearshift, is then focused on a certain region of this section of optical fiber by wherein one section of fixed placement of tested optical fiber;
(2) by this section of optical fiber companion optical fiber clamping gearshift moving axially together along optical fiber, the relative position of detecting light beam focal zone on this section of optical fiber is changed;
(3) change the clamping position of optical fiber clamping gearshift in tested optical fiber, repeat above-mentioned steps.
A kind of pick-up unit of inside of optical fibre absorption characteristic, comprise the pump light source, probe source and the photodetector that are connected with tested optical fiber light path respectively, optic modulating device and optically coupled device is provided with successively between described pump light source and tested optical fiber, be provided with between described probe source and tested optical fiber and detect light first convergence apparatus, be provided with successively between described tested optical fiber and photodetector and detect light second convergence apparatus, detect light filtering apparatus and spatial filter; The output terminal of described photodetector is connected with the input end exchanging Testing of Feeble Signals device.
The pick-up unit of described inside of optical fibre absorption characteristic, also comprise for placing and the optical fiber clamping gearshift of mobile tested optical fiber, described optical fiber clamping gearshift is fixedly connected with tested optical fiber.
The pick-up unit of described inside of optical fibre absorption characteristic, is provided with light-dividing device between described optic modulating device and optically coupled device, and the reflected light path of described light-dividing device is provided with optical power detecting device.
The pick-up unit of described inside of optical fibre absorption characteristic, is provided with successively between described probe source and detection light first convergence apparatus and detects light shaping treating apparatus and detect angular adjusting gear.
The pick-up unit of described inside of optical fibre absorption characteristic, is provided with between described detection light filtering apparatus and spatial filter and detects light light-dividing device, and the reflected light path of described detection light light-dividing device is provided with detection of optical power sniffer.
The present invention utilizes laser beam to propagate in a fiber, is absorbed and cause optical fiber local temperature to raise by optical fiber itself, thus cause optical fiber local physical property this effect that changes to carry out the absorption characteristic of detection fiber inside, the space distribution of inside of optical fibre absorption characteristic can be obtained, and then obtaining the space distribution of inside of optical fibre defect, the present invention has the advantage such as high resolving power, high sensitivity.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention;
Fig. 2 is apparatus structure schematic diagram of the present invention.
Embodiment
As shown in Figure 1, the pumping laser light beam 100 that pump light source sends is coupled into tested optical fiber 6 and propagates wherein, because optical fiber itself is to the absorption of laser, the temperature of optical fiber all can be caused to raise in the region of pump beam process, thus the physical characteristics of optical fiber is changed, as thermal expansion, refraction index changing etc.Now, to be irradiated to after focusing on via detection light first convergence apparatus 11 with a branch of more weak detecting light beam 800 in tested optical fiber 6 and through tested optical fiber 6, the detecting light beam 800 incident concerning this bundle, tested optical fiber 6 is just equivalent to one " post lens ".The change of the Optical Fiber Physical characteristic caused by above-mentioned light absorption, the propagation characteristic through the detecting light beam 801 of tested optical fiber 6 also can correspondingly change, as produced newly-increased convergence or effect weakening.The size of this change is determined the size that pumping laser absorbs by optical fiber itself.Absorb larger, cause the change of detecting light beam propagation characteristic also larger, correspondingly, the signal that photodetector 17 detects is also larger.Within the scope of certain pump laser power, absorb with measuring-signal linear.By the detection to the change of this detecting light beam propagation characteristic, just can obtain optical fiber detecting light beam through region the absorption characteristic to pumping laser.
To the detection of the change of detecting light beam propagation characteristic, the detecting unit be made up of detection light second convergence apparatus 12, detection light filtering apparatus 13, spatial filter 16 and photodetector 17 can be adopted.Detecting light beam 801 through tested optical fiber 6 is collected by detection light second convergence apparatus 12, and filter the parasitic light except detection light by detection light filtering apparatus 13, detected by photodetector 17 after spatial filter 16, spatial filter 16 only allows part detection light beam 801 pass through again.Produce newly-increased convergence or effect weakening in detecting light beam 801, correspondingly can cause the change of the detection luminous energy by spatial filter 16.Because the variable quantity of detecting light beam propagation characteristic is often smaller, even be less than the noise fluctuations of detecting light beam itself, therefore general needs utilizes interchange Testing of Feeble Signals device to detect, conventional interchange Testing of Feeble Signals device has lock-in amplifier etc., when adopting lock-in amplifier to detect induced with laser detection Photothermal Signals, pumping laser light beam will be carried out to the reference signal frequency of frequency modulating signal as lock-in amplifier of intensity modulation, greatly can suppress the impact on measurement result such as noise and external environmental noise of detecting light beam itself like this, reach very high detection sensitivity, the frequency of modulation signal is unsuitable too high, can eliminate the thermophysical property of tested optical fiber own like this to the impact of testing result.
When sensing point moves relative to optical fiber direction, every bit on the optical fiber of process is all detected, just can obtain the space distribution of inside of optical fibre absorption characteristic.Because the core diameter of optical fiber itself is smaller, great majority are between several microns to hundreds of micron, and the spot size after generally focusing on is also in this scope, therefore, the space distribution of the absorption characteristic adopting the present invention's measurement to obtain only is having resolution along on the direction of optical fiber, and the size of resolution depends on the size of laser facula.The lateral cross section of optical fiber do not have resolution.
As shown in Figure 2, a kind of pick-up unit of inside of optical fibre absorption characteristic, include pump light source 1, optic modulating device 2, light-dividing device 3, optical power detecting device 4, optically coupled device 5, tested optical fiber 6, optical fiber clamping gearshift 7, probe source 8, detection light shaping treating apparatus 9, detection angular adjusting gear 10, detection light first convergence apparatus 11, detection light second convergence apparatus 12, detection light filtering apparatus 13, detection light light-dividing device 14, detection of optical power sniffer 15, spatial filter 16, photodetector 17 with exchange Testing of Feeble Signals device 18.
Optic modulating device 2 can adopt photomodulator or chopper, light-dividing device 3 and detection light light-dividing device 14 can adopt light splitting piece or Amici prism, optical power detecting device 4 and detection of optical power sniffer 15 can adopt power meter or power detector, optically coupled device 5 can adopt microcobjective, detection light shaping treating apparatus 9 can adopt beam expanding lens, detection angular adjusting gear 10 can adopt high reflection mirror, detection light first convergence apparatus 11 and detection light second convergence apparatus 12 can adopt condenser lens, detection light filtering apparatus 13 can adopt optical filter, exchange Testing of Feeble Signals device 18 and can adopt lock-in amplifier.
The pump beam sent by pump light source 1 light intensity after optic modulating device 2 is modulated, two bundles are divided into again through light-dividing device 3, wherein a branch ofly enter into optical power detecting device 4, for monitoring the power of the pump light inciding tested optical fiber 6 li, another bundle is coupled to inside tested optical fiber 6 through optically coupled device 5, and propagate in tested optical fiber 6, due to the absorption of tested optical fiber 6 pairs of pump energies, the rising of the temperature of tested optical fiber 6 can be caused, thus the physical characteristics of tested optical fiber 6 is changed.
The detecting light beam sent by probe source 8 is successively through detection light shaping treating apparatus 9, after detection angular adjusting gear 10, focus in tested optical fiber 6 by detection light first convergence apparatus 11, detecting light beam through tested optical fiber 6 is collected via detection light second convergence apparatus 12, the parasitic light of other wave band except detection light is filtered again through detection light filtering apparatus 13, detecting light beam through detection light filtering apparatus 13 is divided into two bundles by detecting light light-dividing device 14, wherein a branch ofly enter detection of optical power sniffer 15, for monitoring the power of detection light, another Shu Ze is detected by photodetector after spatial filter 17, detection Photothermal Signals is changed into electric signal by photodetector 17, input AC Testing of Feeble Signals device 18 detects, again through follow-up Data Analysis Services, obtain inside of optical fibre absorption characteristic and defect space distribution.
Tested optical fiber 6 one section of fixed placement wherein, on optical fiber clamping gearshift 7, can carry out scanning survey relative to exploring spot, thus obtains the space distribution of inside of optical fibre absorption characteristic.Due to the feature of optical fiber itself, when being placed on this section of optical fiber on optical fiber clamping gearshift 7 with this optical fiber clamping gearshift 7 displacement, can not having an impact to propagation light path, therefore not affect the process of scanning survey.
The above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (9)
1. a detection method for inside of optical fibre absorption characteristic, is characterized in that, comprises the following steps:
(1) modulate the light intensity of the pump beam that pump light source exports, and the pump beam through ovennodulation is coupled into tested optical fiber, pump beam is propagated in tested optical fiber;
(2) detecting light beam that probe source exports is focused on a certain region in tested optical fiber;
(3) photodetector is adopted to detect the detecting light beam from tested optical fiber outgoing, the light signal of detection is changed into electric signal by photodetector, input AC Testing of Feeble Signals device detects, and obtains the propagation characteristic of detecting light beam at the variable quantity through a certain region of tested optical fiber;
(4) according to the propagation characteristic of detecting light beam at the variable quantity through a certain region of tested optical fiber, obtain this region of tested optical fiber to the absorption characteristic of pump beam;
(5) change the focal zone of detecting light beam in tested optical fiber, repeat above-mentioned steps (3) and step (4), obtain the absorption characteristic of tested optical fiber regional to pump beam, obtain the space distribution of tested optical fiber absorbed inside characteristic.
2. the detection method of inside of optical fibre absorption characteristic according to claim 1, it is characterized in that, in described step (3), from the detecting light beam of tested optical fiber outgoing via after detection light convergence apparatus, detection light filtering apparatus and spatial filter, then enter photodetector.
3. the detection method of inside of optical fibre absorption characteristic according to claim 1, is characterized in that, in described step (3), described interchange Testing of Feeble Signals device selects lock-in amplifier.
4. the detection method of inside of optical fibre absorption characteristic according to claim 1, is characterized in that, in described step (5), changes the focal zone of detecting light beam in tested optical fiber, realizes especially by following steps:
(1) detecting light beam, on optical fiber clamping gearshift, is then focused on a certain region of this section of optical fiber by wherein one section of fixed placement of tested optical fiber;
(2) by this section of optical fiber companion optical fiber clamping gearshift moving axially together along optical fiber, the relative position of detecting light beam focal zone on this section of optical fiber is changed;
(3) change the clamping position of optical fiber clamping gearshift in tested optical fiber, repeat above-mentioned steps.
5. the pick-up unit of an inside of optical fibre absorption characteristic, it is characterized in that: comprise the pump light source, probe source and the photodetector that are connected with tested optical fiber light path respectively, optic modulating device and optically coupled device is provided with successively between described pump light source and tested optical fiber, be provided with between described probe source and tested optical fiber and detect light first convergence apparatus, be provided with successively between described tested optical fiber and photodetector and detect light second convergence apparatus, detect light filtering apparatus and spatial filter; The output terminal of described photodetector is connected with the input end exchanging Testing of Feeble Signals device.
6. the pick-up unit of inside of optical fibre absorption characteristic according to claim 5, is characterized in that: also comprise for placing and the optical fiber clamping gearshift of mobile tested optical fiber, described optical fiber clamping gearshift is fixedly connected with tested optical fiber.
7. the pick-up unit of inside of optical fibre absorption characteristic according to claim 5, is characterized in that: be provided with light-dividing device between described optic modulating device and optically coupled device, the reflected light path of described light-dividing device is provided with optical power detecting device.
8. the pick-up unit of inside of optical fibre absorption characteristic according to claim 5, is characterized in that: be provided with successively between described probe source and detection light first convergence apparatus and detect light shaping treating apparatus and detect angular adjusting gear.
9. the pick-up unit of inside of optical fibre absorption characteristic according to claim 5, it is characterized in that: be provided with between described detection light filtering apparatus and spatial filter and detect light light-dividing device, the reflected light path of described detection light light-dividing device is provided with detection of optical power sniffer.
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| CN105424602A (en) * | 2015-12-31 | 2016-03-23 | 合肥知常光电科技有限公司 | Variable-angle optical element surface absorption characteristic measuring device |
| CN105717127A (en) * | 2016-02-05 | 2016-06-29 | 中国工程物理研究院激光聚变研究中心 | Photo-thermal weak absorption testing device and method |
| JP7194883B2 (en) * | 2017-09-21 | 2022-12-23 | パナソニックＩｐマネジメント株式会社 | FAILURE DETECTION DEVICE, LASER PROCESSING SYSTEM AND FAILURE DETECTION METHOD |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197560A (en) * | 1995-09-15 | 1998-10-28 | Pllb伊莱乔尼卡公司 | System, method and device for monitoring a fiber optic cable |
| US7525658B1 (en) * | 2005-08-15 | 2009-04-28 | Electronic Design To Market, Inc. | System of correlating light measurements |
| CN203643135U (en) * | 2013-12-26 | 2014-06-11 | 合肥知常光电科技有限公司 | Detection device for optical fiber internal absorption characteristics |
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| JPS5596433A (en) * | 1979-01-17 | 1980-07-22 | Nippon Telegr & Teleph Corp <Ntt> | Observation of core of optical fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1197560A (en) * | 1995-09-15 | 1998-10-28 | Pllb伊莱乔尼卡公司 | System, method and device for monitoring a fiber optic cable |
| US7525658B1 (en) * | 2005-08-15 | 2009-04-28 | Electronic Design To Market, Inc. | System of correlating light measurements |
| CN203643135U (en) * | 2013-12-26 | 2014-06-11 | 合肥知常光电科技有限公司 | Detection device for optical fiber internal absorption characteristics |
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