CN104601224A - Device for quickly detecting and inhibiting optical discharge transmission in optical fiber - Google Patents
Device for quickly detecting and inhibiting optical discharge transmission in optical fiber Download PDFInfo
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- CN104601224A CN104601224A CN201510022748.6A CN201510022748A CN104601224A CN 104601224 A CN104601224 A CN 104601224A CN 201510022748 A CN201510022748 A CN 201510022748A CN 104601224 A CN104601224 A CN 104601224A
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Abstract
The invention relates to a device for quickly detecting and inhibiting optical discharge transmission in an optical fiber and an optical discharge transmission speed measuring system based on an integrating sphere. The device for quickly detecting and inhibiting the optical discharge transmission in the optical fiber comprises the integrating sphere, a visible light detector and a power supply control shutdown circuit, the integrating sphere is a hollow semi-sphere, and the inner wall is smooth and good for reflecting light so as to improve the detection precision and guarantee the timely and precise system power supply off. The optical discharge transmission speed measuring system based on the integrating sphere mainly comprises two suits of integrating sphere detection devices and a timing circuit, and the starting time and ending time of the optical discharge in the optical fiber with the special length are precisely judged to calculate the transmission speed thereof through the measurement of detectors in the integrating sphere. Compared with an existing optical discharge detection system, the device for quickly detecting and inhibiting the optical discharge transmission in the optical fiber is simple in structure, high in precision and precise in measurement.
Description
Technical field
The invention belongs to Fiber laser technology field, relate to a kind of quick detection and suppress the device that in optical fiber, optics electric discharge is transmitted.
Background technology
Optical fiber is the important component part of Modern Communication System and high-capacity optical fiber laser, along with the lifting of through-put power, require that the power that optical fiber can bear is also more and more higher, but this will reduce the reliability of fibre system greatly, very easily produce a series of unfavorable phenomenon to signal extraction, power stage, even optical fiber itself, wherein comparatively serious, can a class phenomenon of permanent damage be caused to be exactly fiber fuse to system or be called optics electric discharge (fiber fuse or optical discharge) phenomenon.Silica fiber can not absorb substantially to the light in its transmission window under normal circumstances, but at high temperature (about 1000K), due to material structure defect, the absorption of optical fiber to the light of transmission can increase sharply, this further increases again fiber optic temperature makes absorption stronger, finally bring out core material ionization, produce the phenomenon of similar plasma.The plasma produced has strong absorption to laser, and propagate to light source direction along fibre core with the speed of a few metre per second (m/s), the light that simultaneous is yellow or white, closedown light sources transmit stops, now can observe the aperture of a succession of similar bullet shape in the fibre core of light process, permanent damage is caused to optical fiber.Fiber fuse is be found at fiber optic communication field and study report the earliest, although the power transmitted in telecommunication optical fiber is general not high, because fibre core is smaller, power density is comparatively large, and the threshold power density maintaining fiber fuse transmission only needs a few MW/cm
2, general fiber laser is easy to reach, and be therefore a potential hidden danger to fibre system, once optics electric discharge occurs, if can not close light source in time, fibre system is likely totally disrupted.In high-capacity optical fiber laser system, because the power of transmission is higher, if it will be larger that optics electric discharge harm occurs.
For the Optical Maser System of all optical fibre structure, fiber output head, pump combiner and doping optical fusing point and the pumping position such as to come down in torrents is comparatively fragile, usually be also the place the most easily generated heat, so just very likely bring out optics electric discharge, therefore at it, rear Timeliness coverage occur and stop its propagation to have great importance concerning fibre system.
The method of the electric discharge of the optics in optical fiber is suppressed to mainly contain two large classes at present.In one of first technology: the optical fiber that access one section of discharge threshold is higher in fibre system is as photonic crystal fiber (PCF) (Dianov E M, Frolov A A, Bufetov L, et al. The fibre fuse effect in microstructured fibres [J]. Quantum Electronics. 2004
34(1): 59-61), aperture assists optical fiber (HAF) (Kurokawa K, Hanzawa N. Fiber fuse propagation and its suppression in hole-assisted fibers [J]. IEICE Transactions On Communications. 2011
e94-B(2): 384-391) or tapered fiber (Dianov E M, Bufetov I A, Frolov A A. Destruction of silica fiber cladding by the fuse effect [J]. Optics Letters. 2004,
29(16): 1852-1854) etc.This technology be make use of the higher discharge threshold of some special fibers or in discharge process optical fiber structure destroyed thus stop it to propagate.But this kind of mode, due to needs welding one section of special fiber, is not therefore all suitable for high-power fiber system.
In first technology two: be utilize photodetector (K. Kurokawa, and N. Hanzawa, Suppression of fiber fuse propagation and its break in compact fiber fuse terminator [C], OECC/PS, WS4-5 (2013)) or sensing element (Rocha A M, Antunes P F D C, de F á tima F. Domingues M, et al. Detection of fiber fuse effect using FBG sensors [J]. IEEE Sensors Journal. 2011, 11 (6): 1390-1394) visible ray produced when the melting of outer fiber detection optical fiber occurs.Adopt the mode of detector can detect when not affecting existing fiber system, feasibility is higher, but existing detection mode is fairly simple, generally directly detector is placed in outer fiber, so in actual applications because detector is to visible light-responded, so be easy to the situation causing wrong report and fail to report, detecting error is comparatively large, and precision is low.Adopt the mode of sensing element detection, precision is higher to a certain extent, but detection system more complicated.Therefore be necessary to design electric discharge detection and the rejection ability that a kind of simple, reliable detecting structure strengthens high-power fiber system.
In addition, the research for optics electric discharge also needs to detect the speed of electric discharge transmission.Mode main at present has image procossing and direct detection two kinds.Image procossing mode records scene when electric discharge occurs with fast camera exactly, is obtained and discharges the time of transmitting in fixed range, thus calculate speed by the mode of later image process.Direct detection mode utilizes timing circuit to obtain the time of transmitting of discharging in one section of regular length, and the signal that timing triggering signal is detected by photodetector provides.In view of aforesaid conventional detection methods precision is difficult to ensure, so also need new detection mode.
Summary of the invention
The transmission of discharging to suppress optics, improves the detection accuracy to optics electric discharge phenomena, the present invention proposes a kind of optics based on integrating sphere electric discharge detection and restraining device and a kind of optics that improves discharges the device of detection accuracy,
Described for detecting and suppressing the device of electric discharge transmission to comprise: an integrating sphere, a visible-light detector and Laser Power Devices cut off circuit, and described visible-light detector and Laser Power Devices cut off circuit and are connected, and visible-light detector is arranged in integrating sphere;
Described integrating sphere, for collecting the visible ray sent when electric discharge produces, before its position is arranged on the testing fiber easily producing point of discharge, integrating sphere is fixed on fixed flat planar by integrating sphere fixing threaded hole;
Fixed flat planar is provided with optical fiber standing groove, and optical fiber is placed in optical fiber standing groove;
Described visible-light detector, is converted to the signal of telecommunication for the signal that integrating sphere is collected, and as the triggering signal that next step controls, this detector is placed in integrating sphere;
Described Laser Power Devices are cut off circuit and are connected with integrating sphere by detectable signal transmission line, be connected with laser system power supply by dump signal transmssion line, Laser Power Devices cut off the signal that circuit acquisition visible-light detector sends, timely cut-out Laser Power Devices, multistage structure for amplifying is generally comprised for common high power laser system, cut-out circuit also must control Laser Power Devices and cut off successively toward prime from rear class, avoids damaging laser.
The device improving optics electric discharge detection accuracy comprises: integrating sphere I, integrating sphere II, two visible-light detectors and a time control circuit,
Described integrating sphere I and integrating sphere II are for collecting the visible ray sent when electric discharge produces, and integrating sphere I is positioned at the front end of testing fiber, and integrating sphere II is positioned at the rear end of testing fiber;
Described two visible-light detectors, are arranged in two integrating spheres respectively; Signal for integrating sphere is collected is converted to the signal of telecommunication, and the signal of a visible-light detector collection controls for opening timing, and the signal that another visible-light detector is collected controls for closing timing;
Described time control circuit is connected with two integrating spheres and laser respectively, for carrying out switch timing according to control signal, and cuts off laser power supply, and its precision is needed to determine by test;
Laser is connected with the integrating sphere being positioned at testing fiber front end by Transmission Fibers.
This device utilizes integrating sphere to collect the visible ray that electric discharge produces, and signal to noise ratio is high, can not false dismissal; Detector is placed in integrating sphere, when not discharging generation owing to not having interference signal in airtight environment, therefore without false-alarm simultaneously.When optics electric discharge occurs; the visible ray that electric discharge produces can transmit along fibre core; when passing to integrating sphere position; due to the receipts luminous energy power that integrating sphere is stronger; detector can meet with a response rapidly; produce voltage signal, now Laser Power Devices cut-out circuit utilizes this signal to cut off Laser Power Devices immediately, reaches the object of protection laser system.Whole device is simple, reliable, directly can apply in existing laser.
Optics based on integrating sphere provided by the invention electric discharge detection and restraining device and a kind of optics that improves discharges the device of detection accuracy, can improve the detection accuracy to optics electric discharge phenomena, suppress the transmission that optics discharges.
Accompanying drawing explanation
Fig. 1 is the apparatus structure schematic diagram of a kind of quick suppression optics electric discharge transmission of the present invention;
Fig. 2 is the integrating sphere device schematic diagram that the present invention detects optics electric discharge generation;
Fig. 3 is the apparatus structure schematic diagram of the optics electric discharge detection accuracy that the present invention is based on integrating sphere.
Embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
A kind of quick detection of the present invention as shown in Fig. 1, Fig. 2 comprises integrating sphere I 2, visible-light detector 9 with the device suppressing optics electric discharge to be transmitted, and power cutting circuit 4,
Described integrating sphere is a hollow hemisphere, and radius, at about 1cm, is fixed on fixed flat planar 8 by integrating sphere fixing threaded hole 7, and integrating sphere material is aluminium, and integrating sphere inwall needs polishing to increase the reflection of light;
Described fixed flat planar 8 is provided with optical fiber standing groove 10;
Place optical fiber in described optical fiber standing groove 10, well width at 1 ~ 2mm, depending on optical fiber used;
Described visible-light detector 9 is general visible response detector, is placed in the aperture of integrating sphere;
Described Laser Power Devices are cut off circuit 4 and are connected with integrating sphere by detectable signal transmission line 3, are connected with laser system power supply 6 by dump signal transmssion line 5.
When optics electric discharge occurs, the visible ray of its transmission transmits in the fibre core of Transmission Fibers 1, when arriving integrating sphere 2 position, the visible ray that integrating sphere is collected is responded by visible-light detector 9, produce voltage signal and be input to power cutting circuit 4, cut off the power supply 6 of laser system, reach the object suppressing electric discharge to continue transmission.
General for high-power laser system, all comprise some grades of amplification, therefore when control powered-down, must according to the order of first closing rear class and close again prime, the time interval is usually ten milliseconds of magnitudes.Compared with existing optics discharge prevention system, the optics electric discharge based on integrating sphere detects and suppresses system easy for installation, and without the need to transforming existing Optical Maser System, detection rapidly, accurately, protected effect is better.
Of the present invention a kind of device improving optics electric discharge detection accuracy as shown in Figure 3 comprises integrating sphere I 2, integrating sphere II 15,2 visible-light detectors 9, time control circuit 13, laser 11 and testing fibers 12;
Described integrating sphere I 2 and integrating sphere II 15 are separately positioned on the front and back end of testing fiber 12; Two visible-light detectors 9 are placed in integrating sphere I 2 and integrating sphere II 15 respectively; Time control circuit 13 is connected with integrating sphere I 2 by detectable signal transmission line 3, is connected, is connected by dump signal transmssion line with laser 11 by timing circuit start signal transmission line 14 with integrating sphere II 15; Laser 11 is connected with integrating sphere I 2 by Transmission Fibers 1.
Specific implementation process is as follows: bring out optical fiber electric discharge at the output of testing fiber and produce, make it along testing fiber to transmission back, when arriving integrating sphere II 15, visible-light detector measures visible light signal, timing circuit is opened by timing circuit start signal transmission line 14 triggering timing control circuit 13, optics electric discharge continues to transmit in testing fiber 12, when being transferred to integrating sphere I 2, visible-light detector detects signal again, control time control circuit 13 by detectable signal transmission line 3 and terminate timing, and close laser 11 power supply by dump signal transmssion line 5 simultaneously.
Due to testing fiber length
lcan measure easily, obtain the transmission time again by time control circuit
t, the speed of electric discharge transmission can be calculated
v=
l/
t.Compared with existing metering system, the electric discharge transmission speed measuring system based on integrating sphere is accurately convenient, has stronger practicality.
Claims (6)
1. quick detection and the device suppressing optics electric discharge transmission in optical fiber, comprise integrating sphere and visible-light detector, it is characterized in that, also comprise Laser Power Devices and cut off circuit,
Described visible-light detector and Laser Power Devices cut off circuit and are connected, and visible-light detector is arranged in integrating sphere;
Described integrating sphere, for collecting the visible ray sent when electric discharge produces, before being arranged on the testing fiber easily producing point of discharge, integrating sphere is fixed on fixed flat planar by integrating sphere fixing threaded hole;
Fixed flat planar is provided with optical fiber standing groove, and optical fiber is placed in optical fiber standing groove;
Described Laser Power Devices are cut off circuit and are connected with integrating sphere by detectable signal transmission line, are connected with laser system power supply by dump signal transmssion line, and Laser Power Devices cut off the signal that circuit acquisition visible-light detector sends, and cut off Laser Power Devices.
2. a kind of quick detection according to claim 1 and the device suppressing optics electric discharge transmission in optical fiber, it is characterized in that, described integrating sphere is a hollow hemisphere, and radius is at 1cm, and integrating sphere material is aluminium, and the polishing of integrating sphere inwall is to increase the reflection of light.
3. a kind of quick detection according to claim 1 and the device suppressing optics electric discharge transmission in optical fiber, it is characterized in that, the width of described optical fiber standing groove is at 1 ~ 2mm.
4. a kind of quick detection according to claim 1 and the device suppressing optics electric discharge transmission in optical fiber, it is characterized in that, described visible-light detector is general visible response detector.
5. improve a device for optics electric discharge detection accuracy, comprising: integrating sphere I, integrating sphere II, two visible-light detectors, is characterized in that, also comprise and a time control circuit,
Described integrating sphere I and integrating sphere II are for collecting the visible ray sent when electric discharge produces, and integrating sphere I is positioned at the front end of testing fiber, and integrating sphere II is positioned at the rear end of testing fiber;
Described two visible-light detectors, are arranged in integrating sphere I and integrating sphere II respectively; Signal for integrating sphere is collected is converted to the signal of telecommunication, and the signal of a visible-light detector collection controls for opening timing, and the signal that another visible-light detector is collected controls for closing timing;
Described time control circuit is connected with integrating sphere I, integrating sphere II and laser respectively, for carrying out switch timing according to control signal, and cuts off laser power supply;
Laser is connected with integrating sphere I by Transmission Fibers.
6. a kind of device improving optics electric discharge detection accuracy according to claim 5, it is characterized in that, device specific implementation process is as follows: bring out optical fiber electric discharge at the output of testing fiber and produce, make it along testing fiber to transmission back, when arriving integrating sphere II, visible-light detector measures visible light signal, timing is opened by timing circuit start signal transmission line triggering timing control circuit, optics electric discharge continues to transmit in testing fiber, when being transferred to integrating sphere I, visible-light detector detects signal again, control time control circuit by detectable signal transmission line and terminate timing, and close laser power supply by dump signal transmssion line simultaneously.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510022748.6A CN104601224B (en) | 2015-01-16 | 2015-01-16 | The device of the device of optics electric discharge transmission and a kind of raising optics electric discharge detection accuracy in a kind of quick detection and suppression optical fiber |
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|---|---|---|---|
| CN201510022748.6A CN104601224B (en) | 2015-01-16 | 2015-01-16 | The device of the device of optics electric discharge transmission and a kind of raising optics electric discharge detection accuracy in a kind of quick detection and suppression optical fiber |
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| CN104601224B CN104601224B (en) | 2017-06-27 |
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Citations (4)
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| CN102489451A (en) * | 2011-11-30 | 2012-06-13 | 义乌市菲莱特电子有限公司 | Automatic LED light-splitting and sorting system |
| CN103163438A (en) * | 2011-12-12 | 2013-06-19 | 中国科学技术大学 | Micro-discharger performance testing device and method |
| KR101291111B1 (en) * | 2011-03-23 | 2013-08-01 | 한국기계전기전자시험연구원 | Light measurement system |
| CN204334575U (en) * | 2015-01-16 | 2015-05-13 | 中国人民解放军国防科学技术大学 | A kind of quick detection and the device suppressing optics electric discharge transmission in optical fiber |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101291111B1 (en) * | 2011-03-23 | 2013-08-01 | 한국기계전기전자시험연구원 | Light measurement system |
| CN102489451A (en) * | 2011-11-30 | 2012-06-13 | 义乌市菲莱特电子有限公司 | Automatic LED light-splitting and sorting system |
| CN103163438A (en) * | 2011-12-12 | 2013-06-19 | 中国科学技术大学 | Micro-discharger performance testing device and method |
| CN204334575U (en) * | 2015-01-16 | 2015-05-13 | 中国人民解放军国防科学技术大学 | A kind of quick detection and the device suppressing optics electric discharge transmission in optical fiber |
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