CN104897370A - Fiber welding quality monitoring method and system - Google Patents
Fiber welding quality monitoring method and system Download PDFInfo
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- CN104897370A CN104897370A CN201510278786.8A CN201510278786A CN104897370A CN 104897370 A CN104897370 A CN 104897370A CN 201510278786 A CN201510278786 A CN 201510278786A CN 104897370 A CN104897370 A CN 104897370A
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Abstract
The embodiment of the invention provides a fiber welding quality monitoring method and system. The method includes determining insertion loss before and after light beams passing through a fiber welding point; determining pre-estimated passage of welding quality when the insertion loss is lower than a first threshold; determining the light beam characteristics before and after the light beams passing through the fiber welding point, if the pre-estimated passage of welding quality is determined; determining finally passage of welding quality if the light beam characteristics before and after the light beams passing through the fiber welding point are consistent; and determining, otherwise, final fail of the wending quality.
Description
Technical field
The present invention relates to a kind of optical fiber fusion welding technology field, particularly relate to a kind of optical fiber fusion quality monitoring method and system.
Background technology
Fused fiber splice is the process optical fiber that two root architecture features are not exclusively the same being fused into an optical fiber, and fused fiber splice is well used in the manufacture process of fiber laser, belongs to one of core technology.
The quality of the fusion point of fused fiber splice directly determines the performance of the equipment such as fiber laser, therefore the key of optical fiber fusion welding technology is also just become for the judgement of optical fiber fusion quality and monitoring, the result simultaneously judged and monitor can help again to improve welding procedure, improves welding quality.
Traditional welding quality determination methods relies on merely insertion loss to judge, insertion loss is less, assert that welding quality is better.But in the doubly clad optical fiber fusion process in fiber laser, judge that welding quality can become very inaccurate by insertion loss, this is because can return at the laser of inner cladding transmission the judgement interfering with welding quality.
For this reason, need to provide a kind of optical fiber fusion quality monitoring means of improvement can carry out more accurately and comprehensively judging to the quality of fused fiber splice.
Summary of the invention
The invention provides a kind of optical fiber fusion quality monitoring method and system, can carry out more accurately and more fully judging to optical fiber fusion quality.
For achieving the above object, one embodiment of the invention provides a kind of optical fiber fusion quality monitoring method, comprising:
Determine that light beam is by the insertion loss before and after optical fiber fusion welding point, when insertion loss is lower than first threshold, judge that welding quality Pre-Evaluation passes through;
After judgement welding quality Pre-Evaluation passes through, determine that described light beam is by the beam characteristics before and after described optical fiber fusion welding point, when finding that described light beam is consistent by the beam characteristics before and after described optical fiber fusion welding point, judge welding quality eventually through, otherwise judge that welding quality does not finally pass through.
In a preferred embodiment, described light beam comprises the hot spot distribution character of described light beam by the lateral cross section before and after optical fiber fusion welding point by the beam characteristics before and after optical fiber fusion welding point.
In a preferred embodiment, describedly determine that light beam is comprised by the beam characteristics before and after optical fiber fusion welding point: by image acquisition unit, obtain the light spot image of described light beam by the lateral cross section before and after optical fiber fusion welding point respectively.
In a preferred embodiment, from the light path of described light beam before optical fiber fusion welding point, segment beam is separated by the first spectroscope, as the first input beam to be detected, and obtained the light spot image of the lateral cross section of described first input beam to be detected by described image acquisition unit, as the light spot image of described light beam by the lateral cross section before optical fiber fusion welding point;
From the light path of described light beam after optical fiber fusion welding point, segment beam is separated by the second spectroscope, as the second input beam to be detected, and obtained the light spot image of the lateral cross section of described second input beam to be detected by described image acquisition unit, as the light spot image of described light beam by the lateral cross section after optical fiber fusion welding point.
In a preferred embodiment, describedly determine that light beam is comprised by the insertion loss before and after optical fiber fusion welding point:
Determine that light power meter determines that described light beam is by the luminous power before described optical fiber fusion welding point with by the luminous power after described optical fiber fusion welding point respectively, and by described light beam by the luminous power before optical fiber fusion welding point with by the luminous power after optical fiber fusion welding point, calculate described light beam by the insertion loss before and after optical fiber fusion welding point.
The embodiment of the present invention also provides a kind of optical fiber fusion quality monitoring system on the other hand, comprising:
Insertion loss determination subsystem, for determining that light beam is by the insertion loss before and after optical fiber fusion welding point, when described insertion loss is lower than first threshold, judges that welding quality Pre-Evaluation passes through;
Beam characteristics determination subsystem, for after judgement welding quality Pre-Evaluation passes through, determine that described light beam is by the beam characteristics before and after described optical fiber fusion welding point, when finding that described light beam is consistent by the beam characteristics before and after described optical fiber fusion welding point, judge welding quality eventually through, otherwise judge welding quality finally do not pass through.
In a preferred embodiment, described beam characteristics determination subsystem comprises:
Image acquisition unit, for obtaining the light spot image of described light beam by the lateral cross section before and after optical fiber fusion welding point respectively, to determine that described light beam is by the beam characteristics before and after optical fiber fusion welding point.
In a preferred embodiment, described beam characteristics determination subsystem also comprises: the first spectroscope and the second spectroscope;
Described first spectroscope is placed in the light path of described light beam before optical fiber fusion welding point, and described second spectroscope is placed in the light path of described light beam after described optical fiber fusion welding point;
Described first spectroscope is from the light path of described light beam before optical fiber fusion welding point, separate segment beam, as the first input beam to be detected, described image acquisition unit obtains the light spot image of the lateral cross section of this first input beam, as the light spot image of described light beam by the lateral cross section before described optical fiber fusion welding point;
Described second spectroscope is from the light path of described light beam after optical fiber fusion welding point, separate segment beam, as the second input beam to be detected, described image acquisition unit obtains the light spot image of the lateral cross section of this second input beam, as the light spot image of described light beam by the lateral cross section after described optical fiber fusion welding point.
In a preferred embodiment, described insertion loss determination subsystem comprises:
Light power meter, for determining that described light beam is by the luminous power before optical fiber fusion welding point with by the luminous power after described optical fiber fusion welding point respectively, and by described light beam by the luminous power before optical fiber fusion welding point with by the luminous power after optical fiber fusion welding point, calculate described light beam by the insertion loss before and after optical fiber fusion welding point.
The scheme that the embodiment of the present invention provides without by insertion loss because usually tentatively judging the quality of fused fiber splice, also comprehensively can determine whether welding quality finally meets the demands by the change of beam characteristics before and after optical fiber fusion welding point by light beam.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of the optical fiber fusion quality monitoring system that the embodiment of the present invention provides;
Fig. 2 be in the embodiment of the present invention when optical fiber fusion quality meets the demands light beam by the light spot image of the lateral cross section after optical fiber fusion welding point;
Fig. 3 to Fig. 5 be in the embodiment of the present invention when optical fiber fusion quality does not meet the demands light beam by the light spot image of the lateral cross section after optical fiber fusion welding point.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
Fig. 1 shows the schematic diagram of a kind of optical fiber fusion quality monitoring system that the embodiment of the present invention provides, and below in conjunction with this optical fiber fusion quality monitoring system, the realization of optical fiber fusion quality monitoring method provided by the invention and the composition of monitoring system is described.
As shown in Figure 1, the end face of optical fiber 1a and optical fiber 1b carries out welding, and fusion point is 1c, needs to monitor the welding quality at fusion point 1c place in the embodiment of the present invention.The laser for this reason exported by light source 6 from the input of optical fiber 1a side, and is exported by optical fiber 1b side, and judges the welding quality of fusion point 1c by the feature between the laser of input and the laser of output.Those skilled in the art should be understood that, the laser that light source 6 can also be allowed to export from the input of optical fiber 1b side, and is exported by optical fiber 1a side, also can judge the welding quality of fusion point 1c.
First judgement in the present embodiment for welding quality needs to carry out Pre-Evaluation, particularly, determine that light beam that light source 6 exports is by the insertion loss before and after optical fiber fusion welding point 1c, when insertion loss first threshold, judges that the welding quality Pre-Evaluation of fusion point 1c passes through.Light source 6 can be laser instrument, such as, can be the laser instrument of 1064nm for output light wavelength.
Determine above-mentioned insertion loss, need to determine that light beam that light source 6 exports is by the luminous power after the luminous power before optical fiber fusion welding point 1c and optical fiber fusion welding point 1c, and by the difference determination insertion loss of these two luminous powers.In practice, determine that luminous power can use light power meter.
For Fig. 1, the light beam that light source 6 exports is coupled into optical fiber 1a by condenser lens 2, and the light beam exported from optical fiber 1b carries out collimation output by collimation lens 3.In order to realize the measurement of light beam by the luminous power before fusion point 1c, 3rd spectroscope 11 is set between light source 6 and condenser lens 2, to separate segment beam from the light path of light beam before fusion point 1c, as the 3rd input beam to be detected, the luminous power of the 3rd input beam is measured, to pass through the value of the luminous power before optical fiber fusion welding point 1c as light beam by the first light power meter 7.In practice, above-mentioned 3rd spectroscope 11 can be the semi-transparent semi-reflecting lens be obliquely installed, and the segment beam of reflection is as the 3rd input beam to be detected, and the segment beam of transmission transmits to the direction of fusion point 1c.In order to realize the measurement of light beam by the luminous power after fusion point 1c, in the side away from fusion point 1c of collimation lens 3, the second spectroscope 5 is set, to separate segment beam from the light path of light beam after fusion point 1c, as the 4th input beam to be detected, and measured the luminous power of the 4th input beam by the second light power meter 8, to pass through the value of the luminous power after optical fiber fusion welding point 1c as light beam.In practice, above-mentioned second spectroscope 5 can be the semi-transparent semi-reflecting lens be obliquely installed, and the part of projection is as the 4th input beam.
In FIG, determine that the luminous power before and after light beam fusion point 1c realizes respectively by two light power meters, in practice, same luminous power can also be used to gather the light signal of the 3rd input beam and the 4th input beam respectively by the mode of timesharing, and determine the luminous power of the 3rd input beam and the luminous power of the 4th input beam respectively.In order to collection the 3rd input beam of above-mentioned timesharing and the light signal of the 4th input beam, can the 3rd input beam and the 4th input beam be incorporated on a point of light switch, and passed through by this point of light switch control the 3rd input beam and the 4th input beam timesharing, the light signal of the light beam that light power meter collection is passed through.
The luminous power of the 3rd input beam and the luminous power of the 4th input beam are all imported in computer processor unit 9, computer processor unit 9 utilizes the luminous power of above-mentioned two input beams, determine that light beam is by the insertion loss before and after optical fiber fusion welding point 1c, when insertion loss is lower than first threshold, judge that welding quality Pre-Evaluation passes through, if do not passed through, then need the welding quality improving fusion point 1c immediately, or welding again.
Above-mentioned light power meter and computer processor unit actually constitute insertion loss determination subsystem.
After Pre-Evaluation is carried out to welding quality, if Pre-Evaluation passes through, then continue to need to be determined by the beam characteristics change before and after optical fiber fusion welding point 1 light beam, need to determine that light beam is by the beam characteristics before and after optical fiber fusion welding point 1c for this reason, and when finding that light beam is consistent by the beam characteristics before and after optical fiber fusion welding point 1c, judge welding quality eventually through, otherwise judge welding quality finally do not pass through.
As shown in Figure 1, segment beam can be separated by the first spectroscope 4 be arranged in the light path of light beam before optical fiber fusion welding point 1c, as the first input beam to be detected, and the light spot image of the lateral cross section of this first input beam is obtained by image acquisition unit (being specially CCD 1 in Fig. 1), this light spot image as the concrete manifestation form of beam characteristics, so can as light beam by the beam characteristics before fusion point 1c.
Segment beam can also be separated by the second spectroscope 5 be arranged in the light path of light beam after optical fiber fusion welding point 1c, as the second input beam to be detected, and the light spot image of the lateral cross section of this second input beam is obtained by image acquisition unit (being specially CCD 1 in Fig. 1), this light spot image as the concrete manifestation form of beam characteristics, so can as light beam by the beam characteristics after fusion point 1c.
It should be noted that, in FIG, same CCD 1 had both been used for the light spot image of acquisition first input beam, was also used for the light spot image of acquisition second input beam, and this can be realized by this CCD 1 of time-sharing multiplex.Two CCD can certainly be set, be used for obtaining the light spot image of the first input beam and the light spot image of the second input beam respectively.
In addition, CCD is only a kind of specific implementation of image acquisition unit, can also adopt the image acquisition unit of other types in practice.
The light spot image of the first input beam and the light spot image of the second input beam all can be sent to computer processor unit 9, carry out robotization by computer processor unit 9 and judge that whether the beam characteristics that two light spot images reflect is consistent, also by the display driven by computer processor unit 9, two light spot images can be shown, carry out artificial judgment by user.
In fact, CCD 1 and computer processor unit 9 constitute beam characteristics subsystem.
Usually, from the characteristic that the intensity distributions of the light spot image of the lateral cross section of the light beam of light source 6 (especially adopting laser instrument as the situation of light source) directly output becomes strong edge, center weak.If the welding quality of optical fiber fusion welding point 1c meets the demands, also same characteristic should be met by the intensity distributions of the light spot image of the lateral cross section of the light beam after optical fiber fusion welding point 1c.Under Fig. 2 shows the good situation of welding quality of optical fiber fusion welding point 1c, light beam is by the intensity distributions of the light spot image of the lateral cross section of the light beam after optical fiber fusion welding point 1c.
Fig. 3-Fig. 5 respectively illustrate several welding quality bad when, light beam is by the intensity distribution of the light spot image of the lateral cross section of the light beam after optical fiber fusion welding point 1c, can find out in the intensity distributions of these light spot images and all occur at least two peak Distribution points, different from the intensity Distribution of the light spot image of the lateral cross section of the light beam that light source 6 directly exports, its reason is the not high phenomenon causing creating in beam Propagation process characteristic variations of welding quality that fusion point 1c goes out.
Although depict the application by embodiment, those of ordinary skill in the art know, the application has many distortion and change and do not depart from the spirit of the application, and the claim appended by wishing comprises these distortion and change and do not depart from the spirit of the application.
Claims (9)
1. an optical fiber fusion quality monitoring method, is characterized in that, comprising:
Determine that light beam is by the insertion loss before and after optical fiber fusion welding point, when insertion loss is lower than first threshold, judge that welding quality Pre-Evaluation passes through;
After judgement welding quality Pre-Evaluation passes through, determine that described light beam is by the beam characteristics before and after described optical fiber fusion welding point, when finding that described light beam is consistent by the beam characteristics before and after described optical fiber fusion welding point, judge welding quality eventually through, otherwise judge that welding quality does not finally pass through.
2. method according to claim 1, is characterized in that, described light beam comprises the hot spot distribution character of described light beam by the lateral cross section before and after optical fiber fusion welding point by the beam characteristics before and after optical fiber fusion welding point.
3. method according to claim 2, is characterized in that, describedly determines that light beam is comprised by the beam characteristics before and after optical fiber fusion welding point: by image acquisition unit, obtain the light spot image of described light beam by the lateral cross section before and after optical fiber fusion welding point respectively.
4. method according to claim 3, it is characterized in that, from the light path of described light beam before optical fiber fusion welding point, segment beam is separated by the first spectroscope, as the first input beam to be detected, and obtained the light spot image of the lateral cross section of described first input beam to be detected by described image acquisition unit, as the light spot image of described light beam by the lateral cross section before optical fiber fusion welding point;
From the light path of described light beam after optical fiber fusion welding point, segment beam is separated by the second spectroscope, as the second input beam to be detected, and obtained the light spot image of the lateral cross section of described second input beam to be detected by described image acquisition unit, as the light spot image of described light beam by the lateral cross section after optical fiber fusion welding point.
5. method according to claim 1, is characterized in that, describedly determines that light beam is comprised by the insertion loss before and after optical fiber fusion welding point:
Determine that light power meter determines that described light beam is by the luminous power before described optical fiber fusion welding point with by the luminous power after described optical fiber fusion welding point respectively, and by described light beam by the luminous power before optical fiber fusion welding point with by the luminous power after optical fiber fusion welding point, calculate described light beam by the insertion loss before and after optical fiber fusion welding point.
6. an optical fiber fusion quality monitoring system, is characterized in that, comprising:
Insertion loss determination subsystem, for determining that light beam is by the insertion loss before and after optical fiber fusion welding point, when described insertion loss is lower than first threshold, judges that welding quality Pre-Evaluation passes through;
Beam characteristics determination subsystem, for after judgement welding quality Pre-Evaluation passes through, determine that described light beam is by the beam characteristics before and after described optical fiber fusion welding point, when finding that described light beam is consistent by the beam characteristics before and after described optical fiber fusion welding point, judge welding quality eventually through, otherwise judge welding quality finally do not pass through.
7. system according to claim 6, is characterized in that, described beam characteristics determination subsystem comprises:
Image acquisition unit, for obtaining the light spot image of described light beam by the lateral cross section before and after optical fiber fusion welding point respectively, to determine that described light beam is by the beam characteristics before and after optical fiber fusion welding point.
8. system according to claim 7, is characterized in that, described beam characteristics determination subsystem also comprises: the first spectroscope and the second spectroscope;
Described first spectroscope is placed in the light path of described light beam before optical fiber fusion welding point, and described second spectroscope is placed in the light path of described light beam after described optical fiber fusion welding point;
Described first spectroscope is from the light path of described light beam before optical fiber fusion welding point, separate segment beam, as the first input beam to be detected, described image acquisition unit obtains the light spot image of the lateral cross section of this first input beam, as the light spot image of described light beam by the lateral cross section before described optical fiber fusion welding point;
Described second spectroscope is from the light path of described light beam after optical fiber fusion welding point, separate segment beam, as the second input beam to be detected, described image acquisition unit obtains the light spot image of the lateral cross section of this second input beam, as the light spot image of described light beam by the lateral cross section after described optical fiber fusion welding point.
9. system according to claim 6, is characterized in that, described insertion loss determination subsystem comprises:
Light power meter, for determining that described light beam is by the luminous power before optical fiber fusion welding point with by the luminous power after described optical fiber fusion welding point respectively, and by described light beam by the luminous power before optical fiber fusion welding point with by the luminous power after optical fiber fusion welding point, calculate described light beam by the insertion loss before and after optical fiber fusion welding point.
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| CN107367373A (en) * | 2016-05-13 | 2017-11-21 | 陕西昱琛航空设备有限公司 | A kind of optical cable wire harness assembly connecting fault check device and inspection method |
| CN108240900A (en) * | 2018-01-26 | 2018-07-03 | 国网山东省电力公司信息通信公司 | A kind of power engineering cable connection is averaged splice loss, splice attenuation method of real-time |
| CN109813528A (en) * | 2019-03-18 | 2019-05-28 | 中国科学院上海光学精密机械研究所 | Detection method is lost in optical fiber laser based on optical time domain reflection principle |
| CN110286125A (en) * | 2019-06-12 | 2019-09-27 | 刘帅奇 | A kind of optical fiber fusion quality detection method based on image |
| CN110987011A (en) * | 2019-12-13 | 2020-04-10 | 西安航天精密机电研究所 | Optical path fusion performance detection method for fiber-optic gyroscope |
| CN114046962A (en) * | 2021-10-29 | 2022-02-15 | 广东利元亨智能装备股份有限公司 | Method and device for detecting quality of optical fiber fusion point |
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