CN210089976U - Optical fiber refractive index and internal stress measuring device based on QPM and BKC technology - Google Patents
Optical fiber refractive index and internal stress measuring device based on QPM and BKC technology Download PDFInfo
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- CN210089976U CN210089976U CN201920416867.3U CN201920416867U CN210089976U CN 210089976 U CN210089976 U CN 210089976U CN 201920416867 U CN201920416867 U CN 201920416867U CN 210089976 U CN210089976 U CN 210089976U
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Abstract
The utility model relates to an optic fibre refractive index distribution and internal stress comprehensive measurement device based on QPM and BKC technique belongs to the optical detection field. The device includes: the device comprises a laser light source, a laser collimator, a reflector, an attenuator, a polarizer, a lens group, an objective table, a matching liquid pool, a high-precision short-thread linear moving platform, a stepping motor, an objective lens, a compensator, an analyzer, a beam splitter, an ocular lens, a CCD, a computer and an optical fiber to be measured. Through the cooperation of light path and device, measuring device adopts QPM and BKC technique to realize the joint measurement to optic fibre refracting index and internal stress distribution on same platform, measures simply, easy operation. Meanwhile, the optical fiber nondestructive measurement of the measuring device eliminates the measurement error caused by uneven section in the method for measuring the cut optical fiber. In addition, the device can realize the accurate measurement of the refractive index and the internal stress distribution of all optical fibers, and provides practical guarantee for the production and the use of the space division multiplexing optical fiber and other special optical fibers.
Description
Technical Field
The utility model relates to an optic fibre refractive index distribution and internal stress comprehensive measurement device based on QPM and BKC technique belongs to the optical detection field.
Background
With the rapid development of the high-speed information era, the common single-mode optical fiber has gradually failed to meet the requirement of the transmission capacity of the optical fiber system. In recent years, a novel space division multiplexing optical fiber and other special optical fibers, which are mainly multi-core optical fibers, few-mode optical fibers and the like, are good optical elements for solving the problems of limited transmission capacity, nonlinear effect damage and the like in an optical fiber system due to unique core arrangement mode and mode field characteristics. The performance of the optical fiber depends on the structural parameters, refractive index distribution and internal stress distribution of the optical fiber. The change of the optical fiber parameters can cause the change of the optical fiber performance, and the serious possibility directly causes the damage of the device. Therefore, it is very important to measure the refractive index distribution and internal stress of the optical fiber during the production and use of the optical fiber. However, the spatial division multiplexing optical fiber and other special optical fibers have different internal structural characteristics from those of the ordinary single mode optical fiber, which puts higher requirements on the measurement system of optical fiber parameters.
For the measurement of the refractive index profile of an optical fiber, axial and transverse measurements are mainly classified. The axial measurement requires cutting the optical fiber and measuring the refractive index distribution of the end face thereof. Axial Measurement of the refractive Index of optical fibers began with the end face Reflection Method proposed by Ikeda et al in 1975 by directing a beam of light at the end face of the fiber and measuring the intensity of the reflected beam to reconstruct the cross-sectional refractive Index Profile [ Ikeda Masahiro, Tateda Mitsuhiro, Yoshikiyo Haruo.reflective Index Profile of a Graded Index fiber: Measurement by a Reflection Method [ J ]. Applied Optics,1975,14(4): 814-. However, this technique requires the measuring instrument to have a high sensitivity to detect a weak reflected light from the end face of the optical fiber, otherwise it is difficult to obtain an accurate refractive index measurement result. Although young et al have made some improvements to this technology in recent years, they still have not overcome the above disadvantages [ young you, Kim dug young. light focused approach technology for sub-micrometer-sensitive reactive index measurement of an optical wave guide ] [ J ] Applied Optics,2007,46(15): 2949-.
In 1981, Young et al proposed a near-field refraction method, in which a light beam is incident on the end face of an optical fiber at an angle larger than the maximum acceptance angle of the optical fiber, and the refractive index profile of the optical fiber is obtained by measuring the spatial light distribution refracted out of the optical fiber [ J ]. Applied Optics, 1981,20(19):3415- > 3422 ]. Based on this technique, Fontaine et al, 1999, invented a refractive index profile measurement instrument, however, the measurement required precise calibration of the fiber sample, otherwise the measurement accuracy was poor [ Fontaine Norman h., Young mat, Two-dimensional index profiling of fibers and waveguides [ J ]. Applied Optics,1999,38(33): 6836-.
In 1976, Presby proposed an axial interferometer method, which uses a monochromatic light source and a Mach-Zehnder interferometer to axially insert a prepared fiber sample into the optical path of an interference arm of the interferometer to generate a certain phase shift, and obtains the refractive index distribution of the fiber through the obtained interference pattern. However, this method requires a particularly careful preparation of the fiber sample and a compromise between lateral resolution and measurement accuracy must be found [ J ] Review of Scientific Instruments 1976,47(3):348 and 352 ].
In 1994, Zhong et al proposed a method for measuring the refractive index of an optical fiber using chemical etching in combination with an atomic force microscope [ Qian Zhong, Inniss D.Characterisation of the lighting structure of optical fibers by atomic force microscope [ J ]. Journal of lightwave technology,1994,12(9): 1517-. The method is a non-optical measuring method, and the measuring precision can reach the nm order. However, in this method, the refractive index profile must be obtained from the depth and speed of the fiber's etching, and accurate sample calibration is required.
In view of the above axial measurement techniques, the biggest disadvantage is that the optical fiber must be cut to measure, which is not allowed in many cases, for example, when some special optical fiber with high price or some important optical fiber devices are characterized, destructive measurement increases the cost, and the devices are damaged in serious cases.
The other optical fiber refractive index measurement technology, namely the transverse measurement technology, belongs to nondestructive measurement and has higher measurement resolution, and is the main method for measuring the refractive index at present. Lateral measurement techniques began in 1979 when Boggs and Presby et al proposed the use of lateral interferometer (Transverse Interferometry) to measure the refractive index profile of optical fibers. The optical Fiber is surrounded by Index matching oil and then inserted into one interference arm of the interferometer transversely, so that the light beam passes through the optical Fiber transversely, different phases are accumulated after the light beam passes through the optical Fiber and the Index matching oil, and a certain phase difference is generated between the light beam and the optical Fiber, and the refractive Index profile of the optical Fiber is obtained by utilizing the light beam interference images of the two interference arms [ Presby H.M., Marcuse D., Astle H.W., Boggs L.M.Rapid Automatic Index Profiling of wheel-Fiber Samples: Part II. [ J ]. Bell System Technical Journal,1979,58(4): 883-. However, this method does not yield a cross-sectional refractive index profile of the optical fiber.
In 2005, Bachim et al introduced the fault-layer scanning principle in the lateral interferometer method, and obtained the cross-sectional refractive index distribution of the optical fiber by rotating the optical fiber for multiple measurements, which is called micro-interference optical phase tomography (BachimBrent L., Gaylord Thomas K. micro-interferometric optical phase tomography for measuring small, and by using the micro-interferometric reactive-index differences in the profiles of optical fibers and fiber devices [ J ] Applied Optics,2005,44(3):316-327 ]. However, this method requires analysis of the displacement of the interference fringes, and also requires a compromise between lateral resolution, which is low, and measurement accuracy.
In 2010, Yablon proposed a dispersive Fourier Transform Spectroscopy technique (Fouter-TransfomSpectroscopy) to measure the cross-sectional Refractive Index profile of an Optical Fiber, which belongs to the interferometric measurement method [ YablonA.D. Multi-wavelet Optical Fiber reflective Index Profiling by spectral resolved Spectroscopy ] [ J ]. Journal of Lightwave Technology,2010,28(4): 360-364 ]. However, this method requires a lot of interference patterns by moving the optical wedge, and the measurement process is complicated.
In addition to the above methods, Barty et al, 1998, proposed a non-interferometric technique, Quantitative Phase Microscopy (QPM), which is a method of measuring the Phase shift that occurs after a beam of light traverses through an optical fiber, to measure the refractive index profile of an optical fiber [ Barty A., Nugent K.A., Paganin D., Roberts A. Quantitative optical Phase Microscopy [ J ]. Optics Letters,1998,23(11):817-819 ]. The method obtains the phase shift distribution by using the intensity transmission equation, has very high spatial resolution and refractive index accuracy, and is widely applied. In 2000, Barty has also used QPM technology in combination with computed tomography technology to achieve three-dimensional measurement of refractive index profile of a dual-core fiber [ Barty a., nuclear k.a., Roberts a., palling d.quantitative phase shift [ J ] Optics Communications,2000,175(4): 329) 336 ]. However, the optical fiber structure measured by the method is simple at present, and the optical fiber parameter measurement process for complex refractive index distribution still needs to be optimized.
The measurement principle for fiber stress distribution is mainly based on the photoelastic effect. Residual stress in the fiber can cause birefringence, which, according to the photoelastic effect, causes some optical retardation as the beam traverses the fiber. By measuring the distribution of the optical delay, the distribution characteristic of the residual stress in the optical fiber can be calculated.
Study on optical retardation measurement methods, which began in 1982 for the first time, Chu and Whitbreak proposed measuring optical retardation using a phase compensation method, in which linearly polarized light incident into an experimental optical path is changed in polarization state after passing through an optical fiber and 1/4 glass slides, then a zero light intensity distribution is obtained by rotating an analyzer, and then a distribution of optical retardation [ Chu P.L ], Whitbreak T.stress transformation product torque injection in optical fiber ] J. However, this method requires precise adjustment and optimization of the phase compensator, and is complicated.
In 2005, Colomb et al proposed the use of polarized digital holographic microscopy to measure optical retardation by experimentally obtaining intensity profiles of two reference beams interfering with a beam traversing the fiber [ Colomb Trista, Durr Florian, Cuche Etienne, Marquet Pierre, Limber Hans G., Salatherene-Paul, unpeeurring Christian. polarization microscope by use of a digital threshold: Application to optical-fiber biological reference measures [ J ] Applied Optics,2005,44(21):4461-4469 ]. However, this experimental method requires a lot of beam splitting prisms, glass slides and polarizers to control the polarization state of the three beams of light, which is difficult.
In 2006, Bruno et al reported experimental methods for optical delay measurements using the phase stepping photoelastic effect [ Bruno Luigi, Pagnotta Leonardo, Poggerialini Andrea.A full-field methods for measuring residual stresses in optical fibers [ J ] Optics and Lasers in engineering,2006,44(6): 577-. However, this method requires a plurality of slides to generate a sufficient number of light intensity distribution images, and is complicated.
In 2008 Sevigny et al reported a method of optical delay measurement using phase modulator technology [ Sevigny Benoit, Busque
Godbout Nicolas,Lacroix Suzanne,FaucherMathieu.High-resolution refractive index anisotropy measurement in opticalfibers through phase retardation modulation.[J]Applied Optics,2008,47(9): 1215-. However, the phase modulators used in this method are not commercially available, require special customization, and are complex and expensive.
In addition to the above method, Brace-
The Compensator method (BKC: Brace-Kohler Compensator) can accurately measure lower optical retardation [ Montarou Carole C., Gaylordthomas K., Dachevski Alexei., identification strain profiles in optical fibers determined by the two-way-wave plate-Compensator method ] [ J-wave plate-Compensator method ]]Optics communications,2006,265(1):29-32. The experimental setup in this method is the same as the dual slide compensator method, but the compensator needs to be rotated during use. Unlike the dual slide compensator method, which requires the minimum light intensity distribution rather than the zero light intensity distribution, the method has a simple structure and high accuracy, and is a popular method at present. In 2009, Hutsel utilizes BKC method in combination with computed tomography technology to realize measurement of fiber stress distribution, and obtains three-dimensional distribution of measured fiber stress [ Hutsel Michael r, index Reeve, Gaylord thomas k]Applied optics,2009,48(26): 4985-. However, this method requires precise design of the compensator rotating device, and imposes high requirements on the rotating precision, and needs to be improved in subsequent designs.
Because there is a certain relationship between the fiber stress and the refractive index, the joint measurement of the fiber refractive index and the stress is very important. In 2012, Hutsel et al achieved a joint measurement of the refractive index and stress distribution of optical fibers [ Hutsel Michael R, Gaylord Thomas K. Current three-dimensional characteristics, magnetically responsive active-index and reactive-stress distributions in optical fibers [ J ]. Applied Optics,2012, 51(22): 5442-.
However, the method of joint measurement of refractive index and stress proposed by Hutsel et al is not suitable for space division multiplexing optical fiber and other specialty optical fibers. In the measurement of the space division multiplexing optical fiber, mainly because the fiber cores of the multi-core optical fiber have power coupling, the distance between the cores is very close, and the light at the emergent end can be superposed in space, so that the measurement precision can not be ensured. Therefore, at present, no mature and commercial measuring device exists at home and abroad for the joint measurement of the geometric parameters, the refractive index and the stress distribution of the space division multiplexing optical fiber and other special optical fibers.
Disclosure of Invention
The utility model discloses the technical problem that will solve is mainly to realize simultaneously that this problem of device to all optic fibre refracting indexes and internal stress distribution precision measurement proposes.
The technical scheme for solving the technical problems is as follows:
the utility model relates to a comprehensive measurement device of optic fibre refracting index and internal stress distribution based on QPM and BKC technique, include:
laser light source, laser collimator, speculum, attenuator, polarizer, battery of lens, objective table, matching liquid pond, high accuracy short-thread linear moving platform, step motor, objective, compensator, analyzer, beam splitter, eyepiece, CCD, computer and the optic fibre that awaits measuring, laser light source is connected with laser collimator and is made laser penetrate the light path and pass through attenuator, polarizer, battery of lens, objective table, matching liquid pond, the optic fibre that awaits measuring, objective, compensator, analyzer, beam splitter, eyepiece and CCD in proper order through the speculum, forms complete optic fibre refracting index distribution and internal stress integrated measuring device.
The attenuator attenuates the laser source energy to protect the CCD camera and extend its useful life.
The lens group converges the laser at the optical fiber to be detected in the matching liquid pool.
The matching liquid pool is arranged on the objective table, two ends of the matching liquid pool are respectively provided with a 90-degree angle V-shaped groove for placing the optical fiber to be detected, the center of the optical fiber to be detected is aligned with the center of the matching liquid pool, and the optical fiber to be detected is completely immersed in the matching liquid.
The high-precision short-thread linear moving platform is connected with the objective table, the objective table is controlled to defocus in a micro-displacement mode with positive and negative weak, light intensity distribution images at different positions are obtained through the CCD, and the light intensity distribution images are processed by the computer to obtain refractive index distribution images.
One end of the optical fiber to be detected is connected with a stepping motor, the stepping motor controls the optical fiber to be detected to rotate for 180 degrees, the optical path difference under different angles is obtained through a CCD, and an internal stress distribution image is obtained after the optical fiber is processed by a computer.
The compensator is provided with a rotating device, can rotate 360 degrees, can be detached from the rotating device and is only used for measuring the internal stress of the optical fiber.
The CCD camera can generate high-precision gray value images and data and transmit the high-precision gray value images and data into a computer for post-processing.
The beneficial effects of the utility model are specifically as follows: the measuring device adopts QPM and BKC technologies to realize the combined measurement of the optical fiber refractive index and the internal stress distribution with high measurement precision and high resolution on the same platform, and the measurement is simple and easy to operate. Meanwhile, when the measuring device is used for measuring optical fiber parameters, the optical fiber nondestructive measurement is realized, and the measurement error caused by uneven tangent plane in the method for measuring the cut optical fiber is eliminated. The measuring device can realize the accurate measurement of the refractive index and the internal stress distribution of all optical fibers, and provides practical guarantee for the production and the use of space division multiplexing optical fibers and other special optical fibers.
Drawings
Fig. 1 is a schematic diagram of an optical fiber refractive index distribution and internal stress comprehensive measurement device based on QPM and BKC technologies.
FIG. 2 is a schematic view of the structure of a matching fluid tank.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example one
In this example, an integrated measuring apparatus for optical fiber refractive index and internal stress distribution based on QPM and BKC techniques includes:
the device comprises a laser light source 101, a laser collimator 102, a reflector 201, an attenuator 202, a polarizer 203, a lens group 205, a stage 301, a matching liquid pool 302, a high-precision short-thread linear moving platform 303, a stepping motor 304, an objective lens 206, a compensator 4, an analyzer 204, a beam splitter 207, an eyepiece 208, a CCD5, a computer 6 and a few-mode optical fiber 001 to be measured, wherein the laser light source 101 is connected with the laser collimator 102 so that the central wavelength of the laser light source 101 is 1064nm, laser enters a light path through the reflector 201 and sequentially passes through the attenuator 202, the polarizer 203, the lens group 205, the stage 301, the matching liquid pool 302, the optical fiber 001 to be measured, the objective lens 206, the compensator 4, the analyzer 204, the beam splitter 207, the eyepiece 208 and the CCD5 to form a complete optical fiber refractive index distribution and comprehensive measurement device.
The attenuator 202 attenuates the laser source energy to protect the CCD5 camera and extend its useful life.
The lens assembly 205 converges the laser light at the optical fiber 001 to be tested in the matching liquid pool 302.
Matching liquid pool 302 is arranged on objective table 301, and matching liquid pool 302 height is 1mm, and the both ends are respectively opened a degree of 90 degrees V type groove that is 0.5mm deeply and are used for placing the optic fibre 001 that awaits measuring, and the optic fibre 001 center that awaits measuring aligns with matching liquid pool 302 center, and the optic fibre 001 that awaits measuring soaks in the matching liquid completely.
The high-precision short-thread linear moving platform 303 is connected with the objective table 301, the objective table 301 is controlled to defocus in a positive and a negative weak mode at the micro displacement of 1 micron magnitude, light intensity distribution images at different positions are obtained through the CCD5, and the light intensity distribution images are processed by the computer 6 to obtain refractive index distribution images.
One end of the optical fiber 001 to be measured is connected with the stepping motor 304, the stepping motor 304 controls the optical fiber 001 to be measured to rotate 180 degrees with 0.1 degree as precision, the optical path difference under different angles is obtained through the CCD5, and an internal stress distribution image is obtained after the optical path difference is processed by the computer 6.
The compensator 4 is provided with a rotating device, so that the compensator 4 can rotate 360 degrees at an angle smaller than 0.1 degree, and the compensator 4 can be detached from the rotating device and is only used for measuring the internal stress of the optical fiber.
The CCD5 camera can generate high precision grayscale images and data that are sent to the computer 6 for post processing.
Example two
In this example, an integrated measuring apparatus for optical fiber refractive index and internal stress distribution based on QPM and BKC techniques includes:
the device comprises a laser light source 101, a laser collimator 102, a reflector 201, an attenuator 202, a polarizer 203, a lens group 205, a stage 301, a matching liquid pool 302, a high-precision short-thread linear moving platform 303, a stepping motor 304, an objective lens 206, a compensator 4, an analyzer 204, a beam splitter 207, an eyepiece 208, a CCD5, a computer 6 and a multi-core fiber 001 to be measured, wherein the laser light source 101 is connected with the laser collimator 102 to enable the central wavelength of the laser light source 101 to be 1310nm, laser enters a light path through the reflector 201 and sequentially passes through the attenuator 202, the polarizer 203, the lens group 205, the stage 301, the matching liquid pool 302, the fiber 001 to be measured, the objective lens 206, the compensator 4, the analyzer 204, the beam splitter 207, the eyepiece 208 and the CCD5 to form a complete fiber refractive index distribution and internal stress comprehensive measurement device.
The attenuator 202 attenuates the laser source energy to protect the CCD5 camera and extend its useful life.
The lens assembly 205 converges the laser light at the optical fiber 001 to be tested in the matching liquid pool 302.
The matching liquid pool 302 is arranged on the objective table 301, the height of the matching liquid pool 302 is 3cm, 90-degree-angle V-shaped grooves with the depth of 1.5cm are respectively formed in two ends of the matching liquid pool and used for placing optical fibers 001 to be detected, the center of the optical fibers 001 to be detected is aligned with the center of the matching liquid pool 302, and the optical fibers 001 to be detected are completely immersed in the matching liquid.
The high-precision short-thread linear moving platform 303 is connected with the objective table 301, the objective table 301 is controlled to defocus in a positive and a negative weak mode at the micro displacement of 1 micron magnitude, light intensity distribution images at different positions are obtained through the CCD5, and the light intensity distribution images are processed by the computer 6 to obtain refractive index distribution images.
One end of the optical fiber 001 to be measured is connected with the stepping motor 304, the stepping motor 304 controls the optical fiber 001 to be measured to rotate 180 degrees with 1 degree as precision, the optical path difference under different angles is obtained through the CCD5, and an internal stress distribution image is obtained after the optical path difference is processed by the computer 6.
The compensator 4 is provided with a rotating device, so that the compensator 4 can rotate 360 degrees at an angle smaller than 1 degree, and the compensator 4 can be detached from the rotating device and is only used for measuring the internal stress of the optical fiber.
The CCD5 camera can generate high precision grayscale images and data that are sent to the computer 6 for post processing.
EXAMPLE III
In this example, an integrated measuring apparatus for optical fiber refractive index and internal stress distribution based on QPM and BKC techniques includes:
the device comprises a laser light source 101, a laser collimator 102, a reflector 201, an attenuator 202, a polarizer 203, a lens group 205, a stage 301, a matching liquid pool 302, a high-precision short-thread linear moving platform 303, a stepping motor 304, an objective lens 206, a compensator 4, an analyzer 204, a beam splitter 207, an eyepiece 208, a CCD5, a computer 6 and a photonic crystal fiber 001 to be measured, wherein the laser light source 101 is connected with the laser collimator 102 so that the central wavelength of the laser light source 101 is 1310nm, laser enters a light path through the reflector 201 and sequentially passes through the attenuator 202, the polarizer 203, the lens group 205, the stage 301, the matching liquid pool 302, the fiber 001 to be measured, the objective lens 206, the compensator 4, the analyzer 204, the beam splitter 207, the eyepiece 208 and the CCD5 to form a complete fiber refractive index distribution and internal stress comprehensive measurement device.
The attenuator 202 attenuates the laser source energy to protect the CCD5 camera and extend its useful life.
The lens assembly 205 converges the laser light at the optical fiber 001 to be tested in the matching liquid pool 302.
The matching liquid pool 302 is arranged on the objective table 301, the height of the matching liquid pool 302 is 1m, two 90-degree-angle V-shaped grooves with the depth of 0.5m are respectively formed in two ends of the matching liquid pool and used for placing the optical fiber 001 to be detected, the center of the optical fiber 001 to be detected is aligned with the center of the matching liquid pool 302, and the optical fiber 001 to be detected is completely immersed in the matching liquid.
The high-precision short-thread linear moving platform 303 is connected with the objective table 301, the objective table 301 is controlled to defocus in a positive and a negative weak mode at a micro displacement of 10 micrometers, light intensity distribution images at different positions are obtained through the CCD5, and the light intensity distribution images are processed by the computer 6 to obtain a refractive index distribution image.
One end of the optical fiber 001 to be measured is connected with the stepping motor 304, the stepping motor 304 controls the optical fiber 001 to be measured to rotate 180 degrees with the precision of 10 degrees, the optical path difference under different angles is obtained through the CCD5, and an internal stress distribution image is obtained after the optical path difference is processed by the computer 6.
The compensator 4 is provided with a rotating device, so that the compensator 4 can rotate 360 degrees at an angle smaller than 10 degrees, and the compensator 4 can be detached from the rotating device and is only used for measuring the internal stress of the optical fiber.
The CCD5 camera can generate high precision grayscale images and data that are sent to the computer 6 for post processing.
Claims (8)
1. A comprehensive measurement device for optical fiber refractive index and internal stress distribution based on QPM and BKC technologies is characterized in that: comprises a laser light source (101), a laser collimator (102), a reflector (201), an attenuator (202), a polarizer (203), a lens group (205), an objective table (301), a matching liquid pool (302), a high-precision short-thread linear moving platform (303), a stepping motor (304), an objective lens (206), a compensator (4), an analyzer (204), a beam splitter (207), an eye lens (208), a CCD (5), a computer (6) and a fiber to be detected (001), wherein the laser light source (101) is connected with the laser collimator (102) to enable laser to enter a light path through the reflector (201) and sequentially pass through the attenuator (202), the polarizer (203), the lens group (205), the objective table (301), the matching liquid pool (302), the fiber to be detected (001), the objective lens (206), the compensator (4), the analyzer (204), the beam splitter (207), the eye lens (208) and the CCD (5), forming a complete optical fiber refractive index distribution and internal stress comprehensive measuring device.
2. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: the attenuator (202) attenuates the laser source energy to protect the CCD (5) camera and extend its useful life.
3. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: the lens group (205) converges the laser at the optical fiber (001) to be detected in the matching liquid pool (302).
4. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: the matching liquid pool (302) is arranged on the objective table (301), two ends of the matching liquid pool are respectively provided with a 90-degree angle V-shaped groove for placing the optical fiber (001) to be tested, the center of the optical fiber (001) to be tested is aligned with the center of the matching liquid pool (302), and the optical fiber (001) to be tested is completely immersed in the matching liquid.
5. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: the high-precision short-thread linear moving platform (303) is connected with the objective table (301), the objective table (301) is controlled to defocus positively, negatively and weakly at the micro-displacement of micron magnitude, light intensity distribution images at different positions are obtained through the CCD (5), and then the refractive index distribution images are obtained after the light intensity distribution images are processed by the computer (6).
6. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: one end of the optical fiber (001) to be detected is connected with the stepping motor (304), the optical fiber (001) to be detected is controlled by the stepping motor (304) to rotate for 180 degrees, optical path differences under different angles are obtained through the CCD (5), and an internal stress distribution image is obtained after the optical fiber is processed by the computer (6).
7. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: the compensator (4) is provided with a rotating device, so that the compensator (4) can rotate 360 degrees, and the compensator (4) can be detached from the rotating device and is only used for measuring the internal stress of the optical fiber.
8. The integrated measuring device of the refractive index and internal stress distribution of the optical fiber based on QPM and BKC technology as claimed in claim 1, wherein: the CCD (5) camera can generate high-precision gray value images and data and transmit the high-precision gray value images and data into the computer (6) for post-processing.
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| CN109883652A (en) * | 2019-03-29 | 2019-06-14 | 北京交通大学 | Optical fibre refractivity and internal stress measuring device based on QPM and BKC technology |
| CN112284690A (en) * | 2020-10-28 | 2021-01-29 | 山东省科学院激光研究所 | Testing device for accurately measuring distribution of distributed radial refractive indexes of optical fibers |
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| CN109883652A (en) * | 2019-03-29 | 2019-06-14 | 北京交通大学 | Optical fibre refractivity and internal stress measuring device based on QPM and BKC technology |
| CN112284690A (en) * | 2020-10-28 | 2021-01-29 | 山东省科学院激光研究所 | Testing device for accurately measuring distribution of distributed radial refractive indexes of optical fibers |
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