CN110907141A - Fast slow axis direction detection device - Google Patents
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Abstract
本发明涉及四分之一波片的检测领域，具体涉及一种快慢轴方向检测装置。包括依次设置的偏振光输入模块、偏振片和光检测模块，所述待检测四分之一波片设置在偏振光输入模块和偏振片之间。本发明的有益效果在于，与现有技术相比，本发明通过一种快慢轴方向检测装置，只为了快慢轴方向的检测，识别出待检测四分之一波片安装方向是否正确，抛弃其他功能，使功能更单一，满足用户的特定需求；同时，操作更简单，人力成本低，整个装置结构也简单，成本低，后期维护难度低，适用于大规模推广使用；以及，专用于特定设置的检测物，即检测光芯片上待检测四分之一波片，只有正确安装和错误安装，检测成功率非常高。
The invention relates to the field of quarter wave plate detection, in particular to a fast and slow axis direction detection device. It includes a polarized light input module, a polarizer and a light detection module arranged in sequence, and the quarter-wave plate to be detected is arranged between the polarized light input module and the polarizer. The beneficial effect of the present invention is that, compared with the prior art, the present invention uses a fast and slow axis direction detection device to identify whether the installation direction of the quarter-wave plate to be detected is correct only for the detection of the fast and slow axis directions, and discard other function, to make the function more single, to meet the specific needs of users; at the same time, the operation is simpler, the labor cost is low, the structure of the whole device is also simple, the cost is low, and the difficulty of later maintenance is low, which is suitable for large-scale promotion and use; and, dedicated to specific settings The detection object, that is, the quarter-wave plate to be detected on the detection optical chip, only has correct installation and incorrect installation, and the detection success rate is very high.
Description
Technical Field
The invention relates to the field of detection of quarter-wave plates, in particular to a fast-slow axis direction detection device.
Background
The quarter-wave plate is mounted on the optical chip to form a product, but the quarter-wave plate is easy to send out the misloading direction. The existing quarter wave plate measuring instrument is mainly used for measuring the large-size wave plate in the free space, has complex functions, high cost, troublesome operation and large volume, and is not suitable for the scale detection of the quarter wave plate on a production line.
Disclosure of Invention
The invention provides a fast-slow axis direction detection device, which aims to solve the technical problems that the existing quarter-wave plate measurement instrument is mainly used for measuring a free space large-size wave plate, has complex functions, high cost, troublesome operation and large volume and is not suitable for large-scale detection of the quarter-wave plate on a production line.
The technical scheme adopted by the invention for solving the technical problems is as follows: the fast and slow axis direction detection device is used for detecting the fast and slow axis direction of a quarter-wave plate to be detected on an optical chip and comprises a polarized light input module, a polarizing plate and an optical detection module which are sequentially arranged, wherein the quarter-wave plate to be detected is arranged between the polarized light input module and the polarizing plate; the polarized light input module generates circularly polarized light and emits the circularly polarized light to the quarter-wave plate to be detected to form linearly polarized light in a polarization direction and emits the linearly polarized light to the polarizer, and the polarizer only allows the linearly polarized light formed by the quarter-wave plate to be detected which is correctly or wrongly installed in the fast and slow axis direction to be received by the light detection module.
Wherein, the preferred scheme is: the processor is connected with the light detection module and judges whether the quarter-wave plate to be detected is installed correctly or not according to the stored information of the memory.
Wherein, the preferred scheme is: the polarized light input module comprises a polarization maintaining laser, a polarization maintaining optical fiber and an output quarter wave plate, wherein the polarization maintaining laser provides a linear polarized light source, transmits the linear polarized light through the polarization maintaining optical fiber and forms circularly polarized light through the output quarter wave plate.
Wherein, the preferred scheme is: and the surface of the inserting core of the polarization maintaining optical fiber is attached to the output quarter-wave plate.
Wherein, the preferred scheme is: the fast and slow axis direction of the output quarter-wave plate and the panda eye direction of the polarization maintaining fiber form an angle of 45 degrees.
Wherein, the preferred scheme is: the fast and slow axis direction of the detection quarter-wave plate when the detection quarter-wave plate is correctly installed is vertical to the fast and slow axis direction of the output quarter-wave plate, and the polaroid only allows linear polarization in which the fast and slow axis directions are the same as the fast and slow axis directions of the output light source of the polarization maintaining laser to pass; or the fast-slow axis direction of the detection quarter-wave plate when the detection quarter-wave plate is correctly installed is consistent with the fast-slow axis direction of the output quarter-wave plate, and the polaroid only allows linear polarization of which the fast-slow axis direction is perpendicular to the fast-slow axis direction of the output light source of the polarization maintaining laser.
Wherein, the preferred scheme is: and a collimating lens is arranged between the output quarter-wave plate and the quarter-wave plate to be detected.
Wherein, the preferred scheme is: the polarization maintaining laser is a 1550nm polarization maintaining laser.
Wherein, the preferred scheme is: the optical detection module comprises a photodetector or a frequency doubling light sensitive sheet.
Wherein, the preferred scheme is: the optical chip is a planar optical waveguide chip.
Compared with the prior art, the detection device for the direction of the fast and slow axes has the advantages that whether the installation direction of the quarter-wave plate to be detected is correct or not is identified only for the detection of the direction of the fast and slow axes, and other functions are abandoned, so that the function is single, and the specific requirements of users are met; meanwhile, the operation is simpler, the labor cost is low, the whole device is simple in structure, low in cost and low in later maintenance difficulty, and the device is suitable for large-scale popularization and use; and the detection object specially used for specific arrangement, namely the quarter wave plate to be detected on the detection optical chip, is only correctly installed and wrongly installed, so that the detection success rate is very high.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a fast-slow axis direction detection device according to the present invention;
FIG. 2 is a schematic diagram of the structure of the fast-slow axis direction detection device based on the processor of the present invention;
FIG. 3 is a schematic structural diagram of a polarized light input module according to the present invention;
FIG. 4 is a schematic diagram of a first embodiment of optical paths of the apparatus for detecting the direction of the fast and slow axes according to the present invention;
FIG. 5 is a schematic diagram of a first embodiment of optical paths of the fast-slow axis direction detection apparatus according to the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a preferred embodiment of the fast and slow axis direction detecting device.
A fast-slow axis direction detection device is used for detecting the fast-slow axis direction of a quarter-wave plate 220 to be detected on an optical chip 210, and comprises a polarized light input module 110, a polarizer 120 and an optical detection module 130 which are sequentially arranged, wherein the quarter-wave plate 220 to be detected is arranged between the polarized light input module 110 and the polarizer 120; the polarized light input module 110 generates circularly polarized light and transmits the circularly polarized light to the quarter-wave plate 220 to be detected, so as to form linearly polarized light in a polarization direction and transmits the linearly polarized light to the polarizer 120, and the polarizer 120 only allows the linearly polarized light formed by the quarter-wave plate 220 to be detected which is correctly or incorrectly installed in the fast-slow axis direction to be received by the light detection module 130.
The polarization state of the output polarized light is changed through the quarter-wave plate 220 to be detected, so that the fast and slow axis directions of the linearly polarized light of the quarter-wave plate 220 to be detected which is correctly installed and the linearly polarized light of the quarter-wave plate 220 to be detected which is wrongly installed are different, and only the linearly polarized light in the fast and slow axis directions is allowed to pass through the polarizer 120, so that whether the quarter-wave plate 220 to be detected is correctly installed or not is identified. Only for the detection of the direction of the fast and slow axes, namely whether the installation direction of the quarter-wave plate 220 to be detected is correct or not is identified, other functions are abandoned, so that the functions are more single, and the specific requirements of users are met; meanwhile, the operation is simpler, the labor cost is low, the whole device is simple in structure, low in cost and low in later maintenance difficulty, and the device is suitable for large-scale popularization and use; and, the detection object specially used for the specific setting, namely the quarter wave plate 220 to be detected on the detection light chip 210, is only installed correctly and installed incorrectly, and the detection success rate is very high.
In this embodiment, and referring to fig. 2, the processor 140 and the memory, the memory stores a first condition indicating that the installation is correct and a second condition indicating that the installation is incorrect, the first condition and the second condition match that the optical detection module 130 receives the optical signal or does not receive the optical signal, the processor 140 is connected to the optical detection module 130, and determines whether the quarter-wave plate 220 to be detected is installed correctly or not according to the stored information of the memory.
Specifically, a preferred embodiment is provided. The polarizer 120 only allows linear polarization formed by the quarter wave plate 220 to be detected which is correctly installed in the fast and slow axis direction, the light detection module 130 is connected with the processor 140, when the light detection module 130 detects a light signal, the detection signal is sent to the processor 140, when the processor 140 receives the detection signal within a preset time, the memory is queried, and a first condition corresponding to the detection signal in a matching manner is obtained, that is, the quarter wave plate 220 to be detected is correctly installed. Subsequently, the user can know that the quarter-wave plate 220 to be detected is correctly installed through interactive functional modules such as an indicator light, a display or a power amplifier. The whole device realizes intelligent identification, has simple integral structure, simple manufacture and maintenance, low cost and high detection efficiency, and is a detection device with very high cost performance.
In this embodiment, the light detection module 130 includes a photodetector or a frequency doubling photosensitive film. The principle of the optical detector is that the conductivity of an irradiated material is changed due to radiation, so that whether an optical signal is received or not is obtained; based on the photoelectric effect, the thermal detector absorbs the optical radiation energy based on the material, then the temperature rises, thereby changing the electrical property of the thermal detector. The frequency doubling photosensitive piece can be observed from the outside, whether an optical signal is received or not can be known through the brightness of the frequency doubling photosensitive piece, and the frequency doubling photosensitive piece is more suitable for manual operation and can be used by combining with image processing equipment.
In this embodiment, the optical chip 210 is a planar optical waveguide chip. The planar optical waveguide chip can be used in a coherent receiver and can also be used in other wavelength division multiplexing devices such as an AWG (arrayed waveguide grating) and the like.
As shown in fig. 3, the present invention provides a preferred embodiment of the fast and slow axis direction detecting device.
The polarized light input module 110 includes a polarization maintaining laser 111, a polarization maintaining fiber 112 and an output quarter wave plate 114, wherein the polarization maintaining laser 111 provides a linearly polarized light source and is subjected to polarization maintaining.
The transmission of the fiber, through the output quarter wave plate 114, forms circularly polarized light.
Specifically, a linearly polarized light source is generated in the polarization maintaining laser 111, the polarization maintaining fiber 112 transmits linearly polarized light, and the polarization maintaining fiber 112 can solve the problem of polarization state change, but cannot eliminate the birefringence phenomenon in the fiber, and on the contrary, through the design of the geometric dimension of the fiber, a stronger birefringence effect is generated to eliminate the influence of stress on the polarization state of incident light. Therefore, the linearly polarized light passes through the output quarter wave plate 114 to form circularly polarized light, and is incident on the quarter wave plate 220 to be detected.
In this embodiment, the surface of the ferrule 113 of the polarization maintaining fiber 112 is attached to the output quarter-wave plate 114. The ferrule 113 is a connector, and is a detachable and classified optical fiber connector, so that the connection, conversion and scheduling of the optical channel are more flexible, and the optical communication system can be debugged and maintained. The surface of the ferrule 113 of the polarization maintaining fiber 112 is attached to the output quarter wave plate 114, so that the whole structure is more compact, and the polarization maintaining fiber 112 and the output quarter wave plate 114 are integrally arranged, so that the optical path transmission is more stable.
Preferably, the fast and slow axis directions of the output quarter wave plate 114 are at an angle of 45 degrees to the panda eye direction of the polarization maintaining fiber 112. The purpose is to match with the quarter wave plate 220 to be detected on the optical chip 210, so that the fast and slow axis directions of the linear polarization light forming the incident light detection module 130 have larger difference, and the detection result accuracy degree of the whole device is improved. Specifically, the fast-slow axis direction of the quarter-wave plate 220 to be detected when the quarter-wave plate is correctly installed is perpendicular to the fast-slow axis direction of the output quarter-wave plate 114, and the polarizer 120 only allows linear polarization in which the fast-slow axis direction is the same as the fast-slow axis direction of the output light source of the polarization maintaining laser 111; alternatively, the fast-slow axis direction of the quarter-wave plate 220 to be detected when the quarter-wave plate is correctly installed is the same as the fast-slow axis direction of the output quarter-wave plate 114, and the polarizer 120 only allows linear polarization with the fast-slow axis direction perpendicular to the fast-slow axis direction of the output light source of the polarization maintaining laser 111.
More specifically, referring to fig. 4 and fig. 5, the fast-slow axis direction of the output quarter-wave plate 114 forms an angle of 45 degrees with the panda eye direction of the polarization maintaining fiber 112, which is a clockwise 45 degree angle, the fast-slow axis direction of the to-be-detected quarter-wave plate 220 when being correctly installed is perpendicular to the fast-slow axis direction of the output quarter-wave plate 114, and the linear polarization 310 incident to the output quarter-wave plate 114 is perpendicular to form a circularly polarized light 320, and the linear polarization 330 output by the to-be-detected quarter-wave plate 220 is also perpendicular to the direction; and the fast-slow axis direction of the quarter wave plate 220 to be detected when the quarter wave plate is installed incorrectly is consistent with the fast-slow axis direction of the output quarter wave plate 114, the linearly polarized light 310 incident to the output quarter wave plate 114 is in the vertical direction to form circularly polarized light 320, and the linearly polarized light 340 output by the quarter wave plate 220 to be detected is in the horizontal direction. And, the polarizing plate 120 allows passage of linearly polarized light in a vertical direction.
In the present embodiment, a collimating lens 150 is disposed between the output quarter-wave plate 114 and the quarter-wave plate 220 to be detected. The collimating lens 150 is an instrument capable of transforming the light from each point in the aperture stop into a parallel collimated light beam, and if the output quarter-wave plate 114 and the quarter-wave plate 220 to be detected are close enough, the collimating lens 150 is not required.
In this embodiment, the polarization maintaining laser 111 is a 1550nm polarization maintaining laser. The method has the following advantages: 1. high power, short pulses; 2. high beam quality; 3. the reliability is high and the price is low; 4. volume size.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, but rather as embodying the invention in a wide variety of equivalent variations and modifications within the scope of the appended claims.
Claims (10)
1. The utility model provides a fast slow axis direction detection device for detect the fast slow axis direction of waiting to detect quarter wave plate on the optical chip which characterized in that: the device comprises a polarized light input module, a polaroid and a light detection module which are arranged in sequence, wherein the quarter-wave plate to be detected is arranged between the polarized light input module and the polaroid; the polarized light input module generates circularly polarized light and emits the circularly polarized light to the quarter-wave plate to be detected to form linearly polarized light in a polarization direction and emits the linearly polarized light to the polarizer, and the polarizer only allows the linearly polarized light formed by the quarter-wave plate to be detected which is correctly or wrongly installed in the fast and slow axis direction to be received by the light detection module.
2. The fast and slow axis direction detecting device according to claim 1, wherein: the processor is connected with the light detection module and judges whether the quarter-wave plate to be detected is installed correctly or not according to the stored information of the memory.
3. The fast and slow axis direction detecting device according to claim 1, wherein: the polarized light input module comprises a polarization maintaining laser, a polarization maintaining optical fiber and an output quarter wave plate, wherein the polarization maintaining laser provides a linear polarized light source, transmits the linear polarized light through the polarization maintaining optical fiber and forms circularly polarized light through the output quarter wave plate.
4. The fast and slow axis direction detecting device according to claim 3, wherein: and the surface of the inserting core of the polarization maintaining optical fiber is attached to the output quarter-wave plate.
5. The fast-slow axis direction detection device according to claim 3 or 4, wherein: the fast and slow axis direction of the output quarter-wave plate and the panda eye direction of the polarization maintaining fiber form an angle of 45 degrees.
6. The fast and slow axis direction detecting device according to claim 5, wherein: the fast and slow axis direction of the detection quarter-wave plate when the detection quarter-wave plate is correctly installed is vertical to the fast and slow axis direction of the output quarter-wave plate, and the polaroid only allows linear polarization in which the fast and slow axis directions are the same as the fast and slow axis directions of the output light source of the polarization maintaining laser to pass; or the fast-slow axis direction of the detection quarter-wave plate when the detection quarter-wave plate is correctly installed is consistent with the fast-slow axis direction of the output quarter-wave plate, and the polaroid only allows linear polarization of which the fast-slow axis direction is perpendicular to the fast-slow axis direction of the output light source of the polarization maintaining laser.
7. The fast and slow axis direction detecting device according to claim 3, wherein: and a collimating lens is arranged between the output quarter-wave plate and the quarter-wave plate to be detected.
8. The fast and slow axis direction detecting device according to claim 3, wherein: the polarization maintaining laser is a 1550nm polarization maintaining laser.
9. The fast and slow axis direction detecting device according to claim 1, wherein: the optical detection module comprises a photodetector or a frequency doubling light sensitive sheet.
10. The fast and slow axis direction detecting device according to claim 1, wherein: the optical chip is a planar optical waveguide chip.
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| CN201911237218.8A CN110907141B (en) | 2019-12-05 | 2019-12-05 | A fast and slow axis direction detection device |
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| CN201911237218.8A CN110907141B (en) | 2019-12-05 | 2019-12-05 | A fast and slow axis direction detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115508058A (en) * | 2022-11-22 | 2022-12-23 | 杭州微纳智感光电科技有限公司 | Device and method for detecting optical axis angle of polarizing film for display screen |
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| US20170038267A1 (en) * | 2015-06-10 | 2017-02-09 | University Of Southern California | Portable polarimetric fiber stress sensor system for visco-elastic and biomimetic material analysis |
| CN106950038A (en) * | 2017-04-10 | 2017-07-14 | 曲阜师范大学 | A kind of wave plate fast and slow axis detection method |
| CN211784200U (en) * | 2019-12-05 | 2020-10-27 | 深圳新飞通光电子技术有限公司 | Fast slow axis direction detection device |
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| CN103278310A (en) * | 2013-05-06 | 2013-09-04 | 北京航空航天大学 | Device and method for measuring phase delay temperature characteristic of optical fiber quarter wave plate |
| US20170038267A1 (en) * | 2015-06-10 | 2017-02-09 | University Of Southern California | Portable polarimetric fiber stress sensor system for visco-elastic and biomimetic material analysis |
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| CN106950038A (en) * | 2017-04-10 | 2017-07-14 | 曲阜师范大学 | A kind of wave plate fast and slow axis detection method |
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| CN115508058A (en) * | 2022-11-22 | 2022-12-23 | 杭州微纳智感光电科技有限公司 | Device and method for detecting optical axis angle of polarizing film for display screen |
| CN115508058B (en) * | 2022-11-22 | 2023-03-31 | 杭州微纳智感光电科技有限公司 | Device and method for detecting optical axis angle of polarizing film for display screen |
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