CN-121977793-A - Optical waveguide detection device and detection method

CN121977793ACN 121977793 ACN121977793 ACN 121977793ACN-121977793-A

Abstract

The invention discloses an optical waveguide detection device and an optical waveguide detection method, and belongs to the technical field of optical detection. The optical waveguide detection device comprises a projection module, an imaging detection module, a displacement module and a rotation driving module, wherein a lens is arranged on a corresponding port of the projection module and/or the imaging detection module, the lens comprises a first part and a second part which are close to the corresponding port, the first part is provided with a first optical axis, the second part is internally provided with an optical path turning element, the rotation driving module is used for driving the optical path turning element to rotate around the first optical axis, the displacement module is used for driving the projection module and/or the imaging detection module to move, and the displacement of the displacement module and the rotation of the optical path turning element enable the state to be switched.

Inventors

Wei Zhuxuan
LIU LUNING
ZHOU ZE
ZHENG ZENGQIANG
Ou changdong
LI YANGYANG
LIU RONGHUA
PENG JIAN

Assignees

武汉精测电子集团股份有限公司
武汉精立微光电有限公司

Dates

Publication Date: 20260505
Application Date: 20260325

Claims (11)

1. The optical waveguide detection device is characterized by comprising a projection module, an imaging detection module, a displacement module and a rotation driving module; the projection module and/or the imaging detection module are/is provided with a lens corresponding to the port, the lens comprises a first part and a second part which are close to the corresponding port, the first part is provided with a first optical axis, the second part is internally provided with a light path turning element, and the light path turning element can rotate around the corresponding first optical axis; the rotary driving module is used for driving the light path turning element to rotate around the corresponding first optical axis, so that the opposite setting direction of the exit pupil end of the projection module and the entrance pupil end of the imaging detection module is changed; the displacement module is used for driving the projection module and/or the imaging detection module to move so as to change the relative position between the projection module and the imaging detection module; The displacement of the displacement module and the rotation of the light path turning element enable the light waveguide detection device to be switched between a first working state and a second working state; The first working state is that an exit pupil end of the projection module is opposite to an entrance pupil end of the imaging detection module, and the projection module is directly coupled with an optical path of the imaging detection module; the second working state is that the exit pupil end of the projection module and the entrance pupil end of the imaging detection module are arranged in the same direction, and the projection module and the imaging detection module are indirectly coupled through the optical waveguide to be detected.
2. The optical waveguide detection device according to claim 1, wherein the lens is located on the projection module or the imaging detection module, and the rotation driving module is configured to drive the optical path turning element to rotate 180 ° around the corresponding first optical axis.
3. An optical waveguide detection arrangement according to claim 1, wherein the projection module and/or the corresponding port on the imaging detection module has the first portion fixedly arranged, and the second portion is rotatably mounted on the first portion.
4. An optical waveguide inspection apparatus according to claim 3 wherein said second portion is threadedly engaged with said first portion.
5. The optical waveguide detection device according to claim 1, wherein the rotation driving module is configured to drive the optical path turning element to rotate around the corresponding first optical axis, and includes: The projection module and/or the corresponding port on the imaging detection module is provided with a first part which is rotatably arranged, the second part is fixedly arranged on the first part, and the rotary driving module is used for driving the second part to rotate around the corresponding first optical axis so as to drive the corresponding optical path turning element to rotate.
6. The optical waveguide detection device according to claim 5, wherein a fixed sleeve is arranged on the projection module or the imaging detection module, the rotary driving module is a driving motor, the driving motor is located on the fixed sleeve, an output shaft of the driving motor is in transmission connection with a driving gear, the first portion is rotatably inserted into the fixed sleeve, a driven gear is sleeved on the peripheral wall of the first portion, and the driving gear is meshed with the driven gear.
7. The optical waveguide detection device according to claim 6, wherein a plurality of ball plungers are inserted in the fixing sleeve at intervals in the circumferential direction, each of the ball plungers is screw-fitted with the fixing sleeve, and the axial direction of each of the ball plungers is arranged in the radial direction of the fixing sleeve so as to push against the first part outer wall.
8. The optical waveguide detection device according to claim 6, wherein an induction piece is provided on the outer peripheral wall of the first portion, two sensors are provided on the fixing sleeve at intervals, the induction piece faces one of the sensors when the optical waveguide detection device is in the first operating state, and the induction piece faces the other of the sensors when the optical waveguide detection device is in the second operating state.
9. The optical waveguide detection device according to any one of claims 1 to 8, wherein the projection module comprises a fixedly connected light source for emitting detection light and a projection assembly for receiving the detection light and outputting an optical signal.
10. An optical waveguide detection arrangement according to any one of claims 1 to 8 wherein the optical path turning element is a prism or a mirror.
11. An optical waveguide detection method, wherein the optical waveguide detection device is based on the optical waveguide detection device according to any one of claims 1 to 10, the optical waveguide detection method comprising: The optical path turning element is driven by the rotary driving module to rotate, so that the opposite arrangement direction of the exit pupil end of the projection module and the entrance pupil end of the imaging detection module is changed, the projection module and/or the imaging detection module is driven by the displacement module to move, the exit pupil end of the projection module and the entrance pupil end of the imaging detection module are arranged opposite, and the optical waveguide detection device is in a first working state; Collecting system baseline parameters in the first working state; Providing an optical waveguide to be tested, wherein the rotary driving module drives the optical path turning element to rotate and reset so that the exit pupil end of the projection module and the entrance pupil end of the imaging detection module are arranged in the same direction, and the displacement module drives the projection module and/or the imaging detection module to move so that the optical waveguide detection device is in a second working state; acquiring optical performance parameters of the optical waveguide to be tested in the second working state; and acquiring the real optical performance parameters of the optical waveguide to be tested based on the optical performance parameters of the optical waveguide to be tested and the system baseline parameters.

Description

Optical waveguide detection device and detection method Technical Field The invention belongs to the technical field of optical detection, and particularly relates to an optical waveguide detection device and an optical waveguide detection method. Background In the AR (Augmented Reality ) near-eye display field, an optical system based on an optical waveguide has advantages of light weight, high efficiency, large angle of view, and the like, and is widely applied to near-eye display devices. The optical waveguide near-to-eye display device comprises an optical system composed of an optical machine and an optical waveguide, wherein the performance of the optical waveguide directly influences the image display quality of the near-to-eye display device, and the high-quality optical waveguide can ensure that an image provided by the optical machine is kept clear and original contrast in the transmission process, so that performance detection of the optical waveguide is vital in the production process. In the related art, in order to realize accurate assessment of waveguide performance, a system baseline detection (SLB) method is generally adopted in the industry, and the method has the core that before formally testing an optical waveguide sample, a projection module (an analog image source) of a detection machine and an imaging detection module (an image sensor) are directly optically coupled to obtain and record inherent performance parameters of a test system, and deviations introduced by the system can be removed from measurement data in subsequent waveguide tests, so that the actual performance index of the optical waveguide is accurately reflected. The main scheme for realizing direct coupling of the projection module and the imaging detection module is that the projection module is integrally rotated. However, the projection module has larger overall mass and size, and the rotation of the large module not only needs to reserve an arc-shaped movement space corresponding to the projection module, so that the equipment volume is increased, the compact and integrated design of a machine is not facilitated, but also needs a large-torque driving unit and a high-rigidity turntable, so that the manufacturing cost of the detection device is increased. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides the optical waveguide detection device and the detection method, which aim to conveniently realize the direct coupling of the projection module and the imaging detection module by rotating the light path turning element, so that the detection device is compactly and integrally designed, the manufacturing cost of the detection device is reduced, and the real performance index of the optical waveguide to be detected can be accurately reflected. In order to achieve the above object, in a first aspect, the present invention provides an optical waveguide detection device, which includes a projection module, an imaging detection module, a displacement module, and a rotation driving module; the projection module and/or the imaging detection module are/is provided with a lens corresponding to the port, the lens comprises a first part and a second part which are close to the corresponding port, the first part is provided with a first optical axis, the second part is internally provided with a light path turning element, and the light path turning element can rotate around the corresponding first optical axis; the rotary driving module is used for driving the light path turning element to rotate around the corresponding first optical axis, so that the opposite setting direction of the exit pupil end of the projection module and the entrance pupil end of the imaging detection module is changed; the displacement module is used for driving the projection module and/or the imaging detection module to move so as to change the relative position between the projection module and the imaging detection module; The displacement of the displacement module and the rotation of the light path turning element enable the light waveguide detection device to be switched between a first working state and a second working state; The first working state is that an exit pupil end of the projection module is opposite to an entrance pupil end of the imaging detection module, and the projection module is directly coupled with an optical path of the imaging detection module; the second working state is that the exit pupil end of the projection module and the entrance pupil end of the imaging detection module are arranged in the same direction, and the projection module and the imaging detection module are indirectly coupled through the optical waveguide to be detected. Optionally, the lens is located on the projection module or the imaging detection module, and the rotation driving module is configured to drive the optical path turning element to rotate 180 ° around the corresponding first opt