Citation: | Gao Fei, Wang Miao. Double optical wedge optical axis pointing adjustment technology[J]. Opto-Electronic Engineering, 2018, 45(11): 180218. doi: 10.12086/oee.2018.180218 |
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Overview: A prism with a small refraction angle is called a wedge. Double optical wedges, also known as Risley prism pairs, are opto-mechanical components that consist of two closely spaced optical wedges with the same refractive index and equal angular refraction. Its main function is to adjust the optical axis by adjusting the rotation angle of the double wedge. In addition to the dual-optical wedge, which can realize the function of a single optical wedge, the relative motion of the two optical wedges can make the equivalent refraction angle of the two optical wedges change within a range of 0 to 2 single refraction angles of the single wedge, and select different rotation speeds and directions. One can get different scan patterns. Therefore, dual-optical wedges can form a flexible and diverse scanning format, and the structure is simple and easy to use. Based on the above advantages, bi-optic wedges are widely used in navigation systems, laser radar systems, satellite interactive systems, and laser micro-hole processing optical path control, high-precision angle generator.
When the double-wedge system is generally used, the rotation speed of the optical wedge is relatively stable and the control is relatively simple, and it is possible to realize the linear and petal-type trajectories; but when more complex trajectories are required, such as concentric circles and zigzags, this simple control method obviously cannot be achieved. In order to meet the needs of a certain product, optical axis adjustment trajectories of concentric circles and zigzags are realized. Based on the existing theories, this paper establishes the relationship between the optical axis deflection angle and the bi-wedge rotation degree model, and derives the corresponding formula. In combination with Matlab simulation, fitting and actual product testing, the dual-optical wedge using ARM and computer control is designed. To adjust the orientation of the optical axis. The results show that the error of the optical axis pointing adjustment of the scheme is less than 0.5°, and the expected trajectory can be achieved to meet the requirements of actual products. And the control method of the dual optical wedge controlled by the control system composed of ARM and stepper motor is given. The significance of this paper is to propose a new scheme for the traditional bi-wedge scanning method, and to give a realization method of concentric circles and zigzag scanning. And matlab simulation and actual test and experimental data analysis were carried out on the program. Through experimental analysis, we can see that the new program can meet the requirements of specific projects with high efficiency and time saving when facing different spot sizes. Based on the existing theory, this scheme is one of practical examples of dual-wedge scanning applications and concrete engineering, and extends the application range of dual-wedge scanning.
Double wedge vector model
Concentric scan pattern simulation
Circular spot scanning trace diagram
Fitting optimal result graph
Rectangle spot scanning trajectory diagram
Actual test device diagram