Research On Detection Technology Of Diffusion Angle Of Laser Diffuser

As the 'brightest light' since the 20 th century,laser has the characteristics of small divergence angle and high brightness.When using a laser as a light source,a laser diffuser must be added to the laser emitting end.The laser diffuser is an optical element which can diffuse the collimated laser beam at a certain angle.The effective illumination region is an important parameter about the laser diffuser.It is the surface light source with the highest energy point as the center and 60% of the highest energy point as the boundary.The diffusion angle is the angle between the center and the boundary of the effective illumination region,which determines the size of the effective illumination area and reflects its diffusion ability.It is the most important parameter of the laser diffuser.Because the laser diffuser is a new field in our country,the diffusion angle detection technology is relatively backward.Manual detection has been used for a long time,which has low efficiency and large error.Therefore,it is of important significance to develop a set of automatic,high-efficiency and highprecision detection system for laser diffuser with different diffusion angles.In order to solve the above problems,this paper carried out the research work of laser diffusion angle detection technology.Firstly,the physical models of laser diffusers are established from the angle of geometrical optics and wave optics respectively,and the relationship between the diffusion angle and the microstructure parameters of the diffusers is solved.According to the Monte Carlo method,the laser diffuser is simulated and analyzed,and the simulation results are compared with the theoretical analysis results.The results show that the diffusion angle increases with the increase of the microstructure aperture and decreases with the increase of the curvature radius.Secondly,according to the requirements of technical indicators,the overall design scheme of the detection system is established,and the mechanical structure,hardware and program of the detection system are designed.In the mechanical design part,the structure design of the beam diffusion system,the beam receiving system and the control end of the system are completed;In the part of hardware and program,we use MCU control technology,signal conversion and transmission technology to control the detector pulse movement,collect the optical signal,and convert and transmit the optical signal.Finally,the detection system is built and debugged.The experimental results show that:in the high-efficiency detection mode,the detection distance is 2m,the sampling interval is0.5mm,the measurement accuracy can reach 0.1°,and the single measurement is 115s;In high-precision mode,the detection distance is 2m,the sampling interval is 0.3mm,the detection accuracy of the system reaches 0.02°,and the longest single measurement time is178 s.The automatic,high-efficiency,and high-precision detection of the diffusion angle of the diffuser is realized,and the technical index requirements of the project are met.