Infrared and Laser Engineering, Volume. 51, Issue 12, 20220204(2022)
Forced convection method for optical testing system with large aperture and long focal length
The horizontal optical testing system with large aperture and long focal length is extremely susceptible to the airflow disturbance, which will cause random dynamic changes in time and space of multiple physical quantities in the optical path, such as temperature, velocity and pressure. In particular, the spatial heterogeneity and temporal stability of temperature will directly affect the dynamic change of air refractive index, resulting in the degradation of the point spread function, the tilt of the wavefront and the change of the wavefront over time. In order to suppress the influence of airflow disturbance on the testing optical path and improve the testing accuracy, based on the Computational Fluid Dynamics (CFD), a forced convection method was proposed to improve the uniformity of the indoor temperature field, which can be used to determine the array mode and number of fans. The Peak to Valley (PV) of the temperature was adopted and the concept of maximum optical path differences was introduced to comprehensively evaluate the uniformity of the indoor temperature field. Verified by several groups of experiments, the forced convection scheme reduces the standard deviation of the astigmatism coefficient from
Get Citation
Copy Citation Text
Jun Zhang, Xuefei Gong. Forced convection method for optical testing system with large aperture and long focal length[J]. Infrared and Laser Engineering, 2022, 51(12): 20220204
Category: Photoelectric measurement
Received: Apr. 10, 2022
Accepted: --
Published Online: Jan. 10, 2023
The Author Email: