Abstract
In order to obtain high-quality multispectral optical camera images, the structural design of the optical window and the analysis of image quality are extremely important. In this paper, an optical window splicing scheme consisting of acrylic plate and BK7 optical glass is proposed to be applied in the hypersonic wind tunnel environment. The surface deformation and the evaluation metrics of imaging quality of optical windows are studied by thermal-structural-optical (TSO) integrated analysis under various settings. Theoretical and experimental analysis shows that the thickness of the extensive aperture splicing optical window with BK7 optical glass and acrylic plate should be at least 32.7 mm to maintain its functionality in a hypersonic wind tunnel environment. The influence of thermodynamics diminished when the optical window thickness reaches 35 mm. An optical window with such thickness meets the requirements of the working intensity and the image quality of a multi-spectral camera. This study serves as an essential reference for general optical window design.