Construction of an optical porthole. Communication 3. The state of stress and strain and the strength of a flat glass element

Concerning the Determination of the Geometrical Parameters of the Optical Element of a Deep-Water Surveillance System

“…In addition, the selection of the material of the optical element should take into account: resistance to the chemical effects of seawater; the requirements for optical components, namely, high transparency in the spectral range used, the possibility of using known technologies for processing optical materials both for obtaining transparent surfaces (grinding hardness) and for imparting the required shape. Studies on this topic are presented in papers [1][2][3][4][5][6][15][16][17].…”