METHOD OF DETERMINATION OF MECHANICAL STRENGTH OF COAT ON SURFACE OF OPTICAL ELEMENT AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 1995 - IPC

FIELD: physical-chemical analysis. SUBSTANCE: invention refers to determination of strength of solid bodies. Method of determination of mechanical strength of coat on surface of optical element is based on fretting of coat surface by cyclic movement of fretting gear, on registration of infrared radiation caused by friction of fretting gear against coat surface and on determination of mechanical strength by number of cyclic movements of fretting gear. Surface is additionally irradiated with radiation in visible or infrared region of spectrum. Transmission coefficients of optical element with investigated coat with ratio of passed radiation K_st to coming radiation are determined before fretting and in process of fretting and mechanical strength is found by number of cycles of fretting gear with which in visible or infrared region of spectrum changes by 1.0 per cent in relation to K_st. Device implementing this method additionally includes sources of visible or infrared radiation, two modulators, additional register, two optical elements. One of modulators is optically coupled to source of radiation, to first input of first register and second modulator is ganged up to source of visible radiation and to first input of second register. EFFECT: improved authenticity of determination of mechanical strength. 2 cl, 1 dwg