PROCESS DETERMINING DISTANCE TO RADIATION SOURCE Russian patent published in 2002 - IPC

FIELD: optical measurements. SUBSTANCE: invention specifically refers to measurement of distance from radiation object to point light source. Process determining distance to radiation source S₀(S₁) includes formation of image S10

(S11) of radiation source with the use of optical system and matching of this image S10(S11) with dependence of response function of this optical system on distance to radiation source S₀(S₁) found in advance. In this case response of optical system is modified by means of amplitude-phase mask installed in path of rays which is formed with capability of deflection of these rays in direction mainly orthogonal to direction of deflection of rays caused by defocusing. Angle of turn of image S10(S11) of radiation source S10(S11) is evaluated by matching this image S₀(S₁) with specified response function. Optimally transmission coefficient of amplitude-phase mask should be set in the form of periodic function of angle of turn. In this case while evaluating angle of turn one determines change of phase of signal of formed image S10(S11) of radiation source S₀(S₁). EFFECT: increased accuracy and economy of measurements thanks to possibility of evaluation of distance to any point on surface of object and to reproduction of its form by single photograph of image of radiation object. 1 cl, 4 dwg _