METHOD FOR DETERMINATION OF NORMAL SHIFTS OF BODY SURFACE Russian patent published in 2009 - IPC G01B11/16 

FIELD: physics.

SUBSTANCE: method for determination of normal shifts of body surface by shifts of interference strips includes preliminary shifting of one of parts in selected section of surface relative to the other one by normal line to surface by value that is more than length of laser radiation semi-wave used in creation of interference pattern. Registration of preliminary shifting of section points in memory and on screen of computer monitor in the form of interferogram with two and more interference strips that reflect lines of preliminary shift level. Determination of coordinates of interferogram strip centres in pixels of monitor screen, realisation of additional shifting in this section, measured normal component of which is low compared to preliminary shifting. Fixation of changes in positions of preliminary shifting interferogram strip centres without change in total number of registered strips and calculation of measured component of shifting w according to the following formula: where w is value of body shift by normal line to its surface, m; λ is length of wave of laser used in interferometre, m is number of strips of preliminary shifting interferogram used in calculation (m≥2); N is number of screen monitor pixels between centers of extreme strips from the accounted ones; n₁ is value of identical shift of extreme strip centres in pixels of screen monitor, which characterises shift of surface section between them as rigid integer; n₂ is value of relative shift between centres of extreme strips in pixels of screen monitor, which characterises relative shift with change of surface section inclination angle between strips compared to their levels for preliminary shift.

EFFECT: increased sensitivity and expansion of range of shift and inclination measurements.

4 dwg