Improvement of the Method of Measuring In-plane, Normal Strain Using Interferometry of Diffraction Beams
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Methods of measurement using interference patterns of diffraction beams are effective in measurement of in-plane strains of plane surface of objects. This paper deals with a new method of measuring the first order derivatives of displacement. In this method an interferometer with a triangular, looped path is used and two beams producing an interference pattern pass the same, looped path clockwise and counter-clockwise respectively. Merits of this method compared with usual methods are as follows : (i) errors in interference fringes caused by unevenness of surface of mirrors, distortion of wavefront due to aberration of a collimator lens and non-uniformity of thickness of film (or specimen gratings) are compensated sufficiently for the practical purpose, (ii) diffraction beams of high order can be used and high sensitivity in measurement is achieved, (iii) the optical arrangement is simple and adjustment is easy, and (iv) the interference pattern is stable against shock or disturbance.
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