Abstract
This paper presents a method to measure the in-plane displacement fields of curved surface by moire interferometry of partial coherent light. The method has the following advantages: simple optical system, no requirement on vibration isolation, high sensitivity, large measuring range, high contrast of interference fringes and availability to in situ structural testing. the present paper also gives theoretical analysis of the method and the formulas of light intensity and displacement field, and introduces a replication technique to form a high frequency reflectance grating on the curved surface. The expriments achieved the measurement of the surface displacement field of a cylindrical shell— the simultaneous circumferential, axial and 45° displacement fields. The torsional test data for surface displacement of a circular bar agree well with the theoretical result.
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