This paper presents a method to measure the in-plane displacement fields of curved surface bymoire interferometry of partial coherent light.The method has the following advantages:simple opticalsystem,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 ofthe method and the formulas of light intensity and displacement field,and introduces a replication techniqueto form a high frequency reflectance grating on the curved surface.The experiments achieved the measurementof 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 thetheoretical result.
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