抄録
Two methods of displacement measurement of object with diffusing surface have been developed already.One is by speckle pattern interferometry method with wavelength order accuracy and a half wavelength measurement area, and another is by triangle method with micrometer order accuracy and a millimeter measurement range. We propose a method of complex displacement measurement by using the speckle pattern interferometry method and the triangle method. In both methods, measurement point on object surface is the same.In this paper, a calculation method used in the method of complex displacement measurement is described.The method make that displacement measurement of object with diffusing surface can be available with wavelength order accuracy and a millimeter measurement area.
