This paper presents a measurement system that can measure micro displacement by laser interference and image process methods. The displacement is measured by testing the relative moving distance between the movable mirror and the fixed mirror. Based on Michelson interference theory, the interference stripe images produced by a monochromatic laser source is collected by the CCD, which is used in the system to track the motion of PZT. The curve of light distribution is analyzed and dealt by Fourier Transformation and Low-pass Filtering methods. Least Squares Fit method is used to get normal amplitude, angle frequency and phase of the curve of light distribution and account the change of phases. Appling this measuring system, the micro-displacement is measured and obtains good test results.

A new experiment method for investigating the flapping motion of micro helicopter blades is described. The method is an untouched approach, two laser beams are used to measure the flapping deflection, one is used as reference beam and another is used as detecting beam. The results show that the method of using laser beam is very simple comparing with the traditional blade-mounted sensors method, and also this untouched approach is reliable for the flapping measurement of the micro helicopter.

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