Abstract

An optical field coherence function of composite speckle field in torsional vibration of aeroengine based on Doppler principle is obtained. Meanwhile, according to the relation between optical field coherence function and optical intensity coherence function, the optic field coherence function of composite speckle field as well as the coherence function of output current of photodetector is derived. Through carrying out the Fourier transformation of the optical intensity coherence function of composite speckle field, the power spectrum distribution of signal in torsional vibration of aeroengine is determined. In the case of the best measuring accuracy, the optimum laser spot radius is inferred.

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