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Second harmonic measurement of multi-beam laser heterodyne with ultra-precision for the Young modulus

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Abstract

In order to improve the measurement accuracy of the Young modulus and signal processing speed of operation, this paper proposes a novel method of second harmonic measurement of multi-beam laser heterodyne for Young modulus, which is converted into the measurement of the length variation of Young modulus. Based on the combination of Doppler effect and heterodyne technology, loaded the information of length variation to the frequency difference of second harmonic of the multi-beam laser heterodyne signal by frequency modulation of the oscillating mirror, which is in the light path. Heterodyne signal frequency can be obtained by fast Fourier transform, and can obtain values of length variation accurately after the multi-beam laser heterodyne signal demodulation. This novel method is used to simulate measurement for Young modulus of wire under different mass by MATLAB, the obtained result shows that the relative measurement error of this method is just 0.03%.

© 2014 Optical Society of America

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