30 May 2003 Multifrequency laser beam use in an interferometer vibration measuring system
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It was discussed the using multi-frequency YAG:Nd infrared laser for long range non-destructive acoustic vibration measuring system for structural modal analysis. It was shown both theoretically and experimentally that a coherent function of a laser with acousto-optic device has an oscillations with the period depending on a laser cavity length and a number of resonator modes. The advantages of using the acousto-optic devices in a tandem scheme were discussed. The adjustment of such system due to on-axis shift is suitable for object selection. It was shown that the coherence function has optimal form for selecting a transparent object on light beam trace and optical delay line for semiconductor laser with short resonator can tune on maximum of coherent function at long distance. Accordingly the mutli-frequency laser can be used in heterodyne optical scheme instead of more costly stable one-frequency laser. A simple scheme of velocity measuring based on a semiconductive two-mode laser was proposed. Conclusions regarding the possibility using the resonator with acousto-optic device inside with a frequency chirp beam using for interferometer phase modulation measure system are arrived at. The application of a frequency-shifted laser beam to practical optical measuring system may improve the processing efficiency without additional adjustments.
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Oksana P Budnyk, Oksana P Budnyk, Ruslan A Lymarenko, Ruslan A Lymarenko, } "Multifrequency laser beam use in an interferometer vibration measuring system", Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); doi: 10.1117/12.500282; https://doi.org/10.1117/12.500282

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