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A laser displacement sensor using the self-mixing effect for modal analysis and defect detection

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3 Author(s)
Servagent, N. ; Ecole des Mines, Nancy, France ; Bosch, T. ; Lescure, M.

A low-cost, simple, noncontact displacement sensor using the self-mixing effect inside a cw single-mode laser diode has been developed for modal analysis and defect detection. The resonance frequencies of thin clamped metallic plates have been determined with a resolution of 0.2 Hz. With such targets, classic spectrum analyzers generate a measurement error up to 10% because of the weight of the accelerometer. The frequency-shift of the fundamental resonance frequency between a standard plate and the same one with a known defect can also be measured, the modal vector associated to this frequency being distorted at the place of the defect

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Instrumentation and Measurement, IEEE Transactions on  (Volume:46 ,  Issue: 4 )