Remote vibration measurement of rough surfaces by laser interferometry

Details Remote vibration measurement of rough surfaces by laser interferometry Remote vibration measurement of rough surfaces by laser interferometry

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apopt..14.1621b&link_type=abstract

Applied Optics, vol. 14, July 1975, p. 1621-1626.

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Applications

6

Interferometry, Laser Applications, Remote Sensors, Surface Roughness, Vibration Measurement, Backscattering, Doppler Effect, Frequency Shift, Helium-Neon Lasers, Instrument Errors, Laser Outputs, Light Scattering, Noise Spectra, Optical Measuring Instruments, Transient Response

Scientific paper

A He-Ne laser interferometer employing a focusing telescope is used remotely to measure transient longitudinal displacements of rough surfaces by monitoring the resulting Doppler shift of the backscattered light. The feasibility and accuracy of this technique are considered theoretically relative to laser output, range, telescope aperture, sensor efficiency, bandwidth, noise, surface characteristics, and coherence. The technique was successfully demonstrated on various test surfaces at distances up to 100 m using an unstabilized 4-mW laser, a 15-cm reflector telescope, and a PIN photodiode.

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