Apparatus for detecting the amplitude, frequency or modes of vib

Details Apparatus for detecting the amplitude, frequency or modes of vib Apparatus for detecting the amplitude, frequency or modes of vib

1993-11-23

1996-05-14

Williams, Hezron E.

Measuring and testing

Vibration

Sensing apparatus

356374, 73579, G01H 900

Patent

active

055157300

ABSTRACT:
Apparatus for detecting at least one of the amplitude, frequency and modes of vibration of a panel is described. Detection is achieved using Moire fringes by employing two diffraction gratings (33 and 38) through the first of which light is projected on to the panel. An array of photodiodes (40) is positioned behind the second diffraction grating (38) which receives light reflected from the panel. Signals from the photodiodes are analyzed in conventional ways to produce the required amplitude, frequency and mode information.

REFERENCES:
patent: 3245307 (1966-04-01), Lang
patent: 3952150 (1976-04-01), Gerardin et al.
patent: 4051367 (1977-09-01), Sayce et al.
patent: 4125025 (1978-11-01), Suzuki et al.
patent: 4136568 (1979-01-01), Seymour
patent: 4978222 (1990-12-01), Drew et al.
patent: 5075562 (1991-12-01), Greivenkamp, Jr. et al.
patent: 5307152 (1994-04-01), Boehnlein et al.

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