Measuring and testing – Vibration – Sensing apparatus
Patent
1977-10-21
1978-12-12
Queisser, Richard C.
Measuring and testing
Vibration
Sensing apparatus
356 5, G01H 900
Patent
active
041290410
ABSTRACT:
Ultrasonic waves present on the surface of a workpiece are received contact-free by an optical sensing arrangement which includes a frequency stabilized single mode laser which illuminates the vibrating surface portion. Reflected light from the illuminated portion, which light is frequency modulated by the Doppler effect of the ultrasonic wave, is collected by a lens and applied to a narrow band absorption light filter. The frequency of the laser and the filter are selected to cause the center frequency of the light to fall at a point along the steepest slope of the filter absorption curve. The change in light frequency causes a corresponding change in light intensity passing through the light filter and the filtered light, now amplitude modulated, is provided to photoelectric means. A feedback circuit maintains the frequency of the laser constant.
REFERENCES:
patent: 3355934 (1967-12-01), Foster
patent: 3952583 (1976-04-01), Rosati
patent: 4046477 (1977-09-01), Kaule
J. V. Foster, A Laser Device For Remote Vibration Measurement, IEEE Transactions on Aerospace and Electronic Systems, Mar. 1967, pp. 154-157.
Beauchamp John P.
Feig Philip J.
Krautkramer-Branson Incorporated
Queisser Richard C.
Steinberg Ervin B.
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