Measuring vibrational frequency of vibratable pins

Details Measuring vibrational frequency of vibratable pins Measuring vibrational frequency of vibratable pins

1988-10-31

1989-07-25

Levy, Stewart J.

Measuring and testing

Vibration

Loose object detection

73588, 73657, 356349, G01N 2900

Patent

active

048502251

ABSTRACT:
Measuring vibrational frequency of a pin attached at one end by collimating two laser beams onto the pin and back scattering the beams. The back scattered frequency is modulated by doppler effect and is heterodyned with the original beam frequency to produce a signal representative of each modulating frequency. The representative signals are summed together and also subtracted from one another. The summed and subtracted signals are representative, one of the vibrational frequency of the pin and the other of the degree of focussing accuracy of each laser beam onto the pin.

REFERENCES:
patent: 3645129 (1972-02-01), Grant
patent: 4287766 (1981-09-01), Ensminger
patent: 4295375 (1981-10-01), Ganglbauer et al.
patent: 4569588 (1986-02-01), Nishiwaki et al.
patent: 4641527 (1987-02-01), Hiroi et al.
"Laser Doppler Vibration Measuring System Using Bispectral Analysis" by Osami Sasaki et al., Applied Optics, vol. 19, No. 1, Jan. 1980.
"A Laser Device for Remote Vibration Measurement" by John Foster, IEEE Trans. Aerospace & Electronic Systems, vol. AES-3, No. 2, Mar. '67.

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