Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1983-08-16
1986-07-22
Levy, Stewart J.
Optics: measuring and testing
By particle light scattering
With photocell detection
356350, 73657, G01B 902, G01P 336
Patent
active
046015809
ABSTRACT:
A device for monitoring torsional vibrations in a rotary shaft comprises a laser source, a 50% transmission-reflection beamsplitter and a mirror arranged to provide two spaced parallel laser beams and which strike the surface of the shaft at points A and B respectively. Since the shaft surface is moving, light backscattered at the surface is Doppler shifted and since the velocity of the surface at points A and B differs, the frequency of light backscattered at the two points is shifted by different amounts. Light backscattered along the axes of the incident beams is mixed and directed into a detector where it heterodynes. The frequency at which the detected light intensity is modulated is directly proportional to the speed of rotation of the shaft. The device, and the method it embodies, can be used to measure the difference in velocity at two points on any surface undergoing non-uniform, motion and can, therefore, be used generally to characterize vibrational motion.
REFERENCES:
patent: 3782176 (1974-01-01), Jacobs
patent: 3796495 (1974-03-01), Laub
patent: 3879988 (1975-04-01), Jacobs
patent: 4347748 (1982-09-01), Pierson
patent: 4512661 (1985-04-01), Claus et al.
Chapman, Jr. John E.
Levy Stewart J.
University of Southampton
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