Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1984-07-06
1987-07-14
Buczinski, Stephen C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
356 27, 356 285, G01P 336
Patent
active
046799320
ABSTRACT:
A method of measuring the moving velocity of a linear object which is moving while vibrating, the method comprising the steps of illuminating the linear object with a flat laser beam having a width larger than the amplitude of vibration, the linear object moving in the direction of its length and vibrating perpendicular to the longitudinal direction; receiving the scattered light from the linear object by a photoelectric conversion device through a finite-sized elliptic or slit aperture disposed with the direction of its minor axis matching the direction of movement of the linear object; and cutting off the d.c. component of a speckle signal from the photoelectric conversion device, counting the number of zero-crossings per second of the resulting signal and converting the count value to a signal representing the longitudinal moving velocity of the linear object.
REFERENCES:
patent: 4312592 (1982-01-01), Sabater et al.
T. Asakura and N. Takai, "Dynamic Laser Speckles and Their Application To Velocity Measurements of the Diffuse Object", 1981, Appl. Phys. 25 179-194.
Hirose Hujio
Morishita Koji
Nakatsuka Nobuo
Nishimura Masahiro
Buczinski Stephen C.
Lewis Aaron J.
Omron Tateisi Electronics Co.
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