Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1977-03-21
1979-05-15
Buczinski, S. C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
250227, 356342, 350 9618, G01D 336
Patent
active
041545290
ABSTRACT:
A system for detecting a reflected light beam includes a source of coherent light such as a laser beam, an optical fiber spaced away from the source for receiving an incident beam of coherent light from the source at one end of the fiber, means for reflecting a portion of the incident beam back through at least a portion of the fiber to radiate a reflected beam which includes narrow angle signals having a beam width corresponding to that of the incident beam and wide angle signals having a beam width substantially wider than that of the incident beam, receiving means between the source and the optical fiber for receiving the reflected beam and having an optical aperture therein for transmitting the incident beam and the narrow angle signals in the reflected beam, and a projector lens between the receiving means and the optical fiber for directing the incident beam into the optical fiber and for directing the narrow angle signals in the reflected beam into the optical aperture of the receiving means. This system may be used as a velocimeter for determining the velocity of moving particles adjacent the opposite end of the optical fiber from the end that receives the incident light beam. The receiving means typically comprises a mirror for reflecting the wide angle portion of the reflected beam into a photoelectric transducer, or the receiving means may itself be a photoelectric transducer.
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T. Tanaka et al., Applied Optics, vol. 14, No. 1, p. 189, Jan. 1970.
N. Clark et al., Am. J. of Physics, vol. 38, No. 5, p. 575, May 1970.
Andrew Corporation
Buczinski S. C.
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