Displacement information detection apparatus

Details Displacement information detection apparatus Displacement information detection apparatus

1992-12-21

1993-12-21

Hellner, Mark

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356 285, 356 4, 356 45, G01P 336

Patent

active

052725120

ABSTRACT:
An apparatus for detecting velocity of an object, includes a light source for generating light having a wavelength .lambda., a light-transmission block for receiving the light from the light source, and guiding the light onto the object, and a photosensor for detecting the light from the object on which the light from the light-transmission block is incident. The light-transmission block is integrally constituted by a diffraction grating for diffracting the light from the light source to produce two diffraction lights, and an optical element for causing the two diffraction lights from the diffraction grating to be incident onto the object at a predetermined incident angle. The diffraction grating and the optical element are arranged so as to have substantially constant sin.theta./.lambda. independently of a change in wavelength .lambda. of the light from the light source where .theta. is the incident angle of each diffraction light onto the object. A velocity of the object is detected through detection by the photosensor.

REFERENCES:
patent: 3744410 (1973-07-01), van Deelen
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patent: 3830568 (1974-08-01), Allen
patent: 4948257 (1990-08-01), Kaufman et al.
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patent: 4991963 (1991-02-01), Sutton
R. Battig, W. Hodel, R. Stierlin, & H. Weber, Probing a fluid through a distorting interface using a monostatic fiber-optic Doppler velocimeter, Applied Optics, No. 23, 1 Dec. 1988, pp. 4844-4849.
1987 Mitsubishi Semiconductor Data Book, Optical Semiconductor Element Edition (and partial translation of description of FIG. 6).
C. P. Wang, "Doppler Velocimeter Using Diffraction Grating and White Light", Applied Optics, vol. 13, No. 5, pp. 1193-1195 (May 1974).
W. Farmer, "Two-dimensional Bragg Cell LDV System Using Multiple Light Frequencies", Applied Optics, vol. 17, No. 2, pp. 166-168 (Jan. 1978).
Taylor & Francis Ltd., "Optical Acta", International Journal of Optics, vol. 9, No. 1, pp. 1-12 (Jan. 1962).

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