Method and apparatus for measuring a relative movement between t

Details Method and apparatus for measuring a relative movement between t Method and apparatus for measuring a relative movement between t

1995-02-24

1996-07-30

Pham, Hoa Q.

Optics: measuring and testing

By polarized light examination

With light attenuation

356 285, 356358, G01B 902, G01P 336

Patent

active

055417329

ABSTRACT:
For measuring an amount of relative movement between two elements, such as a vehicle and a track, which are mutually movable, two successive pulses of coherent light are directed from the vehicle to the track under a same incidence angle. From a same location of the vehicle, two images of the interference patterns due to the short pulses are formed. The two pulses are offset from each other in the direction of movement by a distance d approximately corresponding to the amount of relative movement between the two pulses. The actual amount of movement is computed as being the movement which provides the best coincidence between the two images. The comparison can be made by cross-correlation.

REFERENCES:
patent: 3804517 (1974-04-01), Meyr et al.
patent: 3885873 (1975-05-01), Adermo
patent: 4162509 (1979-07-01), Robertson
patent: 4312592 (1982-01-01), Sabater et al.
patent: 4334779 (1982-06-01), Domey et al.
patent: 4413905 (1983-11-01), Holzapfel
patent: 4979818 (1990-12-01), Kobayashi
Industrial Laboratory, vol. 40, No. 10, Oct. 1, '74, Moscow pp. 1453-1454--Rakhlin et al "Opticomechanical method of Measuring the Rates of Diffusion of Streams of Free-Flowing Materials"--Whole document--FIG. 1 .

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