Displacement information detecting apparatus and doppler velocim

Details Displacement information detecting apparatus and doppler velocim Displacement information detecting apparatus and doppler velocim

1995-04-10

1996-01-09

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356373, G01P 336

Patent

active

054833329

ABSTRACT:
A doppler velocimeter determines the velocity of an object moving through a beam intersection area by using a doppler frequency obtained by detecting light from the beam intersecting area. The doppler velocimeter includes: a light source; a diffraction grating for diffracting light received from the light source; first and second lens systems for transmitting diffracted light from the diffraction grating to irradiate a portion of a movable object to be examined, the first and second lens systems having the same focal length F; and a detector device for receiving light from the portion of the object irradiated with the light which has been transmitted through the first and second lens systems and for obtaining a doppler signal used for velocity determination. The interval between the first and second lens systems is twice as long as the focal length F. Spherical aberration caused by a portion of the first lens system through which the diffracted light travels is offset by spherical aberration caused by a portion of the second lens system through which the diffracted light travels. This simple construction achieves equidistant interference fringes over the beam intersection area.

REFERENCES:
patent: 5216478 (1993-06-01), Kadowaki et al.

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