The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 30, 1996
Filed:
Feb. 24, 1995
Philippe Forin, Montrouge, FR;
Matra Transport, Montrouge, FR;
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.