Proximity detector

Details Proximity detector Proximity detector

2008-03-04

2008-03-04

Punnoose, Roy M. (Department: 2886)

Optics: measuring and testing

Position or displacement

C356S624000

Reexamination Certificate

active

10579334

ABSTRACT:
Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source and a light detector adapted to receive resulting back-scattered light from the reference object when illuminated from the light source, whereby the intensity of back-scattered light to the light detector is utilized as a measure of said proximity. The target object comprises an optical device having a focal plane and being adapted to be illuminated by the light source. The axes of the light rays from the light source and the back-scattering to the light detector have mutually closely adjacent and substantially parallel or coincident portions. Said proximity corresponds to a distance (relative position) between the target object and the reference object wherein the reference object is located substantially at the focal plane.

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