Apparatus for detecting the presence and location of at least on

Details Apparatus for detecting the presence and location of at least on Apparatus for detecting the presence and location of at least on

1997-02-13

1998-09-08

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With light attenuation

250222, 2502221, G01B 1103

Patent

active

058052887

ABSTRACT:
An apparatus for detecting the presence of at least one object in a field having at least one through-beam detection device with at least one transmitter and at least one opposing detector to create a detection beam that overlaps the field.

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