Tracking separation between an object and a surface using a...

Details Tracking separation between an object and a surface using a... Tracking separation between an object and a surface using a...

2007-03-13

2007-03-13

Le, Que T. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559240, C250S559380

Reexamination Certificate

active

10977720

ABSTRACT:
Tracking separation between an object and a surface involves illuminating the surface and reducing the collection angle of light that reflects off of the surface in response to a change in separation between the object and the surface. Reducing the collection angle of light that reflects off of the surface causes the amount of light that is detected to be dependent on the separation distance between the object and the surface. The amount of detected light is then used as an indication of the separation distance.

REFERENCES:
patent: 5644139 (1997-07-01), Allen et al.
patent: 5729009 (1998-03-01), Dandliker et al.
patent: 6222174 (2001-04-01), Tullis et al.
patent: 6642506 (2003-11-01), Nahum et al.
patent: 6747284 (2004-06-01), Bohn

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