Elliptical polarizers, tags and identification systems using...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C250S227170, C359S486010

Reexamination Certificate

active

07629569

ABSTRACT:
An optical combination includes a substrate, a linear polarizer on the substrate, and a first frequency selective surface (FSS) based elliptical polarization filter on the linear polarizer. The first FSS comprises at least one periodic pattern of spaced apart electrically conductive lines having a sub-wavelength line-to-line spacing orientated along a first axis. The pattern is operable to impose a phase differential for one orthogonal linear polarization state relative to the other linear polarization state for electromagnetic radiation having a wavelength between 400 nm and 1 mm, such as 1 μm to 12 μm. An identification system and associated method for identifying objects includes at least one tag having encoded information attached to the surface of an object to be identified, wherein the tag includes a first FSS-based elliptical polarization filter which provides the encoding. A remotely located receiver including a second FSS-based elliptical polarization filter and a linear polarizer optically coupled to the second filter is operable for differentially attenuating the first and second orthogonal polarization states allowing a determination whether the intensity pattern corresponds to the encoded information.

REFERENCES:
patent: 2003/0214456 (2003-11-01), Lynch et al.
patent: 2005/0045799 (2005-03-01), Deng et al.
patent: 2006/0227422 (2006-10-01), Monacelli et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Elliptical polarizers, tags and identification systems using... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Elliptical polarizers, tags and identification systems using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Elliptical polarizers, tags and identification systems using... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4141381

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.