LED Polarimeter

Details LED Polarimeter LED Polarimeter

2006-06-13

2006-06-13

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

By polarized light examination

Reexamination Certificate

active

07061612

ABSTRACT:
An LED polarimeter is described which is suitable for measuring the stress in photoelastic materials. The polarimeter comprises a sequential arrangement of an LED light source, a first polarizer, a ¼ wave plate, and a second polarizer substantially aligned along a central axis. The relatively monochromatic LED light source essentially eliminates errors caused by chromatic abberations and heat damage to the polarizing film. Preferrably, the LED light source emits in the green region of the visible spectrum to take advantage of the sensitivity of the human eye to this part of the spectrum.

REFERENCES:
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patent: 2003/0227622 (2003-12-01), Priestley
patent: 2005/0148876 (2005-07-01), Endoh et al.
patent: 2005/0207943 (2005-09-01), Puzey
patent: WO 2004/021884 (2004-03-01), None

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