Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
David W. Johnston0
Date of Patent
June 13, 2006
0Patent Application Number
107116050
Date Filed
September 28, 2004
0Patent Citations Received
Patent Primary Examiner
Patent 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.
Timeline
No Timeline data yet.
Further Resources
No Further Resources data yet.