Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1996-02-06
1997-04-01
Mullen, Thomas J.
Communications: electrical
Condition responsive indicating system
Specific condition
356369, G08B 1902
Patent
active
056170769
ABSTRACT:
A method and apparatus for detecting a presence of a polarization altering substance on a specular surface includes transmitting light to the surface over a transmitting path and receiving the transmitted light from the surface and from the polarization altering substance. An intensity of the light is measured in an optical non-isolator state and in an isolator state. The isolator and non-isolator state measurements are performed either sequentially or simultaneously. A difference in intensity between isolator and non-isolator states indicates an absence of the substance. A sameness in intensity between isolator and non-isolator states indicates a presence of the substance.
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Cornwell, Jr. et al., "Polarization-Sensitive Ice Detector for Rotary Wing Aircraft using Laser Diodes", NASA disclosure GSC 13391-1, Oct. 1990.
Mullen Thomas J.
Robotic Vision Systems Inc.
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