System for detecting ice or snow on surface which specularly ref

Details System for detecting ice or snow on surface which specularly ref System for detecting ice or snow on surface which specularly ref

1998-10-09

2000-05-30

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

356369, G08B 1902

Patent

active

06069565&

ABSTRACT:
A presence of a polarization altering substance on a specular surface is detected by transmitting light from a single strobed light source to the surface over a transmitting path and receiving the transmitted light from the surface. An intensity of the light is measured in both an optical non-isolator state and an isolator state by a same detector by delaying the non-isolated return light for a definite period of time before measuring it with the detector. The measured isolated and non-isolated intensities are converted to logarithmic form, range corrected, and compared to reference data established for the specific specular surface being investigated to detect the presence or absence of the polarization altering substance. Attenuation and backscattering effects of scattering and/or absorbing interference in the transmitted light are compensated so that the reference table is entered at the correct point. Using different intensities of transmitted light increases the dynamic range of the system.

REFERENCES:
patent: 3994586 (1976-11-01), Sharkins et al.
patent: 4164373 (1979-08-01), Schuss et al.
patent: 4701052 (1987-10-01), Schoen, Jr.
patent: 5243185 (1993-09-01), Blackwood
patent: 5500530 (1996-03-01), Gregoris
patent: 5557261 (1996-09-01), Barbour
patent: 5589822 (1996-12-01), Stern
patent: 5838239 (1998-11-01), Stern et al.

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