Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-03-03
1989-01-10
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
244134F, G08B 2100
Patent
active
047976608
ABSTRACT:
Apparatus and method using internal reflection of electromagnetic radiation to detect ice or water on pavements or other surfaces and to continuously measure the thickness of the accumulation. A prism which is transparent to pulses of electromagnetic radiation from an emitter is mounted in the pavement with an exposed prism surface flush with, and in the plane of the surface being monitored for the accumulation. Radiation from an emitter is directed at the exposed prism surface at an angle so that the radiation is totally reflected when the exposed surface is bare, but only partially reflected when there is an accumulation. Radiation detectors are positioned so that changes in the intensity of internally-reflected radiation are measured and interpreted to detect the onset of an accumulation, measure the thickness of the accumulation, distinguish accumulations of ice from accumulations of water, and distinguish accumulations of mud or dirt from accumulations of ice or water.
REFERENCES:
patent: 2359787 (1944-10-01), Peters et al.
patent: 3540025 (1970-11-01), Levin et al.
Mattern Jr. Roy E.
Swann III Glen R.
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