Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1987-07-15
1989-01-17
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
15250C, 250339, 250349, G01N 2141
Patent
active
047989564
ABSTRACT:
The invention is a moisture sensor which includes an emitter (18) to emit pulses of radiant energy toward the inside surface (14) of a window (12) at an incident angle (.theta.). The radiant energy is refracted into the window (12) at the air-inside window surface (14) and reflected off the air-outside window surface (16) back through the window (12). The radiant energy is then detected by a detector (20) at a reflection angle (.theta.') equal to the incident angle (.theta.). A support (22) spaces the emitter (18) and detector (20) a distance D between the intersection (I) of the axis (A) of the emitter (18) with the inside window surface (14) and the intersection (E) of the axis (B) of the detector (20) with the inside window surface (14) which is determined by the formula:
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Hannaher Constantine
Howell Janice A.
Milton Jr. Harold W.
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