Dew point sensor

Details Dew point sensor Dew point sensor

1981-07-24

1984-03-06

Frankfort, Charles E.

Thermal measuring and testing

Transformation point determination

By change in optical property

733365, 73 29, G01N 2512

Patent

active

044350910

ABSTRACT:
An integrated circuit device is disclosed for sensing dew point which uses integrated circuit techniques supported on a suitable substrate. Four semi-conductor junctions are used which are a Peltier junction or a junction capable of emitting or absorbing heat, a light-emitting junction, a junction that generates electrical current when exposed to light and a temperature sensing junction. The circuit cooperates to control time and switch the current through the Peltier junction to heat and cool it. The light-emitting junction emits light onto the reflecting surface. The light sensing means senses the reflected light, and the Peltier junction selectively heats and cools the reflecting surface causing moisture to condense on the surface which changes the reflecting properties of the surface and changes the amount of light to the light sensing junction. Current through the Peltier junction is then switched causing the Peltier junction to heat the reflecting surface evaporating the moisture. The Peltier junction is then reversed to start another cycle.

REFERENCES:
patent: 3528278 (1970-09-01), Sterling
patent: 4035644 (1977-07-01), Ciemochowski
patent: 4082959 (1978-04-01), Nakashima
patent: 4212023 (1980-07-01), Chu
patent: 4216486 (1980-08-01), Geddes
patent: 4286464 (1981-09-01), Tauber

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