Frost and dew sensor

Details Frost and dew sensor Frost and dew sensor

1990-07-18

1991-03-19

Cuchlinski, Jr., William A.

Thermal measuring and testing

Transformation point determination

Between gaseous and liquid states

374 16, 374 10, G01N 2566

Patent

active

050005790

ABSTRACT:
In a frost and dew sensor composed of two thermosensitive resistors, a power source and an arithmetic circuit, frost or dew is detected from the change of a differential temperature between the two thermosensitive resistors as two different currents from the power source are supplied to the respective thermosensitive resistors. In an alternative form, the sensor has a single thermosensitive resistor, which is energized as two different currents are alternately supplied from the power source so that frost or dew is detected by comparison of the time-lags between the two outputs from the thermosensitive resistor.

REFERENCES:
patent: 2904995 (1959-09-01), Obermaier
patent: 3514993 (1970-06-01), Simpson
patent: 4579462 (1986-04-01), Rall et al.
patent: 4586828 (1986-05-01), Winter et al.
Du Pont 900 Differential Thermal Analyzer, Instrument Products Division, Wilmington, DE (Jun. 1963).

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