Thermal measuring and testing – Transformation point determination – Between gaseous and liquid states
Patent
1989-10-12
1991-01-01
Cuchlinski, Jr., William A.
Thermal measuring and testing
Transformation point determination
Between gaseous and liquid states
374 16, 374 10, G01N 2566
Patent
active
049813692
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, Del. (Jun. 1963).
Kumada Akira
Murata Michihiro
Takata Eiichi
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Murata Mfg. Co. Ltd.
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