Atmospheric condition detecting and indicating apparatus and met

Details Atmospheric condition detecting and indicating apparatus and met Atmospheric condition detecting and indicating apparatus and met

1975-07-01

1977-07-12

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

73 17A, 250338, 250353, G01J 100

Patent

active

040356442

ABSTRACT:
A photo-optic hygrometer comprising a thermocooler with a light reflecting surface has an infrared light beam directed against such surface by an infrared light emitting diode as to reflect such light beam against a phototransistor and place such phototransistor in conduction while, at the same time the reflecting surface is cooled by the thermocooler so as to thereby eventually cause dew formation on such surface; upon such dew formation the infrared energy is substantially absorbed by the dew thereby preventing the phototransistor from being conductive which, in turn, causes the reflecting surface to become somewhat heated thereby evaporating the dew and causing the above cycle to repeat. The monitored temperature of such reflecting surface at generally the cycle repeating temperature constitutes the dew point temperature which, along with other measured temperatures, such as ambient and/or structural surface temperatures are employed as inputs which through associated logic circuitry determine the energization and/or de-energization of related output means responsive to selected determined atmospheric conditions. The apparatus and method is employable in any desired atmosphere whether such be ambient or a closed atmosphere of a selected gas or mixture thereof.

REFERENCES:
patent: 3077763 (1963-02-01), Gena et al.
patent: 3623356 (1971-11-01), Bisberg

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