Digital sensing device

Details Digital sensing device Digital sensing device

1976-01-02

1977-07-12

Queisser, Richard C.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 73, G01W 102

Patent

active

040346099

ABSTRACT:
A multiple laminae humidity sensing device for visually indicating changes in relative humidity including a moisture impermeable transparent support layer having a viewing side and a sensing side opposite said viewing side; an indicator layer with a plurality of filter cells, each including a transparent carrier material and an inorganic salt composition dispersed in the transparent carrier material that provides a known visible color response to changes in relative humidity on the sensing side of the support layer and a moisture permeable reflective layer behind the indicator layer so that light passing through the support layer and the indicator layer is reflected back through the indicator layer and the support layer through the viewing side of the support layer so as to be readily visible from the viewing side of the support layer.

REFERENCES:
patent: 3002385 (1961-10-01), Wahl et al.
patent: 3175401 (1965-03-01), Geldmacher
patent: 3440882 (1969-04-01), Jones
patent: 3548639 (1970-12-01), Krause
patent: 3576761 (1971-04-01), Davis
patent: 3631720 (1972-01-01), Weinstein et al.
patent: 3859856 (1975-01-01), Keele et al.
patent: 3864976 (1975-02-01), Parker
patent: 3878722 (1975-04-01), Crites

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