Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1988-11-28
1991-02-05
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
2503385, 250339, G01N 2556, G01J 506, G01J 508, G01J 562
Patent
active
049907816
ABSTRACT:
In a spectroscopically operating infrared hygrometer, beams emitted by the beam source and formed by the lens arrangement disposed in front thereof, are reflected via two pairs of rotating lenses, fixed in two parallel planes which are at a fixed distance from each other, and via a fixed mirror, to the lens arrangement placed in front of the detector and are directed by this lens arrangement to the detector. In this infrared hygrometer the absorption distance change takes place very rapidly, so that it is possible during measurements over longer perids of time, for example, during measurements taken from an airplane, to relate with small time constants the individual measurement values for the two absorption distances continuously. Furthermore, intermediate calibration is not required with this infrared hygrometer.
REFERENCES:
patent: 3364351 (1968-01-01), Palmer
patent: 4083249 (1978-03-01), Gerber
patent: 4526034 (1985-07-01), Campbell
Hyson et al., "A Single-Beam Infrared Hygrometer for Evaporation Measurem", J. Appl. Met., 14, 1975, pp. 301-307.
Bogomolova et al., "Double-Beam Infrared Spectrometer for Measuring Humidity Fluctuations in the Atmosphere", Izv. Atm. and Oceanic Physics, vol. 10, 1974, pp. 933-942.
Buck, Arden L., "The Variable-Path Lyman-Alpha Hygrometer and Its Operating Characteristics", Bull. Amer. Met. Soc., vol. 57, No. 9, Sep. 1976, pp. 1113-1118.
Deutsche Forschungs- und Versuchsanstait fur Luft- und Raumfahrt
Glick Edward J.
Hannaher Constantine
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