G - Physics – 01 – N
Patent
G - Physics
01
N
73/53
G01N 25/56 (2006.01) G01N 21/81 (2006.01)
Patent
CA 1282250
ABSTRACT The present invention is directed to novel chemical compositions suitable for use in "salt- solution transition temperature" or "hot mirror" devices. It also provides methods of using these sensors (which are especially suitable for the pre- cise measurement of the humidity of gases) as well as the apparatus. The devices and methods of the present inven- tion provide many variations of light sources to be used such as LEDs, tungsten lamps, neon lamps, etc. and with a variety of light detecting means such as photo- transistors, photo-SCRs, photodiodes, photo-resistor cells, etc. The chemical composition which of itself senses the changes of water vapor pressure is bire- fringent, translucent, and anisotropic at a first water vapor pressure and temperature, but non- birefringent, optically clear, and isotropic at a second vapor pressure and temperature. The optical changes which accompany these phase changes may be amplified by passing the light beam through a polarizer and passing the polarized beam through the composition and then through an analyzer to a detector. The means for heating the chemical composi- tion can vary from simple heating elements of resistance to wire to thermistors used in the self-heating mode. Thermometers, thermistors, platinum resistance thermometers, and other devices can be used for tem- perature sensing. The accuracy required of the particular instrument model, the device's configuration, and the other components selected for the particular system all affect the choice of thermometric device selected. The light detector may be the eye or a suit- able photo-device. The detectors are responsive to observable changes in the brightness and intensity of the light emerging from the chemical composition, the light from the composition at a particular water vapor pressure and temperature being of sufficient brightness and intensity to provide an optical signal to activate the light-detecting electrical means.
515398
Elliott Stanley B.
Macrae & Co.
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