Thermal measuring and testing – Transformation point determination – By change in optical property
Patent
1990-07-05
1991-06-04
Will, Thomas B.
Thermal measuring and testing
Transformation point determination
By change in optical property
374 17, 374 18, 733365, G01N 2512
Patent
active
050220454
ABSTRACT:
The invention is directed to chemical compositions suitable for use in salt-solution transition temperature or hot mirror devices. It also provides methods of using these sensors (for the measurement of the humidity of gases) as well as the apparatus. The chemical composition which of itself senses the changes of water vapor pressure is birefringent at a first water vapor pressure and temperature, but non-birefringent at a second vapor pressure and temperature. The optical changes which accompany these phase changes may be amplified with polarizers. The means for heating the chemical composition can vary widely. Various thermometric devices can be used for temperature 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 is 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.
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