Method and apparatus for measuring the dew point and/or frost po

Details Method and apparatus for measuring the dew point and/or frost po Method and apparatus for measuring the dew point and/or frost po

1994-08-05

1996-01-09

Gutierrez, Diego F. F.

Thermal measuring and testing

Transformation point determination

By change in optical property

374 17, 374 28, 73 2901, G01N 2568, G01N 2147, G01N 2155

Patent

active

054823714

ABSTRACT:
A method of determining the dew point of a gas containing a very small amount of water using (1) a reflector mirror the temperature of which can be varied from room temperature down to at least -80.degree. C.; (2) a source of condensed rays of light for irradiating the reflector mirror; and (3) a light recovering device that detects changes in scattered light due to condensation on the reflector mirror by exposing the mirror to the gas. The method comprises cooling the mirror and detecting the temperature at which the scattered light has a maximum intensity; slowly raising the temperature and detecting the temperature at which the scattered light has a minimum intensity and repeating the cycle until the temperature at which the intensity is a maximum and the temperature at which the intensity is a minimum are almost the same.

REFERENCES:
patent: 3623356 (1971-11-01), Bisberg
patent: 4155245 (1979-05-01), Coe
patent: 4216669 (1980-08-01), Harding, Jr.
patent: 4629333 (1990-12-01), Dosoretz et al.
patent: 4877329 (1989-10-01), Sauerbaum et al.
patent: 4908835 (1990-03-01), Nishiuchi et al.
patent: 4972677 (1990-11-01), Moriya et al.
patent: 5052818 (1991-10-01), Nishizawa et al.

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