Thermal measuring and testing – Transformation point determination – By change in optical property
Patent
1989-05-18
1991-10-01
Cuchlinski, Jr., William A.
Thermal measuring and testing
Transformation point determination
By change in optical property
733365, 374 20, G01N 2568, G01N 2147
Patent
active
050528181
ABSTRACT:
An improved method of and an apparatus for measuring a very low water content in a non-condensible gas which has a dew point in the range of from ordinary temperature to -80.degree. C. or less. The gas to be measured is pre-cooled to a temperature slightly higher than that of the dew point, and is then blown against a reflecting mirror whose surface is cooled down to the dew point temperature of the gas. A condensed light having high luminance is projected toward the reflecting mirror. When the gas is blown against the mirror and cooled down to the temperature of the dew point, thereof a dew or frost is formed on the mirror, and the amount of scattered light reflected from the mirror is increased by the dew or frost. This increase in scattered light is detected by a photodetector. A silicon wafer which is polished to have a surface precision of 1/4 or less that of the wavelength of the condensed light is employed as the mirror to enable measurement of dew points of -80.degree. C. or less.
REFERENCES:
patent: 3269185 (1963-01-01), Francisco
patent: 3281814 (1966-10-01), Munchen
patent: 3943774 (1976-03-01), Pollanz
patent: 4083224 (1978-04-01), Gayst
patent: 4083249 (1978-04-01), Gerber
patent: 4216669 (1980-08-01), Harding, Jr.
patent: 4276768 (1981-07-01), Dadachanji
patent: 4376583 (1983-03-01), Alford et al.
patent: 4629333 (1986-12-01), Dosoretz et al.
patent: 4753504 (1988-06-01), Kyogoku
patent: 4799235 (1989-01-01), Bannell et al.
Control and Instrumentation, (1983) vol. 15 No. 2.
Advances in Instrumentation 8131, vol. 37, (1982) Part 3, Research Triangle Park, NC. U.S.A.
Kijima Takahiko
Nishizawa Jun-ichi
Tagawa Taichi
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Junichi Nishizawa
Osaka Sanso Kogyo Ltd.
LandOfFree
Method of and apparatus for measuring very low water content in does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and apparatus for measuring very low water content in , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for measuring very low water content in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1750726