Measuring and testing – Gas content of a liquid or a solid – By vibration
Patent
1979-11-16
1981-07-07
Woodiel, Donald O.
Measuring and testing
Gas content of a liquid or a solid
By vibration
G01N 2568
Patent
active
042767687
ABSTRACT:
There is disclosed apparatus for measuring the dew point which is arranged to carry out a method in which there is repeatedly performed a measuring cycle in which a body on which dew can form is cooled gradually until the formation of dew thereon is detected by detecting means, the temperature at which dew forms on said body being recorded in the apparatus and the temperature of said body being subsequently allowed to rise prior to cooling again in the next succeeding cycle. The temperature of said body is monitored continuously and the rate of cooling of the body in each cycle is controlled in dependence upon the difference between the instantaneous temperature of said body and the dew point temperature measured in a preceding cycle and recorded in the apparatus, in such a way that the rate of cooling is lower for at least a range of temperatures closer to said dew point temperature recorded in said previous cycle than for instantaneous temperatures of said body further from said dew point temperature recorded in said previous cycle. Thus, it is possible to combine the advantages of a rapid cooling rate, affording a high sampling frequency, and of a slow cooling rate, affording good accuracy.
REFERENCES:
patent: 3195344 (1965-07-01), Francisco
patent: 3204418 (1965-09-01), Mathews
patent: 3664177 (1972-05-01), Bridgeman et al.
patent: 3926052 (1975-12-01), Bechtel
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