Thermal measuring and testing – Transformation point determination – By change in optical property
Patent
1991-10-28
1993-01-12
Cuchlinski, Jr., William A.
Thermal measuring and testing
Transformation point determination
By change in optical property
374 19, 374 20, G01N 2566, G01N 2570
Patent
active
051784629
ABSTRACT:
A method and an apparatus for measuring dewpoint of different kinds of gases, is based on cooling the measured gas, with the help of cold gas, down to the dewpoint and then detecting the generated mist by optical sensors. The cooling gas is routed to a measurement area (7) from outside the process and the cooling gas is brought to an appropriate temperature below the dewpoint of the measured gas before being conducted to the measurement area (7). Mist generated during the cooling of the measured gas is detected by illuminating the measurement area (7) by a light emitting source (8) and measuring the light (2) scattered from the mist or light (3) penetrating through the mist with the help of a photodetector (9). The temperature of the measurement area is continuously monitored with temperature sensors (10) so that when the mist is detected, the temperature of the measurement area (7) at that instant corresponds to the dewpoint temperature of the measured gas.
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Cuchlinski Jr. William A.
Gutierrez Diego F. F.
Vaisala Oy
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