The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1993
Filed:
Oct. 28, 1991
Ari Lehto, Helsinki, FI;
Vaisala OY, Helsinki, FI;
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.