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:
May. 02, 1989
Filed:
Jan. 19, 1988
Andrew K Michell, Cambridge, GB;
Michell Instruments Ltd, Cambridge, GB;
Abstract
A dewpoint meter has a sensor comprising a mirror (1) situated in a chamber (2) through which gas, the dewpoint of which is to be measured is passed through an inlet port (3) and an outlet port (4). The mirror (1) is cooled by a Peltier effect heat pump (11) and the formation of condensation on the mirror as it is cooled is detected by a detector comprising a light emitting diode (7) and a photodiode (8). The temperature at which condensation occurs, which is the dewpoint of the gas, is measured by a thermometer. Instead of transferring the heat from the heat pump (11) directly to a heat sink (13) as is usual, a heat pipe (12) is interposed between the heat pump (11) and the heat sink (13). This avoids the necessity for having the heat sink closely adjacent the mirror and thus avoids errors caused by heat from the heat sink affecting the temperature of the mirror.