Thermal measuring and testing – Transformation point determination – By change in optical property
Patent
1988-01-19
1989-05-02
Levy, Stewart J.
Thermal measuring and testing
Transformation point determination
By change in optical property
733365, G01N 2502
Patent
active
048263273
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.
REFERENCES:
patent: 3112648 (1963-12-01), Dulk et al.
patent: 3319457 (1967-05-01), Leone
patent: 4629333 (1986-12-01), Dosoretz et al.
Levy Stewart J.
Michell Instruments Ltd
Roskos Joseph W.
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