Chilled mirror hygrometer with performance monitoring

Details Chilled mirror hygrometer with performance monitoring Chilled mirror hygrometer with performance monitoring

1984-10-19

1986-12-16

Frankfort, Charles

Thermal measuring and testing

Transformation point determination

By change in optical property

374 45, G01N 2502

Patent

active

046293337

ABSTRACT:
A radiation source directs light at a mirror which reflects to a first photosensor. As a dew point is reached, scattered light is reflected to a second photosensor to indicate dew point. Rather than periodically interrupting operation to test reflectivity of the mirror or to perform a heating cycle, operation is monitored continuously. The common mode output of both the first and second photosensors is monitored. When below a threshold level, the output indicates the need for cleaning the mirror. It may also be used in a closed loop to increase light source intensity as mirror reflectivity decreases.

REFERENCES:
patent: 3112648 (1963-12-01), Dulk
patent: 3623356 (1971-11-01), Bisberg

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