Low moisture cryogenic hygrometer

Thermal measuring and testing – Transformation point determination – By change in optical property

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374 18, G01N 2502

Patent

active

052998673

ABSTRACT:
A dew or frost point hygrometer wherein a reflective surface, which is cooled by a cryogenic source and held at the dew or frost point-temperature by a servo control, reflects light from a light source to a light detector. Very low concentrations of moisture or frost which condense on the reflective surface are measured very rapidly as a change in light reflected from that surface. No re-calibration is needed throughout its exceedingly wide moisture measurement range of from about 1 ppb to about 30 ppm within a temperature range of from about -110.degree. C. to about 30.degree. C.

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patent: 5022045 (1991-06-01), Elliott
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patent: 5090817 (1992-02-01), Ker et al.

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