Low moisture cryogenic hygrometer

Details Low moisture cryogenic hygrometer Low moisture cryogenic hygrometer

1992-06-30

1994-04-05

Cuchlinski, Jr., William A.

Thermal measuring and testing

Transformation point determination

By change in optical property

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.

REFERENCES:
patent: 3623356 (1971-11-01), Bisberg
patent: 3812596 (1974-05-01), Willmanns
patent: 4216669 (1980-08-01), Harding, Jr.
patent: 4629333 (1986-12-01), Dosoretz et al.
patent: 4826327 (1989-05-01), Michell
patent: 4946288 (1990-08-01), Siska et al.
patent: 5022045 (1991-06-01), Elliott
patent: 5052818 (1991-10-01), Nishizawa et al.
patent: 5090817 (1992-02-01), Ker et al.

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