Terahertz sensor to measure humidity and water vapor

Details Terahertz sensor to measure humidity and water vapor Terahertz sensor to measure humidity and water vapor

2007-10-31

2009-12-08

Wachsman, Hal D (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C702S023000, C702S024000, C702S134000, C250S341100, C250S340000

Reexamination Certificate

active

07630835

ABSTRACT:
A first frequency of electromagnetic radiation and a second frequency of electromagnetic radiation are received at a detector. The first and second frequencies of electromagnetic radiation are transmitted through a medium within a frequency range of approximately 0.1 TeraHertz to approximately 10 TeraHertz. Signals are generated that are proportional to the transmittance of the frequencies of electromagnetic radiation through the medium. A ratio of the of the signals is formed, and one or more of a relative humidity, an absolute humidity, and a water vapor concentration of the medium are calculated as a function of a temperature of the medium, the ratio, and a set of functional parameters associated with the temperature of the medium.

REFERENCES:
patent: 6073480 (2000-06-01), Gokhfeld
patent: 2007/0146720 (2007-06-01), Cox et al.
patent: 2007/0278407 (2007-12-01), Wood et al.

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