Patent ID: 7630835
Filing Date: 2009-12-08
Classification: G01K,G01S,Y02A

Abstract:
1. A process to calculate a relative humidity, an absolute humidity, or a water vapor concentration, the process comprising: receiving at a detector a first frequency of electromagnetic radiation, the first frequency of electromagnetic radiation transmitted through a medium within a frequency range of approximately 0.1 TeraHertz to approximately 10 TeraHertz; receiving at the detector a second frequency of electromagnetic radiation, the second frequency of electromagnetic radiation transmitted through the medium within a frequency range of approximately 0.1 TeraHertz to approximately 10 TeraHertz; generating a first signal at the detector, the first signal proportional to a transmittance of the first frequency of electromagnetic radiation through the medium; generating a second signal at the detector, the second signal proportional to a transmittance of the second frequency of electromagnetic radiation through the medium; forming a ratio of the first signal and the second signal; determining one or more sets of parameters by: using the best fit function or a lookup table at a particular temperature to determine one or more of the relative humidity, the absolute humidity, and the water vapor concentration at the particular temperature.