Detection of moisture in refrigerants

Details Detection of moisture in refrigerants Detection of moisture in refrigerants

2007-10-17

2010-06-01

Nguyen, Sang (Department: 2886)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

C356S436000, C250S343000

Reexamination Certificate

active

07728978

ABSTRACT:
Moisture can be detected in a refrigerant background such as HFC (Hydrofluorocarbon) HFC-134A and HFC-152A and exampled by HFC-23, HFC-32, HFC-143A, HFC-125, HFC-245FA, HFC-227EA, and the like. The system can include a light source operating at any one of several wavelengths within the water absorption bands at wavelengths such as 1.4, 1.9 and 2.7 μm and a detector that measures the transmitted light intensity through the HFC samples. In one variation, the light source is a tunable diode laser and the moisture level is determined by direct absorption and harmonic spectroscopy. Related techniques, apparatus, systems, and articles are also described.

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