Measurement of attenuation and change of refractive index due to water vapour in the atmosphere at 890 GHz
- 14 November 1974
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 10 (23) , 470-471
- https://doi.org/10.1049/el:19740374
Abstract
An open-resonator technique is used to measure the attenuation and change of refractive index at 890 GHz for a variable water-vapour content in the atmosphere, using an HCN laser as a source. The refractive index increases uniformly with water-vapour content, a change of relative humidity from 0 to 50% at 26°C resulting in an index change of 1.3 × 10−4. An attenuation of 85±20 dB/km was measured for 50% relative humidity at 26°C.Keywords
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