Uv and ir hygrometers

From Glossary of Meteorology
Revision as of 17:11, 25 April 2012 by imported>Perlwikibot
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)



UV and IR hygrometers

Instruments using absorption of electromagnetic radiation to sense humidity.

Ultraviolet (UV) hygrometers use a single wavelength absorbed by molecular water vapor, such as the Lyman-alpha line produced by a hydrogen discharge tube. Infrared (IR) hygrometers can also operate on a single absorption line if the source is an infrared-emitting tunable diode laser (TDL), though broad-band instruments, which integrate the absorption across many individual lines, are also used. These instruments utilize Beer's law to estimate the density of absorption across the path between the source and a detector (e.g., an ionization tube for ultraviolet, or a photodiode for infrared), which contains the air sample. In many cases, these hygrometers have sufficient speed of response that they can resolve rapid turbulent fluctuations of humidity.


Retrieved from "https://glossarystaging.ametsoc.net/w/index.php?title=Uv_and_ir_hygrometers&oldid=3714"
Powered by MediaWiki
Powered by WikiTeq
Powered by Semantic MediaWiki
Copyright 2024 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.