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pubmed-article:7717527pubmed:dateCreated1995-5-17lld:pubmed
pubmed-article:7717527pubmed:abstractTextNear-IR spectroscopy is especially well suited to moisture determination because of the relatively high absorptivity of water compared to most other substances. In the present work, near-IR diffuse-transmittance spectroscopy is applied to the measurement of humidity via observation of adsorbed water on a high-performance thin-layer chromatography silica gel plate. The adsorbed water is detected through both ordinary absorption of radiation by water molecules and the increased scattering of near-IR radiation by the silica gel as it adsorbs more water. This technique shows promise as a highly accurate and sensitive humidity sensor with a time constant of less than 1 min. The addition of inorganic salts to the silica gel layer is shown to increase the response to water vapor. However, it also increases the time constant of the sensor. A miniature humidity sensor using a commercially available near-IR transmissive switch is also demonstrated. Possible interferences and hysteresis effects are investigated.lld:pubmed
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pubmed-article:7717527pubmed:authorpubmed-author:FonsMMlld:pubmed
pubmed-article:7717527pubmed:authorpubmed-author:HieftjeG MGMlld:pubmed
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pubmed-article:7717527pubmed:pagination1139-46lld:pubmed
pubmed-article:7717527pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:7717527pubmed:year1995lld:pubmed
pubmed-article:7717527pubmed:articleTitleNear-infrared measurement of relative and absolute humidity through detection of water adsorbed on a silica gel layer.lld:pubmed
pubmed-article:7717527pubmed:affiliationDepartment of Chemistry, Indiana University, Bloomington 47405.lld:pubmed
pubmed-article:7717527pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7717527pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:7717527pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:7717527pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed