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Titolo:
NEAR-INFRARED MEASUREMENT OF RELATIVE AND ABSOLUTE-HUMIDITY THROUGH DETECTION OF WATER ADSORBED ON A SILICA-GEL LAYER
Autore:
FONG A; HIEFTJE GM;
Indirizzi:
INDIANA UNIV,DEPT CHEM BLOOMINGTON IN 47405 INDIANA UNIV,DEPT CHEM BLOOMINGTON IN 47405
Titolo Testata:
Analytical chemistry
fascicolo: 6, volume: 67, anno: 1995,
pagine: 1139 - 1146
SICI:
0003-2700(1995)67:6<1139:NMORAA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPOSITE THIN-FILMS; FIBER-OPTIC SENSOR; SENSING CHARACTERISTICS; SPECTROSCOPY; DYE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
A. Fong e G.M. Hieftje, "NEAR-INFRARED MEASUREMENT OF RELATIVE AND ABSOLUTE-HUMIDITY THROUGH DETECTION OF WATER ADSORBED ON A SILICA-GEL LAYER", Analytical chemistry, 67(6), 1995, pp. 1139-1146

Abstract

Near-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 ordinaryabsorption 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 humiditysensor 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 andhysteresis effects are investigated.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 22:24:04