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Titolo:
Optical UV derivative spectroscopy for monitoring gaseous emissions
Autore:
Vogt, F; Klocke, U; Rebstock, K; Schmidtke, G; Wander, V; Tacke, M;
Indirizzi:
Fraunhofer Inst Phys Measurement Technique, D-79110 Freiburg, Germany Fraunhofer Inst Phys Measurement Technique Freiburg Germany D-79110 many Siemens AG, D-76135 Karlsruhe, Germany Siemens AG Karlsruhe Germany D-76135 mens AG, D-76135 Karlsruhe, Germany
Titolo Testata:
APPLIED SPECTROSCOPY
fascicolo: 11, volume: 53, anno: 1999,
pagine: 1352 - 1360
SICI:
0003-7028(199911)53:11<1352:OUDSFM>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
UV/VISIBLE ABSORPTION-SPECTRA; DOAS; SPECTROMETER; AMMONIA; NO2; SO2; NH3;
Keywords:
optical UV derivative spectroscopy; on-line monitoring; gaseous emissions; chemometric methods;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Vogt, F Fraunhofer Inst Phys Measurement Technique, Heidenhofstr 8, D-79110 Freiburg, Germany Fraunhofer Inst Phys Measurement Technique Heidenhofstr8 Freiburg Germany D-79110
Citazione:
F. Vogt et al., "Optical UV derivative spectroscopy for monitoring gaseous emissions", APPL SPECTR, 53(11), 1999, pp. 1352-1360

Abstract

UV derivative spectroscopy is investigated for its potential in online control of various processes. One typical application is emission monitoring of several pollutants such as SO2, NO, NO2, NH3, and aromatic hydrocarbons. The proposed method gains selectivity and sensitivity by using the first and second derivative of the transmission spectrum with respect to wavelength. These derivatives are generated in an optical manner and are compared empirically for the first time with the known numerical derivative spectroscopy and conventional transmission spectroscopy. The generation of the opticalderivatives is discussed. For demonstration of the feasibility, laboratorymonitoring results are reported. With the use of a sample pathlength of 10cm with this optical method, detection limits are determined to be 4 ppm, compared to 11 ppm with numerically calculated signals and 20 ppm obtained by using the transmission only. Typically a time resolution of below three minutes is achieved. Emphasis is also laid on the treatment of an observed nonlinearity by means of chemometric calibration and evaluation algorithms such as principal component regression (PCR) and partial least-squares (PLS).

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Documento generato il 01/12/20 alle ore 10:49:08