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Titolo:
SIMULTANEOUS MULTISPECTRAL IMAGING IN THE VISIBLE AND NEAR-INFRARED REGION - APPLICATIONS IN DOCUMENT AUTHENTICATION AND DETERMINATION OF CHEMICAL INHOMOGENEITY OF COPOLYMERS
Autore:
TRAN CD; CUI Y; SMIRNOV S;
Indirizzi:
MARQUETTE UNIV,DEPT CHEM,POB 1881 MILWAUKEE WI 53201
Titolo Testata:
Analytical chemistry (Washington)
fascicolo: 22, volume: 70, anno: 1998,
pagine: 4701 - 4708
SICI:
0003-2700(1998)70:22<4701:SMIITV>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACOUSTOOPTIC TUNABLE FILTER; MICROSCOPY; SPECTROSCOPY; FLUORESCENCE; SPECTROMETRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
C.D. Tran et al., "SIMULTANEOUS MULTISPECTRAL IMAGING IN THE VISIBLE AND NEAR-INFRARED REGION - APPLICATIONS IN DOCUMENT AUTHENTICATION AND DETERMINATION OF CHEMICAL INHOMOGENEITY OF COPOLYMERS", Analytical chemistry (Washington), 70(22), 1998, pp. 4701-4708

Abstract

A new multispectral imaging spectrometer capable of simultaneously recording spectral images in the visible and near-infrared has been developed. In this instrument, an acoustooptic tunable filter is used to diffract an unpolarized incident light into two diffracted beams with orthogonal polarization; one of them is detected by a silicon camera for the visible region while the other beam is detected in the near-infrared region (li om I to 1.7 mu m) with a NIR camera. The imaging spectrometer is sensitive, inexpensive, and field deployable because it is based on the recently available InGaAs focal plane arrays camera, which is low cost and can be sensitively operated at room temperature. Preliminary applications of the imaging spectrometer include measurementsof the visible and NIR absorption spectra of ink used to print U.S. currency. Such results may help to characterize samples as well as to control and to ensure the quality of the samples during the production processes; More important are the results obtained on ethylene/vinyl acetate copolymers. The NIR spectral images obtained clearly indicate that these copolymers exhibit a high degree of chemical inhomogeneity. Because of the possibility of inhomogeneity, it is very important thatthe homogeneity of polymers or copolymers be thoroughly understood before the NIR methods, especially those based on NIR spectrometers equipped with a single-element detector, are used for measurements.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 20:01:55