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Titolo:
Time-resolved multispectral imaging spectrometer
Autore:
Khait, O; Smirnov, S; Tran, CD;
Indirizzi:
Marquette Univ, Dept Chem, Milwaukee, WI 53201 USA Marquette Univ Milwaukee WI USA 53201 Dept Chem, Milwaukee, WI 53201 USA
Titolo Testata:
APPLIED SPECTROSCOPY
fascicolo: 12, volume: 54, anno: 2000,
pagine: 1734 - 1742
SICI:
0003-7028(200012)54:12<1734:TMIS>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
TUNABLE FILTERS; MICROSCOPY; INHOMOGENEITY; FLUORESCENCE; SYSTEMS; REGION;
Keywords:
acousto-optic tunable filter; multispectral imaging; liquid crystal;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Tran, CD Marquette Univ, Dept Chem, POB 1881, Milwaukee, WI 53201 USA Marquette Univ POB 1881 Milwaukee WI USA 53201 ukee, WI 53201 USA
Citazione:
O. Khait et al., "Time-resolved multispectral imaging spectrometer", APPL SPECTR, 54(12), 2000, pp. 1734-1742

Abstract

A new multispectral imaging spectrometer with millisecond resolution has been developed. This instrument is based on the use of an acousto-optic tunable filter (AOTF) for spectral tuning and a simple progressive scan camera capable of snapshot operation for recording. The fast multispectral imagingcan be performed in two configurations: recording images as a function of time or as a function of wavelength. In the first configuration, multiple images are recorded, grabbed, and stored per one wavelength. Upon completion, the AOTF is scanned to a new recording wavelength and a new set of imagesare recorded. It was found that, in this configuration, the imaging spectrometer is capable of recording, grabbing, and storing up to 33 images per s(i.e., 30 ms per image). Because an external signal is used to start the event and the recording of images, and the period between the start of the event and the recording and grabbing of images can be appropriately adjustedby a delay line, the time resolution of the spectrometer is not limited to30 ms but rather can be adjusted to a shorter or longer time scale. In thesecond configuration, the recording wavelength is rapidly scanned (by the AOTF) and only one image is rapidly recorded, grabbed, and stored for each wavelength. Because additional time is needed to scan the AOTF, the maximumnumber of images that can be grabbed in this case is 16 frames per s. Preliminary applications of the imaging spectrometer include measurements of photo-induced changes in temperature-sensitive cholesteric liquid crystals asa function of time and wavelength. It was found that irradiating with a near-infrared (NIR) diode laser of 805 nm led to changes in the liquid crystal. The changes were found to vary with time and wavelength, namely, at about 360 ms after the NIR laser pulse the liquid crystal underwent changes in the visible region around 570 nm. The changes shifted toward longer wavelength concomitantly with time; i.e., maximum change at about 600 ms shifted to 718 nm.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 12:06:18