©2003 Marcel Dekker, Inc. All rights reserved. This material may not be used or reproduced in any form without the express written permission of Marcel Dekker, Inc. MARCEL DEKKER, INC. • 270 MADISON AVENUE • NEW YORK, NY 10016 APPLIED SPECTROSCOPY REVIEWS Vol. 38, No. 2, pp. 133–153, 2003 Infrared Multispectral Imaging: Principles and Instrumentation Chieu D. Tran * Department of Chemistry, Marquette University, Milwaukee, Wisconsin, USA CONTENTS ABSTRACT ......................................... 134 I. INTRODUCTION .................................... 134 II. SPECTRAL TUNING DEVICES ......................... 136 1. Acousto-optic Tunable Filters .......................... 136 2. Liquid Crystal Tunable Filters .......................... 143 III. INFRARED FOCAL PLANE ARRAYS .................... 144 1. InGaAs Focal Plane Arrays ............................ 145 2. InSb Focal Plane Arrays .............................. 146 3. Mercury Cadmium Telluride (HgCdTe) Focal Plane Arrays ..... 146 4. Quantum Well Infrared Photodetectors (QWIP) .............. 147 *Correspondence. Chieu D. Tran, Department of Chemistry, Marquette University, P.O. Box 1881, Milwaukee, Wisconsin 53201-1881, USA; E-mail: chieu.tran@marquette.edu. 133 DOI: 10.1081/ASR-120021165 0570-4928 (Print); 1520-569X (Online) Copyright & 2003 by Marcel Dekker, Inc. www.dekker.com