IR multispectral remote imaging enables non-contact, quantitative chemical and physical analysis of the air and surfaces in situations where in situ measurements are either undesirable or impossible. Sensors function by acquiring a spectrum on each element of a 2-D detector array, i.e., an IR focal plane array, and the spectrum is typically compared against known spectra of possible targets. Specific applications of IR multispectral remote imaging include detection and identification of chemical vapor plumes, aerosol clouds, and liquid contamination on surfaces. For remote chemical sensing applications, sensors are typically most effective when designed to operate in the "chemical fingerprint" region, λ ~ 8 μm to 12 μm, where many chemical species exhibit strong and unique absorption and emission signatures.