Advances in hardware have miniaturized the emissions spectrometer and associated optics, rendering them easily
deployed in the field. Such systems are also suitable for vehicle mounting, and can provide high quality data and
concentration information in minutes. Advances in software have accompanied this hardware evolution, enabling the
development of portable point-and-click OP-FTIR systems that weigh less than 16 lbs. These systems are ideal for first-responders,
military, law enforcement, forensics, and screening applications using optical remote sensing (ORS)
methodologies. With canned methods and interchangeable detectors, the new generation of OP-FTIR technology is
coupled to the latest forward reference-type model software to provide point-and-click technology. These software
models have been established for some time. However, refined user-friendly models that use active, passive, and solar
occultation methodologies now allow the user to quickly field-screen and quantify plumes, fence-lines, and combustion
incident scenarios in high-temporal-resolution. Synthetic background generation is now redundant as the models use
highly accurate instrument line shape (ILS) convolutions and several other parameters, in conjunction with radiative
transfer model databases to model a single calibration spectrum to collected sample spectra. Data retrievals are
performed directly on single beam spectra using non-linear classical least squares (NLCLS). Typically, the Hitran line
database is used to generate the initial calibration spectrum contained within the software.
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