Gaea Technologies propose to develop a novel, in situ cross stack monitor for improved detection of criterion gases. The system is based on the use of recently developed ultra-narrow bandwidth solid-state filters for improved spectral resolution, and reduction of spectral interferences and errors due to variable aerosol extinction. These unique filters can be fabricated with bandwidths as narrow as 4 GHz, and can be designed for multi-wavelength operation. They provide the equivalent spectal resolution at selected wavelengths of a state-of-the-art FTIR system, in a crystal only a few millimeters on a side. Currently the accessible operating region is limited to wavelengths shorter then 5.0 microns. The system will also incorporate newly developed noise canceling receivers for enhanced sensitivity. The technique is suitable for use in extractive monitoring systems, and with multi-pass sampling.Specifically, in Phase I they will fabricate and characterize a prototype system for detection of CO using overtone transitions near 1550 nm. They will compare and contract their results with alternative methods of continuous emissions monitoring, with particular emphasis on detection sensitivity, signal-to-noise ratios, sources of error, and sensitivity to spectral interferences. In Phase II, they will extend the work to detection of multiple species in the mid-IR.
