A new gas filter correlation spectrometer (GASPEC), for the remote detection of trace vapors in the atmosphere by means of natural emission in the ir, is described. Unique optical features of the GASPEC include two detectors using a single focal plane chopper plus an optical reference for electronic gain balancing. Continuous sensor balance and calibration are achieved along with the source radiometric and target gas information. Several GASPEC instruments have been built and tested including devices to sense CH 4 , C 2 H 6 , HC1, and CO. Some preliminary data taken with these sensors are presented.
A five-component optical model of Lake Ontario is discussed in terms of unique organics (as represented by chlorophyll a), unique inorganics (as represented by total suspended minerals), unique nonliving organics, and unique dissolved organics. Direct measurements of the irradiance attenuation coefficient K(0), the diffuse reflectance R(0), and the total atttenuation coefficient c are used in conjunction with simulated solutions of the radiative transfer equations to determine the inherent optical properties of the water masses. Multiple regressions between these inherent optical properties and directly measured water quality data are then performed to determine the absorption, scattering, and backscattering cross sections of the organic and inorganic components.
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