Abstract
A two-dimensional imaging spectrograph, developed for non- intrusive temperature measurements in flames, has been characterized using a pressure-controlled sodium heat pipe blackbody (Na-HPBB). The spectrograph contains a two- dimensional PtSi CCD array and provides spatial information in one dimension and spectral information in the other dimension. The usable range of the spectrograph, which images a line approximately 35 mm in length, covers the region from 2.5 micrometers to 5.0 micrometers . Using the stable and uniform Na-HPBB, the spectrograph was calibrated for absolute spectral radiance by employing Planck's Law. These measurements show that the spectrograph uniformity is within 0.25% (k equals 2), and provide calibration constants that can be applied to future measurements. The results presented here will enable the spectrograph to be used to measure the emission characteristics of high temperature surfaces, gases, and particles, and as a transfer detector to calibrate other secondary sources.
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