KEYWORDS: Sensors, Solar thermal energy, Reticles, Signal detection, Light sources, Imaging systems, Modulation transfer functions, Signal processing, Staring arrays, Signal to noise ratio
This paper illustrates the pros and cons of a methodology that used test bars for throughput signal
equalization. We also introduce a special test equipment (STE) plate scale for spatial
measurement, which is recommended not only for its performance, but also for simplicity of
implementation.
The line spread function (LSF) is a classical figure of merit used to derive the modulation
transfer function (MTF) of an imaging sensor. The test requires that a uniform light source be
used to project test bars into the sensor via an integrating sphere to construct LSF curve.
However, source uniformity through the test bars is not easily achieved. Test results will be
adversely affected in cases where either the integrating sphere provides less than 100 percent
uniformity in temporal brightness for the various wavelength applications, or where the test bars
have been physically warped (on a scale of microns) due to supplier producibility variation.
To effectively utilize the existing STE, Raytheon applied a test-bar throughput signal
equalization method to correct for the light source and/or test bar dimensional non-uniformity
errors during the spatial performance evaluation. The successful approach compensated for the
STE limitations without incurring expenditures for new custom-made equipment.
KEYWORDS: Temperature metrology, Ozone, Combustion, Luminescence, Data modeling, Excimer lasers, Information operations, Systems modeling, Iris recognition, Photolysis
The adverse impact of chlorofluorocarbons (CFCs) on stratospheric ozone has prompted an international effort for replacement with environmentally acceptable alternatives such as hydrogen-containing chlorofluorocarbons (HCFCs). Previous studies of the reactions of OH and HCFC were limited to 298 K or below. Rate coefficients are needed above 480 K to verify the existing theoretical interpretations. Kinetics study of OH and HCFC reactions over an extended temperature range is revealed by LP/LIF technique. Based on the experimental data, the conventional transition state theory with the assistance of ab initio calculations is used to predict the reactions above 2000 K. A methodology is evolved from the precision measurements and the reliable theoretical studies.
Strain parameters of thin films are needed to numerically simulate the optical gain of light amplification for semiconductor devices. We report a complete quantitative treatment of the stress-strain relations for several common (h,h,k) orientations. We find that earlier reports that attributed the presence of tensile elastic strain to both thermal and lattice-mismatches gave strain estimates that were too low. Using our calculations, we present a model to explain the observed shifts in excitonic recombination energies that have been reported by many groups to date.
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