Comparative analysis of information capacity for space surveillance systems in 3-5 and 8-14 urn spectral ranges

摘要

The information capacities of infrared optoelectronic systems are not identical in the middlewave (3-5µm) and longwave (8-14µm) ranges of spectrum. The analysis of the so-called quality factor ', rendering the preference to range 8-14µm at underlaying surface temperature below 40, does not take into consideration the system spatial resolution, which depends upon a fundamental factor - the wavelength, and therefore can not serve as a decisive argument in choosing a photodetector and a spectral range for an IR surveillance system. The paper is concerned with informational characteristics of a specific system depending upon a spectral range. It is shown that, despite more low resolution of optical system;the spectral range 8-14µm nevertheless, in a basic interval of informational frequencies (nearly up to Nyquist frequency) has the advantage in comparison with the range 3-5µm as on temperature, as on spatial resolution