Frequency Resolution of Acousto-Optical Spectrometer,
NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
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This paper discusses the frequency resolution of an acoustic-optical spectrometer system under influences of deflectors spectral resolution, coherent light-beam truncation ratio, and photodiode arrays response. The broadening of the resoluble line-pattern caused by the response of a photodiode pixel has been computed. According to this discussion the authors proposed the selecting principles for design parameters of the acousto-optical spectrometer including light-beam truncation ratio, focal length of Fourier transform lens, and number of photodiode array elements, i.e. the quantitative criteria for specific observational necessities with an acousto-optical spectrometer considered with resolution, bandwidth, and sidelobes of instrumental profile comprehensively. An experimental measurement of the frequency resolution to verify above theoretical computations has also been carried out.
- Acoustooptic and Optoacoustic Devices