Frequency Resolution of an Acousto-Optical Spectrometer
Abstract
The paper discusses the frequency resolution of an acousto-optical spectrometer (AOS) system as affected by the acousto-optical deflector and the coherent light beam truncation ratio, and examines the response of the photodiode array reception system as affected by the AOS frequency resolution. The broadening of the resolution line pattern caused by the response of a photodiode pixel was computed. From this discussion, the authors proposed selection principles for AOS design parameters, including the light beam truncation ratio, focal length of the Fourier lens, and the number of photodiode array elements. These principles include the overall consideration of resolution, frequency bandwidth, and side lobes of the instrument profile in order to enable the AOS to be designed on a quantitative basis that is suitable to specific observational requirements. To verify these theoretical calculations, the frequency resolution was experimentally measured.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 03, 1993
- Accession Number
- ADA267822
Entities
People
- Jianjun Shen
- Jingsheng Wang
Organizations
- National Air and Space Intelligence Center