摘要
本文讨论了声光频谱仪(AOS)中声光偏转器的频率分辨率和相干光束截断比,以及光电二极管阵接收系统响应对AOS频率分辨率的影响。计算了光电二极管阵象元响应对分辨率线型的展宽,通过这些讨论得出了AOS设计参数(光束截断比,傅里叶透镜焦距,阵象元数)的选择原则,即综合考虑分辨率、频带宽度和仪器轮廓旁瓣,以使AOS适合特定观测要求的定量依据,通过实验测定验证了上述的理论计算。
This paper discusses the frequency resolution of an acoustio-optical spectrometer system under influences of deflector's spectral resolution, coherent light-beam truncation ratio, and photodiode array's 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, bandwith, and sidelobes of instrumental profile comprehensively. An experimental measurement of the frequency resolution to verify above theoritical computations has also been carried out.
出处
《声学学报》
EI
CSCD
北大核心
1990年第4期299-303,共5页
Acta Acustica
