基于AOTF的成像光谱仪是集图像、光谱及偏振信息为一体的新型探测仪器, 仪器的光谱传递函数是衡量仪器性能的一项重要指标。介绍了单AOTF型和双AOTF型成像光谱仪的工作原理, 利用光学域光谱透过函数, 推导了以波数Δv表示的单、双型AOTF光谱传递函数, 在工作波段为400 nm~900 nm内, 计算对比了单、双AOTF型光谱传递函数, 并对影响双AOTF型光谱传递函数的因素进行了仿真分析, 最后对仪器参数的选取进行了分析和讨论。结果表明: 在入射光极角30°, 声光互作用长度5 mm工作波段下, 当双AOTF型成像光谱仪工作中心波长相等时, 相比同一工作中心波长时的单AOTF型成像光谱仪, 光谱传递函数提高了68%; 当工作中心波长不相等时, 双AOTF型光谱传递函数并不绝对优于单AOTF型, 存在临界值。

The acoustic-optic tunable filter(AOTF)-based imaging spectrometer is a new type of detection instrument that integrates image, spectrum and polarization information. The spectral transfer function of the instrument is an important indicator to measure the performance of the instrument. This paper first introduces the working principle of single AOTF-type and dual AOTF-type imaging spectrometer. Then by using the optical domain spectral transmission function, the single and dual AOTF spectral transfer functions expressed by wave number are derived, and in the working band of 400 nm~900 nm,the single and dual AOTF-type spectral transfer functions are calculated and compared.Moreover,the factors affecting the dual AOTF-type spectral transfer function are simulated and analyzed. Finally, the selection of instrument parameters are analyzed and discussed. The results show that with the parameters of the incident light polar angle of 30°and the acousto-optic interaction length of 5 mm, when the wavelengths of the working centers of the dual AOTF imaging spectrometers are equal, the spectral transfer function is improved by 68% compared to the single AOTF imaging spectrometer at the same working center wavelength; when the working center wavelengths are not equal, the dual AOTF-type spectral transfer function is not absolutely superior to the single AOTF type, and there is a critical value.