面向火星探测, 设计并研制了一种基于声光可调谐滤波器(AOTF)原理的成像光谱仪地面原理样机。该样机由前置光机系统和后置电子学系统组成, 光学系统采用消色差远心光路结构, 工作波段为550~1 000 nm, 光谱分辨率为0.9~4.0 nm。在电子学系统中引入可编程片上系统技术, 并设计了新型SpaceWire高速总线接口用于数据传输。样机在实验室定标的基础上, 搭载于模拟火星探测器上进行了成像试验。试验结果表明: 样机成像质量良好; 与ASD光谱仪的一致性对比检验表明, 光谱测量准确可靠, 两者数据匹配精度超过96%。SpaceWire接口实现了100 Mb/s数据率的稳定传输, 满足设计指标25 Mb/s的要求。样机的研制为AOTF成像光谱技术在火星遥感探测领域的应用奠定了技术基础。

For mars exploration, a novel prototype of imaging spectrometer consisting of an optomechanical subsystem and an electronic subsystem was designed based on an Acousto-optic Tunable Filter(AOTF). An achromatic telescopic optical system was used in the spectrometer and its spectral range was between 550 nm and 1 000 nm, while the spectral resolution was 0.9-4 nm. In electronic subsystem, a system-on-a-programmable-chip was introduced and data transmission was implemented by employing a novel bus technology of SpaceWire. On the basis of laboratory calibration, the prototype was installed in the stimulant mars explorer, and a hyperspectral imaging experiment was performed. Experimental results indicate that the prototype of imaging spectrometer can offer good imaging quality and the measurement identify between the prototype and an ASD spectrometer is over 96%. Furthermore, the SpaceWire bus can transport data at a rate of 100 Mbps continuously, which satisfies the technique requirement of 25 Mbps. The development of the prototype provides technical foundation for applications of AOTF imaging spectral technique to mars-based remote sensing in future.