基于AOTF的成像光谱仪及其在同色异谱目标鉴别中的应用

为了同时获得同色异谱目标的光谱信息和空间分布信息，设计了基于声光可调谐滤波器(acousto-optic tunable filter, AOTF)的成像光谱仪，主要包括前置成像透镜组、AOTF滤光成像模块、AOTF驱动器、CCD图像检测器、图像采集卡和计算机。在计算机的控制下，实现波长的快速扫描，获取每个设定波段下的灰度图像，构建一个光谱图像立方体，因此可以获得图像中任意一点的光谱信息。所设计的成像光谱仪，光谱范围为550 ～1 000 nm，光谱分辨率2.6 nm(@632 nm)，光谱扫描速度快，任意两个波长之间的切换时间小于80 μs，整个仪器无机械运动部件，功耗低，抗振能力强。利用该仪器对真假玫瑰花进行了鉴别试验，对涂改物证进行了信息复原实验，并成功地辨别出真假玫瑰花和复原出涂改物证，证实了该成像光谱仪具有优异的同色异谱目标鉴别本领，在同色异谱物质的鉴别上具有广阔的应用前景。

AOTF-Based Imaging Spectrometer and Its Applications in the Identification of Metameric Targets

For obtaining spectrum information and space distribution information of metameric targets at the same time, an AOTF-based imaging spectrometer was developed, which consists of a front imaging lens assembly, an AOTF filter imaging module, an AOTF driver, a plane array CCD, an image acquisition card and a PC. Under the control of the PC, a spectral image cube can be obtained by a fast wavelength scanning process, thereby the spectrum information of any point on the image is available. The developed imaging spectrometer, with a spectral range from 550~1 000 nm and a spectral resolution of 2.6 nm(@632 nm), and a less than 80 s switch time between any two wavelengths, has the characteristics of no mechanical moving part, low power dissipation and strong vibration resistance. The identification test of true and false roses and the information recovery experiment of altered physical evidence were carried out, The true and false roses were identified and the altered physical evidence was recovered, The experimental results showed that the imaging spectrometer has an excellent ability of identifying metameric targets, indicating a good application prospect.