小型线形可变滤光片分光的可见成像光谱仪及其特性研究

本文设计了一种使用线形可变干涉滤光片的小型成像光谱仪。使用CCD摄像头作图像传感器，通过微动平台带动线形可变干涉滤光片，横向扫描通过面阵CCD的每个像元，每扫描一步所得到的总体图像中不同列的像元是由不同波长的单色部分像元组成，随着扫描步进，这些单色部分像元的波长随之变化，最后采用图像重构的文教是到一系列单色图像（或见光波段400－700mm）。扫描间隔由所需的单色图像的光谱分辨率和各单色图像间的波长间隔来确定。经过试验证明，此成像光谱仪充分利用了线型干涉滤光片的性能，其光谱分辨率为16nm，同后者的光谱带宽相差无几，仪器的空间分辨率由成像系统和CCD来确定，论仪器装置具有结构简单，高空间分辨率，较主光谱分辨率，扫描速度快等特点，通过一个伪装识别试验，验证了仪器的性能指标。

Research of Image Spectrometer using Linear Variable Interference Filter

In the present work we have designed a small-size portable imaging spectrometer using linear variable interference filter,with CCD camera as picture sensor,and micromotion stage to bring along interference filter which scan across every pixel of CCD array.The difference column pixel in the picture which we get at every step is monocolour partial image under different wavelength,with the step by step,these column monocolour pixels change the wavelength.And finally we reassembled these images and get the whole monocolour image with different wavelength.The interval of sweep step length decided by the required spectrum resolution and the required wavelength interval of different pictures.The experiment demonstrated the resolution of this spectrometer is about 16 nm,but that major reason of the limiting resolution is the band width of the linear variable interference filter.The spatial resolution of the instrument ultimately decided by CCD,filter and imaging lens.This spectrometer has some characters such as compact structure,higher spatial resolution,higher spectrum resolution,higher scan rate and so on.Furthermore,an application of this instrument in distinguishing from camouflage have been showed.