Xu Xiao-xuan, Lin Hai-bo, Yu Gang, Zhu Jian, Zhang Cun-zhou, Zhang Guang-yin
Photonics Center, Nankai University, Tianjin 300071, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Oct;22(5):713-7.
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.
在本工作中，我们设计了一种小型便携式成像光谱仪，它使用线性可变干涉滤光片，以电荷耦合器件（CCD）相机作为图像传感器，并带有微移动平台来带动干涉滤光片扫过CCD阵列的每个像素。我们在每一步所获得图像中的差分列像素是不同波长下的单色部分图像，随着步骤推进，这些列单色像素改变波长。最后我们重新组合这些图像，得到具有不同波长的完整单色图像。扫描步长间隔由所需的光谱分辨率和不同图像所需的波长间隔决定。实验表明该光谱仪的分辨率约为16纳米，但限制分辨率的主要原因是线性可变干涉滤光片的带宽。该仪器的空间分辨率最终由CCD、滤光片和成像镜头决定。这种光谱仪具有结构紧凑、空间分辨率较高、光谱分辨率较高、扫描速率较高等特点。此外，还展示了该仪器在伪装识别方面的应用。
