基于LCTF的便携式多光谱成像仪

选用商品化照相机镜头、液晶可调谐滤光片（Liquid Crystal Tunable Filter，LCTF）和单色面阵CCD相机，将LCTF置于由镜头和CCD相机组成的照相光路中构成便携式多光谱成像仪，该多光谱成像仪能够在被动和主动光源下进行多光谱图像数据采集，工作波长范围是400-720nm，光谱分辨率为10nm，建立了多光谱成像仪系统多光谱图像采集数值模型，分析了误差源，为系统定标提供了理论依据。最后在自然光照条件下进行了盆景植物的多光谱图像采集试验，重建出多光谱数据立方体，绘制了典型目标点的光谱曲线。

Portable Multispectral Imager Based on LCTF

A new type of portable multispectral imager consisting of off the Shelf focal plane arrays CCD camera, camera lens and Liquid Crystal Tunable Filter (LCTF) is presented.The LCTF used as a dispersion element is placed between the camera lens and CCD camera. This multispectral imager can perform multispectral image data acquisition experiment under active and passive illuminating condition, the spectrum range is 400-720nm, and the spectral resolution is 10nm.The numerical model of multispectral image acquisition is formulated, and the source of error is analyzed. A multispectral image data acquisition experiment under natural lighting condition is carried out, the target is a plant in pot, a multispectral image datacube is constructed and the spectrum of typical object point is illustrated.