多光谱遥感探测波段的细化和增加, 要求提高图像的采集和传输速度, 原有的波长调谐方法和接口规范已不能满足需要。提出了一种新的基于液晶可调谐滤光片(LCTF)的多光谱图像采集系统。该系统的成像部分用液晶可调谐滤光片替代传统的机械转轮滤光片, 这种滤光片是电可调谐的, 能在 400～720 nm波长范围内快速准确地实现16个波长的任意调谐, 其最快响应时间达 50 ms; 系统的采集控制部分遵循支持高速数据传输的Camera Link接口规范和PCI总线标准, 使得嵌入式计算机能通过程序实时控制波长调谐、相机曝光时间设置及图像采集和存储。系统具有体积小、功耗低、稳定性高、采集速度快等特点, 能够在机载、艇载等平台上工作, 可用于低空遥感、环境监测等领域的研究。

In remote sensing, the subdivision and increase of detecting bands require to enhance the acquisition and transmission speed of image. This makes the old wavelength tuning method and interface specification can not meet the need. A new multispectral image acquisition system based on liquid crystal tunable filter (LCTF) is proposed. In this system, LCTF is used to substitute traditional filter wheel. It is electronically tunable and allows for the rapid, accuracy and vibrationless selection of any wavelength in the range of 400～720 nm, and its fastest response time can be up to 50 ms. And the system follows the Camera Link specification and the PCI bus standard, which makes the embedded computer realize real-time control of the wavelength tuning of LCTF, the exposure time setting of the camera and the acquisition and storage of image data by program. The whole system characterized by small volume, low power consumption, high stability and high acquisition speed. The system could work on plane and airship platforms, and it′s suitable for researching in the fields of low altitude remote sensing and environmental monitoring.