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Building a Two-Way Hyperspectral Imaging System with Liquid Crystal Tunable Filters

机译：建立具有液晶可调过滤器的双向高光谱成像系统

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摘要

Liquid crystal tunable filters can provide rapid and vibration-less section of any wavelength in transmitting spectrum so that they have been broadly used in building multispectral or hyperspectral imaging systems. However, the spectral range of the filters is limited to a certain range, such as visible or near-infrared spectrum. In general hyperspectral imaging applications, we are therefore forced to choose a certain range of target spectrum, either visible or near-infrared for instance. Owing to the nature of polarizing optical elements, imaging systems combined with multiple tunable filters have been rarely practiced. In this paper, we therefore present our experience of building a two-way hyperspectral imaging system with liquid crystal tunable filters. The system allows us to capture hyperspectral radiance continuously from visible to near-infrared spectrum (400 - 1100 nm at 7nm intervals), which is 2.3 times wider and 34 times more channels compared to a common RGB camera. We report how we handle the multiple polarizing elements to extend the spectral range of the imager with the multiple tunable filters and propose an affine-based method to register the hyperspectral image channels of each wavelength.
机译：液晶可调滤光器可以提供快速和振动的横振，在传输频谱中的任何波长部分，使它们广泛用于构建多光谱或高光谱成像系统。然而，滤波器的光谱范围限于一定范围，例如可见或近红外光谱。因此，在一般的高光谱成像应用中，我们被迫选择一定的目标光谱，例如可见或近红外。由于偏振光学元件的性质，很少实践与多个可调谐过滤器结合的成像系统。在本文中，我们展示了我们用液晶可调过滤器构建双向高光谱成像系统的经验。该系统允许我们连续地从近红外光谱（400-1100nm以7nm间隔）连续捕获高光谱辐射，与普通的RGB相机相比，该通道比较宽的2.3倍。我们报告了我们如何处理多个偏振元件以利用多个可调滤波器扩展成像器的频谱范围，并提出基于仿射的方法来注册每个波长的高光谱图像通道。

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