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Narrow band pass filter using Birefringence film and quarter-wave film

机译：使用双折射膜和四分之一波长膜的窄带通滤波器

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摘要

While a pixel in a color image has three colorimetric information of RGB, that in a spectral image contains full spectral information, several tens times more information compared to the color image. Hence, the spectral image is widely applicable in biology, material science, and environmental science. Although several methods for spectral image acquisition have been suggested to date, those methods are expensive, bulky, or slow in actual device. In this work, we designed a novel type of tunable narrow band-pass filter using rotatable polarizer, quarter-wave plate, and birefringence films. Different from the conventional Lyot-Ohman type filter, we do not use a liquid crystal layer. The selection of wavelength is made by rotating the polarizer in our filter set, and adopted a piezoelectric rotational actuator for that. We simulated to find the optimal conditions of the filter set, and finally, fabricated a filter module. The minimum band width was 5 nm, which is suitable for usual spectral imaging and can be reduced further if necessary, and the wavelength of light passing through the filter set was continuously selectable. After setting the filter in a microscope, we obtained a spectral image set for a bio sample that contained full spectrum information in each pixel. Using image processing, we could demonstrate to read out the spectral information for any selected position.
机译：彩色图像中的像素具有RGB的三个比色信息，而光谱图像中的像素包含完整的光谱信息，但与彩色图像相比，其信息要多几十倍。因此，光谱图像可广泛应用于生物学，材料科学和环境科学。尽管迄今为止已经提出了几种获取光谱图像的方法，但是这些方法昂贵，笨重或在实际设备中运行缓慢。在这项工作中，我们使用可旋转的偏振器，四分之一波片和双折射膜设计了一种新型的可调窄带通滤波器。与传统的Lyot-Ohman型滤光片不同，我们不使用液晶层。波长的选择是通过旋转滤光片组中的起偏器进行的，并为此采用了压电旋转致动器。我们进行仿真以找到滤波器组的最佳条件，最后制造出一个滤波器模块。最小带宽为5 nm，适用于常规光谱成像，必要时可以进一步减小，并且可以连续选择通过滤光片组的光的波长。在显微镜下设置滤光片后，我们获得了一个生物样品的光谱图像集，该图像在每个像素中都包含完整的光谱信息。使用图像处理，我们可以演示读取任何选定位置的光谱信息。

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