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首页> 外文会议>SPIE Conference on Emerging Digital Micromirror Device Based Systems and Applications >Full-frame programmable spectral filters based on micro-mirror arrays
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Full-frame programmable spectral filters based on micro-mirror arrays

机译：基于微镜阵列的全帧可编程光谱滤波器

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Rapidly programmable micro-mirror arrays, such as the DLP? digital micro-mirror device (DMD), have opened an exciting new arena in spectral imaging: rapidly reprogrammable, high spectral resolution, multi-band spectral filters that perform spectral processing directly in the optical hardware. Such a device is created by placing a DMD at the spectral plane of an imaging spectrometer, and using it as a spectral selector that passes some wavelengths down the optical train to the final image and rejects others. While simple in concept, realizing a truly practical DMD-based spectral filter has proved challenging. Versions described to date have been limited by the intertwining of image position and spectral propagation direction common to most imaging spectrometers, reducing these instruments to line-by-line scanning imagers rather than true spectral cameras that collect entire two-dimensional images at once. Here we report several optical innovations that overcome this limitation and allow us to construct full-frame programmable filters that spectrally manipulate every pixel, simultaneously and without spectral shifts, across a full 2D image. So far, our prototype, which can be programmed either as a matched-filter imager for specific target materials or as a fully hyperspectral multiplexing Hadamard transform imager, has demonstrated over 100 programmable spectral bands while maintaining good spatial image quality. We discuss how diffraction-mediated trades between spatial and spectral resolution determine achievable performance. Finally, we describe methods for dealing with the DLP’s 2D diffractive effects, and suggest a simple modification to the DLP that would eliminate their impact for this application.
机译：快速可编程微镜阵列，如DLP？数字微镜设备（DMD），在光谱成像中打开了令人兴奋的新舞台：快速再编程，高频谱分辨率，多带频谱滤波器，可直接在光学硬件中执行光谱处理。通过将DMD放置在成像光谱仪的光谱平面上，并将其用作光谱选择器来创建这样的设备，该光谱选择器将光学序列向下传递到最终图像并拒绝其他的频谱选择器。虽然简单的概念，实现了真正实际的基于DMD的谱过滤器已经证明了具有挑战性。迄今描述的版本受到在大多数成像光谱仪中的图像位置和光谱传播方向的限制，将这些仪器减少到逐行扫描成像仪，而不是一次收集整个二维图像的真实光谱相机。在这里，我们报告了几种光学创新，克服了这种限制，并允许我们构建全帧可编程过滤器，该过滤器在完整的2D图像上同时和没有光谱移位的频谱操作每个像素的每个像素。到目前为止，我们的原型可以作为特定目标材料的匹配过滤器成像器或作为完全高光谱复用Hadamard变换器的原型已经在100多个可编程光谱带上展示了超过100个可编程光谱带，同时保持良好的空间图像质量。我们讨论空间和光谱分辨率之间的衍射介导的交易如何确定可实现的性能。最后，我们描述了处理DLP的2D衍射效果的方法，并表明对DLP的简单修改，这将消除其对该应用的影响。

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