Kudenov Michael W, Jungwirth Matthew E L, Dereniak Eustace L, Gerhart Grant R
College of Optical Science, The University of Arizona, 1630 E. University Boulevard, Tucson, Arizona 85721, USA.
Appl Opt. 2010 Jul 20;49(21):4067-76. doi: 10.1364/AO.49.004067.
The theoretical and experimental demonstration of a multispectral Sagnac interferometer (MSI) is presented. The MSI was created by including two multiple-order blazed diffraction gratings in both arms of a standard polarization Sagnac interferometer (PSI). By introducing these high-order diffractive structures, unique spectral passbands can be amplitude modulated onto coincident carrier frequencies. Extraction of the modulated multispectral images, corresponding to each passband, is accomplished within the Fourier domain. This yields a unique multispectral sensor capable of imaging all the passbands in a single snapshot. First, the theoretical operating principles of a PSI are discussed to provide a context for the MSI. This is followed by the theoretical and experimental development of the MSI, which is an extension of a dispersion-compensated PSI. Indoor and outdoor testing and validation of the MSI are performed by observing vegetation, demonstrating the ability of our experimental setup to detect four distinct spectral passbands.
本文介绍了一种多光谱萨格纳克干涉仪（MSI）的理论和实验演示。该MSI是通过在标准偏振萨格纳克干涉仪（PSI）的双臂中加入两个多阶闪耀衍射光栅而制成的。通过引入这些高阶衍射结构，可以将独特的光谱通带幅度调制到重合的载波频率上。在傅里叶域内完成对应于每个通带的调制多光谱图像的提取。这产生了一种独特的多光谱传感器，能够在单次快照中对所有通带进行成像。首先，讨论了PSI的理论工作原理，为MSI提供背景。接着是MSI的理论和实验发展，它是色散补偿PSI的扩展。通过观察植被对MSI进行室内和室外测试与验证，证明了我们的实验装置能够检测四个不同的光谱通带。
