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Film Strain Measurement through Hyperspectral Polarimetry

机译：通过高光谱偏振基膜应变测量

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A new method and instrumentation is presented for passively monitoring the strain in thin polymeric films using polarized light. The method has been designed for strain monitoring gore material in scientific balloons, for which scattered sunlight can provide the necessary source of linearly polarized light. No modifications or attachments to the polymer film are necessary. Real-time strain maps are generated through hyperspectral imaging, in which a full visible spectrum is recorded for each pixel of an image. Point differential strain measurement is extracted from each pixel spectrum based on known light polarization orientation and calculated optical retardation produced by film birefringence. The optical retardation is determined by curve-fitting the transmission spectra through the film for each pixel in the composite image. Measurements demonstrate the capability of the system to accurately measure film strain within one minute of film deformation. No measurement hysteresis was evident during strain cycling tests. Strain measurement was still possible when the imaging light was only 50% polarized
机译：提出了一种使用偏振光被动地监测薄聚合物膜中的菌株的新方法和仪器。该方法设计用于科学气球中的应变监测血压材料，其散射的阳光可以提供线性偏振光的必要源。不需要对聚合物膜的修改或附着物。通过高光谱成像产生实时应变映射，其中记录图像的每个像素的完整可见光谱。基于所知道的光偏振取向和通过胶片双折射产生的光学延迟，从每个像素光谱提取点差分应变测量。通过曲线拟合透射光谱通过用于复合图像中的每个像素的膜来确定光学延迟。测量证明了系统在膜变形一分钟内精确地测量膜应变的能力。在应变循环试验期间没有测量滞后是明显的。当成像光仅为50％极化时，仍有可能仍有可能

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