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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Design and Calibration of Liquid Crystal Tunable Filter Based Spectral Imaging System
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Design and Calibration of Liquid Crystal Tunable Filter Based Spectral Imaging System

机译：基于液晶可调滤波器的光谱成像系统的设计与校准

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摘要

As evidence of hyperspectral and multispectral imaging for the quality inspections of food and agricultural products accumulates, the design and calibration of a spectral imaging device is gaining increasing interest. Liquid crystal tunable filter (LCTF) based spectral imaging, an important branch of modern spectral imaging, has many advantages in food quality and safety inspections. This paper presents the design, integration, and calibration of an LCTF based shortwave infrared spectral imaging system. The system consists of an LCTF, an InGaAs camera, a near-infrared lens, an illumination unit, and the data acquisition software. It was designed to capture hyperspectral or multispectral images in the spectral range of 900 - 1700 nm. The principles and key points of designing the LCTF-based spectral imaging system are summarized and discussed. A series of tests were conducted to calibrate the linearity of the system output, measure the field of view, enhance the system spectral sensitivity, measurethe spatial and spectral resolution of the system, evaluate the stability of the system, the image distortion, and reduce the spectral noise of the system output. Results of calibration tests indicated that this system satisfied the design criteria for both spatial and spectral domains. The presented design and calibration methodologies are applicable to the electronic filter-based spectral imaging systems in other applications.
机译：至于食品和农产品累计质量检查和高光谱多光谱成像的证据，光谱成像设备的设计和校准获得越来越多的关注。液晶可调谐滤波器（LCTF）的光谱成像，现代光谱成像的一个重要分支，在食品质量和安全检查的许多优点。本文介绍了设计，集成和LCTF基于短波红外校准光谱成像系统。该系统包括一个LCTF，的InGaAs相机，近红外线透镜，照明单元，和数据采集软件。它被设计在900的光谱范围内来捕获高光谱或光谱图像 - 1700纳米。的原理和设计基于LCTF光谱成像系统的关键点总结和讨论。一系列的试验以校准系统输出的线性，测量视场，提高了系统的频谱灵敏度，所述系统的measurethe空间和光谱分辨率，评价系统中，图像失真的稳定性，并降低系统输出的频谱噪声。的校准测试结果表明，该系统满足了这两个空间和光谱域的设计标准。所提出的设计和校准方法适用于在其他应用中的电子基于过滤器的光谱成像系统。

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