Hyperspectral Lighting Design for Industrial Applications

The paper raises the issue of lighting in industrial hyperspectral imaging. In the first part of the article, based on the literature review, a general overview of hyperspectral imaging is presented. Examples of applications of this unique technology are briefly listed. Despite significant progress in the area of data analysis and hyperspectral cameras, much remains to be done in terms of reliability and adaptation to industrial conditions. The authors emphasize the role of lighting in machine vision systems. Existing illumination solutions are described, along with their advantages and limitations. Due to specific requirements to be met in the case of hyperspectral imaging the authors propose two types of lighting devices. The prototype of a general usage halogen illuminator characterized by spatial uniformity and broadband spectral range is described in detail. The last part of the article presents the process of designing a dedicated illuminator along with the method of selecting relevant spectral bands for a particular application.