22 February 2018 Ultra-compact micro-optical system for multispectral imaging
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Proceedings Volume 10545, MOEMS and Miniaturized Systems XVII; 105450V (2018) https://doi.org/10.1117/12.2295343
Event: SPIE OPTO, 2018, San Francisco, California, United States
Optical systems for remote sensing commonly employ the principle of multi-/hyperspectral imaging, which is based on the acquisition of a set of two-dimensional images with distinct spectral bands in the ultra-violet, visible and/or infrared domain. Novel applications in the fields of environmental and agricultural monitoring, surveillance and biomedical inspection require miniaturized systems with high spectral and spatial sampling that furthermore enable a single shot image acquisition. However, conventional high resolution multi-spectral imaging solutions rely on bulky setups and depend on scanning techniques. In this work, we propose a multi-spectral imaging concept based on a multi-aperture system approach combined with a slanted linear variable spectral filter in order to overcome these restrictions. In particular, we demonstrate the optical design, fabrication and testing of a highly-compact, cost-effective multispectral imaging system, which exploits state of the art micro-optical manufacturing techniques on wafer level. The developed demonstration system incorporates a conventional full-frame format image sensor, a commercially available linear variable spectral filter and a customized microlens-array. In addition, a tailored baffle array is utilized for preventing optical crosstalk between adjacent optical channels. The setup enables the single-shot acquisition of 66 spectral channels with a linear spectral sampling over an extended wavelength range of 450-850 nm. The compact system with a size of only 60 x 60 x 28 mm3 provides a large field of view of 68° and a spatial sampling of 400x400 pixels per channel. Finally, we demonstrate its capabilities for advanced object classification by utilizing a customized multispectral analysis tool.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Martin Hubold, Martin Hubold, René Berlich, René Berlich, Christin Gassner, Christin Gassner, Robert Brüning, Robert Brüning, Robert Brunner, Robert Brunner, } "Ultra-compact micro-optical system for multispectral imaging", Proc. SPIE 10545, MOEMS and Miniaturized Systems XVII, 105450V (22 February 2018); doi: 10.1117/12.2295343; https://doi.org/10.1117/12.2295343

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