期刊
出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2020.06.017
关键词
Multi-channel microlens array; Modulated slow-tool-servo diamond turning; Precision glass molding; Infrared imaging; Large field-of-view microlens array
类别
资金
- National Science Foundation (NSF) [1537212]
- Ohio State University (OSU)
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1537212] Funding Source: National Science Foundation
Bionic artificial compound eyes inspire a promising field of miniaturized imaging systems. In this research, a novel infrared (IR) three-dimensional (3D) compound eye imaging system, consisting of a double-side molded 3D microlens array and an aperture array, was designed and fabricated by combining modulated slow-tool-servo diamond turning and precision glass molding. To facilitate the complex profiles on the mold inserts, two novel slow-tool-servo strategies were adopted, namely virtual-axis based diamond broaching and adaptive diamond turning. This microlens array consists of 3 x 3 channels for a field of view of 48 x 48 with a thickness of 1.8 mm. The freeform microlens array on a flat surface was employed to steer and focus the incident light from all three dimensions to a two-dimension (2D) infrared imager. Using raytracing, the profiles of the freeform microlenses of each channel were optimized to obtain the best imaging performance. To avoid crosstalk among adjacent channels, a 3D printed three-dimensional micro aperture array was mounted between the microlens array and the IR imager. The imaging tests of the infrared compound-eye imaging system using the molded chalcogenide glass lenses showed that the asymmetrical freeform lenslets were capable of steering and forming images within the designed field of view. Compared to a conventional infrared camera, this novel microlens array can achieve a considerably larger field-of-view while maintaining low manufacturing cost without sacrificing image quality.
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