An optimized optical system for backlit imaging

An optimized optical system for back-illuminated imaging was developed and was applied to automotive-type fuel injectors; the system provides significantly higher light collection efficiency than standard flood illumination. An engineered diffuser is used to distribute an extended light source throu...

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Bibliographic Details
Published in:Review of scientific instruments 2009-05, Vol.80 (5), p.056105-056105-3
Main Authors: Ghandhi, J. B., Heim, D. M.
Format: Article
Language:English
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Summary:An optimized optical system for back-illuminated imaging was developed and was applied to automotive-type fuel injectors; the system provides significantly higher light collection efficiency than standard flood illumination. An engineered diffuser is used to distribute an extended light source through a controlled range of angles, and a field lens is used to redirect the light to the camera. A ray tracing analysis provides the required source size and diffuser angle to ensure that the necessary range of ray angles is included to allow fully diffuse imaging. Direct comparison with a flood illumination system showed that the collection efficiency increased by more than two orders of magnitude without any degradation of image quality.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3128728