Polarization-insensitive dichroic filter for automatic optical inspection of printed circuit boards

YaPing Li; Cheng-Chung Lee

doi:10.1117/1.2424918

1 January 2007 Polarization-insensitive dichroic filter for automatic optical inspection of printed circuit boards

YaPing Li, Cheng-Chung Lee

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Optical Engineering, Vol. 46, Issue 1, 013801 (January 2007). https://doi.org/10.1117/1.2424918

Abstract

A polarization-insensitive dichroic filter was designed and fabricated at an angle of 45 deg with a slope of 13.0 and an average transmittance of 96.41% for a wavelength range about 300 nm for use in the automatic optical inspection (AOI) of a printed circuit board. The filter supports the inspection of PCBs with a high signal-to-noise ratio. The AOI had a resolution of 25.39 line pairs/mm in the tangential and sagittal directions.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

YaPing Li and Cheng-Chung Lee "Polarization-insensitive dichroic filter for automatic optical inspection of printed circuit boards," Optical Engineering 46(1), 013801 (1 January 2007). https://doi.org/10.1117/1.2424918

Published: 1 January 2007

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KEYWORDS

Optical filters

Electronic filtering

Signal to noise ratio

Transmittance

Optical inspection

Dielectric filters

Luminescence

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