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Proceedings Article

Fiber-optic confocal probe with an integrated real-time apex finder for high-precision center thickness measurement of ball lenses

[+] Author Affiliations
Armote Somboonkaew, Ratthasart Amarit, Sataporn Chanhorm

National Electronics and Computer Technology Ctr. (Thailand)

Boonsong Sutapun

Suranaree Univ. of Technology (Thailand)

Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85630M (November 20, 2012); doi:10.1117/12.999967
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From Conference Volume 8563

  • Optical Metrology and Inspection for Industrial Applications II
  • Kevin G. Harding; Peisen S. Huang; Toru Yoshizawa
  • Beijing, China | November 05, 2012

abstract

This paper describes the development of a fiber-optic confocal probe suitable to measuring the central thickness of highcurvature small-diameter optical ball lenses. The confocal probe utilizes an integrated camera that functions as a realtime apex-sensing device. An additional camera is used to monitor the shape of the reflected light beam. Placing the instrument sensing spot off-center from the apex will produce a non-circular image at the camera plane that closely resembles an ellipse for small displacement. By analyzing the shape of the reflected light spot, we are able to precisely determine the focus point of the confocal probe relative to the apex point to better than 2-μm precision for ball lenses with diameters in the range of 3 – 10 mm. The proposed confocal probe offers a low-cost alternative technique for quality control of ball lenses during the manufacturing process. © (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Armote Somboonkaew ; Ratthasart Amarit ; Sataporn Chanhorm and Boonsong Sutapun
" Fiber-optic confocal probe with an integrated real-time apex finder for high-precision center thickness measurement of ball lenses ", Proc. SPIE 8563, Optical Metrology and Inspection for Industrial Applications II, 85630M (November 20, 2012); doi:10.1117/12.999967; http://dx.doi.org/10.1117/12.999967


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