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Proceedings Paper

Multi-layer surface profiling using gated wavefront sensing
Author(s): Xin Wang; Nur Dalilla Nordin; Eddy Chow Mun Tik; ChingSeong Tan; Kuew Wai Chew; Carmen Menoni
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Paper Abstract

Recently, multi-layer surface profiling and inspection has been considered an emerging topic that can be used to solve various manufacturing inspection problems, such as graded index lenses, TSV (Thru-Silicon Via), and optical coating. In our study, we proposed a gated wavefront sensing approach to estimate the multi-layer surface profile. In this paper, we set up an experimental platform to validate our theoretical models and methods. Our test bed consists of pulse laser, collimator, prism, well-defined focusing lens, testing specimen, and gated wavefront sensing assembly (e.g., lenslet and gated camera). Typical wavefront measurement steps are carried out for the gated system, except the reflectance is timed against its time of flight as well as its intensity profile. By synchronizing the laser pulses to the camera gate time, it is possible to discriminate a multi-layer wavefront from its neighbouring discrete layer reflections.

Paper Details

Date Published: 7 January 2015
PDF: 6 pages
Proc. SPIE 9442, Optics and Measurement Conference 2014, 94421K (7 January 2015); doi: 10.1117/12.2176174
Show Author Affiliations
Xin Wang, Monash Univ. Malaysia (Malaysia)
Nur Dalilla Nordin, Monash Univ. Malaysia (Malaysia)
Eddy Chow Mun Tik, Monash Univ. Malaysia (Malaysia)
ChingSeong Tan, Multimedia Univ. (Malaysia)
Kuew Wai Chew, Univ. Tunku Abdul Rahman (Malaysia)
Carmen Menoni, Colorado State Univ. (United States)

Published in SPIE Proceedings Vol. 9442:
Optics and Measurement Conference 2014
Jana Kovačičinová; Tomáš Vít, Editor(s)

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