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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 12 — Dec. 19, 2012

Laser divided-aperture differential confocal sensing technology with improved axial resolution

Weiqian Zhao, Chao Liu, and Lirong Qiu  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 25979-25989 (2012)
http://dx.doi.org/10.1364/OE.20.025979


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Abstract

In this study, we found that the axial response curve of divided-aperture confocal microscopy has a shift while the point detector has a transverse offset from the optical axis. Based on this, a novel laser divided-aperture differential confocal sensing technology (LDDCST) with absolute zero and high axial resolution, as well as an LDDCST-based sensor, is proposed. LDDCST sets two micro-regions as virtual pinholes that are symmetrical to the optical axis along the xd direction on the focal plane of the divided-aperture confocal system to achieve the spot-division detection and to simplify the detection system, uses differential subtraction of two intensity responses simultaneously detected from the two micro-regions to achieve high axial resolution absolute measurement and low noise, and considers both resolution and measurement range by adjusting virtual pinholes in software. Theoretical analyses and packaged LDDCST sensor experiments indicate that LDDCST has high axial resolution as well as strong anti-interference and sectioning detection capability.

© 2012 OSA

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(120.6660) Instrumentation, measurement, and metrology : Surface measurements, roughness
(130.6010) Integrated optics : Sensors
(180.1790) Microscopy : Confocal microscopy

ToC Category:
Microscopy

History
Original Manuscript: September 7, 2012
Revised Manuscript: October 21, 2012
Manuscript Accepted: October 23, 2012
Published: November 2, 2012

Virtual Issues
Vol. 7, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Weiqian Zhao, Chao Liu, and Lirong Qiu, "Laser divided-aperture differential confocal sensing technology with improved axial resolution," Opt. Express 20, 25979-25989 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-20-23-25979


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