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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 22 — Nov. 15, 2013
  • pp: 4694–4697

Spectrally multiplexed chromatic confocal multipoint sensing

Matthias Hillenbrand, Lucia Lorenz, Roman Kleindienst, Adrian Grewe, and Stefan Sinzinger  »View Author Affiliations

Optics Letters, Vol. 38, Issue 22, pp. 4694-4697 (2013)

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We present a concept for chromatic confocal distance sensing that employs two levels of spectral multiplexing for the parallelized evaluation of multiple lateral measurement points; at the first level, the chromatic confocal principle is used to encode distance information within the spectral distribution of the sensor signal. For lateral multiplexing, the total spectral bandwidth of the sensor is split into bands. Each band is assigned to a different lateral measurement point by a segmented diffractive element. Based on this concept, we experimentally demonstrate a chromatic confocal three-point sensor that is suitable for harsh production environments, since it works with a single-point spectrometer and does not require scanning functionality. The experimental system has a working distance of more than 50 mm, a measurement range of 9 mm, and an axial resolution of 50 μm.

© 2013 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(120.2830) Instrumentation, measurement, and metrology : Height measurements
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(150.6910) Machine vision : Three-dimensional sensing
(180.1790) Microscopy : Confocal microscopy

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 5, 2013
Revised Manuscript: September 25, 2013
Manuscript Accepted: October 3, 2013
Published: November 11, 2013

Virtual Issues
Vol. 9, Iss. 1 Virtual Journal for Biomedical Optics

Matthias Hillenbrand, Lucia Lorenz, Roman Kleindienst, Adrian Grewe, and Stefan Sinzinger, "Spectrally multiplexed chromatic confocal multipoint sensing," Opt. Lett. 38, 4694-4697 (2013)

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