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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 5082–5085

Lock-in spectroscopy employing a high-speed camera and a micro-scanner for volumetric investigations of unsteady flows

Andreas Fischer, Raimund Schlüßler, Daniel Haufe, and Jürgen Czarske  »View Author Affiliations

Optics Letters, Vol. 39, Issue 17, pp. 5082-5085 (2014)

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Spectroscopic methods are established tools for nonintrusive measurements of flow velocity. However, those methods are either restricted by measuring pointwise or with low measurement rates of several hertz. To investigate fast unsteady phenomena, e.g., in sprays, volumetric (3D) measurement techniques with kHz rate are required. For this purpose, a spectroscopic technique is realized with a power amplified, frequency modulated laser and an Mfps high-speed camera. This allows fast continuous planar measurements of the velocity. Volumetric data is finally obtained by slewing the laser light sheet in depth with an oscillating microelectromechanical systems (MEMS) scanner. As a result, volumetric velocity measurements are obtained for 256×128×25 voxels over 14.4mm×7.2mm×6.5mm with a repetition rate of 1 kHz, which allows the investigation of unsteady phenomena in sprays such as transients and local velocity oscillations. The respective measurement capabilities are demonstrated by experiments. Hence, a significant progress regarding the data rate was achieved in spectroscopy by using the Mfps high-speed camera, which enables new application fields such as the analysis of fast unsteady phenomena.

© 2014 Optical Society of America

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.7250) Remote sensing and sensors : Velocimetry
(140.3518) Lasers and laser optics : Lasers, frequency modulated

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: June 12, 2014
Revised Manuscript: July 29, 2014
Manuscript Accepted: July 29, 2014
Published: August 20, 2014

Andreas Fischer, Raimund Schlüßler, Daniel Haufe, and Jürgen Czarske, "Lock-in spectroscopy employing a high-speed camera and a micro-scanner for volumetric investigations of unsteady flows," Opt. Lett. 39, 5082-5085 (2014)

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