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Sensors 2016, 16(4), 458; doi:10.3390/s16040458

Optical Riblet Sensor: Beam Parameter Requirements for the Probing Laser Source

1
Department of Physics, Osnabrueck University, Barbarastrasse 7, Osnabrueck 49076, Germany
2
Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen 28359, Germany
3
Caesar Research Center, Ludwig-Erhard-Allee 2, Bonn 53175, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 25 January 2016 / Revised: 23 March 2016 / Accepted: 24 March 2016 / Published: 30 March 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [13856 KB, uploaded 30 March 2016]   |  

Abstract

Beam parameters of a probing laser source in an optical riblet sensor are studied by considering the high demands on a sensors’ precision and reliability for the determination of deviations of the geometrical shape of a riblet. Mandatory requirements, such as minimum intensity and light polarization, are obtained by means of detailed inspection of the optical response of the riblet using ray and wave optics; the impact of wavelength is studied. Novel measures for analyzing the riblet shape without the necessity of a measurement with a reference sample are derived; reference values for an ideal riblet structure obtained with the optical riblet sensor are given. The application of a low-cost, frequency-doubled Nd:YVO4 laser pointer sufficient to serve as a reliable laser source in an appropriate optical riblet sensor is discussed. View Full-Text
Keywords: optical riblet sensor; wave fronts and ray tracing; drag reduction; laser beam parameters; riblet degradation optical riblet sensor; wave fronts and ray tracing; drag reduction; laser beam parameters; riblet degradation
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Tschentscher, J.; Hochheim, S.; Brüning, H.; Brune, K.; Voit, K.-M.; Imlau, M. Optical Riblet Sensor: Beam Parameter Requirements for the Probing Laser Source. Sensors 2016, 16, 458.

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