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Optical riblet sensor: Beam parameter requirements for the probing laser source

: Tschentscher, J.; Hochheim, S.; Brüning, H.; Brune, K.; Voit, K.-M.; Imlau, M.

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Sensors. Online journal 16 (2016), No.4, Art. 458, 13 pp.
ISSN: 1424-8220
Journal Article, Electronic Publication
Fraunhofer IFAM ()

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.