caa a22 4500 477093507 CHVBK 20180405111521.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF00189050 doi (NATIONALLICENCE)springer-10.1007/BF00189050 Holographic sensor for measurement of wall velocity gradients [Elektronische Daten] [J. Millerd, J. Swienton, F. Unterscher, J. Trolinger, L. Smith, J. LaRue] Time-resolved measurements of skin friction and boundary layer turbulence are important to the design of more fuel efficient aircraft. In this paper we describe the design and testing of a holographic fan fringe sensor that can non-intrusively measure time-resolved velocity gradients near an aerodynamic surface. The holographic sensor produces a set of optical interference fringes inside the viscous sub-layer that form a fan rather than a linear array. Particles scattering light in the sub-layer produce a Doppler frequency that is a direct measurement of the velocity gradient and is proportional to aerodynamic shear stress and skin friction. The holographic recording condenses the optics necessary to form the fringes into a small 3-5 mm package, eliminates the need for optical access from behind the model, and produces a compact and robust sensor. Springer-Verlag, 1996 Millerd J. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut Swienton J. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut Unterscher F. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut Trolinger J. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut Smith L. Wright Laboratories, Wright-Patterson AFB, OH, USA aut LaRue J. Mechanical and Aerospace Engineering Dept., University of California, 92717, Irvine, CA, USA aut Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 469-476 0723-4864 21:6<469 1996 21 348 https://doi.org/10.1007/BF00189050 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00189050 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Millerd J. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut NATIONALLICENCE 700 1- Swienton J. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut NATIONALLICENCE 700 1- Unterscher F. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut NATIONALLICENCE 700 1- Trolinger J. MetroLaser, 18006 Skypark Cir. Suite 108, 92714, Irvine, CA, USA aut NATIONALLICENCE 700 1- Smith L. Wright Laboratories, Wright-Patterson AFB, OH, USA aut NATIONALLICENCE 700 1- LaRue J. Mechanical and Aerospace Engineering Dept., University of California, 92717, Irvine, CA, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 21/6(1996-11-01), 469-476 0723-4864 21:6<469 1996 21 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer