@techreport{oai:jaxa.repo.nii.ac.jp:00043542,
 author = {笠木, 伸英 and 西野, 耕一 and Kasagi, Nobuhide and Nishino, Koichi},
 month = {Dec},
 note = {A three-dimensional particle tracking velocimeter (3-D PTV) for the measurement of turbulent shear flows is described with emphasis on its instrumentation, experimental procedure and data processing algorithm. Motions of neutrally buoyant tracer particles (Nylon 12, specific density of 1.02, typical diameter of 200mum) suspended in a water flow are tracked with a highly automated digital image processing system. Local fluid velocities are determined from 3-D displacement of each particle and the time interval over which particles are tracked. This technique is advantageous over existing one-point measuring techniques such as hot-wire/film probes and a laser Doppler velocimeter in that it can provide not only one-point turbulence statistics but also spatial information on the turbulence structures. Such feature is particularly desirable for the study of coherent turbulence structures which are considered to play a dominant roll in turbulence mechanism. Typical results obtained by the 3-D PTV in fundamental turbulent flows are presented to demonstrate practical capability of the technique. Some author's perspectives on future research direction of the 3-D PTV are also presented., 資料番号: NALSP0016046, レポート番号: NAL SP-16},
 title = {デジタル画像処理による剪断乱流の三次元計測},
 year = {1991}
}