抄録
High time-resolution flow field measurements in a micro-flow is performed by a micro digital-holographic particle-tracking velocimetry (micro-DHPTV) method. The system consists of an objective lens, a high-speed camera, and a single high-frequency double pulsed laser. Particle positions in a three-dimensional field can be reconstructed by a computer-generated hologram. The error of reconstruction in the z-directions is evaluated by traverse of particles on a glass plate. A velocity error in z-direction is obtained by uncertainty analysis. The time evolution of a three-dimensional water flow in a semicircular micro-channel of 101.9[μm] width and 32.5[μm] depth and in a circular micro-pipe of 92[μm] inner diameter are obtained successfully using this micro-DHPTV system. The volume of the system is defined by 409.6[μm]×92[μm]×92[μm], and is irradiated by a laser beam with a resolution time of 100[μs], and a repetition rate of 1[kHz]. Consequently, approximately 100 instantaneous velocity vectors on each 1000 frames for 1[s] in the micro-channel can be obtained.
