High-speed shape measurement with 4 kHz using linear LED device

Abstract

High-speed shape measurement is required to analysis the behavior of a breaking object, a vibrating object or a rotating object. A shape measurement by a phase shifting method can measure the shape with high spatial resolution because the coordinates can be obtained pixel by pixel. A light source stepping method (LSSM) using linear LED array was proposed by authors. Accurate shape measurement can be performed by a whole space tabulation method (WSTM). The response speed of the LED array is more than 12 kHz. In this paper, high-speed shape measurement is performed with a high-speed camera by WSTM and LSSM using a linear LED array. The phase shifting is performed in 12,000 Hz and the shape measurement of a rotating fan is performed in 4,000 Hz. © The Society for Experimental Mechanics, Inc. 2014.