Rapid in-situ 3D measurement of shiny object based on fast and high dynamic range digital fringe projector

•A fast and high dynamic range digital fringe projection technique is proposed.•The modified projector can reach a maximum frame rate of 700 Hz.•The projector's light intensity can vary 27 times for three LED chips.•Projector can help obtain fast and effective 3D measurement of light alloy surface.

A fast and high dynamic range digital fringe projection technique is proposed to achieve fast and effective 3D measurement of shiny workpieces with dense point clouds. The new projector can reach a maximum frame rate of 700 Hz. The dynamic range of the light intensity can vary at least 9 times by using multiple homochromous LED chips and intensity modulation technique. The results of our experiments showed that the projector can reduce 88% of the routine projecting time, and it improves the speed of 3D precise measurement of shiny surface.