The Open Electrical & Electronic Engineering Journal

2014, 8 : 361-366
Published online 2014 December 31. DOI: 10.2174/1874129001408010361
Publisher ID: TOEEJ-8-361

The Method of Design Sine Grating Based on Optimal PWM

Qiao Fu
College of Computer Science and Technology Harbin Engineering University, Harbin, 150001, China.

ABSTRACT

In the structured light 3d optical measurement field, the sinusoidal grating design is one of the research focus. The traditional focus methods of generating sine pattern can’t be widely accepted because of many well known defects. While the another traditional binary pattern generated from Ronchi grating which need defocusing processing, its application has also been a certain limit because of its projected pattern contrast ratio is not high.In this paper, we have proposed a designing sine grating method with the spatial modulation theory based on Optimal PWM in electronic engineering. Compared with Ronchi grating, this method of generating pattern have better fringe contrast, and more simple defocusing requirements, so this method have good practical economic value.

Keywords:

3d profile measurement, Sine grating, PWM, The Fourier transform.