Phase shifting photoelasticity in white light
- 作者：Augusto Ajovalasit ; Giovanni Petrucci ; Michele Scafidi
- 关键词：Experimental mechanics ; Digital photoelasticity ; Phase shifting ; RGB method
- 刊名：Optics and Lasers in Engineering
- 出版年：2007
- 期刊代码：98_01438166
- 类别：cp
- 出版时间：May 2007
- 卷：45
- 期：5
- 页码：596-611
- 文件大小：491 K
摘要
The availability of image acquisition systems has led to the development of digital photoelasticity both in monochromatic and white light. In particular white light has been used mainly with the following methods: Spectral Content Analysis, RGB photoelasticity and phase shifting photoelasticity. Phase shifting photoelasticity in the colour domain has been used effectively for the determination of the isoclinic parameter in order to reduce the influence of the isochromatic fringes. The method has been also proposed for the determination of the isochromatic fringe order. This paper concerns the general characteristics of phase shifting photoelasticity in the colour domain. Special attention is drawn towards the influence of spectral content of the light source, the spectral response of the colour camera filters, the dispersion of the birefringence and the error of quarter wave plates.