Thermal pattern generation for infrared deflectometry

摘要

Operating in the visible spectrum, the method of deflectometry provides reliable surface-slope measurements. We present the extension of the method to the thermal infrared (IR) spectrum, thus enabling the deflectometric inspection of rough surfaces and objects made of transparent and non-specular materials. Since affordable technologies to create code patterns in the thermal IR do not exist, we propose a novel method to produce large-scale dynamic thermal patterns with the help of a powerful laser. In addition, we adapted coded pattern techniques to our setup and present the results of deflectometric measurements.