The Incident Angle Determination Based on Infrared Polarization

A new method to determine the incident angle in the shape detection of transparent objects was given in this paper. This method was based on the polarization degree of infrared light .In the visible domain,the polarization degree is a secondorder function of incident angle.There was an angle on each side of the Brewster's angle,so the incident angle can not be uniquely determined. In the infrared light domain,the polarization degree and the incidence angle are in the one-one correspondence.You can make a distinction between the two angles in the visible domain and get the correct incident angle. This method improves the accuracy of detection for shapes of transparent objects and can be used to detect objects with complex shape.