Model and Visualization of Ray Tracing using JavaScript and HTML5 for TIR Measurement System Equipped with Equilateral Right Angle Prism

Abstract

Trace of ray deviated by a prism, which is common in a TIR (total internal reflection) measurement system, is sometimes difficult to manage, especially if the prism is an equilateral right angle prism (ERAP). The point where the ray is reflected inside the right-angle prism is also changed as the angle of incident ray changed. In an ATR (attenuated total reflectance) measurement system, range of this point determines size of sample. Using JavaScript and HTML5 model and visualization of ray tracing deviated by an ERAP is perform and reported in this work. Some data are obtained from this visualization and an empirical relations between angle of incident ray source \theta_S, angle of ray detector hand \theta_D, and angle of ray detector \theta'_D are presented for radial position of ray source R_S, radial position of ray detector R_D, height of right-angle prism t, and refractive index of the prism n. Keywords: deviation angle, equilateral right angle prism, total internal reflection, JavaScript, HTML5.