Text Box: Moiré Interferometry shows the deformation caused by partial drying of a human tooth section.  The contour interval is 0.417 µm/fringe (courtesy of Measurements Group)

Text Box:        Experimental Stress Analysis - Optical Method in Mechanical Measurement             MicTech Lab Contact Instructor: Wei-Chih Wang, Ph.D.                                                 Office: ME113 Grading: 3 credits Class Time: MWF 9:30-12:20 AM          Objectives The main goal of this course is to introduce engineers to the characteristics of light that can be used to accomplish a variety of engineering tasks especially in mechanical analysis. At the end of the course, students should be familiar with the range of possible applications for optics in mechanical measurement, and have a sense of how to evaluate the potential of optical methods vs. non-optical methods for any task.   The course involves lectures and laboratory work. The course is focused on the study of actual mechanical behavior of engineering materials through optical experimental methods. The theoretical background and technique for testing are extensively discussed. The lab work involves several major projects as well as various testing demonstrations. Most of the projects involve analysis, instrumentation, theoretical prediction, etc.     Topics Review of Geometric Optics and Electromagnetic wave Theory Introduction to Light sources and photodetectors Geometric Moiré: In-plane displacement measurement Geometric Moiré: out of plane displacement measurement Moiré Interferometry: Interference and Diffraction, Grating fabrication Moiré Interferometry: Holographic and Laser Speckle Interferometry Photoelasticity: theory and techniques Introduction to fiber optic and waveguide delivery and detection   Audiences This course is for persons interested in experimental mechanics, physics, stress analysis, deformation analysis, motion measurement, engineering design, structural testing, metrology, nondestructive inspection, and similar fields.   This course mainly serves students in mechanics, and civil, mechanical, and materials engineering. This course should also be of interest to those interested in validation of numerical models.   "Experimental evidence is the truth theory must mimic."       Textbooks and References · Optical Methods of Engineering Analysis, Gary Cloud, Cambridge University Press. · Handbook on Experimental Mechanics, Albert S. Kobayashi, society of  experimental mechanics. · Applied Electromagnetism, Liang Chi Shen, Weber&Schmidt Dubury · Fundamentals of Photonics, B. Saleh, John Wiley& Sons. · Optoelectronics and Photonics: Principles and Practices, S. O. Kasap, Prentice Hall.     · Fiber optic Sensors, E. Udd, John Wiley& Sons      · Selected papers in optical sensors, optical MEMS devices and integrated Optical devices.     Course Prerequisite(s) ·           Physics 123 or permission of instructor. ·           ME 354 (Mechanics of materials) or equivalent.   Lecture Notes and Assignmements Week 2  Ray-Optics Approach (Snell's law, Geometric optics, thin lens, matrix method) and  Week 3  Electromagnetic-Wave Approach (wave equation, polarization, diffraction, interference, grating) Week 3  Light sources  and  photodetectors Week 4  Geometric Moiré: In-plane displacement measurement  Week 5  Geometric Moiré: out of plane displacement measurement Week 6  Moire Interferometry: Interference and Diffraction, Grating fabrication Week 7  Moiré Interferometry: Holographic and Laser Speckle Interferometry Week 8  Photoelasticity Week 9  Photoelasticity Week 10  Fiberoptic and polymer waveguide sensors       Homework Homework #1 Homework#2 Homework#3 Homework #4 Final project Lab lab 1 Refraction and Diffraction Experiment Lab2 Geometric Moiré Experiment Line and grid patterns: Download grating1 (period: 0.03 inch) Download grating2 (period: 0.031 inch) Download grating3 (period: 0.0311194968 inch) Download grid1 (period: 0.03 inch) Download grid2 (period: 0.031 inch) Lab 3 Moiré Interferometry Experiment Lab 3 Grating Sample Preparation Procedure Lab 4 Shadow Moiré Experiment