The Nuremberg International Invention Exhibition (IENA) is the first invention exhibition and a well-known one with great reputation in the world. The invention exhibition always attracts companies, traders and so forth. They visit it and make purchases there. The 2014 Nuremberg International Invention Exhibition took place from October 30^th to November 1^st in the year of 2014. At this event, the YunTech team won 1 silver and 2 copper medals.

The silver medal invention, “Water Screen 3D Projecting System,” was invented by students Lin Kai-hung and Dai Yu-wen under the instruction of Professor Chen Chien-yue from the Department of Electronic Engineering. The invention is equipped with one projector on the right and left side respectively, providing broader images for viewers and projecting mist images created by water mist sprayers. The mist images with penetration make the images become 3D images, making viewers believe they are one part of the images. The most important part is that the resolution can be decided by diameters of water drops, creating shocking images other normal projectors cannot accomplish.  

The first copper medal invention, “The Phase Shifting Shadow Moire’ Interferometry by Grating Modulation,” was invented by student Huang Kuo-lung under the instruction of Associate Professor Cheng His-chao from the Department of Electronic Engineering. The invention is an optical inspection system of a shadow moire interferometer with phase-shifting. The invention has four features. First, the inspection system inspects optically, a non-contact test method, which won’t break the surface of devices and which has a higher accuracy rate. Second, the interferometer allows for a phase reconstruction method which reconstructs the surface of devices and which therefore serves as a 3D scanner. Third, the inspection system adopts LabVIEW to produce a man-machine interface. Capturing interference patterns, phase shifting optical gratings and reconstructing 3D surfaces can be a one-stop process, making the inspection quicker and more efficient. According to the Stoney method, the residual stresses of thin films can be extracted with the curvature radius of deformed devices, thus helping to solve the residual stress problem happening in the soft coating film industry.