The Principle And Manufacture Of Micro Visual Optical Tag By Passive Light Source

Traditional optical tag is widely used because of its low cost and easy to make. However,in some professional areas,optical tag is required to made mirco.According to the principle of defocus blur ,ordinary camera can detect extremely small objects in a far distance. It means that traditional optical tag could advance to the micro.Through contrast varirty of common optical tag, the QR code is more suitable to be micro.In our experiment, the size of micro optical tag which we used is 0.87mm×0.87mm.The transmitter of micro visual optical tag by passive light source includes reflective membrane,mirco optical tag and a simple len.The receiver is used by cell phone camera.Through simulation and experiment,we add Galileo telescope system in front of cell phone lens to increase the detection distance,then add LED and transflective semi-reflecting membrane as auxiliary light source,as to cell phone camera can detect the micro 2D barcode in a far distance and decode correctly.This article shows parameters of the optical system needed in this design and calculate the parameters of the whole system for reference using actual performance figure. The primary content and features of the dissertation includes:(1)This paper researchs and analysis on the theory of optical tag system.It shows the program that we can use micro optical tag by passive light source as transmitter and use cell phone camera as receiver.(2)We produce the transmitter of micro visual optical tag by passive light source,and do experiment by aluminized membrane and fluorescent membrane.(3)Based on the theory and ZEMAX software, we desiged the cell phone camera auxiliary receiver module,provided the auxiliary light source of micro visual optical tag system by passive light source,and overcome the weak point that cell phone camera detected short .Then cell phone camera's detective distance increased to 15cm and even more.