Application of optical pickup head for signal detection in microchannel on a rotating compact disc

• Main Authors: Kun-Yu Liu, 劉昆育
• Other Authors: 陳志敏
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/57067366226983394527

碩士 === 國立中興大學 === 機械工程學系所 === 96 === This thesis mainly applies the DVD optical pickup head to examine the geometry of the channels undergoing rotation. From the radio frequency signal, the width of channel can be measured and the filling of liquid in the channel can also be determined. The channel disc was constructed in a PC substrate of 12 cm in diameter using a CNC machine. There are two types of dimensions used in the experiments. One is between 400 and 600 and the other is 5 with polishing surface. It is found that the radio frequency signal shows a rising sequence of H-like shape as the channel is detected with filling of liquid. The signal shows in low state of U-like shape as the channel is empty without any liquid.