Optimization Design of Sensor Used in Judicial System

• Main Authors: Ming-Tsai Shih, 施明材
• Other Authors: I-Fong Chen
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/k7wfqa

碩士 === 景文科技大學 === 電子工程系電腦與通訊碩士班 === 105 === This study is to present the effect of wireless communication antenna disguised in detecting cars’ plate and to resolve the exposure problem for domestic investigation unit while acting in evidence search. Furthermore, it is necessary to look after the optimization of the sensor to make sure the fluency of the communication command action. The experimental setting in this study is applying the frequency of 170MHz in VHF band. The detecting cars in this test are used in actual investigation, and the test is run car to car. The results are shown as the following. First of all, under the premise that the license plate cannot be changed, the sensor is tuned to suitable frequency by using L-type matching circuit. Secondly, due to the low position of license plate in general cars, the signal receiving performance of the sensor might be reduced to 6.5％. However, the performance of the emission signal could be promoted slightly by using sensor matching technology. Next, the optimization of lightweight could be achieved by using the original license plate as the metal to send to and to receive radio waves. The fourth, using the license plate for sensor disguise makes no change in appearance, and this reaches the perfect conceal result. The last, the license plate has only one size and one specification regulated by the Directorate General of Highways, MOTC, and applies to all car models for all brands. This will satisfy the need for diversification in detecting cars. The idea in this study ensures the detecting cars in smooth operation. Moreover, the disguise design of the license plate still meets the regulation of original standard specification which is beneficial to the investigation operation.