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Research on Intelligent Dual-frequency Metal Detector

Author: SunLiBing
Tutor: WangQingNian
School: Nanchang University
Course: Motor and electrical
Keywords: Metal Detector Phase-sensitive detection TMS320LF2407 RS-485 DDS
CLC: TP21
Type: Master's thesis
Year: 2008
Downloads: 193
Quote: 2
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Abstract


With the rapid development of microelectronics and computer technology, the traditional metal detection system is a quick update and development in the new direction. The metal detector is primarily used in the mining the probe and military mine detection, and is now widely used in travel security as well as food, textiles, wood, toys, medicines and other production and processing industry, quality and safety testing. In the context of the times continue to highlight the role of science and technology progress and metal detectors in the social life, how to enhance and improve the performance of the metal detector instrument has become an urgent subject in the field. The purpose of this project is to design a dual frequency digital metal detection system, ferromagnetic and non-ferromagnetic metal can be detected with high accuracy, completely change the operating mode of the ordinary metal detectors detect types of single and accuracy not the status quo. The detection system uses a multi-channel synchronous digital frequency synthesis (DDS) technology produces a sinusoidal signal source, through the eddy current sensor to detect a metallic foreign body. TMS320LF2407 as the data processing center, the use of self-learning algorithm to automatically adjust system parameters, and the design of man-machine dialogue interface, to improve the metal detector readability and operability. From the theoretical analysis of the metal detector and specifically addressed two aspects of the design of the dual-band metal detectors. The theoretical analysis discussed from the perspective of the electromagnetic field amplitude and phase characteristics of the metal material, and draw correlation conclusion that the presence of the detection sensitivity of the detection frequency with different metals. In system design is divided into three parts: the detection system works and overall structure of the system hardware design, system software design. The first part described the whole system works as well as implementations; hardware design starting from the detection circuit and control circuit, and detailed description of the transmitter, receiver, demodulation circuit as well as the design process of the eddy current sensor, and highlights DSP, microcontroller and other major chip interface circuit design, software design part of the main program flow the DSP system and human-computer dialogue system in CCS, u-Visin integrated environment based on the RS-485 SCI serial communication hardware circuit design; and a description of the system implementation process, and finally self-learning method analyzes SCI serial communication software. The paper finally finishing the experimental results of the testing of the system. The experimental analysis shows that, using dual-frequency metal detector has a higher detection accuracy of ferromagnetic and non-ferromagnetic metal. Better readability and operability of the entire system, and easy to extend the upgrade, cost-effective, and has a good prospect.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts
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