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Research on Hand-held Rid’s Acqusition System Design

Author: MaFei
Tutor: WeiYiXiang
School: Tsinghua University
Course: Nuclear Science and Technology
Keywords: Peak Hold Pile up Rejection Embedded System Monitoring System Hand-held radionuclide identification device (RID)
CLC: TL81
Type: Master's thesis
Year: 2009
Downloads: 133
Quote: 2
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Abstract


Hand-held Radioisotope Identification Device(RID) is a multi-functional portable nuclear monitoring equipment based on multi-channel spectrometer that can be used for dose rate monitoring, radioactive sources location, nuclear spectrum data acquisition and radioisotope identification. This paper presents a improved design for domestic digital hand-held RID that has been successfully developed by our team. This article attempts to use analog multi-channel acquisition circuit to further reduce system power consumption and equipment size, and implements spectrum data monitoring and transmission, to complete a spectrum data acquisition system.The paper discussed the above design work.This paper first introduces the basic principles of multi-channel spectrometer, summarizes research status and development trend of multi-channel spectrometer products and technology at home and abroad, discusses the whole design scheme of the acquisition system including acquisition circuit and monitoring software platform. The system is made up of spectrometry data acquisition circuit and monitoring software. The system adopts structure of "signal conditioning circuit +ADC+CPLD".The signal conditioning circuit includes function modules such as pole-zero cancellation circuit, base line restorer, pile up rejection circuit, peak holder and so on, and realizes digital logic control with CPLD and data transmission with USB interface. The hardware platform of monitoring system is structured on the basis of embedded system based on ARM9 processor, and the software part based on Windows CE.NET operating system. The monitoring software is developed with eMbedded Visual C++ IDE.This article mainly analyzes functional modules of the system and gives optimization design, introduces the principle of CPLD and realization of complex logical function, describes USB development process and the development method of firmware. It also presents device drivers model and development process in Windows Environment, and introduces the development method of USB driver and button driver in external interrupt mode. The system accomplishes the debugging of the software and hardware. Based on touching screen operation, the system completes acquisition circuit control, and can realize such functions as spectrum data display, storage and preprocessing.At the last part, it summarizes the system development and debugging results, tests acquisition board and displays actual measurement spectrum data. According to the actual development demand, this paper puts forward further improvement suggestion and analysis the existent insufficiency and scalability of the system.

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CLC: > Industrial Technology > Nuclear technology > Particle detection,radiation detection and nuclear instrumentation > Radiation detection technology and instrumentation
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