射频辐照细胞实验系统研制

发布时间：2018-11-22 11:11

【摘要】：本文旨在研究900MHz和1800MHz电磁辐照细胞实验系统的研制。本系统以单片机控制信号源和功放模块，实现了连续波和脉冲调制波两种标准的实验辐照波形；以标准尺寸的900MHz和1800MHz矩形波导作为辐照箱，通过反相双源激励方式建立均匀的驻波场分布；设计功率检测模块精准测量激励源的反射功率，根据入射功率和反射功率之差得到细胞的吸收功率，，作为剂量分析的基础；本实验系统通过加温模块和测温模块，辅以内置空气循环系统，为培养细胞在电磁辐照下产生生物效应的实验研究提供稳定可控的电磁辐照方式和温度等环境。本文首先从预期功能出发设计电路，将系统分为8个模块：主控模块、射频模块、功率检测模块、温度检测模块、风扇调节模块、加热控制模块、二氧化碳和湿度检测模块以及LCD显示模块。分析设计的合理性与可行性之后，利用Protel和Cadence等工具制作电路原理图，组成硬件架构。结合硬件电路，在Keil平台下，进行单片机软件仿真和调试。利用8位控制总线和8位数据总线设计了一种8位PPI通信协议，用于实现模块间数据的双向传输。基于传输稳定性和时效性，本文对比分析了两种实施方案的优劣。在温度调节系统中引入PID算法，克服加热炉的升温惯性，实现温度调节的快速稳定。通过实验测量，绘图并分析实验数据，对系统各模块的参数进行了校正。
[Abstract]:The purpose of this paper is to study the development of 900MHz and 1800MHz electromagnetic irradiation cell experiment system. In this system, the signal source and power amplifier module are controlled by single chip microcomputer, and two kinds of experimental irradiation waveforms are realized, which are continuous wave and pulse modulation wave. 900MHz and 1800MHz rectangular waveguides of standard size are used as irradiation boxes to establish uniform standing wave field distribution by means of inverse dual source excitation. The power measurement module is designed to accurately measure the reflected power of the excitation source, and the absorption power of the cell is obtained according to the difference between the incident power and the reflected power, which is the basis of dose analysis. The experimental system provides a stable and controllable electromagnetic radiation mode and temperature environment for the experimental study of biological effects of the cultured cells under electromagnetic irradiation by means of heating module and temperature measurement module and with the help of built-in air circulation system. The system is divided into eight modules: main control module, radio frequency module, power detection module, temperature detection module, fan regulation module, heating control module. Carbon dioxide and humidity detection module and LCD display module. After analyzing the rationality and feasibility of the design, the schematic diagram of the circuit is made by using Protel and Cadence tools, and the hardware structure is formed. Combined with the hardware circuit, under the Keil platform, the software simulation and debugging of single-chip computer are carried out. An 8-bit PPI communication protocol is designed by using 8-bit control bus and 8-bit data bus, which is used to realize the two-way transmission of data between modules. Based on the transmission stability and timeliness, this paper compares and analyzes the advantages and disadvantages of the two implementation schemes. The PID algorithm is introduced into the temperature regulation system to overcome the inertia of heating and to realize the fast and stable temperature regulation. Through experimental measurement, drawing and analysis of experimental data, the parameters of each module of the system are corrected.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：R318.6

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