【作者】 黄庆探；

【导师】 付红桥；

【作者基本信息】 重庆大学 ， 仪器科学与技术， 2010， 硕士

【摘要】 “民以食为天,食以安为先”,食品安全关乎人们健康和国计民生。因此,食品安全越来越引起全社会的关注。目前,针对食品安全监测的仪器大部分采用光谱分析仪器。传统光谱分析仪器大多只能进行少样本定点抽查检验或者实验室使用,而且费用昂贵,普及率低,造成了我国食品安全监测力度弱的现状。因此,开发一款价格低廉、监测速度快、体积小、重量轻、使用方便的光谱监测仪具有重要的意义。正是在上述背景下,重庆大学提出并研发了具有自主知识产权的光栅平动式光调制器(Grating Moving Light Modulator,GMLM),采用GMLM作为光谱编码的核心器件,开发一款具有价格低廉,信噪比高,体积小,检测速度快等优点的近红外光谱监测仪。本文介绍了GMLM的结构与工作原理,分析了GMLM的机电特性,设计了器件驱动电路,并在此基础上进行了线阵GMLM器件测试及其驱动控制系统的相关实验研究。本文主要研究工作如下:①分析线阵光栅光调制器的结构与工作原理,对线阵GMLM的工作电压、吸合电压、固有频率等机电特性进行研究,为线阵GMLM驱动控制电路的设计提供理论依据;②根据线阵光栅光调制器的结构与工作原理,针对GMLM的机电特性,设计线阵GMLM的驱动控制电路,研究哈达玛变换原理,推导相应的S-矩阵,分析以线阵GMLM为模板实现S矩阵以达到光谱调制的方案和原理;③采用Altera公司的FPGA(Cyclone系列的EP1C6Q240C8),及其相应的开发软件QuartusII 6.0和Verilog硬件描述语言实现S-矩阵及其他控制信号,完成Hadamard时序控制电路的设计;应用Protel DXP软件设计PCB,选择合适的数模转换器(TLC5615)、运算放大器(OPA551)、多路模拟开关的元器件(ADG221),得到0-25V、30阶可编程电压,完成线阵GMLM的驱动电路的设计;④结合光学系统,搭建MEMS线阵光栅光调制器控制系统电路的相应软、硬件测试与实验系统平台,测试驱动控制电路的性能和线阵光栅光调制器的机电特性。更多还原

【Abstract】 "Hunger breeds discontent, to food security for the first", food safety is close to people’s health and national welfare and the people’s livelihood. Therefore, food safety has caused the concern of the whole society. Currently, most of instruments for monitoring food safety are spectral instruments. Most of traditional spectral instruments can only test a small sample of fixed-point sampling or be used in the laboratory, moreover, these instruments are expensive and low penetration, which resulted in the weak actuality of food safety monitoring. Therefore, it is significant to develop a novel spectroscopy,which has the advantages of low-cost, rapid monitoring, small size, light weight, easy to use.Under this background and urgent needs, GMLM (Grating Moving Light Modulator) project with independent intellectual property rights was just prompted by Chongqing University. GMLM serving as the core device of spectral encoding, a novel near-infrared spectroscopy with the advantages of low price, high signal to noise ratio, small size, fast detection, is under development. In this paper, the structure and working principle of GMLM were described, and electrical and mechanical characteristics of GMLM were analyzed. Then the driving circuits of GMLM were designed and developed, furthermore, the research and relevant experiment for the control system of GMLM array were accomplished.The main work of this paper is as following:①The structure and working principle of GMLM were analyzed. Electromechanical parameters such as operation voltage, pull-in voltage and resonance frequency of GMLM were researched. That provided the theory for the design of drive control circuit of GMLM.②According to the structure, working principle and electromechanical characteristics of GMLM, the driving control circuit of linear GMLM array was designed. Based on Hadamard transform theory, the corresponding S matrixes were derived. The principle of as GMLM a template for implementing S matrix to modulate spectrum was analysised.③The S-matrix and other control signals were designed and the timing control circuit of GMLM was completed by FPGA. Using Protel DXP software, selecting the appropriate DAC(TLC5615), op amp(OPA551), multi-channel analog switch components(ADG221), the programmable voltage (0-25v ,30 rank) was achieved, and then the drivie control circuit of GMLM was completed.④The test platform of drive control circuit of GMLM corresponding software and hardware was established with the optical system. The drive control circuit of GMLM and characteristics of GMLM were tested respectively.更多还原