【作者】 刘世海；

【导师】 董泽华；

【作者基本信息】 华中科技大学 ， 控制工程， 2014， 硕士

【摘要】 近年来，太阳能作为一种可替代的清洁能源日益受到社会的广泛关注，随之而来的是光伏发电、太阳能电池的研究热潮。目前发展最快的是动态光谱调制阻抗谱扫描测试方法IMPS(Intensity Modulated Photocurrent)/IMVS (Photovoltage Spectroscopy)，它实现了动态调制光谱强度的同时完成阻抗测量及阻抗谱的绘制。在电化学应用领域，传统的频谱扫描是由电化学工作站完成，由于电化学工作站针对常规电化学实验方法设计，无法实现动态调制光电光谱的功能，亦无法实现两者精准的同步控制。在硬件设计方面，传统电化学工作站基于单片机设计，使用逻辑器件来实现其功能扩展，进而实现DDS输出及信号采集、存储控制等功能。但随着电化学研究的不断深入，对实验设备的响应速度、测量精度提出越来越高的要求，硬件结构及软件设计也越来越复杂，传统设计方案已经无法满足不断更新的实验要求。该论文以光谱电化学测量为基础，基于ARM平台及高速高精度模数混合电路提出了一套强度调制的光电化学扫描频谱仪的设计方案，并完成了设计方案的硬件设计及测试工作。该设计方案包括以下内容：基于AD7671的双通道数据采集器、基于FPGA设计的任意信号发生器（DDS）、高精度恒电位仪、高精度恒电流仪、频率响应分析仪（FRA）、iR降补偿电路、多级信号放大、多段可选巴特沃斯低通滤波器以及USB、TCP/IP隔离通信。最后，配合光强调制设备完成了标准体系的阻抗谱扫描测试，测试结果：DDS正弦输出频率范围10uHz-1MHz，频率控制精度0.01%以内；阻抗测试范围在10-3-1011，技术指标达到设计要求。更多还原

【Abstract】 In recent years, the solar power as an alternative clean energy is growinglywidespread concern in society，Followed by photovoltaic, solar cells research boom.Currently，the method widely used by the scientific field is static/dynamic test methods, andthe dynamic photo modulation spectroscopy IMPS/IMVS is so far the latest and most rapiddevelopment voltage/current testing technology. In the field of electrochemical energy-research, the traditional spectrum scanning is completed by electrochemical-workstation.Due to the electrochemical-workstation designed for conventional electrochemicalexperiment, it is unable to realize dynamic modulation function of photoelectric spectrum,and is unable to realize the accurate synchronization operation. The traditionalelectrochemical workstation is designed based on simple MCU controller；Logic devicesare used to achieve its extended function, and then realize the DDS output, data collectionand storage operation. Nevertheness, with the deepening of the electrochemical studies theresponse speed of testing equipment and the measurement precision made increasingdemands, and then the structure of the logic system is becoming more and morecomplicated, the traditional design scheme has been hard to meet the demand.In this paper, the spectral electrochemical measurement as a starting point, and a set ofintensity-modulated photoelectrochemical scanning spectrometer design based on ARMplatforms and high-speed high-precision analog-digital hybrid circuit design and carry outthe verification of the principle. Main program includes: Arbitrary Wave Generator (AWG)Based on ARM and FPGA platforms, dual-channel data acquisition based on the AD7671,high-precision potentiostat, high-precision galvanostat, FRA, iR drop compensationcircuit,multi-level amplification, multi-segment optional Butterworth LPF and isolatedUSB,TCP/IP communication module.Finally, complete the impedance spectrum scanning test by using the spectroscopyequipment with the photo intensity modulation, test results: the Sine frequency from DDSranged in the10uHz to1MHz,and frequency control precision is within0.01%; Impedancetest ranged in the10-3-1011.更多还原