一、前言以锁定放大器为代表仪器的锁定检测技术是一种微弱信号检测技术,它已在交流阻抗测定、交流极谱、腐蚀研究、半导体电化学和光电化学等电化学研究中获得广泛的应用. 由于较大幅度的激励信号(包括电、光、磁、声等)会引起电化学实验体系的不可逆变化,而且一般的电化学过程总是非线性的,利用小幅度的激励信号不仅可以避免体系不可逆变化的发生,而且可以使体系的非线性度减到最小.因此,采用弱激励信号可以简化实验 I. INTRODUCTION The lock detection technology represented by the lock-in amplifier is a weak signal detection technology which has been widely used in electrochemical impedance spectroscopy, AC polarography, corrosion studies, electrochemical studies of semiconductors and photoelectrochemistry Since the larger excitation signal (including electricity, light, magnetism, sound, etc.) Can cause the irreversible change of electrochemical experiment system, and the general electrochemical process is always non - linear, using small excitation signal can not only avoid the system Irreversible changes occur, and can make the system to minimize nonlinearity.Therefore, the use of weak excitation signal can simplify the experiment