热膨胀式电流计的设计与可行性分析

DESIGN AND FEASIBILITY ANALYSIS OF THERMAL EXPANSION GALVANOMETER

本文设计了一款应用电流热效应测量电流大小的仪器:热膨胀式电流计。该电流计主要由电流反馈部分、放大部分、环境控制部分组成。依靠电流热效应与金属热胀冷缩,将电信号转化为位移信号;随后通过光杠杆法对微小变形进行放大,以提高测量精度并控制误差;通过控制环境变量的方法,减小测量影响因素,提高电流计的适用范围。该电流计在测量大电流方面具有显著优势,并且对于电流过载具有较强的耐受能力,在电流监测方面拥有广泛应用空间。

In this paper,an instrument for measuring the current by using the thermal effect of current is designed:thermal expansion current agent.The current agent is mainly composed of current feedback part,amplification part and environment control part.Depending on the current thermal effect and metal thermal expansion and contraction,the electrical signal is transformed into displacement signal;then the micro deformation is amplified by the optical lever method to improve the measurement accuracy and control the error;by controlling the environmental variables,the influence factors of measurement are reduced and the application scope of the current agent is improved.The current agent has a significant advantage in the measurement of large current,and has a strong ability to withstand current overload,so it has a wide application space in current monitoring.