Design of resistance strain gauge based on PLC control
基于PLC控制的电阻应变仪设计

摘要

在现代工业生产以及各类工程研究中，准确、实时的检测材料以及结构的应变情况，对于保证产品质量、确认结构是否安全和推动各项相关技术创新都具有十分关键作用。本文深入研究了基于PLC的电阻应变仪，该仪器在工业自动化监测与力学性能检测中有着十分重要的地位。基于PLC的电阻应变仪的工作原理是电阻应变片的数据由PLC进行读取与处理。电阻应变片原理是材料的压阻效应。当粘贴物体表面或结构受力发生形状变化时应变片随之形变，应变片电阻值改变。在通过1/4惠斯通电桥将电阻变化转化为电压信号输出。PLC作为仪器的核心处理元件，利用其强大的数据处理能力、良好的靠性以及稳定的控制性能来对电桥电压信号进行采集以及运算。

Abstract

In modern industrial production and various engineering research fields, accurate and real-time detection of strain in materials and structures plays a crucial role in ensuring product quality, confirming structural safety, and promoting relevant technological innovations. This paper delves into the study of a resistance strain gauge based on Programmable Logic Controller (PLC), which holds significant importance in industrial automation monitoring and mechanical property testing. The operating principle of the PLC-based resistance strain gauge involves the reading and processing of data from resistance strain gauges by the PLC. The principle of resistance strain gauges is based on the piezoresistive effect of materials. When an object to which the strain gauge is adhered undergoes shape changes due to applied force, the strain gauge deforms accordingly, leading to a change in its resistance value. This resistance change is then converted into a voltage signal output through a quarter-Wheatstone bridge circuit. As the core processing element of the instrument, the PLC utilizes its powerful data processing capabilities, good reliability, and stable control performance to collect and compute the bridge voltage signals.