Journal of Electrical Engineering and Automation

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.

PLC; Strain measurement; Strain gauge