High-Temperature Strain Gauge Measurement Techniques for Temperatures Above 800 °C: A Review

Pre-study tests and strain measurements of critical structural components in high-temperature environments are paramount. In the field of high-temperature strain measurement, the contact strain measurement method has the widest application range, a high measurement accuracy, and a low cost. At present, a variety of high-temperature strain gauges have been developed at home and abroad. However, due to material and processing process limitations, the research on high-temperature strain gauges applied above 800 °C is still relatively small and immature. Therefore, it is very necessary to do a systematic analysis of the research in this field. This paper describes the basic principle and structure of high-temperature strain gauges and systematically analyses and summarizes the current research status of high-temperature strain gauges' sensitive grids, protective layers, and transition layers in terms of materials and structures. Finally, based on the existing research, it provides ideas and prospects for future contact strain measurement methods applied to higher temperatures.