YCa4O(BO3)3 based acceleration sensor for 850 ℃ ultra high temperature application

With the continuous advancement of industrial technologies, the demand for accelerometers capable of operating under extreme conditions is growing. Piezoelectric accelerometers have attracted widespread attention due to their advantages, including a broad measurement dynamic range, wide usable frequency range, rapid response, ease of installation, and excellent high-temperature stability. This study focuses on the high-temperature performance of piezoelectric accelerometers. Through experimental measurements and theoretical calculations of the YCa4O(BO3)3 (YCOB) single crystal and finite element analysis of the sensor, a shear-mode piezoelectric accelerometer was designed and fabricated based on YCOB crystal with excellent temperature stability. The device operates in the range of 50-4000 Hz and achieves ultra-stable amplitude linearity (<1%) in the vibration range of 0.5-200 g. Crucially, its temperature-insensitive charge sensitivity (7.67 pC/g, ±10% fluctuation from room temperature to 850 ℃) redefines the stability benchmarks for high-temperature piezoelectric accelerometers. This accelerometer demonstrates exceptional performance, outperforming most commercial high-temperature sensors, and provides a new pathway for the high-temperature applications of piezoelectric accelerometers.