5.1 Sapphire Material Characteristic5.2 Sapphire Fiber Fabry–Perot High‐Temperature Sensor Design and Fabrication5.3 Sapphire Fiber Fabry–Perot High‐Temperature Sensing Demodulation System5.4 Analysis of Sensing Performance of Sapphire Fiber Fabry–Perot High‐Temperature Sensor5.5 Self‐Filtering High Fringe Contrast Sapphire Fiber Fabry–Perot High‐Temperature Sensor5.6 SummaryReferences