Rational composition design of sesquioxide (Y,Sc,Lu) 2 O 3 single-crystal fibers for robust and high-sensitivity ultrasonic temperature sensing beyond 2100 °C

This work demonstrates a novel (Y,Sc,Lu) 2 O 3 single-crystal fiber ultrasonic temperature sensor for extreme environments. It achieves ultra-high temperature sensing up to 2100 °C, setting a new record for contact-type fiber temperature sensors.