Real-time monitoring of temperature changes in substation equipment is crucial for preventing failures and ensuring a stable power supply.Currently,temperature monitoring of substation equipment primarily relies on manual infrared thermometry,which has limitations such as strong operational dependence,susceptibility to interference,and difficulty in detecting internal faults.The luminous intensity ratio(LIR)is a stable optical parameter unaffected by factors such as spectral loss and environmental influences,making it suitable for temperature detection.The multi-emission characteristics of rare-earth-doped upconversion(UC)materials are highly compatible with LIR technology,demonstrating their potential in high-precision temperature monitoring.Here we introduces a non-contact temperature monitoring method for substation equipment based on NaErF4@NaYF4 core-shell UC materials and LIR technique.Experiments show that the method has high accuracy and sensitivity within temperature range of 25 ℃ to 225 ℃,with a sensitivity as high as 35 × 10-3℃-1,effectively monitoring temperature changes both inside and outside the equipment.This provides a new technical solution for temperature monitoring of substation equipment.
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