A temperature sensing measurement scheme based on fiber-coupled light-
powered conversion probe is proposed. The sensing probe is powered by a 20 mW
semiconductor laser with stable fiber transmission, which improves the coupling
efficiency of the light source and the fiber. The optical drive and detection signals
are isolated by optical fiber. The sensor probe has the characteristics of high voltage
resistance and electromagnetic interference resistance, and the power consumption is
less than 2.0 mW. Experiments have verified the feasibility of measuring temperature,
high current and other parameters with this method. The developed instrument has
higher detection sensitivity and accuracy.