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Design and study on a probe laser humidity sensor in high voltage converter transformer bushing

A heat-resistant probe humidity sensor based on tunable diode laser absorption spectroscopy is designed and studied, which is equipped with heat-resistant probe, infrared laser, gas cell, detector, temperature and pressure sensor and circuit board. The diffusion part of the probe is 3cm, and the actual length of the optical path is 6cm. An absorption line of H2O near 1368.6nm in the v2+v3 band is selected by the sensor as the targeted line, and combined with the techniques of software lock-in amplification and Savitzky-Golay filtering, it achieved a rapid and accurate measurement of high temperature and humidity environment. The characteristics of the sensor under variable temperature and pressure and measurement index are studied experimentally on a experimental platform of humidity detection with controllable temperature and pressure. The results show that with the increase of temperature, signal intensity decreases gradually, and as pressure increase, the line broadening gradually widens. The measurement accuracy of sensor is RH⪅0.5% at high temperature. It can be found out that our sensor can meet the requirement of humidity detection in high temperature drying process. In contrast to the traditional humidity detection methods, this sensor has the advantages of fast measurement speed, high accuracy, fast response time and not susceptible to fluctuations in air flow, which can be a promising technical means for the development of related industries.