BPDI based optical sensor for real-time high temperature measurements for the coal gasification process

摘要

Direct measurement of temperature in coal gasifiers requires a sensor technology that can withstand the extremely harsh environment posed by the high temperatures and corrosive agents present in these systems. An optical ultrahigh temperature measurement system is developed to address this critical need. This sensor is based on the broadband polarimetric differential interferometry (BPDI) sensing technology, in which optical spectrum is measured instead of direct detection of optical intensity. Resolution better than 0.1℃ and high precision are achieved over a wide dynamic measurement range from room temperature up to 1600℃. This optical thermometer is immune to optical source power fluctuations and fiber losses. The other advantages of this thermometer are its simplicity, low-cost and long-term stability in harsh environments.