Characterization of High-Frequency Thermal Sensor for Transient Temperature Measurement

Abstract

A thermal probe has been fabricated in-house from an E-type thermocouple (Chromel-constantan) for transient temperature measurements during the studies related to groundbased high speedflow phenomena. The thermo elements of the thermocouple are coupled in the format of coaxial sensor called as coaxial surface junction thermocouple (CSJT). The junction properties have been analysed qualitatively and quantitatively through field emission scanning electron microscopy (FESEM) technique and the configuration of the thermo elements have been observed through energy dispersive X-ray (EDX) technique. The thermal probe is then calibrated by using a fluid bath and used to study the shock wave phenomena in a shock tube, which produces shock waves in a laboratory scale. The thermal probe response is captured and compared with a standardized highsensitive pressure sensor signal. The in-housefabricated thermal probe response is quite fast and can be used to replace the highcost pressure sensor.