Preparation and performance study of miniature heat flux sensor based on thermopile
The non-uniform distributions of temperature and thermal radiation inside aero-engine may lead to hot spots on the blade surface,causing material damage in regions such as the blade tip.Therefore,it is very important to monitor the heat passing through the blade surface per unit time.Thermopile-type heat flux sensor has become a common method for monitoring the heat flow parameter in high-temperature environment due to its advantages such as wide measurement range,good stability,and high precision.A Pt-Rh10/Pt thermopile-type heat flux sensor is fabricated on a 99%Al2 O3 ceramic substrate of 10mm×10mm×1 mm by screen printing and high-temperature sintering process,and a heat flux experimental platform is built to test the sensor.The results show that the measured heat flux density is 179.67 kW/m2 and the output voltage of the heat flux sensor is 0.4623 mV at a high-temperature environment of 1019.4℃.After three thermal cycle tests,it can be seen that the repeatability deviation of the heat flux sensor is less than 5%,and it has a good repeatability.
high temperature envionmentheat flux monitoringthermal resistance layerthermoelectric effectheat flux sensor