A Non-Contact Thermal Barrier Coating (TBC) Heat Flux Sensor Using a Self Calibrating Multiwavelength Pyrometer

摘要

Non-contact heat flux measurements have been demonstrated using crystalline sapphire and polycrystalline alumina as the working material and a multiwavelength pyrometer as the measuring device. Heat flux sensing is now achieved using a 25 micro m thick nanostructured thermal barrier coating (TBC) on 3 mm thick sapphire substrate. Advanced nanostructured TBCs transmits in the infrared region and are capable of producing even larger temperature differences than the traditional flame sprayed zirconia TBC. Though a 1 mm (40 mil) thick flame sprayed zirconia TBC produced the desired temperature difference, it transmitted less than 0.2 of the radiation in the short wavelength region, making it less suitable as a heat flux sensor.