A resistance circuit ablation sensor is developed by using commercially available materials. The resistance circuit has a multi-layered configuration made of a CFRP rod, polyimide tube, and nichrome wire. The resistance of the spirally wound nichrome wire is measured via a four terminal method. The ablation sensor is embedded into a graphite test specimen and is heated in an arcjet wind tunnel flow in order to examine the operational characteristics of the developed sensor. The results show that the sensor can be used to measure the advancement of a high temperature location within the test specimen used in the present study.
2014 The Japan Society for Aeronautical and Space Sciences