Abstract
An ablation sensor which can measure surface recession and thermal decomposition in an ablative heat shield was developed. In this sensor, the two measurement principles are implemented into a miniaturized unit. For the surface-recession detection, an ablative rod with embedded optical fibers were used, and for the thermal decomposition rate measurement, polyimide tubes with resistive wire were adopted. During operation, the surface-recession sensor component detects thermal-emission transitions from the ablative material to shock layer, and the char sensor component works as an electric circuit that changes its resistance along with the polyimide tube’s carbonization. The proposed ablation sensor was tested in an arcjet experiment and results showed that the measurement principles for surface recession and thermal-decomposition rates were successfully demonstrated.
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Acknowledgments
This research was supported by Japan Society for Promotion of Science as Grant-in-Aid for Scientific Research (B), No. 24360349. The authors would like to thank the staff of Wind Tunnel Technology Center of JAXA for their support for arcjet testing.
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Sakai, T., Nakazawa, H., Dantsuka, Y., Kitagawa, K., Hirai, K., Ishida, Y. (2017). In Situ Ablation Measurement for an Ablative Heat Shield Using an Embedded Sensor. In: Ben-Dor, G., Sadot, O., Igra, O. (eds) 30th International Symposium on Shock Waves 2. Springer, Cham. https://doi.org/10.1007/978-3-319-44866-4_7
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DOI: https://doi.org/10.1007/978-3-319-44866-4_7
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