10 April 2014 Fiber optic temperature profiling for thermal protection heat shields
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Abstract
Reliable Thermal Protection System (TPS) sensors are needed to achieve better designs for spacecraft (probe) heatshields for missions requiring atmospheric aero-capture or entry/reentry. In particular, they will allow both reduced risk and heat-shield mass minimization, which will facilitate more missions and allow increased payloads and returns. For thermal measurements, Intelligent Fiber Optic Systems Corporation (IFOS) is providing a temperature monitoring system involving innovative lightweight, EMI-immune, high-temperature resistant Fiber Bragg Grating (FBG) sensors with a thermal mass near that of TPS materials together with fast FBG sensor interrogation. The IFOS fiber optic sensing technology is highly sensitive and accurate. It is also low-cost and lends itself to high-volume production. Multiple sensing FBGs can be fabricated as arrays on a single fiber for simplified design and reduced cost. In this paper, we provide experimental results to demonstrate the temperature monitoring system using multi-sensor FBG arrays embedded in small-size Super-Light Ablator (SLA) coupon, which was thermally loaded to temperatures in the vicinity of the SLA charring temperature. In addition, a high temperature FBG array was fabricated and tested for 1000°C operation.
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Richard J. Black, Richard J. Black, Joannes M. Costa, Joannes M. Costa, Behzad Moslehi, Behzad Moslehi, Livia Zarnescu, Livia Zarnescu, Drew Hackney, Drew Hackney, Kara Peters, Kara Peters, } "Fiber optic temperature profiling for thermal protection heat shields", Proc. SPIE 9062, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2014, 906204 (10 April 2014); doi: 10.1117/12.2057942; https://doi.org/10.1117/12.2057942
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