Ultra fast all-optical fiber pressure sensor for blast event evaluation

Nan Wu; Wenhui Wang; Ye Tian; Christopher Niezrecki; Xingwei Wang

doi:10.1117/12.885104

17 May 2011 Ultra fast all-optical fiber pressure sensor for blast event evaluation

Nan Wu, Wenhui Wang, Ye Tian, Christopher Niezrecki, Xingwei Wang

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77535J (2011) https://doi.org/10.1117/12.885104
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

Traumatic brain injury (TBI) is a great potential threat to soldiers who are exposed to explosions or athletes who receive cranial impacts. Protecting people from TBI has recently attracted a significant amount of attention due to recent military operations in the Middle East. Recording pressure transient data in a blast event is very critical to the understanding of the effects of blast events on TBI. However, due to the fast change of the pressure during blast events, very few sensors have the capability to effectively track the dynamic pressure transients. This paper reports an ultra fast, miniature and all-optical fiber pressure sensor which could be mounted at different locations of a helmet to measure the fast changing pressure simultaneously. The sensor is based on Fabry-Perot (FP) principle. The end face of the fiber is wet etched. A well controlled thickness silicon dioxide diaphragm is thermal bonded on the end face to form an FP cavity. A shock tube test was conducted at Natick Soldier Research Development and Engineering Center, where the sensors were mounted in a shock tube side by side with a reference sensor to measure the rapidly changing pressure. The results of the test demonstrated that the sensor developed had an improved rise time (shorter than 0.4 μs) when compared to a commercially available reference sensor.

Citation Download Citation

Nan Wu, Wenhui Wang, Ye Tian, Christopher Niezrecki, and Xingwei Wang "Ultra fast all-optical fiber pressure sensor for blast event evaluation", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77535J (17 May 2011); https://doi.org/10.1117/12.885104

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KEYWORDS

Sensors

Fiber optics sensors

Optical fibers

Traumatic brain injury

Silica

Multimode fibers

Ultrafast phenomena

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