Dr. Hongtao Zhang Profile

Dr. Hongtao Zhang

at Univ of Massachusetts Lowell

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Proceedings Article | 3 June 2011 Paper

Study of blast event propagation in different media using a novel ultrafast miniature optical pressure sensor

Xiaotian Zou, Nan Wu, Ye Tian, Hongtao Zhang, Christopher Niezrecki, Xingwei Wang

Proceedings Volume 8028, 802809 (2011) https://doi.org/10.1117/12.887225

KEYWORDS: Multimode fibers, Optical fibers, Ultrafast phenomena, Silica, Sensors, Fiber optics sensors, Sensor performance, Wave propagation, Traumatic brain injury, Acoustics

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Traumatic brain injury (TBI, also called intracranial injury) is a high potential threat to our soldiers. A helmet structural health monitoring system can be effectively used to study the effects of ballistic/blast events on the helmet and human skull to prevent soldiers from TBI. However, one of the biggest challenges lies in that the pressure sensor installed inside the helmet system must be fast enough to capture the blast wave during the transient period. In this paper, an ultrafast optical fiber sensor is presented to measure the blast signal. The sensor is based on a Fabry-Pérot (FP) interferometeric principle. An FP cavity is built between the endface of an etched optical fiber tip and the silica thin diaphragm attached on the end of a multimode optical fiber. The sensor is small enough to be installed in different locations of a helmet to measure blast pressure simultaneously. Several groups of tests regarding multi-layer blast events were conducted to evaluate the sensors' performance. The sensors were mounted in different segments of a shock tube side by side with the reference sensors, to measure a rapidly increasing pressure. The segments of the shock tube were filled with different media. The results demonstrated that our sensors' responses agreed well with those from the electrical reference sensors. In addition, the home-made shock tube could provide a good resource to study the propagation of blast event in different media.

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