Laminated helmet materials characterization by terahertz kinetics spectroscopy

Anis Rahman; Aunik K. Rahman

doi:10.1117/12.2084577

13 May 2015 Laminated helmet materials characterization by terahertz kinetics spectroscopy

Anis Rahman, Aunik K. Rahman

Proceedings Volume 9483, Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense; 94830N (2015) https://doi.org/10.1117/12.2084577
Event: SPIE Sensing Technology + Applications, 2015, Baltimore, MD, United States

Abstract

High speed acquisition of reflected terahertz energy constitutes a kinetics spectrum that is an effective tool for layered materials' deformation characterization under ballistic impact. Here we describe utilizing the kinetics spectrum for quantifying a deformation event due to impact in material used for Soldier's helmet. The same technique may be utilized for real-time assessment of trauma by measuring the helmet wore by athletes. The deformation of a laminated material (e.g., a helmet) is dependent on the nature of impact and projectile; thus can uniquely characterize the impact condition leading to a diagnostic procedure based on the energy received by an athlete during an impact. We outline the calibration process for a given material under ballistic impact and then utilize the calibration for extracting physical parameters from the measured kinetics spectrum. Measured kinetics spectra are used to outline the method and rationale for extending the concept to a diagnosis tool. In particular, captured kinetics spectra from multilayered plates subjected to ballistic hit under experimental conditions by high speed digital acquisition system. An algorithm was devised to extract deformation and deformation velocity from which the energy received on the skull was estimated via laws of nonrelativistic motion. This energy is assumed to be related to actual injury conditions, thus forming a basis for determining whether the hit would cause concussion, trauma, or stigma. Such quantification may be used for diagnosing a Soldier’s trauma condition in the field or that of an athlete's.

Citation Download Citation

Anis Rahman and Aunik K. Rahman "Laminated helmet materials characterization by terahertz kinetics spectroscopy", Proc. SPIE 9483, Terahertz Physics, Devices, and Systems IX: Advanced Applications in Industry and Defense, 94830N (13 May 2015); https://doi.org/10.1117/12.2084577

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KEYWORDS

Calibration

Terahertz spectroscopy

Digital image correlation

Terahertz radiation

Injuries

Multilayers

Spectroscopy

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