High Speed Thermal Imaging Diagnostics for Ballistic Impacts: A Reactive Material Fundamental Analysis
Abstract
The goal of this proposal is to develop the capability to spatially analyze the transientthermal behavior of reactive material projectiles penetrating or impacting targets. Currently mosthigh velocity impact chambers are equipped with pressure sensors and imaging cameras butspatially and temporally resolved thermal measurements are lacking. Temperature data isfundamental to our understanding of the physics controlling reactive material energy conversionand release in dynamic impact events. The multi-stage compression, penetration, fragmentation,ignition and reactions affect the rate of energy conversion and release as well as the extent ofenhanced blast effects. Ballistic impact analysis is a fundamental challenge across the DoDdomain, and technology adapted to address this challenge is needed. This project will develop acritical temperature measurement technique for ballistic reactions that typically exceed 3000 Ktemperatures by using the visible emission spectrum for imaging pyrometry. The equipmentproposed is a Vision Research Phantom v2640 high speed color camera that offers 4Mpxresolution and reaches acquisition rates up to 26 Gpx/sec. Benefiting from the high responsivityand high speed of the CMOS detector, the time resolution of the temperature measurements canbe smaller than 3.3 s for a single 13.5 m pixel and a field of view ranging from 6000 mm2 (i.e.,target-projectile interaction) to 10,000 mm2 (flame propagation through chamber). This resolutionand frame capture rate are ideal for reactions occurring upon projectile penetration, fragmentationand impact at our highest launch velocities of 1,500 m/s. Also, the 150 ns exposure timesignificantly reduces motion blur than can obscure data collection. Alongside the temperaturemeasurements, imaging with the Phantom v2640 will provide much needed resolution forfragmentation analysis. These experiments are a primary diagnostic in the determination ofequations of state of materials, in which temperature is an important parameter. Advancing thermalimaging for ballistic impact reactions will benefit on-going and future ONR supported projectsand collaborations by offering new capabilities for optimizing key energetic performance metrics.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 05, 2021
- Source ID
- N000142112313
Entities
People
- Michelle L. Pantoya
Organizations
- Office of Naval Research
- Texas Tech University System
- United States Navy