13 September 2007 Optically based velocity and topographic measurement systems in the nano-scale for developing optical initiation
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Abstract
We have developed a suite of optical diagnostics and analyses for probing the velocity and spatial distribution of ablatively launched metal with nano-scale precision. We utilize a nanosecond laser pulse to launch a thin layer of metal and then use optical and opto-electronic devices to diagnose the velocity and topography. Our Photonic Doppler Velocimeter (PDV) utilizes the heterodyne principle that allows us to track multiple velocity components. We have investigated a number of different methods for analyzing this data to provide increased velocity and temporal resolution. We also discuss the possibilities to extend the sensitivity of the PDV system to provide a compact diagnostic with a broad range of capabilities. Our topographer is based on the Shack-Hartmann interferometer that can resolve the changing shape of the ablated metal surface as it is launched. We compare the experimental data to hydrodynamic simulations to provide a feedback loop to improve our theoretical models. The ultimate goal is to develop a well-understood laser-based firing set for direct optical initiation (DOI) of explosives.
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A. R. Valenzuela, G. Rodriguez, S. A. Clarke, "Optically based velocity and topographic measurement systems in the nano-scale for developing optical initiation", Proc. SPIE 6662, Optical Technologies for Arming, Safing, Fuzing, and Firing III, 66620A (13 September 2007); doi: 10.1117/12.734959; https://doi.org/10.1117/12.734959
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