Requirements definition by numerical simulation

James J. Hickman; Chris Kostas; Kang T. Tsang

doi:10.1117/12.189189

6 October 1994 Requirements definition by numerical simulation

James J. Hickman, Chris Kostas, Kang T. Tsang

Proceedings Volume 2276, Cargo Inspection Technologies; (1994) https://doi.org/10.1117/12.189189
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

We are investigating the issues involved in requirements definition for narcotics interdiction: how much of a particular signature is possible, how does this amount change for different conditions, and what is the temporal relationship in various scenarios. Our approach has been to simulate numerically the conditions that arise during vapor or particulate transport. The advantages of this approach are that (1) a broad range of scenarios can be rapidly and inexpensively analyzed by simulation, and (2) simulations can display quantities that are difficult or impossible to measure. The drawback of this approach is that simulations cannot include all of the phenomena present in a real measurement, and therefore the fidelity of the simulation results is always an issue. To address this limitation, we will ultimately combine the results of numerical simulations with measurements of physical parameters for inclusion in the simulation. In this paper, we discuss these issues and how they apply to the current problems in narcotics interdictions, especially cargo containers. We also show the results of 1D and 3D numerical simulations, and compare these results with analytical solutions. The results indicate that this approach is viable. We also present data from 3D simulations of vapor transport in a loaded cargo container and some of the issues present in this ongoing work.

Citation Download Citation

James J. Hickman, Chris Kostas, and Kang T. Tsang "Requirements definition by numerical simulation", Proc. SPIE 2276, Cargo Inspection Technologies, (6 October 1994); https://doi.org/10.1117/12.189189

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