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Radiative transfer code for calculating UV, VIS, and IR spectral signatures and synthetic imagery.

SIG3D Overview

SIG3D is a parallelized radiation transfer code for calculating visible, infrared, and long wavelength ultra-violet optical signatures for a wide class of multiphase fluid applications. It provides error-quantified electro-optical/infra-red (EO/IR) predictions which in turn makes it possible to apply EO/IR analysis to problems which otherwise would require intensive human intervention or include severe practical limitations.

SIG3D automatically locates emitting/absorbing flowfield and/or hardbody regions which may potentially be of EO/IR relevance and samples those regions with Lines-of-Sight (LOS) until solution convergence. SIG3D has been demonstrated on a wide range of problems and contains several features that minimize the role of a ‘man-in-the-loop’ to simplify the optical analysis. The tool uses a “cloud-of-points” methodology for increased flexibility for application with structured, unstructured, facet-list, etc. numerical solutions including direct interfacing with all CRAFT Tech’s in-house solvers.

SIG3D_Methods

IR Emission Imagery

Absorption Spectroscopy

Advanced Functionality and Abilities

UV/VIS/IR Emission

Calculates emissive intensities exporting spectra, radiant intensity, and radiance

Hi-Res Imagery

Calculates high resolution in-band radiance imagery implementing spectra residual convergence

Multiple Fields of View (FOV)

Multiple rectangular/circular FOVs can be specified for both sequential and parallel runs

Broad-band and narrow band

Radiation transport calculations can be run over both broad-band and/or user-specified narrow band filters

Hardbody emission/scattering

Calculates the combined absorption/emission from hardbody surfaces of variable temperatures, emissivities, reflectivity parameters, etc. embedded in emitting/absorbing multiphase flowfields

Automated Target Sweeps

Orientation-sensitive analysis can be performed using automated sweeps based on user-specified observer-to-target angles

Aerosol multi-scattering effects

For strongly scattering particle flows and clouds, will perform multiple scattering effects from particles using a Monte Carlo methodology

Surface irradiance

Calculates the hemispherical irradiance along a discretized surface in embedded flows

Line-of-sight transmission/absorbance

Performs single-path analysis for determining transmission of a source (e.g. laser) through a medium

Contrast against background

Will calculate image contrast of a specific wavelength range against a background

NLTE Emission

Calculates molecular excitation of certain molecules in Non-Local Thermal Equilibrium

Point Cloud Methodology

Algorithms works with generalized numerical data of arbitrary shape, structure, and format

Note: SIG3D is only available for distribution within the U.S.

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