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Plume Radiance Analysis

ZSU Tank with Plume rendered in MWIRZSU Tank with Plume rendered in MWIR

The Plume Module for MuSES enables you to include plume radiance for BRDF renderings. The radiance values are computed using imported plume temperatures and chemical species data from a computational fluid dynamics (CFD) code, such as Fluent or Star-CCM.

The total signature of the target—hardbody and plume is thus rendered over the user-defined bandwidth of the sensor. MuSES casts rays from the sensor position through the plume and computes radiances along the line of sight to the hardbody. This results in a seamless computation of radiance and detailed reporting of pixel counts and radiance of the plume, the target hardbody and the background.

Principal FeaturesPlume infrared analysis rendering of jet in MWIR

  • Plume radiance rendered seamlessly with hardbody and background
  • Plume radiance statistics reported in BRDF rendered output
  • MuSES casts rays from each pixel toward target and background
  • Rays intersecting the plume volume mesh from CFD generate LOS data
  • Radiance code called for each LOS
  • Sensor-band radiance and attenuation along LOS are computed

Fully Integrated Infrared Plume Radiance

Plumes can contribute significantly to the overall infrared signature of a vehicle or system, with radiance from exhaust dominating the total signature under certain operating conditions. The Plume Module for MuSES intregrates a computed 3-dimensional plume field with the standard MuSES hardbody surface models to yield a highly accurate and realistic composite rendering for ships, aircraft and ground vehicles.

Accurate Reporting of Plume Statistics

MuSES casts rays from the sensor position through the plume and computes radiances along the line of sight to the hardbody. This results in a seamless computation of radiance and detailed reporting of pixel counts and radiance of the plume, the target hardbody, and the background.

Seamless Integration within MuSES

The Plume Module operates within the MuSES environment. The license is loaded automatically and the user needs only to specify the names of input files and threshold values to truncate "cold" or dispersed areas of the plume.

MuSES Plume Rendering Input Data

The user will need to specify a mesh file and results file from a CFD code. Plume data are imported on a 3D cell basis and can include pressure, temperature, and mole fraction of H2O, CO2, CO, and soot. Radiant emissions and transmittance of background radiance are computed automatically as part of the BRDF rendering. The user can choose to include reflections of plume radiance off the hardbody of the target.

Limiting Render Time

Because the computation of emittance and transmittance along each line of sight through the plume is processor intensive, the total size of the plume boundary can be truncated by a threshold temperature or a threshold concentration of plume species. Higher threshold values reduce BRDF computation time by reducing the net size of the plume to regions where concentration and temperature either occlude the background or produce significant emissions.

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