INCA333 computes spectral effective emissivities and radiance temperatures for a cylindrical cavity with an incined flat bottom and flat annular diaphragm. INCA333 is the only blackbody emissivity modeling program allowing to model cavities of such a shape. It employs the 3C BRDF model, which allows to reproduce adequately optical characteristics for the absolute majority of materials used in design of blackbody  radiators operating  from UV to Far IR. Program contains the innovative algorithms for fitting parameters of the 3C model to measured in-plane BRDFs and for  splitting spectral reflectance onto components of the 3C model. If experimental data are insufficient, INCA333 allows to build a priori 3C BRDF model and perform parametric study. For details, see INCA333 Key Features list, Comparative Table, or download the Manual.

Download INCA333 Evaluation Version (8.2 MB)

Download INCA333 Manual (6.1 MB)

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INCA333 Key Features
INCA333 is based on the proprietary algorithm of the Monte Carlo ray tracing method (MCRT) implemented for the cavity with inclined bottom and adapted for the 3C BRDF model.

INCA333 has the unique utility that uses the particle swarm optimization technique for multidimensional global optimization applied to the fitting of the 3C model parameters to the measured in-plane BRDFs. Besides, INCA333 allows to extend the applicabilty of the BRDF parameters fitted for one wavelength to the spectral range in which blackbody radiation characteristics should be computed. The use of experimental data for materials and coatings of the internal surface of a blackbody radiating cavity provides the highest reliability for results of numerical modeling.

INCA333 doesn't require special efforts for installation. Download the Evaluation Version, unzip it, save INCA333 folder in the convenient place on the hard drive and run INCA333.exe. The Evaluation Version has several restrictions (see details in the appropriate Section of the Manual.) After purchasing the product license, you'll receive the activation key which will turn the Evaluation Version into the full-functioned unrestricted program. The Software Licence Agreement is included into the Manual. Go to the Purchase page to see how to buy the license.

Although INCA333 is simple to use and has user-friendly interface, such sophisticated tasks like building the 3C BRDF model and interpreting the results of Monte Carlo modeling may require special knowledge and experience. Therefore, Virial International recommends to purchase INCA333 together with the technical support subscription: subscribers can rely on the one-year unlimited support from Virial International in resolving the most complicated computational problems of blackbody radiometry and assistance in the results interpretation.
Modeling of isothermal and nonisothermal cylindrical cavities with a flat inclined bottom with or without a flat annular diaphragm
One-dimensional (along the cylinder axis) temperature distribution specified for up to 1001 points
Successive (wavelength-by-wavelength) calculation of effective emissivities and radiance temperatures for up to 501 wavelengths
Possibility to build 3C BRDF model from scratch or to fit its parameter to in-plane BRDFs measured at up to 6 incidence angles for one wavelength
Possibility to split the spectral directional-hemispherical reflectance measured at one incidence angle into the components of 3C reflection model to make it wavelength-dependent
Calculation of effective emissivities and radiance temperatures of a cavity; possibility to take into account the contribution of a background radiation
Three types of viewing conditions (Normal, Conical for divergent and convergent viewing beams, and Integrated)
Successive calculations for up to 201 viewing conditions of the same type
Built-in expandable databases for:
· Geometrical parameters, reflection models for materials, temperature distribution, and viewing conditions
· Measured BRDFs and spectral directional-hemispherical reflectances, results of BRDF fitting and spectral reflectance splitting
· Wavelength-dependent 3C BRDF models for cavity materials
· Computed spectral effective emissivities and radiance temperatures
Interpolation of spectral data stored in the database on the prescribed wavelength set
Automatically generated reports in ASCII format
Editable, exportable, and  printable 2D graphs representing:
· Scaled cross-sections of a cavity
· Viewing conditions
· Measured and fitted BRDFs; measured spectral reflectances and results of spectral splitting
· Dependence of 3C model parameters on wavelength
· Temperature distributions along cilinder axis
· Dependences of effective emissivities and radiance temperatures on the wavelength
· Dependences of effective emissivities and radiance temperatures on one variable parameter of viewing conditions
Possibility to save 2D graph data in text file or as MS Excel spreadsheet
3D interactive and editable plots of 3C BRDF models in spherical coordinate system
Possibility to save 3D graph data in text file
Possibility to save in file or copy to clipboard 2D and 3D graphs as bitmap
Requirements to hardware and software:
· CPU frequency 1.66 GHz
· Screen resolution 1600 1024
· RAM 3 GB
· Hard disk space 15 MB
· Video card 1 GB video RAM; OpenGL 2 compatible
· OS MS Windows® XP (with the SP3), Vista, 7, and 8 (in compatibility mode)