New, more accurate than all previous, model of reflection that can be fitted to the measured BRDFs is developed(click here for detail). The article has to be published in Applied Optics 51 (2012).
Now, Virial International offers two new state-of-the-art blackbody emissivity modeling programs:
STEEP323 for axisymmetrical cavities and
INCA333 for a cylindrical cavity with an inclined bottom

Virial International, LLC is the only provider of scientific software and services for optical radiometry, photometry, and radiation thermometry. Our company is oriented on support of various research involved precision measurements of optical radiation and has a great experience in co-operation with world leading metrological centers, governmental agencies, universities, and industrial companies. Virial International has no competitors because
WE CAN DO WHAT NO ONE ELSE CAN.
Created in 2000 as Virial, Inc., the company has been transformed into Limited Liability Company 04/20/2011. Virial, Inc. was a developer of STEEP3 program, which become de facto standard software for numerical modeling of radiation characteristics of blackbody calibration sources. This program is based on the proprietary Monte Carlo algorithm and used in national metrological centers of USA, UK, Germany, Canada, Japan, France, the Netherlands, Russia, Spain, Finland, South Korea, R. P. China, Taiwan, Mexico, and others. We have STEEP3 (and its successors) customers in NASA, Space Dynamics Laboratory (Logan, UT), Space Science and Engineering Center (University of Wisconsin-Madison), Sub-department of Atmospheric, Oceanic and Planetary Physics (Department of Physics, University of Oxford, UK), and in world-leading high-tech companies.
Here you can find anything but complete list of scientific publications for which the results were obtained using Virial's software. All Virial's developments are based on the knowledge and more than twenty-five-year experience in the optical radiometry of company's founder and president, Dr. Alexander Prokhorov.
Currently, Virial International not only improves the blackbody emissivity modeling software and enlarges its area of applicability, but also offers a range of all-purpose radiometric programs that are necessary for everyone dealing with precise measurements of optical radiation. If you are looking for a specialized software for optical radiometry and radiation thermometry, only Virial International has what you need. You can download evaluation versions of our software and detailed manuals for free. If your problems involve numerical analysis or computer modeling of radiometric measurement devices or processing of measured data, Virial International will help you to solve them. Our services include calculations on demand, thermal modeling, data processing, uncertainty analysis, customization of existing software, new software development, and scientific and engineering consulting. We provide contract engineering and scientific services for development of new ideas, designs and comprehensive assessments of innovative technical concepts. We are always open for mutually beneficial collaboration in the areas of our joint scientific interests.
We invite our visitors to explore www.virial.com and see for yourself why customers have permanently turned to our software and services for the past 10 years.