RayJackONE - Fast and efficient simulation of multiple scattering

Fast and efficient simulation of multiple scattering in RayJack ONE®

Scattered light is one of the main contributors of stray light in optical instruments. When multiple scattering is relevant, standard simulation techniques are pushed to their limits requiring excessively long computation times.

RayJack ONE® offers a novel technique for multiple scattering. At each scattering event an “observation ray” is sent towards the detector, leading to a much better ray statistics compared to brute-force multiple scattering ray tracing. With this feature, simulation time can be reduced by orders of magnitude in many practically relevant cases.

The figure below explains the principle for a baffle illuminated by a light source outside its exclusion angle. Lots of observation rays (shown in light orange) hit the detector; without using observation rays, just two rays would have arrived on the detector.