Stray Light Analysis Using TracePro Data Sheet

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Intuitive Interface, Enhanced Monte-Carlo Simulation, Path Sorting, and Powerful Utilities Make TracePro an Ideal Tool for Stray Light Analysis


Stray light occurs in all optical and illumination systems, including ghost images in lens systems,
single and multiple scatter from optical and mechanical surfaces, as well as narcissus and
self-emission in infrared systems. Ghost images occur when light rays reflect from lens surfaces and reach
the image plane in an unwanted location. At any surface boundary, reflection, refraction, absorption,
reflective scatter, and transmissive scatter all may occur, each contributing to stray light.

Stray light resulting from each phenomenon can be accurately predicted and analyzed using TracePro.
TracePro’s stray light capabilities be accurately predictedand analyzed using TracePro.

TracePro’s stray light capabilities provide insight into determining problematic stray light paths.
TracePro’s analysis capabilities include visualization and quantification of any individual stray light path,
flux reports that detail how much light is incident and absorbed on each surface and object, as well
as 2D and 3D irradiance maps that allow visualization of stray light.

With TracePro’s ray splitting feature, a parent ray can be split into components (reflection, refraction,
transmissive and reflective scatter, and absorption). Ray splitting enables efficient sampling of rays
reflected from lens surfaces and is essential for ghost analysis.



TracePro’s Monte-Carlo ray tracing engine provides a powerful, general-purpose tool for simulation
of optical phenomena as probability distributions, and uses pseudo-random numbers to sample these
distributions. Variance-reduction techniques are employed to improve simulation efficiency by orders
of magnitude over crude Monte-Carlo.

Importance sampling is a variance reduction method used to increase sampling in low-probability paths
which would otherwise be under-sampled. A scatter distribution function is used to determine probability
density and apportion a fraction of the scattered ray flux into a desired direction. Importance sampling
can speed convergence of the simulation by orders of magnitude.

TracePro provides an intuitive design environment combined with powerful Monte-Carlo simulation,
scatter modeling, visualization and analysis features, as well as award-winning performance and accuracy
‚Äí offering a powerful tool for stray light analysis that is both fast and accurate.



TracePro is used extensively for stray light analysis and related applications, including:

  • Baffle design for stray light suppression
  • Analysis of stray light due to scattering,
    aperture diffraction, and ghost images
  • Self-emission of infrared and longer
    wavelength systems
  • Simulation of polarization effects including
  • Simulation of spectrometers and other
    multi-spectral systems
  • Thermal effects and loading
  • Narcissus effects
  • Diffraction gratings



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