Use of the photon mapping methods for the optical systems stray light analysis

Kinev, Igor; Potemin, Igor S.; Lemeshev, Andrei; Zhdanov, Andrey; Arhipova, Ludmila N.; Larionov, S. A.; Zhdanov, Dmitry

doi:10.1117/12.2601631

Cited by 2 publications

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“…To find sources of scattered radiation, a special method was proposed for calculating and visualizing related illumination 6 . Schematically, this solution is shown in Figure 2.…”

Section: Reviewmentioning

confidence: 99%

“…Another example of the use of multicriteria in scattered light analysis problems is the formation of an image obtained after a certain scattering event on a structural element of an optical device. The related illuminance calculation method 6 calculates the image illuminance generated by the diffusing element of the optical device and stores it in the region of formation of this illuminance. Figure 2 demonstrates this process.…”

Section: Multicriteria Application For Stray Light Analysismentioning

confidence: 99%

“…However, this approach is not very efficient in calculating stray radiation in the case of diffuse light scattering on the elements of an optical device. To solve this problem, it is advisable to use the method of bidirectional stochastic ray tracing with backward photon maps, which allows you to physically correctly calculate the distribution of stray radiation on the image surface and visualize the sources of this radiation on the surfaces of an optical device 6 . In the case of visualization of light scattering sources, the accumulation of stray illumination occurs on the surfaces of optical parts and structural elements of an optical device.…”

Section: Introductionmentioning

confidence: 99%

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Using multicriteria for ray propagation to analyze scattered light in optical devices

Zhdanov

Kinev

Zhdanov

et al. 2022

Optical Design and Testing XII

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This article explores the possibility of using multicriteria applied to the ray tracing result processing method to improve the efficiency of performing groups of repetitive calculations. If the usual ray tracing criterion is a filter that passes rays in accordance with some condition, usually a series of events that must happen to the ray by the time it reaches the radiation receiver, then multicriteria contains not one criterion, but a set of criteria, each of which is assigned to certain result of the calculation. The proposed concept of multicriteria was developed to solve the problems of scattered light analysis in optical imaging devices. Existing mechanisms make it possible to find sources of stray illumination of an image, but they only show the average value of stray illumination formed by an element of an optical device. In most cases, it is necessary to know the nature of the distribution of stray illumination in the image. Using the concept of multicriteria allows you to effectively solve this problem. Within the framework of one computational process, criteria are formed that correspond to the detected scattered light sources, and each of the criteria is associated with its own image. Using a special technique of ray tracing and processing of ray tracing results, separate results are generated for each of the criteria. This technique can be used not only for the analysis of scattered light, but also for modeling multichannel and multiconfiguration systems. The paper presents the results of scattered light simulation in two optical devices and virtual prototyping of the GP-200 goniophotometer.

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“…To find sources of scattered radiation, a special method was proposed for calculating and visualizing related illumination 6 . Schematically, this solution is shown in Figure 2.…”

Section: Reviewmentioning

confidence: 99%

Section: Multicriteria Application For Stray Light Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Using multicriteria for ray propagation to analyze scattered light in optical devices

Zhdanov

Kinev

Zhdanov

et al. 2022

Optical Design and Testing XII

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“…Partially, the use of the photon mapping methods for stray light analysis in its initial form was presented in the SPIE conference. 27 It should be noted that the methods based on photon maps are biased; 20 however, the correct choice of the radius of the integration sphere and the collection point of secondary illumination (shift of the integration point on a larger surface, selection of integration points on surfaces with smoother bidirectional reflectance distribution function (BRDF), and far from bright light sources) allows to reduce the bias error of this method to a minimum.…”

Section: Related Workmentioning

confidence: 99%

“…An important advantage of the method of backward photon maps in comparison with the method of forward photon maps is the possibility of determining the optimal radii of integration spheres in the process of generating visibility maps, which can significantly speed up the process of calculating the radiance of secondary and caustic illumination. Partially, the use of the photon mapping methods for stray light analysis in its initial form was presented in the SPIE conference 27 …”

Section: Related Workmentioning

confidence: 99%

Methods of visual analysis in the design of the stray light protection of optical devices

et al. 2022

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.We provide an analysis of the existing methods for calculating parasitic illumination, methods for its analysis, and visualization. To search for and analyze the sources of stray light in optical devices, a software model of the beam propagation criterion in an optical device is proposed, which makes it possible to select beams that satisfy a given criterion. We consider the possibility of using the method of bidirectional progressive stochastic ray tracing with inverse photon maps to calculate the stray illumination of an image and analyze the causes of its occurrence. To analyze the sources of stray illumination on the radiation detector, it was proposed to use progressive photon maps, which calculated the caustic and secondary components of the illumination and fixed the image illumination on a static regular mesh attached to the surfaces of the optical device. Special visualization tools allow the display of this illumination over the image of an optical device and determination of the elements of the device that have the greatest impact on the level of stray illumination of the image. We present examples of calculation, analysis, and visualization of parasitic illumination of a number of optical systems of lenses with real mechanical structures.

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Use of the photon mapping methods for the optical systems stray light analysis

Cited by 2 publications

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Using multicriteria for ray propagation to analyze scattered light in optical devices

Using multicriteria for ray propagation to analyze scattered light in optical devices

Methods of visual analysis in the design of the stray light protection of optical devices

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