{"id":28054,"date":"2023-08-07T21:48:05","date_gmt":"2023-08-07T20:48:05","guid":{"rendered":"https:\/\/piseo.fr\/?p=28054"},"modified":"2024-02-14T09:55:44","modified_gmt":"2024-02-14T08:55:44","slug":"stray-light","status":"publish","type":"post","link":"https:\/\/piseo.fr\/en\/optical-consulting-engineering-posts\/our-skills\/stray-light\/","title":{"rendered":"Stray light"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">The phenomena of stray light (or flare) reduce the performance of optical imaging systems. It is necessary to identify their causes in order to reduce or even eliminate them by acting on the system\u2019s physical parameters. PIS\u00c9O experts master these optical manifestations. Thanks to their knowledge of and expertise in optical simulation, they can help you understand and correct them.<\/p>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk-block stk-9a617f7 is-style-plain\" data-block-id=\"9a617f7\"><style>.stk-9a617f7{border-style:solid !important;border-color:#dfdad1 !important;border-top-width:0px !important;border-right-width:0px !important;border-bottom-width:1px !important;border-left-width:0px !important;padding-bottom:24px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-d2edaee stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"d2edaee\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-d2edaee-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-d2edaee-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-7c63a1c\" data-block-id=\"7c63a1c\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-45770f2\" id=\"what-is-stray-light\" data-block-id=\"45770f2\"><h2 class=\"stk-block-heading__text\">What is stray light?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-916a609\" data-block-id=\"916a609\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><linearGradient id=\"linear-gradient-916a609\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-916-a-609-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-916-a-609-color-2)\"><\/stop><\/linearGradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-f11971f stk-block-accordion__content\" data-v=\"4\" data-block-id=\"f11971f\"><style>.stk-f11971f-container{padding-top:0px !important;padding-right:0px !important;padding-bottom:0px !important;padding-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-f11971f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-f11971f-inner-blocks\">\n<p class=\"wp-block-paragraph\">Stray light refers to unwanted and unintended light in an optical system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These light rays are generally due to surface scattering of optical and mechanical components. Stray light can also come from internal reflection between components, unwanted surfaces, or surrounding light.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">They can appear in different ways in an image:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 A veil (veiling glare) resulting from the diffusion of light on the edges of the lenses or their surface.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"556\" src=\"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-1024x556.jpeg\" alt=\"\" class=\"wp-image-28443\" style=\"width:478px;height:260px\" srcset=\"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-1024x556.jpeg 1024w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-300x163.jpeg 300w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-768x417.jpeg 768w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-1536x833.jpeg 1536w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-2048x1111.jpeg 2048w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-150x81.jpeg 150w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-600x326.jpeg 600w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-696x378.jpeg 696w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-1392x755.jpeg 1392w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-1068x579.jpeg 1068w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/09\/dslr-camera-reflection-1920x1042.jpeg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\u2022 A ghost image: a sharp image seen by the sensor due to internal reflection on the surface of the lenses.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 A halo (flare): a more diffuse image closer to the light source.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2022 A starburst effect: linked to the shape of the diaphragm of an imaging system that diffracts light. This can be desired in photography for an artistic effect.<\/p>\n<\/div><\/div><\/div>\n<\/details>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk-block stk-a1dca81 is-style-plain\" data-block-id=\"a1dca81\"><style>.stk-a1dca81{border-style:solid !important;border-color:#dfdad1 !important;border-top-width:0px !important;border-right-width:0px !important;border-bottom-width:1px !important;border-left-width:0px !important;padding-bottom:24px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-b0f1f6a stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"b0f1f6a\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-b0f1f6a-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-b0f1f6a-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-4f968de\" data-block-id=\"4f968de\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-f8ea014\" id=\"how-does-stray-light-negatively-impact-the-image\" data-block-id=\"f8ea014\"><h2 class=\"stk-block-heading__text\">How does stray light negatively impact the image ?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-7bfb738\" data-block-id=\"7bfb738\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><linearGradient id=\"linear-gradient-7bfb738\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-7-bfb-738-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-7-bfb-738-color-2)\"><\/stop><\/linearGradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-434d08b stk-block-accordion__content\" data-v=\"4\" data-block-id=\"434d08b\"><style>.stk-434d08b-container{padding-top:0px !important;padding-right:0px !important;padding-bottom:0px !important;padding-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-434d08b-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-434d08b-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-833d57f\" data-block-id=\"833d57f\"><p class=\"stk-block-text__text\">Stray light is a problem in optics because it can disturb the final image and reduce its quality. The image may be fuzzy or hazy, making it difficult to identify important details, particularly in applications such as microscopy or the spatial domain, for example.<\/p><\/div>\n<\/div><\/div><\/div>\n<\/details>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk-block stk-8804e7d is-style-plain\" data-block-id=\"8804e7d\"><style>.stk-8804e7d{border-style:solid !important;border-color:#dfdad1 !important;border-top-width:0px !important;border-right-width:0px !important;border-bottom-width:1px !important;border-left-width:0px !important;padding-bottom:24px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-5c279e7 stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"5c279e7\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-5c279e7-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-5c279e7-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-1823622\" data-block-id=\"1823622\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-b79d60f\" id=\"what-are-the-most-sensitive-applications\" data-block-id=\"b79d60f\"><h2 class=\"stk-block-heading__text\">What are the most sensitive applications?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-b6b1c00\" data-block-id=\"b6b1c00\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><linearGradient id=\"linear-gradient-b6b1c00\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-b-6-b-1-c-00-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-b-6-b-1-c-00-color-2)\"><\/stop><\/linearGradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-a6e8f1f stk-block-accordion__content\" data-v=\"4\" data-block-id=\"a6e8f1f\"><style>.stk-a6e8f1f-container{padding-top:0px !important;padding-right:0px !important;padding-bottom:0px !important;padding-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-a6e8f1f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-a6e8f1f-inner-blocks\">\n<p class=\"wp-block-paragraph\">Imaging systems&nbsp;(projector, camera lens, etc.) are the most sensitive to stray light.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Indeed, these systems consist of several lenses, and multiple reflections on each face are liable to create undesirable artifacts. The optical subassemblies are integrated into a mechanical system that can reflect or diffuse light and create stray light.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><a id=\"_msocom_1\"><\/a><\/p>\n<\/div><\/div><\/div>\n<\/details>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk-block stk-8f2923e is-style-plain\" data-block-id=\"8f2923e\"><style>.stk-8f2923e{border-style:solid !important;border-color:#dfdad1 !important;border-top-width:0px !important;border-right-width:0px !important;border-bottom-width:1px !important;border-left-width:0px !important;padding-bottom:24px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-97d6782 stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"97d6782\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-97d6782-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-97d6782-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-d784f4c\" data-block-id=\"d784f4c\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-26d3aea\" id=\"how-to-reduce-stray-light\" data-block-id=\"26d3aea\"><h2 class=\"stk-block-heading__text\">How to reduce stray light?<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-3648a99\" data-block-id=\"3648a99\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><linearGradient id=\"linear-gradient-3648a99\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-3648-a-99-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-3648-a-99-color-2)\"><\/stop><\/linearGradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-883db25 stk-block-accordion__content\" data-v=\"4\" data-block-id=\"883db25\"><style>.stk-883db25-container{padding-top:0px !important;padding-right:0px !important;padding-bottom:0px !important;padding-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-883db25-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-883db25-inner-blocks\">\n<p class=\"wp-block-paragraph\">To reduce stray light, it is essential to detect its presence and understand its causes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Very often, the problem is first detected at the prototype stage and in tests carried out in<a href=\"https:\/\/piseo.fr\/en\/optical-laboratory-posts\/\" target=\"_blank\" rel=\"noreferrer noopener\"> the laboratory.<\/a>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Indeed, stray light phenomena are generally not considered when designing an optical imaging system by means of simulations&nbsp; in sequential mode (using a <a href=\"https:\/\/www.zemax.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Zemax<\/a>, for example). Stray light issues require careful consideration of the energy aspect and non-sequential propagation. A tool like <a href=\"https:\/\/www.synopsys.com\/optical-solutions\/lighttools.html\" target=\"_blank\" rel=\"noreferrer noopener\">LightTools<\/a>, mastered by PIS\u00c9O experts, is well suited for this.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"320\" src=\"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-1024x320.jpg\" alt=\"stray light PISEO\" class=\"wp-image-27982\" srcset=\"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-1024x320.jpg 1024w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-300x94.jpg 300w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-768x240.jpg 768w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-1536x480.jpg 1536w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-150x47.jpg 150w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-600x188.jpg 600w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-696x218.jpg 696w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-1392x435.jpg 1392w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO-1068x334.jpg 1068w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/image-ghost-PISEO.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">To assess the risks of these phenomena during the design or in an existing system, we create complete models of the optical components and their environment (mechanical, light sources) in this tool, faithful to reality. These models also account for the optical properties of materials (refractive index of lenses) and surfaces (BSDF, surface deposits, roughness). We then use the model to perform simulations that highlight the effects of stray light and investigate their causes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Once the causes are known, we can act on the system and propose improvements: geometry of optomechanical components, the addition of a baffle, anti-reflective coating, etc.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"320\" src=\"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-1024x320.jpg\" alt=\"parasite stray light\" class=\"wp-image-27977\" srcset=\"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-1024x320.jpg 1024w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-300x94.jpg 300w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-768x240.jpg 768w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-1536x480.jpg 1536w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-150x47.jpg 150w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-600x188.jpg 600w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-696x218.jpg 696w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-1392x435.jpg 1392w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite-1068x334.jpg 1068w, https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/saphir-parasite.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div><\/div><\/div><\/div>\n<\/details>\n\n\n\n<details class=\"wp-block-stackable-accordion stk-block-accordion stk-inner-blocks stk-block-content stk-block stk-cad7ae8 is-style-plain\" data-block-id=\"cad7ae8\"><style>.stk-cad7ae8{border-style:solid !important;border-color:#dfdad1 !important;border-top-width:0px !important;border-right-width:0px !important;border-bottom-width:1px !important;border-left-width:0px !important;padding-bottom:24px !important}<\/style>\n<summary class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-362a018 stk--container-small stk-block-accordion__heading\" data-v=\"4\" data-block-id=\"362a018\"><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-362a018-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-362a018-inner-blocks\">\n<div class=\"wp-block-stackable-icon-label stk-block-icon-label stk-block stk-4a3d007\" data-block-id=\"4a3d007\"><div class=\"stk-row stk-inner-blocks stk-block-content\">\n<div class=\"wp-block-stackable-heading stk-block-heading stk-block-heading--v2 stk-block stk-42feb52\" id=\"article-written-by-julie-bonnetto\" data-block-id=\"42feb52\"><h2 class=\"stk-block-heading__text\">Article written by Julie BONNETTO<\/h2><\/div>\n\n\n\n<div class=\"wp-block-stackable-icon stk-block-icon stk-block stk-a694079\" data-block-id=\"a694079\"><span class=\"stk--svg-wrapper\"><div class=\"stk--inner-svg\"><svg style=\"height:0;width:0\"><defs><linearGradient id=\"linear-gradient-a694079\" x1=\"0\" x2=\"100%\" y1=\"0\" y2=\"0\"><stop offset=\"0%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-a-694079-color-1)\"><\/stop><stop offset=\"100%\" style=\"stop-opacity:1;stop-color:var(--linear-gradient-a-694079-color-2)\"><\/stop><\/linearGradient><\/defs><\/svg><svg data-prefix=\"fas\" data-icon=\"chevron-down\" class=\"svg-inline--fa fa-chevron-down fa-w-14\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\" aria-hidden=\"true\" width=\"32\" height=\"32\"><path fill=\"currentColor\" d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div><\/span><\/div>\n<\/div><\/div>\n<\/div><\/div><\/summary>\n\n\n\n<div class=\"wp-block-stackable-column stk-block-column stk-column stk-block stk-e16693f stk-block-accordion__content\" data-v=\"4\" data-block-id=\"e16693f\"><style>.stk-e16693f-container{padding-top:0px !important;padding-right:0px !important;padding-bottom:0px !important;padding-left:0px !important}<\/style><div class=\"stk-column-wrapper stk-block-column__content stk-container stk-e16693f-container stk--no-background stk--no-padding\"><div class=\"stk-block-content stk-inner-blocks stk-e16693f-inner-blocks\">\n<div class=\"wp-block-stackable-text stk-block-text stk-block stk-afc97f7\" data-block-id=\"afc97f7\"><p class=\"stk-block-text__text\">Julie Bonnetto is a specialist in the design of industrial optical systems. She holds an Engineering degree in Optics, Photonics, and Industrial Vision, and a Research Master&#8217;s in photonic micro- and nano-structuring obtained at Telecom Saint-Etienne. Before joining PIS\u00c9O, she held engineering positions in the optical design and development of LED lighting systems at SIGNIFY (ex Philips Lighting), then LED indicators and lights operating in harsh environments at MAFELEC. His responsibilities within PIS\u00c9O include high-stakes optical design studies in fields as different as lighting, automotive, health, telecoms, luxury watchmaking, and biometrics.<\/p><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"433\" height=\"600\" src=\"https:\/\/piseo.fr\/wp-content\/uploads\/2020\/07\/Julie-BONNETTO.png\" alt=\"Julie BONNETTO\" class=\"wp-image-2925\" style=\"width:285px;height:395px\" srcset=\"https:\/\/piseo.fr\/wp-content\/uploads\/2020\/07\/Julie-BONNETTO.png 433w, https:\/\/piseo.fr\/wp-content\/uploads\/2020\/07\/Julie-BONNETTO-217x300.png 217w, https:\/\/piseo.fr\/wp-content\/uploads\/2020\/07\/Julie-BONNETTO-150x208.png 150w, https:\/\/piseo.fr\/wp-content\/uploads\/2020\/07\/Julie-BONNETTO-300x416.png 300w, https:\/\/piseo.fr\/wp-content\/uploads\/2020\/07\/Julie-BONNETTO-65x90.png 65w\" sizes=\"auto, (max-width: 433px) 100vw, 433px\" \/><\/figure>\n<\/div><\/div><\/div><\/div>\n<\/details>\n","protected":false},"excerpt":{"rendered":"<p>The phenomena of stray light (or flare) reduce the performance of optical imaging systems. It is necessary to identify their causes in order to reduce or even eliminate them by acting on the system\u2019s physical parameters. PIS\u00c9O experts master these optical manifestations. Thanks to their knowledge of and expertise in optical simulation, they can help [&hellip;]<\/p>\n","protected":false},"author":171492485,"featured_media":27973,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[7004,7006],"tags":[],"class_list":["post-28054","post","type-post","status-publish","format-standard","has-post-thumbnail","category-optical-consulting-engineering-posts","category-our-skills"],"featured_image_src":"https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO.jpg","author_info":{"display_name":"piseophotonics","author_link":"https:\/\/piseo.fr\/en\/author\/piseophotonics\/"},"featured_image_urls_v2":{"full":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO.jpg",1920,600,false],"thumbnail":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-150x150.jpg",150,150,true],"medium":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-300x94.jpg",300,94,true],"medium_large":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-768x240.jpg",696,218,true],"large":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-1024x320.jpg",696,218,true],"1536x1536":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-1536x480.jpg",1536,480,true],"2048x2048":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO.jpg",1920,600,false],"td_150x0":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-150x47.jpg",150,47,true],"td_150x0_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-300x94.jpg",300,94,true],"td_218x150":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-218x150.jpg",218,150,true],"td_218x150_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-436x300.jpg",436,300,true],"td_300x0":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-300x94.jpg",300,94,true],"td_300x0_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-600x188.jpg",600,188,true],"td_324x400":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-324x400.jpg",324,400,true],"td_324x400_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-648x600.jpg",648,600,true],"td_485x360":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-485x360.jpg",485,360,true],"td_485x360_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-970x600.jpg",970,600,true],"td_696x0":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-696x218.jpg",696,218,true],"td_696x0_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-1392x435.jpg",1392,435,true],"td_1068x0":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-1068x334.jpg",1068,334,true],"td_1068x0_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO.jpg",1920,600,false],"td_1920x0":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO.jpg",1920,600,false],"td_1920x0_retina":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO.jpg",1920,600,false],"ultp_layout_landscape_large":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-1200x600.jpg",1200,600,true],"ultp_layout_landscape":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-870x570.jpg",870,570,true],"ultp_layout_portrait":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-600x600.jpg",600,600,true],"ultp_layout_square":["https:\/\/piseo.fr\/wp-content\/uploads\/2023\/08\/lumiere-parasite-PISEO-600x600.jpg",600,600,true]},"post_excerpt_stackable_v2":"<p>The phenomena of stray light (or flare) reduce the performance of optical imaging systems. It is necessary to identify their causes in order to reduce or even eliminate them by acting on the system\u2019s physical parameters. PIS\u00c9O experts master these optical manifestations. Thanks to their knowledge of and expertise in optical simulation, they can help you understand and correct them. What is stray light? Stray light refers to unwanted and unintended light in an optical system. These light rays are generally due to surface scattering of optical and mechanical components. Stray light can also come from internal reflection between components,&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/piseo.fr\/en\/optical-consulting-engineering-posts\/\" rel=\"category tag\">Optical consulting and engineering<\/a>, <a href=\"https:\/\/piseo.fr\/en\/optical-consulting-engineering-posts\/our-skills\/\" rel=\"category tag\">Our skills<\/a>","author_info_v2":{"name":"piseophotonics","url":"https:\/\/piseo.fr\/en\/author\/piseophotonics\/"},"comments_num_v2":"0 comments","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Stray light - PIS\u00c9O<\/title>\n<meta name=\"description\" content=\"The phenomena of stray light (or flare) reduce the performance of optical imaging systems. PIS\u00c9O experts master these optical manifestations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/piseo.fr\/en\/optical-consulting-engineering-posts\/our-skills\/stray-light\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stray light - PIS\u00c9O\" \/>\n<meta property=\"og:description\" content=\"The phenomena of stray light (or flare) reduce the performance of optical imaging systems. 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