{"id":9622,"date":"2026-06-21T07:30:00","date_gmt":"2026-06-21T05:30:00","guid":{"rendered":"https:\/\/rodervision.com\/non-classe\/vision-lighting-for-glass-and-transparent-material-inspection\/"},"modified":"2026-05-25T17:13:32","modified_gmt":"2026-05-25T15:13:32","slug":"vision-lighting-for-glass-and-transparent-material-inspection","status":"publish","type":"post","link":"https:\/\/rodervision.com\/fr\/applications\/vision-lighting-for-glass-and-transparent-material-inspection\/","title":{"rendered":"\u00c9clairage de vision pour l’inspection du verre et des mat\u00e9riaux transparents"},"content":{"rendered":"\n
\n\n

In the realm of industrial automation, glass and transparent materials represent the \u00ab\u00a0final frontier\u00a0\u00bb of machine vision. Unlike opaque objects, transparent substrates do not simply reflect light; they transmit, refract, and polarize it. Achieving a 100% quality hit rate requires more than just a high-resolution camera\u2014it requires a sophisticated understanding of Vision Lighting for Glass and Transparent Material Inspection<\/strong>.<\/p>\n\n

Des flacons pharmaceutiques aux pare-brise automobiles, la bonne strat\u00e9gie d’\u00e9clairage fait la diff\u00e9rence entre d\u00e9tecter un d\u00e9faut critique et un produit non conforme livr\u00e9 au client.<\/p>\n\n

<\/div>\n\n
\"Technical<\/span>
\n

Vous souhaitez obtenir de l’aide pour choisir le bon produit ?<\/strong><\/p>\n\n\n\n

\n
Parlez \u00e0 un ing\u00e9nieur<\/a><\/div>\n<\/div>\n<\/div><\/div>\n\n
<\/div>\n\n

Les d\u00e9fis sp\u00e9cifiques de l’inspection du verre et des mat\u00e9riaux transparents<\/h3>\n\n

La difficult\u00e9 principale de l’inspection du verre tient \u00e0 ses propri\u00e9t\u00e9s optiques. Le verre est par nature con\u00e7u pour laisser passer la lumi\u00e8re, ce qui rend les techniques d’\u00e9clairage frontal standard quasi inutiles.<\/p>\n\n

Les ing\u00e9nieurs sont confront\u00e9s \u00e0 trois obstacles principaux :<\/p>\n\n

    \n
  1. R\u00e9flexion sp\u00e9culaire :<\/strong> les surfaces tr\u00e8s polies cr\u00e9ent des \u00ab\u00a0hotspots\u00a0\u00bb qui aveuglent les capteurs de cam\u00e9ra.<\/li>\n\n\n\n
  2. Faible contraste :<\/strong> les d\u00e9fauts tels que les bulles transparentes ou les rayures ont la m\u00eame couleur que l’arri\u00e8re-plan.<\/li>\n\n\n\n
  3. R\u00e9fraction :<\/strong> la nature courb\u00e9e de nombreux objets en verre (comme les bouteilles) d\u00e9vie la lumi\u00e8re, cr\u00e9ant des distorsions optiques qui peuvent \u00eatre confondues avec des d\u00e9fauts.<\/li>\n<\/ol>\n\n

    Mode en transmission : r\u00e9tro\u00e9clairage pour la d\u00e9tection de d\u00e9fauts internes<\/h3>\n\n

    The most common and effective setup for transparent materials is Transmission Mode<\/strong>. By placing a uniform LED backlight, such as the RODER BL3 Series<\/strong>, directly behind the object, the system operates on the principle of light occlusion.<\/p>\n\n

    When the light passes through the glass, any internal impurity\u2014such as a stone, a metallic inclusion, or a large bubble\u2014blocks or scatters the light. This creates a high-contrast dark spot against a bright white field, allowing the vision software to trigger a \u00ab\u00a0Fail\u00a0\u00bb result instantly. This is the gold standard for verifying liquid fill levels and checking for contaminants in the food and beverage industry.<\/p>\n\n

    Mode en r\u00e9flexion : d\u00e9tection des rev\u00eatements de surface et des rayures<\/h3>\n\n

    While transmission looks through<\/em> the glass, Reflection Mode<\/strong> looks at<\/em> the surface. This technique is essential for inspecting specialized coatings (like anti-reflective or hydrophobic layers) and detecting fine surface scratches that do not penetrate the thickness of the material.<\/p>\n\n

    By angling the light source at a specific incidence, the camera captures the light bouncing off the surface. Any disruption in the coating or a physical scratch will alter the reflection pattern, making the defect visible as a bright glint or a dark void.<\/p>\n\n

    H3 : \u00e9clairage darkfield pour inclusions et microbulles<\/h3>\n\n

    When defects are smaller than 0.1mm, standard backlighting may \u00ab\u00a0wash out\u00a0\u00bb the flaw. This is where Darkfield Illumination<\/strong> shines. In a darkfield setup, the light source is positioned at a low angle, so the light does not directly enter the camera lens.<\/p>\n\n

    In a perfect piece of glass, the camera sees a black image. however, if a micro-bubble or a tiny inclusion is present, it scatters the light into the lens. The result is a brilliant, glowing defect against a pitch-black background. This method is unparalleled for high-precision optical component inspection.<\/p>\n\n

    H3 : techniques d’\u00e9clairage lat\u00e9ral pour panneaux de verre plat<\/h3>\n\n

    For large, flat glass panels, Edge Lighting<\/strong> (or Side-lighting) is a highly efficient technique. Light is injected into the thickness of the glass from the sides. Due to Total Internal Reflection (TIR)<\/strong>, the light remains trapped within the \u00ab\u00a0sandwich\u00a0\u00bb of the glass.<\/p>\n\n

    If there is a crack, a chip, or a laser-etched mark on the surface, the TIR is \u00ab\u00a0frustrated,\u00a0\u00bb and the light escapes at that specific point. This causes the defect to illuminate brightly, making it easy for the vision system to identify structural cracks that could lead to catastrophic breakage.<\/p>\n\n

    H3 : SWIR pour l’inspection en transmission dans le proche infrarouge<\/h3>\n\n

    Sometimes, the most dangerous defects are invisible to the human eye and standard CMOS sensors. Short-Wave Infrared (SWIR)<\/strong> lighting and imaging allow for inspection in the 900nm to 1700nm range.<\/p>\n\n

    Le SWIR est particuli\u00e8rement utile pour :<\/p>\n\n