{"id":1216,"date":"2014-03-17T11:14:34","date_gmt":"2014-03-17T11:14:34","guid":{"rendered":"https:\/\/www.prophotonix.com\/?p=1216"},"modified":"2023-11-21T13:50:09","modified_gmt":"2023-11-21T13:50:09","slug":"benefits-structured-light-laser-vs-laser-line-generator","status":"publish","type":"post","link":"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/","title":{"rendered":"Benefits of Structured Light Laser vs Laser Line Generator"},"content":{"rendered":"

Structured laser light (SLL) is a technique for projecting a known pattern of pixels (singular line, horizontal lines, crosshair, grid) onto an object. Vision systems calculate the depth and surface information of objects from the deformation of the light when it strikes the object’s surface. In machine vision, singular straight lines are the most common configuration. In this post, we look at the benefits of a\u00a0Structured Light Laser<\/a>\u00a0versus a Laser Line Generator.<\/p>\n

Laser Line Generator<\/h2>\n

A laser module which utilizes a cylindrical lens, known as a laser line generator, is sufficient for the majority of applications. A cylindrical lens produces a non-uniform, Gaussian laser profile with intense center area and fading edges along the projected line. Line modules utilizing these lenses are an easy and inexpensive solution but deficient in optical performance and uniformity.<\/p>\n

\"\"
Gaussian line output from cylindrical lens.<\/figcaption><\/figure>\n

<\/h2>\n

Structured Light Laser – Powell Lens<\/h2>\n

A laser module utilizing a Powell lens, often referred to as a\u00a0structured light laser<\/a>, is preferred for applications with more exacting requirements. A Powell lens resembles a round prism with a two-dimensional aspheric element on its apex. The output line from a Powell lenses is a uniform distribution of energy. This is achieved when the laser beam hits the apex causing spherical aberrations (imperfection of the produced image) within the lens redistributing the light such that it decreases the light in the central area of the line while increasing the light intensities at the ends of the line. The output is an optically efficient, uniform line.<\/p>\n

\"\"
Uniform line output from Powell lens<\/figcaption><\/figure>\n

 <\/p>\n

Key Considerations<\/h2>\n

Beam Width<\/h3>\n

The powell lens performance is very sensitive to beam diameter. It is also wavelength dependent. To get an even distribution of energy, the apex curvature needs to be precisely optimized for a particular laser beam width.<\/p>\n

Fan Angle<\/h3>\n

The fan angle of the output beam is dependent on the refractive index of the glass and the roof angle of the Powell lens. The steeper the roof and the higher the refractive index, the wider the fan angle and the longer the line of a given projection distance. In extreme fan angles (90\u00b0 – 125\u00b0), the Powell lens is more difficult to manufacture and prone to unintended aberrations in the output beam. As a result of these manufacturing issues,\u00a0structured light laser<\/a> modules that incorporate Powell lens tend to more expensive than line generator modules but with a much better beam characteristic.<\/p>\n

\"\"
Fan Angle of Laser Line from a Structured Light Laser<\/figcaption><\/figure>\n

 <\/p>\n

Powell Lens Configuration<\/h3>\n

The Powell lens has two configurations based on lens placement relative to the incoming laser beam. Powell lens positioning directly affects depth of focus and the thickness of the laser line. To achieve a narrow incident beam orientation, a thin laser line with a small depth of focus is generated (we refer to this as AS configuration).<\/p>\n

To achieve a wide incident beam orientation, a thicker laser line with a large depth of focus is generated (we refer to this as AF configuration). This configurability along with variation on lens properties (focal length, etc) allows for a wide variation of customer laser line requirements.<\/p>\n

Conclusion<\/h2>\n

For the most part, using cylindrical lenses are sufficient for certain customer applications. However, if your application requires uniform distribution of light, a\u00a0structured light laser<\/a>\u00a0is required.<\/p>\n","protected":false},"excerpt":{"rendered":"

Structured laser light (SLL) is a technique for projecting a known pattern of pixels (singular line, horizontal lines, crosshair, grid) onto an object. Vision systems calculate the depth and surface information of objects from the deformation of the light when it strikes the object’s surface. In machine vision, singular straight lines are the most common […]<\/p>\n","protected":false},"author":4,"featured_media":10568,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[56,63,77],"tags":[],"class_list":["post-1216","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-machine-vision-lighting","category-inspection","category-structured-lights-lasers","industry-machine-vision-lighting","industry-inspection","industry-structured-light-lasers","product-category-laser-modules"],"acf":[],"yoast_head":"\nBenefits of Structured Light Laser vs Laser Line Generator<\/title>\n<meta name=\"description\" content=\"Th benefits of using Structured Light Laser vs Laser Line Generator for your application - the differences and key considerations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Benefits of Structured Light Laser vs Laser Line Generator\" \/>\n<meta property=\"og:description\" content=\"Th benefits of using Structured Light Laser vs Laser Line Generator for your application - the differences and key considerations.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/\" \/>\n<meta property=\"og:site_name\" content=\"Prophotonix\" \/>\n<meta property=\"article:published_time\" content=\"2014-03-17T11:14:34+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-21T13:50:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.prophotonix.com\/wp-content\/uploads\/2014\/03\/Benefits_of_Structured_Light_Laser_vs._Laser_Line_Generator._1jpg.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"850\" \/>\n\t<meta property=\"og:image:height\" content=\"620\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Aoife Chapman\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ProPhotonix\" \/>\n<meta name=\"twitter:site\" content=\"@ProPhotonix\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Aoife Chapman\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/\"},\"author\":{\"name\":\"Aoife Chapman\",\"@id\":\"https:\/\/www.prophotonix.com\/#\/schema\/person\/3bcbc121c7cad25444c01e5ba30cbad2\"},\"headline\":\"Benefits of Structured Light Laser vs Laser Line Generator\",\"datePublished\":\"2014-03-17T11:14:34+00:00\",\"dateModified\":\"2023-11-21T13:50:09+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/\"},\"wordCount\":583,\"publisher\":{\"@id\":\"https:\/\/www.prophotonix.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.prophotonix.com\/wp-content\/uploads\/2014\/03\/Benefits_of_Structured_Light_Laser_vs._Laser_Line_Generator._1jpg.jpg\",\"articleSection\":[\"Machine Vision Lighting\",\"Inspection\",\"Structured Light Lasers\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/\",\"url\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/\",\"name\":\"Benefits of Structured Light Laser vs Laser Line Generator\",\"isPartOf\":{\"@id\":\"https:\/\/www.prophotonix.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.prophotonix.com\/benefits-structured-light-laser-vs-laser-line-generator\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.prophotonix.com\/wp-content\/uploads\/2014\/03\/Benefits_of_Structured_Light_Laser_vs._Laser_Line_Generator._1jpg.jpg\",\"datePublished\":\"2014-03-17T11:14:34+00:00\",\"dateModified\":\"2023-11-21T13:50:09+00:00\",\"description\":\"Th benefits of using Structured Light Laser vs Laser Line Generator for your application - 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