<\/div>\n
Operating principle<\/h2>
Industrial color sensors use a stabilized light source (white or RGB LEDs) to illuminate the surface of the product; the reflected light is picked up by photodetectors fitted with colored optical filters (red, green, blue – tristimulus filters according to CIE) that measure the light intensity in each of the three spectral bands. The internal algorithms convert the three values into standard color coordinates (CIE L*a*b* or L*c*h*) or into RGB intensity values for each channel. For advanced applications, multispectral sensors with more than 3 channels are used to improve discrimination between similar colors (metamerism). <\/p>
Operating modes<\/h2>
Industrial color sensors work in several modes: “teach-in” mode (the operator shows the sensor a reference sample; the sensor stores the values of the sample as “good” and flags as “reject” any product that deviates beyond a configurable tolerance); “match” mode (the instrument compares the measured color with a library of stored colors and identifies the closest one); “\u0394E” mode (calculation of Delta E – the color difference perceived by the human eye according to the CIE76, CIE94 and CIE2000 formulas – above a \u0394E of about 2-3 the color is perceived as different). Configurable GO\/NOGO thresholds trigger alarms and automatic rejection. <\/p>
Types<\/h2>
The main types are: spot sensors (with illumination and reception concentrated on a small spot of 1-20 mm, for precise measurements at a specific point); fiber-optic sensors (with a miniaturized measuring probe connected to the electronics by an optical fiber – for applications in confined or hard-to-reach spaces); line sensors (with a field of view extended along a line across the product, for the inspection of continuous webs); and full color vision systems (with RGB cameras and complete software analysis – for complex inspections of products with graphics and colored patterns).<\/p>
Industrial applications<\/h2>
The applications are wide-ranging: the automotive industry (color control of bodywork and interior parts); the packaging industry (color control of labels, printed board and sleeves); the food industry (quality control of products by color – for example meat, fish, baked goods, fruit and wine); the textile industry (control of colored yarn, fabrics and dyed threads); the pharmaceutical industry (identification of tablets and capsules by color); plastics (color control of profiles and molded parts); the wood industry (checking the color of the finish on furniture); and the automatic identification of components on an assembly line.<\/p>
Integration<\/h2>
Industrial color sensors are integrated into line control systems through: digital outputs (PNP\/NPN) to actuate devices (ejectors, markers); analog outputs for display on an HMI; and digital interfaces (RS-485, Profinet, EtherCAT, IO-Link, OPC UA) for full integration with PLC and MES. Parameter setting (teach-in, thresholds, tolerances) is carried out locally with dedicated keys or from a PC using the manufacturer’s software. The sensors are generally rugged, with an IP65-IP67 protection rating, and need no integrated batteries (industrial 24 V DC supply). <\/p>
Selection criteria<\/h2>
The choice of color sensor takes into account: the range of colors to be discriminated (some sensors are optimized for certain colors); the color resolution required (discriminating similar colors calls for higher sensitivity); the working distance and the spot size; the speed of the product (for synchronization with the line trigger); the interfaces for integration with the PLC; the operating conditions (dust, vibration, temperature, humidity); and the ease of parameter setting and product changeover (for production runs with frequent code changes).<\/p>","protected":false},"excerpt":{"rendered":"
CROMLAVIEW and similar color sensors for automatic color inspection and in-line quality control.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19505,"menu_order":3,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-20653","page","type-page","status-publish","hentry"],"yoast_head":"\n
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