{"id":18306,"date":"2026-06-27T14:48:57","date_gmt":"2026-06-27T12:48:57","guid":{"rendered":"https:\/\/roder.it\/products\/optical-encoder-speed-meters\/"},"modified":"2026-09-20T14:27:34","modified_gmt":"2026-09-20T12:27:34","slug":"optical-encoder-speed-meters","status":"publish","type":"page","link":"https:\/\/roder.it\/en\/products\/optical-encoder-speed-meters\/","title":{"rendered":"Optical encoder speed meters"},"content":{"rendered":"\n
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Non-contact optical speed meters and encoders for the precise measurement of speed and length in continuous industrial processes.<\/h3>\n\n\n\n
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Optical encoder speed meters measure the speed and length<\/strong> of moving materials with no mechanical contact at all, eliminating the slip and wear typical of measuring wheels. RODER distributes the ASTech<\/strong> range of optical speed meters, available in two complementary families \u2014 VLM60<\/strong> and VLM500<\/strong> \u2014 covering the whole spectrum of speed and accuracy required by industry. <\/p>\n<\/div>\n<\/div>\n<\/div>\n\n

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What is an optical encoder speed meter<\/h2>\n\n

An optical encoder speed meter is an instrument that determines the speed<\/strong> and, by integration, the length<\/strong> of a moving object by analyzing its surface optically. A white-light LED source illuminates the material; the reflected light, modulated by the surface structure, is picked up by an optoelectronic sensor. Since there is no physical contact, the measurement is not subject to slip, wear or maintenance of mechanical parts. <\/p>\n\n

Compared with wheel encoders, optical measurement stays accurate even on delicate, hot, wet or high-speed materials, and leaves no marks on the surface. The absence of harmful LASER light makes these instruments suitable for in-line use without special optical safety requirements. <\/p>\n\n

Two measuring technologies: spatial filter and correlation<\/h2>\n\n

ASTech optical speed meters use two measuring principles, chosen according to the speed range and the accuracy required:<\/p>\n\n