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What are the advantages of through beam/diffuse and reflected /retro reflected?

April 26, 2017advantages beam Diffuse reflected retro

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What are the advantages of through beam/diffuse and reflected /retro reflected?

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All sensors listed detect the presence and absence of an object. Through beam has a longer detection range. Diffuse detects opaque and transparent objects with a separate receiver. Retro reflected sensors detect opaque objects and ignore unwanted diffused reflected light.