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  • reflectometer An instrument for measuring reflectance.
  • optical time-domain reflectometry (OTDR) A method for characterizing a fiber wherein an optical pulse is transmitted through the fiber, and the resulting light scattered and reflected to the input is measured (by an optical time-domain reflectometer, or OTDR) as a function of time.  
  • optical continuous wave reflectometer (OCWR) An instrument used to measure backscatter as well as optical return loss and reflectance within an optical fiber system by measuring the reflected light when a continuous wave is transmitted through an optical fiber.
  • photoelectric reflectometer A photoelectric photometer used to measure the reflectance of a surface.
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