Optical detection unit and oil price certificate optical detection method of oil price certificate identification device

摘要

An apparatus and method for detecting an oil price certificate for a certificate of oil value identification is provided. The light is radiated from the light emitting element over a first portion of the vapor deposition on the first surface while the deed is being transferred, such that a portion of the emitted light is transmitted through the deodorant from the first surface to the second surface. The light transmitted to the second surface through the deed is guided over the second portion of the deed on the second surface by the light emitting element, a portion of the light guided back from the second portion back to the first portion, Lt; / RTI A portion of the transmitted light back to the first surface is absorbed by the light absorbing element to be converted into an optical data pattern for analysis. The light-emitting-light-absorbing unit is used to locate the light-emitting and light-absorbing elements so that the unit also absorbs the light emitted by itself and reflected back from the deck.