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Through-beam and retro-reflective types use the size of an opaque body with a larger diameter as a standard object based on the diagonal length of the optical structure. The general through-beam type uses the diagonal length of the emitter and receiver as the standard detection object length. The retroreflective type uses the diagonal length of the reflector as the standard to detect the diameter of the object. The diffuse reflection type photoelectric sensor uses white paper as a standard detection object based on the diameter of the projected light beam. <img src=/uploadfile/ueditor/image/202302/1675994225c80abf.jpg" title="FS306" alt="FS306"/>
