| 摘要 |
PURPOSE:To provide a method for easily and accurately identifying an optical path at the end part of the optical path. CONSTITUTION:An identification mark 39 constituted of plural reflection parts for reflecting only a specific wavelength is installed on the optical path 50, and the wavelength of the reflection light from the identification mark 39 and which is obtained when inspection light is made incident from one end of the optical path is measured so as to identify the optical path 50 based on the measured wavelength. When the inspection light is made incident from one end of the optical path 50 by a light emitting part 20, the light is reflected on each reflection part of the identification mark 39, and then, it turns back to the incident end. The combination of the reflection light wavelength and the reflectance in each reflection part is made different at every optical path 50, and then, when the wavelength and light intensity of the reflected light is measured, the optical path 50 can be identified based on the measurement result. |
