| 摘要 |
PURPOSE:To detect the emission output of an optical fiber for transmission of IR rays and to measure light losses with high accuracy in said optical fiber by using an IR detector having plural pyroelectric type IR sensors. CONSTITUTION:After the IR light from a light source 11 is intermitted by a light chopper 21, said light is made incident to the incident end of an optical fiber 14 wound on a drum of a specified diameter and is further put into an IR detector 15 from the exit end thereof. The many pyrolelectric IR sensors 16 provided on the inside surface of the housing 151 of the detector 15 detect IR light as a change in temp. The light divided by a half mirror 13 is monitored of the fluctuations in the output thereof by a power monitor 20, and is connected together with the outputs of the sensors 16 to a recorder 19. Now, the fiber 14 is cut by each specified length and the output from a lock-in amplifier 18 is read at each cutting. Since there are many sensors in the hermetically closed housing, all of the IR light are detected with good efficiency and the light losses of the optical fibers are determined accurately. |
