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Security-device-for-detecting-defects-in-transmitting-fiber

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Security device for detecting defects in transmitting fiber

Details

Inventors: Doi, Yuzuru;
Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: McGraw; Vincent P.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas

An apertured reflection plate obliquely oriented with respect to a fiber optical axis allows light to be introduced through the aperture to a condenser lens for introduction to the fiber. Light reflected from the exit face of the fiber will come out of the entrance end face, be spread by the lens and be reflected by the outer regions of the reflection plate to a light detecting element. In response to an abnormal detection signal, the laser can be disabled.

DETAILED DESCRIPTION In view of the foregoing, an object of this invention is to provide a damage detecting device which can immediately detect the occurrence of damage in transmitting fibers.
Briefly, this is achieved according to the present invention by a detecting device which measures the amount of light reflected back to the entrance of the optical fiber from the end face thereof.
If the end face is damaged, the reflected light will decrease, and the laser beam can be blocked by an automatically operated shutter.

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