New techniques to apply an optical fiber image guide to harsh radiation environments in nuclear facilities

Atsushi Kimura; Eiji Takada; Yoneichi Hosono; Masaharu Nakazawa; Hiroyuki Takahashi; Hiroyuki Hayami

doi:10.1117/12.335761

11 January 1999 New techniques to apply an optical fiber image guide to harsh radiation environments in nuclear facilities

Atsushi Kimura, Eiji Takada, Yoneichi Hosono, Masaharu Nakazawa, Hiroyuki Takahashi, Hiroyuki Hayami

Author Affiliations +

Proceedings Volume 3538, Process Monitoring with Optical Fibers and Harsh Environment Sensors; (1999) https://doi.org/10.1117/12.335761
Event: Photonics East (ISAM, VVDC, IEMB), 1998, Boston, MA, United States

Abstract

To apply optical fiber image guide (IG) to harsh radiation environments, we have developed two new techniques. One technique is a visible type IG with a color correcting system and the other technique is an IR type IG. We irradiated the IGs utilizing a ⁶⁰Co gamma source. Measured Images with the visible type IG became dark and yellowish because of radiation induced loss. By using a color correction system, the original color of the images can be obtained. In the case of IR type IG, because of low radiation induced loss in the IR region, the degree of darkening was less than half of that for the visible type of IG. For a fixed irradiated length of 2.5m, the dose limit for using IG was estimated to be 4.6 X 10⁸ with the visible type IG and 1.2 X 10⁹ with the IR type IG. These radiation resistivities were more than 10³ times of that for usual CCD cameras. With these techniques, IG can be applied to harsh radiation environment.

Citation Download Citation

Atsushi Kimura, Eiji Takada, Yoneichi Hosono, Masaharu Nakazawa, Hiroyuki Takahashi, and Hiroyuki Hayami "New techniques to apply an optical fiber image guide to harsh radiation environments in nuclear facilities", Proc. SPIE 3538, Process Monitoring with Optical Fibers and Harsh Environment Sensors, (11 January 1999); https://doi.org/10.1117/12.335761

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