Gamma radiation tests of potential optical fiber candidates for fibroscopy

IEEE Transactions on Nuclear Science

Volumn 43, Issue 6 PART 1, 1996, Pages 3027-3031

  Deparis, O ^a   Megret P ^a   Decreton M ^b   Blondel, M ^b  

^a BELGIAN NUCLEAR RESEARCH CENTRE   (Belgium)

^b FACULTÉ POLYTECHNIQUE DE MONS   (Belgium)

Author keywords

[No Author keywords available]

Indexed keywords

CLADDING (COATING); ELECTROMAGNETIC WAVE ATTENUATION; GAMMA RAYS; GRADIENT INDEX OPTICS; IRRADIATION; RADIATION EFFECTS; SILICA;

FIBROSCOPY; MULTIMODE STEP INDEX (MMSI); NON BRIDGING OXYGEN HOLE CENTERS (NBOHC);

OPTICAL FIBERS;

EID: 0030375855     PISSN: 00189499     EISSN: None     Source Type: Journal    
DOI: 10.1109/23.556901     Document Type: Article

References (11)

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2. E. W. Taylor, E. J. Friebele, H. Henschel, R. H. West, J. A. Krinsky, C. E. Barnes, "Interlaboratory Comparison of Radiation-Induced Attenuation in Optical Fibers. Part II : Steady-State Exposures", J. Lightwave Tech. , vol. 8, (n° 6), pp. 967-976, 1990.
3. O. Deparis, P. Mégret, M. Decréton, M. Blondel, "The Radiation-Induced Absorption Band at 600 run and its Impact in Fibroscopy", in Proc. RADECS'95, pp. 507511, 1995.
4. D. L. Griscom, "Radiation Hardening of Pure-SilicaCore Optical Fibers by Ultra-High-Dose y-Ray Preirradiation", in Proc. RADECS'95, pp. 498-502, 1995.
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6. K. Nagasawa, M. Tanabe, K. Yahagi, "Gamma-RayInduced Absorption Bands in Pure-Silica-Core Fibers", Japanese. J. Appl. Phys. , vol. 23 , (n°12), pp. 16081613, 1984.
7. Standard Guide E 1614-94, American Society for Testing and Materials, 1994.
8. D. L. Griscom, "Fast-neutron radiation effects in a silica-core optical fiber studied by a CCD-camera spectrometer ", J. Appl. Optics, vol. 33, (n°6), pp. 1022 -1028, 1994.
9. S. Munekuni,T. Yamanaka, Y. Shimogaichi, R. Thomon, Y. Ohki, K. Nagasawa, Y. Hama, "Various type of non bridging oxygen hole center in high-purity glass ", J. Appl. Phys. , vol. 68, (n°3), pp. 1212-1217, 1990.
10. O. Departs, P. Mégret, M. Decréton, M. Blondel, "Evolution of the 660 nm Radiation-Induced Band in a Low-OH Low-Cl Optical Fibre"; IEE Electronics Letters, vol. 32, (n°15), pp. 1392-93, July 1996.
11. This explanation has been confirmed by the following experiment. We performed thermal tests (heating from room temperature to 100°C) on fiber samples similar to those discussed in this study but having never been irradiated. These samples were wound on aluminium spools of 54 mm diameter. We measured significant temperature-induced transmission losses in the samples having a polymide or aluminium coating and a thin cladding (1. 1. or 1. 2 cladding to core diameter ratio respectively). We observed negligible temperatureinduced losses in fiber samples having a thick cladding (1. 4 cladding to core diameter ratio). The losses increased with increasing wavelength and were very high in the infrared. The amount of losses depended also on the coating material. We attribute this phenomenon (also observed in the present study) to the dependence of microbending losses on temperature. The small diameter of the fiber coils greatly enhances this phenomenon.