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首页> 外文会议>2014 Third Mediterranean Photonics Conference >On-line tests of an optical fiber long-period grating subjected to gamma irradiation
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On-line tests of an optical fiber long-period grating subjected to gamma irradiation

机译：经受伽马射线辐照的光纤长周期光栅的在线测试

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The paper reports the outcomes of the tests we conducted as on-line measurements for the evaluation of an optical fiber long period grating (LPG) produced, by fusion technique, in F-doped radiation hardened optical fiber subjected to gamma irradiation. The dosimetry was performed with an Alanine-EPR dosimetry system and the maximum total irradiation dose reached was (45 +/− 0.8)kGy. Before the irradiation the temperature sensitivity of the LPG was 27.8pm/°C, while the value of this parameter post irradiation was found to be 29.3pm/°C. The spectral characteristics of the grating were measured (i) in the laboratory with an ANDO AQ6317C optical spectrum analyzer and (ii) on-line, for the first time, with a LUNA OBR 4600 backscatter reflectometer, operating in the frequency acquisition mode. Such on-line measurement enables the study of recovery effects during the irradiation. The central wavelength of the LPG shifted under gamma irradiation by 16pm/kGy (for a total dose of 45kGy). At room temperature the recovery of the irradiation induced shift of the wavelength dip was almost complete in about 120h, at a rate of 6.7pm/h. Post irradiation heating of the sensor produced the reversing of the recovery effect.
机译：该论文报告了我们的在线测试结果，以评估通过融合技术在经过γ射线辐照的掺F辐射硬化光纤中产生的光纤长周期光栅（LPG），该测试是在线测量的结果。用丙氨酸-EPR剂量测定系统进行剂量测定，所达到的最大总照射剂量为（45 +/- 0.8）kGy。在辐照之前，LPG的温度敏感性为27.8pm /°C，而辐照后该参数的值为29.3pm /°C。 （i）在实验室中使用ANDO AQ6317C光谱分析仪测量光栅的光谱特性，（ii）首次使用以频率采集模式运行的LUNA OBR 4600背向散射仪在线测量。这种在线测量使得能够研究照射期间的恢复效果。 LPG的中心波长在伽马射线照射下偏移了16 pm/kGy（总剂量为45kGy）。在室温下，辐照引起的波长倾角偏移的恢复在大约120小时内以6.7pm / h的速度几乎完成。传感器的辐照后加热导致恢复效果的逆转。

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