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Optical rare-earth doped fiber long period grating based ionizing radiation dose sensor device
Optical rare-earth doped fiber long period grating based ionizing radiation dose sensor device
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机译:基于光学稀土掺杂光纤长周期光栅的电离辐射剂量传感器装置
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摘要
This invention relates to a sensor device consisting of long period gratings made of rare-earth doped double clad fiber, which is written by CO2 laser irradiation while the fiber is held static, for gamma dose measurement in the range of 150 Gy-2.5 kGy, extendable to 20 kGy, which measurements are real-time and can be from remote locations. The sensor device has high wavelength dip shift sensitivity of at least 2.8 nm/kGy, and its radiation-induced changes are near permanent. The gratings demonstrate negligible temperature sensitivity and the shifts recorded show negligible annealing at room temperature.
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