A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this paper.The hydrogen sensitive Pd/Hf film with the l...A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this paper.The hydrogen sensitive Pd/Hf film with the length of 4 mm is successfully deposited in theπ-phase-shifted grating region by the magnetron sputtering process and rotating fixture technology.Since the hydrogen sensitivity between the notch and flank wavelengths of theπ-phase-shifted grating is different due to the partial coating only on theπ-phase-shifted grating region,the relative shift between the notch and flank wavelengths is employed to characterize the hydrogen concentration in this paper.The hydrogen calibration results show that the sensor shows the good response and repeatability.At the temperature of 20 and℃the hydrogen concentration of 2%,the wavelength distance shifts of 200 nm and 500 nm Pd/Hf coatings are 12.6 pm and 33.5 pm,respectively.展开更多
随着交联聚乙烯(Cross-linked Polyethylene,XLPE)高压电缆在城市地下电网中广泛投运,其安全运行对于电网稳定越来越重要,找到切实可行的方法来监测现场运行电缆的绝缘势在必行。高频电流法是一种非侵入式的检测方法,安全可靠,针对某110...随着交联聚乙烯(Cross-linked Polyethylene,XLPE)高压电缆在城市地下电网中广泛投运,其安全运行对于电网稳定越来越重要,找到切实可行的方法来监测现场运行电缆的绝缘势在必行。高频电流法是一种非侵入式的检测方法,安全可靠,针对某110 k V高压电缆接头绝缘击穿事故,对同结构电缆头进行局部放电,发现疑似局放信号并确定了其局放源,验证了此方法的实用性;X光检测是一种可实时成像的新型检测技术,通过一起电缆主绝缘击穿事故的X光检测,表明了利用X射线数字成像技术,可实现电缆内部结构的可视化诊断,快速准确的评估电缆缺陷程度。电缆高温运行实例将两方法综合应用,进一步验证了其有效性,为XLPE高压电缆局放带电检测提供理论支持。展开更多
基金supported in part by the National Natural Science Foundation of China(Grant No.62025505)in part by the National Science Fund for Distinguished Young Scholars of China(Grant No.62061136002)in part by Deutsche Forschungsgemeinschaft(DFG),Germany(Grant No.448330062).
文摘A novel optical fiber hydrogen sensor based on theπ-phase-shifted grating and partial coated Pd/Hf composite film is proposed and experimentally demonstrated in this paper.The hydrogen sensitive Pd/Hf film with the length of 4 mm is successfully deposited in theπ-phase-shifted grating region by the magnetron sputtering process and rotating fixture technology.Since the hydrogen sensitivity between the notch and flank wavelengths of theπ-phase-shifted grating is different due to the partial coating only on theπ-phase-shifted grating region,the relative shift between the notch and flank wavelengths is employed to characterize the hydrogen concentration in this paper.The hydrogen calibration results show that the sensor shows the good response and repeatability.At the temperature of 20 and℃the hydrogen concentration of 2%,the wavelength distance shifts of 200 nm and 500 nm Pd/Hf coatings are 12.6 pm and 33.5 pm,respectively.
文摘随着交联聚乙烯(Cross-linked Polyethylene,XLPE)高压电缆在城市地下电网中广泛投运,其安全运行对于电网稳定越来越重要,找到切实可行的方法来监测现场运行电缆的绝缘势在必行。高频电流法是一种非侵入式的检测方法,安全可靠,针对某110 k V高压电缆接头绝缘击穿事故,对同结构电缆头进行局部放电,发现疑似局放信号并确定了其局放源,验证了此方法的实用性;X光检测是一种可实时成像的新型检测技术,通过一起电缆主绝缘击穿事故的X光检测,表明了利用X射线数字成像技术,可实现电缆内部结构的可视化诊断,快速准确的评估电缆缺陷程度。电缆高温运行实例将两方法综合应用,进一步验证了其有效性,为XLPE高压电缆局放带电检测提供理论支持。
