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自适应天线阵中参考信号捕获的重要性
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作者 Rubio,JF 张耀华 《现代科技译丛(大连)》 1991年第1期48-51,31,共5页
关键词 自适应天线阵 对考信号 信号捕获
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Optical Humidity Sensor Based on Air Guided Photonic Crystal Fiber 被引量:1
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作者 M. Y. MOHD NOOR N. KHALILI +1 位作者 I. SKINNER G. D. PENG 《Photonic Sensors》 SCIE EI CAS 2012年第3期277-282,共6页
We proposed a novel relative humidity (RH) sensor based on the air guided photonic crystal fiber (AGPCF) using the direct absorption spectroscopic method in this paper. The wavelength scanning around the water vap... We proposed a novel relative humidity (RH) sensor based on the air guided photonic crystal fiber (AGPCF) using the direct absorption spectroscopic method in this paper. The wavelength scanning around the water vapor absorption peak around 1368.59nm was realized by injecting the saw-tooth modulated current to a distributed-feedback laser diode. A reference signal was used as a zero absorption baseline and to help reduce the interference from the distributed-feedback laser source and probed region. The humidity level was determined by the normalized voltage difference between the reference signal and sensor signal at the peak of water vapor absorption. We demonstrated that a length of 5-cm AGPCF with a fixed small air gap between the single mode fiber (SMF) and hollow core fiber as an opening achieved a humidity detection resolution of around 0.2%RH over the range 0 to 90%RH which did not require the use of any hygroscopic coating material. 展开更多
关键词 Air guided photonic crystal fiber humidity sensor wavelength scanning
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