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空芯光纤气体传感气室的优化设计 被引量:9
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作者 周佳琦 陆维佳 +1 位作者 孙帮山 石艺尉 《光学学报》 EI CAS CSCD 北大核心 2012年第2期281-286,共6页
波导式光学吸收腔在气体和液体浓度测量等领域有广泛的应用前景。空芯光纤作为光学吸收腔具有很多优点。空芯光纤的参数与传感系统的性能有直接的关系。提出了一种能同时考虑空芯光纤的损耗和系统信噪比的数学模型。从理论上分析了光纤... 波导式光学吸收腔在气体和液体浓度测量等领域有广泛的应用前景。空芯光纤作为光学吸收腔具有很多优点。空芯光纤的参数与传感系统的性能有直接的关系。提出了一种能同时考虑空芯光纤的损耗和系统信噪比的数学模型。从理论上分析了光纤的长度、内径、目标气体浓度以及输入光场能量分布等因素对传感系统信号输出强度和灵敏度的影响。给出的最优化参数为提高系统灵敏度和补偿系统误差提供了参考。 展开更多
关键词 光学器件 空芯光纤 优化设计 吸收光谱传感 信噪比
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波导式吸收腔的有效光程率研究 被引量:3
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作者 周佳琦 石艺尉 《光学学报》 EI CAS CSCD 北大核心 2011年第2期236-241,共6页
波导式光学吸收腔在气体和液体浓度测量等领域有广泛的应用前景。吸收腔的有效光程与系统的灵敏度有直接的关系。提出了波导式吸收腔有效光程率的数学模型。从理论上分析了波导的内壁镀膜折射率和厚度、波导内径和弯曲以及输入光场能量... 波导式光学吸收腔在气体和液体浓度测量等领域有广泛的应用前景。吸收腔的有效光程与系统的灵敏度有直接的关系。提出了波导式吸收腔有效光程率的数学模型。从理论上分析了波导的内壁镀膜折射率和厚度、波导内径和弯曲以及输入光场能量分布等因素对波导式吸收腔有效光程率的影响。对提高系统灵敏度和测试系统的误差补偿提供了重要参考。计算结果与已经发表的实验数据有很好的一致性。 展开更多
关键词 光学器件 光波导 有效光程率 数学建模 吸收光谱传感
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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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CO and CO_2 dual-gas detection based on mid-infrared wideband absorption spectroscopy 被引量:2
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作者 董明 钟国强 +2 位作者 苗澍茁 郑传涛 王一丁 《Optoelectronics Letters》 EI 2018年第2期119-123,共5页
A dual-gas sensor system is developed for CO and CO_2 detection using a single broadband light source, pyroelectric detectors and time-division multiplexing(TDM) technique. A stepper motor based rotating system and a ... A dual-gas sensor system is developed for CO and CO_2 detection using a single broadband light source, pyroelectric detectors and time-division multiplexing(TDM) technique. A stepper motor based rotating system and a single-reflection spherical optical mirror are designed and adopted for realizing and enhancing dual-gas detection. Detailed measurements under static detection mode(without rotation) and dynamic mode(with rotation) are performed to study the performance of the sensor system for the two gas samples. The detection period is 7.9 s in one round of detection by scanning the two detectors. Based on an Allan deviation analysis, the 1σ detection limits under static operation are 3.0 parts per million(ppm) in volume and 2.6 ppm for CO and CO_2, respectively, and those under dynamic operation are 9.4 ppm and 10.8 ppm for CO and CO_2, respectively. The reported sensor has potential applications in various fields requiring CO and CO_2 detection such as in the coal mine. 展开更多
关键词 CO and CO_2 dual-gas detection based on mid-infrared wideband absorption spectroscopy
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Spectral Absorption Gas Sensor Based on Anti-Resonant Reflecting Optical Waveguide 被引量:1
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作者 Haihu YU Yu ZHENG +2 位作者 Huiyong GUO Beibei CAO Huifeng WEI 《Photonic Sensors》 SCIE EI CAS 2014年第2期128-131,共4页
An air-silica microstructure optical fiber based on the anti-resonant reflecting optical waveguide (ARROW) principle was used to develop a spectral absorption gas sensor. The ARROW fiber has an air core and an air c... An air-silica microstructure optical fiber based on the anti-resonant reflecting optical waveguide (ARROW) principle was used to develop a spectral absorption gas sensor. The ARROW fiber has an air core and an air cladding layer. An ARROW fiber with a length of 725mm was used to construct a sensing system to detect acetylene gas. The gas was injected into the fiber from one end of the fiber. The transmission spectra were collected using an optical spectrum analyzer. The results indicate that the system can detect the gas of different concentrations and has the good system linearity. The response time of the system is about 200 s. 展开更多
关键词 Microstructure optical fiber ARROW fiber gas sensor spectrum absorption acetylene gas
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