共查询到14条相似文献,搜索用时 660 毫秒
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针对深井温度变化小,提出了一种可用于深井温度测量的高灵敏度光纤温度传感器。两根陶瓷插芯从铝管的两端插入构成外腔式光纤法珀干涉仪(EFPI)结构,用螺钉固定插芯,再用高强度的环氧树脂密封该结构,达到防水防尘效果。金属铝和陶瓷插芯具有不同的热膨胀系数,温度的变化将引起EFPI腔长变化,采用高灵敏度光纤白光干涉测量技术,就可以通过测量EFPI腔长获得被测温度。分别在固定温度和不同温度下,对腔长为146.5μm的EFPI光纤温度传感器进行了连续测量。测量结果表明,高灵敏度EFPI光纤温度传感器的腔长-温度灵敏度为260nm/℃,温度测量分辨率为0.002℃。 相似文献
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提出了一种在高温环境下同时测量温度和气压的光子晶体光纤温度压力传感器.在普通单模光纤和光子晶体光纤之间熔接一段空心光纤构成干涉结构.空心光纤段构成非本征法布里-珀罗干涉仪,利用光子晶体光纤的微孔与外界相通,通过气体折射率变化来测量环境中的气压变化;光子晶体光纤段构成本征法布里-珀罗干涉仪,利用热膨胀效应和热光效应来测量环境中的温度.传感器的解调通过自制的白光干涉解调仪实现,实验通过测量腔长得到被测环境的温度和气压.在不同温度和气压环境下,对腔长分别为306μm和1535μm的温度压力光纤传感器进行连续测量.实验结果表明,传感器能够在28~800℃的温度下和0~10 MPa的气压下稳定工作,测量范围内温度灵敏度可达17.4 nm/℃,压力灵敏度随温度增加而降低,在28℃时可达1460.5 nm/MPa. 相似文献
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报道了一种基于飞秒激光加工的微纳高温振动传感器。通过熔接形成单模光纤-空芯光纤-单模光纤的结构,利用单模光纤和空芯光纤在熔接面形成的菲涅尔反射,构成外腔式法布里-珀罗干涉仪(EFPI)。用飞秒激光烧蚀空芯光纤,形成悬臂梁结构。末端的单模光纤作为质量块,在受到振动时带动悬臂梁振动,使悬臂梁产生微弯,进而使EFPI腔长发生变化。实验结果表明,传感器的工作区域为20~300Hz,在100Hz时,0~3.01g范围内测得加速度分辨率为5×10-4 g,加速度响应灵敏度为129.6nm/g。传感器受温度影响小,腔长的温度交叉响应仅为0.225nm/℃,传感器可耐950℃高温冲击。 相似文献
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用157 nm激光制作的光子晶体光纤法布里-珀罗传感器 总被引:6,自引:2,他引:4
157nm准分子激光用于微加工具有单光子能量高,峰值功率高,材料吸收系数高,分辨率高等优点。利用157nm激光微加工的方法,在光子晶体光纤上融切出微小矩形孔,从而构成腔长为45.6μm的微光纤法布里-珀罗干涉腔,得到的干涉条纹平滑,衬比度约为26dB,并从激光与石英材料的相互作用上分析了形成较好干涉条纹的原因。把这种微腔应用于应变测量,在550μm范围内,腔长增量相对于应变的灵敏度为0.32nm/μm,线形度达0.9994。实验证明该微腔对温度不敏感,800℃范围内腔长变化仅20nm。157nm准分子激光加工光纤法布里-珀罗腔方法简单,一次成型,具有较高的加工效率和精度,有望实现光纤法布里-珀罗腔的规模化批量制造,具有较好的应用前景。 相似文献
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测量光纤外腔Fabry-Perot干涉仪的白光干涉术 总被引:5,自引:4,他引:1
提出了一种基于白光干涉术测量低锐度光纤外腔Fabry Perot干涉仪(EFPI)的方法用宽带光源注入F P腔,在接收端用一高锐度的可调谐光纤F P滤波器对EFPI的反射光谱进行扫描,获得了周期性变化的光谱输出为了测量出EFPI的腔长,对光谱信号进行傅里叶变换,得到光谱的周期,由此求出EFPI的绝对腔长证明了用低锐度EFPI的测量准确度由腔长决定F P腔越长,测量准确度越高在腔长分别是200 μm,400 μm和600 μm时,测量的腔长与实际腔长相同. 相似文献
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基于光子晶体光纤法布里-珀罗干涉仪的温度自补偿折射率计 总被引:2,自引:0,他引:2
采用手动熔接实芯光子晶体光纤和普通单模光纤制作本征法布里-珀罗(Fabry-P6rot,F-P)干涉传感器的方法,提出了一种可实现温度自补偿的高灵敏度折射率计.理论与实验表明,新型F-P干涉传感器的对比度不受环境温度影响只随着外界折射率的变化而变化,当外界折射率在1.32~1.44范围内变化时,其折射率灵敏度约为4.59/RIU,分辨率约为2×10-5.此外,该传感器的腔长具有较高的温度灵敏度,在20~100℃范围内,其温度灵敏度为18.72 nm/℃.因此,可以通过同时监测该传感器对比度和腔长的变化就可以实现折射率和温度的同时测量,在实际工业应用中具有广泛的应用前景. 相似文献
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A micro Fabry-Perot interferometer(M-FPI) is constructed by splicing a short section of polarizationmaintaining photonic crystal fiber(PM-PCF) to an end-cleaved single-mode fiber with controllable offset. Due to the high effective optical path difference induced by the solid core of the PCF,the M-FPI has an ultrasmall cavity of approximately 110μm.The temperature sensitivity within a range from 33℃to approximately 600℃is measured to be 13.8 pm/℃,which shows good agreement with the theoretical result.This proposed sensor has the advantages of ultracompact size and high stability.Therefore,it is suitable for various space-limited sensing applications in harsh environments. 相似文献
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Pressure and temperature are two important parameters in reservoir engineering. The fiber optic sensors can be used for permanent downhole monitoring. In this paper, we propose an extrinsic fiber Fabry-Perot interferometer (EFPI) sensor for pressure measurement with low sensitivity variation. The pressure sensitivity of EFPI sensor and of the fiber Bragg grating (FBG) sensors have been measured. The experimental pressure sensitivity for EFPI and FBG sensors are measured to be 2.75 × 10−8 1/kPa and 1.52 × 10−8 1/kPa, respectively. The temperature cross-sensitivity problem of the EFPI sensor has been solved by a new technique. The temperature sensitivity of EFPI sensor has been decreased to 1.2 × 10−6/°C, while the temperature sensitivity of non-compensated EFPI sensor has been measured to be 16.4 × 10−6/°C. The results show that the EFPI sensor has a higher pressure sensitivity and good capability to decrease temperature sensitivity in comparison to FBG sensor. 相似文献
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All-solid silica-based photonic crystal fibers 总被引:1,自引:0,他引:1
Ming-Yang Chen 《Optics Communications》2006,266(1):151-158
An index-guiding all-solid photonic crystal fiber (PCF) composed entirely of silica material is proposed in this paper. The core of this optical fiber is composed of pure silica, and the cladding consists of doped silica rod in the background of pure silica. The dependence of confinement loss on the diameter of the doped rods, the number of doped-rod rings, and the doping level is investigated numerically. In addition, the proposed fiber possesses a shorter cutoff wavelength as compared with the air/silica PCF, which is directly confirmed by the V parameter, and explained based on a scalar approximation method. Furthermore, the bending loss for the fiber is predicted. A low-loss single-mode all-solid silica-based PCF with a large-mode-area is possible by the appropriate selection of configuration parameters. 相似文献