排序方式: 共有52条查询结果,搜索用时 15 毫秒
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提出一种干涉式全光纤传感器,能够同时实现对折射率和轴向拉力或温度进行双参数测量。传感器由一个微腔和一个纤芯失配衰减器组成。其中微腔结构是由飞秒激光加工光纤纤芯形成,直径和深度分别是6μm和2.5μm。该干涉式传感器可以获得20dB的高品质干涉对比度。传感器透射谱波长为1496.68nm和1533.18nm的两个衰减峰对应的折射率灵敏度分别为-29.91nm/RIU和-16.72nm/RIU,拉力灵敏度分别为-1.55pm/με和-0.31pm/με。实验结果表明,传感器通过灵敏度矩阵可以同时测量折射率和轴向拉力或温度两个参数。 相似文献
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The absorption and emission spectra of the YVO4 single crystal co-doped with 1 at.% Nd^3+ and 1 at.% Yb^3+ are investigated. The efficient Nd^3+ → Yb^3+ energy transfer and the back transfer (Yb^3+ → Nd^3+) are observed at room temperature. The fluorescence lifetime of the 4F3/2 level of Nd^3+ in Nd,Yb:YVO4 is measured under 808 nm laser light excitation. The efficiency of Nd^3+ → Yb^3+ energy transfer in YVO4 is determined to be about 34%. 相似文献
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在pH 4.8 的乙酸盐缓冲溶液中, 邻苯二胺(OPD)形成粒径约380 nm的微粒, 在392, 420, 445, 484和507 nm处有5个较强的Rayleigh散射峰. 辣根过氧化酶(HRP)催化H2O2氧化邻苯二胺生成黄色的2,3-二氨基吩嗪产物, 反应体系在420, 445和484 nm处的Rayleigh散射光信号显著减弱. 在最佳条件下, HRP浓度在8.3×10-12~4.17×10-10 g/mL范围内均与445和484 nm处的Rayleigh散射强度的降低值呈线性关系, 其回归方程、相关系数、检出限(3σ)分别为ΔI445 nm=2.23c+11, ΔI484 nm=1.47c+4.8; 0.9982, 0.9919; 3.6×10-12 g/mL HRP和5.4×10-12 g/mL HRP. 该法用于辣根过氧化酶(HRP)的测定, 结果满意. 相似文献
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氰戊菊酯的免疫共振散射光谱分析 总被引:2,自引:1,他引:1
在pH 7.2 Na2HP04一NaH2PO4缓冲溶液及聚乙二醇-6000存在下,氰戊菊酯(Fen)与兔抗氰戊菊酯抗体(Fen-Ab)发生免疫反应,形成具有一定疏水性的免疫复合物微粒,在350,390,420,440,480 BE产生5个共振散射峰,其中390 nm处的共振散射峰最强.研究了pH、聚乙二醇-6000、Fen-Ab浓度、免疫反应温度和时间对测定Fen的影响.在最佳条件下,氰戊菊酯(Fen)浓度c在O.20-.40μg·ml-1范围内与390 nm处的散射强度△Irs呈线性,回归方程、相关系数、检测限分别为△IRs=23.05 c-1.39,0.997 8,0.07 Pg·mL-1 Fen.干扰试验结果表明,该法具有较好的选择性.该法用于废水中Fen分析,回收率在92.91%~101.25%之间,相对标准偏差在1.71%~4.80%之间. 相似文献
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A fiber inline interferometric refractive index (RI) sensor consisting of a microchannel and a fiber taper is proposed in this letter. The microchannel is fabricated by combining femtosecond laser micromachining and arc fusion splicing. No subsequent chemical etching process is needed. Three sensors with microchannel widths of 4, 8, and 10 μm are prepared. The sensitivity in the RI range from 1.33 to 1.35 is up to -361.29 nm/RIU at the microchannel width of 8 μm. The sensitivity is -20 times greater than that of the paired taper-based MZI sensors and long period fiber grating pair MZI sensors. 相似文献
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