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为了进一步提高光纤光栅解调系统的性能,提出和研究了一种新颖的基于可调谐F-P(Fabry-Perot)滤波器的光纤光栅解调技术,并以此为基础构建了探测系统。系统使用一个固定波长的参考光纤光栅作为波长参考元件,通过对传感光纤光栅与参考光纤光栅的波长测量与差值运算,消除了可调谐FP滤波器腔长漂移对测量精度的影响。给出压电陶瓷电压对应的伸长量,有效地减小了压电陶瓷非线性对测量的影响,提高了光纤光栅波长的测量精度。在测量范围内,最大非线性偏差为0.5%。 相似文献
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LIU Bo SUO Rui ZHOU Kai-ming JIN Long ZHANG Jian LIU Yan-ge KAI Gui-yun DONG Xiao-yi 《光电子快报》2007,3(1)
An 800 nm band fiber Bragg grating sensing interrogation system using tilted FBG as the core wavelength division component is presented. A charge coupled device (CCD) linear array is put on the focal plane of the lens to detect the light. TFBG is used to tap light out of the fiber core to fiber cladding. The sensing wavelength is 795 to 830 nm,with accuracy of 20 pm and scan speed 100 Hz. Using FBG sensor,we achieve the temperature sensitivity of 1.8 ℃ and strain sensitivity of 18 με. 相似文献
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ZHANG Zhi-guo ZHANG Min YE Pei-da 《光电子快报》2007,3(5):368-371
We proposed a scheme of fiber Bragg grating (FBG) sensor interrogation system based on all fiber Mach-Zehnder Interfer- ometer (MZI) edge filter and tunable-FBG. The equal power signals from FBG sensor and tunable FBG are coupled into port 1 and port 2 of MZI respectively. The experimental results show that the interrogation precision of the proposed system is 0.02 nm in a range of 1nm. Furthermore, the precision can be improved by adjusting the two interference arms of the filter. 相似文献
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WUGuo-qing BIWei-hong LIHong 《半导体光子学与技术》2005,11(1):56-60
One of the problems in using grating sensors is how to measure a small Bragg wavelength shift accurately. Nowadays demodulation techniques are mainly based on the edge filter, tunable filter, or interferometric scanning methods. Interferometric demodulation is widely accepted as the technology which can provide the high sensitivity. An interrogation system using the interferometric scanning method is presented, in which an unbalanced fiber M-Z interferometer is used as the wavelength scanner for temperature measurement. A novel fiber Bragg grating sensor system based on M-Z interferometric demodulation technique is presented in this paper. The temperature sensitivity measured in the experiment is almost consistent with that obtained from the theoretic calculation. 相似文献
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A new technique for the interrogation of interferometric-based fibre-optic sensors using an acousto-optic tunable filter (AOTF) is demonstrated The scheme involves frequency shift keying (FSK) of the RF drive to the AOTF to track the shift of a single fringe peak from an interferometric sensor. Experimental results are presented for a Fizeau interferometer. The technique provides high accuracy, plus a large unambiguous tracking range free from interruptions 相似文献
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LIU Bo SUO Rui ZHOU Kai-ming JIN Long ZHANG Jian LIU Yan-ge KAI Gui-yun DONG Xiao-yi 《光电子快报》2007,3(1):62-64
An 800 nm band fiber Bragg grating sensing interrogation system using tilted FBG as the core wavelength division component is presented. A charge coupled device (CCD) linear array is put on the focal plane of the lens to detect the light. TFBG is used to tap light out of the fiber core to fiber cladding. The sensing wavelength is 795 to 830 nm, with accuracy of 20 pm and scan speed 100Hz. Using FBG sensor, we achieve the temperature sensitivity of 1.8 ℃ and strain sensitivity of 18 με. 相似文献
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《Photonics Technology Letters, IEEE》2008,20(21):1790-1792
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Ferreira L.A. Diatzikis E.V. Santos J.L. Farahi F. 《Lightwave Technology, Journal of》1998,16(9):1620-1630
A demodulation scheme for fiber Bragg grating (FBG) sensors is presented. It is based on the generation of an electrical carrier by using a modulated multimode laser diode to illuminate the fiber grating. The change in Bragg wavelength is measured by tracking the phase of the carrier at the detector output in either an open- or a closed-loop scheme. A theoretical analysis of the interrogation technique in terms of linearity and dynamic range is presented. Experimental data were obtained for both strain and temperature measurements. Sensitivities of 0.7 μϵ/√Hz and 0.05°C/√Hz were obtained over a dynamic range of ≈60 dB. The application of this demodulation scheme to a multiplexed sensing system is also demonstrated 相似文献
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《Photonics Technology Letters, IEEE》2009,21(8):519-521
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An intensity-modulated, fiber Bragg grating (FBG) sensor system based on radio-frequency (RF) signal measurement is presented. The RF signal is generated at a photodetector by two modulated optical signals reflected from the sensing FBG and a reference one. Bragg wavelength shift of the sensing FBG changes intensity of the RF signal by changing phase difference between the two optical signals, with temperature effect being compensated automatically by the reference FBG. Strain measurement with a maximum sensitivity of -0.34 V/ has been achieved. 相似文献
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提出了一种基于线型腔拉曼光纤激光器的长距离分布式光纤布拉格光栅(FBG)传感解调系统,并进行了理论分析和实验验证。传感光纤布拉格光栅构成拉曼光纤激光器腔镜的一端,受一维调节器调节控制的匹配光纤布拉格光栅构成腔镜的另一端。一维调节器与步进电机相连,步进电机由计算机(PC)通过可编程逻辑控制器(PLC)进行控制,一维调节器通过调节匹配光纤布拉格光栅的周期来控制激光器的输出。实验结果表明,传感解调系统能很好地实现长距离分布式传感及传感信号的检测。30 km非归零色散位移光纤(NZDSF)用于拉曼增益可以产生信噪比大于40 dB的稳定拉曼激光输出,在4.2 nm范围内系统解调精度为0.05 nm。 相似文献
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基于3×3耦合器的马赫-曾德尔干涉仪的光纤光栅波长解调技术 总被引:8,自引:3,他引:5
介绍了一种基于3×3和2×2光纤耦合器构成的非平衡马赫-曾德尔干涉仪的波长解调方案。理论分析和数据对比表明,相对于由两个2×2光纤耦合器构成的马赫-曾德尔干涉仪,本干涉仪具有宽谱的灵敏度、能跟踪波长的变化方向和相位展开的优点。实验方案用于测量固定在悬臂梁上的传感光纤布拉格光栅(FBG)的峰值波长变化,获得了±1 pm的静态波长解调精度,在10 Hz处的动态分辨率为27 n/εHz。相位展开算法使得应变测量范围达到了2014με,对应的相位变化为3.22π。 相似文献
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Johnson G.A. Todd M.D. Althouse B.L. Chang C.C. 《Lightwave Technology, Journal of》2000,18(8):1101-1105
We present a new technique for fiber Bragg grating (FBG) sensor interrogation and multiplexing. The technique combines a scanning bandpass filter used to multiplex by wavelength multiple gratings in a single fiber, and an unbalanced Mach-Zehnder fiber interferometer made with a 3×3 coupler to detect strain-induced wavelength shifts. A demonstration system interrogates four gratings in a single fiber at a sampling rate up to 20 kHz, with a noise floor measured at less than 10 nϵ/√(Hz) above 0.1 Hz 相似文献
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提出利用镍钛合金压杆弯曲应变引入到光纤布拉格光栅(fiber Bragg grating,FBG)实现无中心波长漂移可调谐线性啁啾化方法并进行了实验验证。设计一种镍钛合金压杆结构,理论计算并有限元分析验证了应变分布情况。将光纤光栅粘贴在镍钛合金压杆上,弯曲压杆将线性拉伸与压缩应变引入到栅区,利用光谱仪记录反射谱。实验结果表明,当压杆移动距离达到12.5 mm时,反射谱带宽增大到1.57 nm,中心波长漂移量仅为0.11 nm。利用光纤光栅啁啾化理论,结合传输矩阵法和龙格库塔法实现啁啾光纤光栅光谱重构。实验结果与仿真结果吻合。该方法制作的啁啾光栅可以实现带宽可调谐且基本无中心波长漂移,在光纤传输和传感领域均具有一定的应用前景。 相似文献
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Hwa-Yaw Tam 《中国电子科技》2008,6(4):434-437
An intensity-modulated, fiber Bragg grating (FBG) sensor system based on radio-frequency (RF) signal measurement is presented. The RF signal is generated at a photodetector by two modulated optical signals reflected from the sensing FBG and a reference one. Bragg wavelength shift of the sensing FBG changes intensity of the RF signal by changing phase difference between the two optical signals, with temperature effect being compensated automatically by the reference FBG, Strain measurement with a maximum sensitivity of -0.34 μV/με has been achieved. 相似文献
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基于环型腔掺Er光纤激光器的FBG传感系统 总被引:3,自引:3,他引:0
提出并实验了一种基于可调谐环型腔掺Er光纤激光器的光纤光栅(FBG)传感解调系统。传感FBG与受一维调节器调节控制的匹配FBG共同构成环型腔掺Er光纤激光器的窄带滤波器。一维调节器与步进电机相连,步进电机由PC通过可编程逻辑控制器(PLC)进行控制,一维调节器通过调节匹配FBG的周期以匹配传感FBG的周期从而滤除激光的输出,由激光的输出特性来判断2个FBG周期的匹配性并完成对传感FBG周期的测量。调节器控制系统、激光信号检测电路与数据处理模块共同完成传感信号的解调。实验测得,在4.04nm范围内,系统的波长探测精度为0.02nm。 相似文献