共查询到20条相似文献,搜索用时 140 毫秒
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LIU Yun-qi LIU Zhi-guo GE Chun-feng ZHAO Dong-hui GUO Zhuan-yun DONG Xiao-yi 《半导体光子学与技术》1999,5(3):171-174,178
A high sensitivity fiber Bragg grating pressure sensor by using mechanical amplifier is demonstrated. The measured pressure sensitivity is -1.80×10 -4 /MPa, which is about two orders of magnitude better than a simple monomode fiber with an in-fiber grating. The resolution of pressure measurement is 0.015 MPa based on interrogation using tunable fiber grating filter. 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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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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A novel fiber Bragg grating (FBG) current sensor with temperature compensation has been proposed. The fiber Bragg grating is glued on the surface of an isosceles triangle cantilever beam, which has a step thickness along the beam axis. Due to the electromagnetic force created by a solenoid and a permanent magnet mounted on the top of the beam, a step strain is applied on the fiber Bragg grating. The change of the electric current in the solenoid makes the spectrum of the fiber Bragg grating split. By monitoring the shift difference of the two split center wavelengths, which is related to the electric current in the solenoid, a current sensor with temperature compensation is obtained. The test range of 0-400 mA is achieved. The experimental results also show that the relationship between the shift difference of the two split center wavelengths of the FBG and the electric current has a linearity of 0.9937, and the sensitivity is about 2.64 nm/A; the test results are independent of the temoerature, so the cross sensitive problem is solved. 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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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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YANG Xian-hui YU Yong-sen ZHANG Qiu-hua SUN Sheng-he 《光电子快报》2007,3(5):342-345
A novel temperature-insensitive strain sensor based on bandwidth demodulation of the reflected light from the tapered fiber grating is presented, which is simple and low-cost and has considerable potential particularly application for strain sensing,and with the development of the interrogation system, it can demodulate both the bandwidth and the center wavelength of the reflected light from TFG to measure strain and temperature simultaneously. 相似文献
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FUHai-wei FUJun-mei QIAOXue-guang 《半导体光子学与技术》2004,10(4):278-281
A kind of fiber Bragg grating pressure sensor based on corrugated diaphragm is proposed. The relationship between the central wavelength of reflective wave of FBG and pressure is given, and the expression of the pressure sensitivity coefficient is also given. Within the range from 0 MPa to 0.3 MPa, the experimental pressure sensitivity is 7. 83 nm/MPa, which is 2 610 times than that of the bare fiber grating. The experimental results agree with the theoretical analysis. It is indicated that the expected pressure sensitivity of the sensor can be obtained by optimizing the size and mechanical parameters of the corrugated diaphragm. 相似文献
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A research on passive optical fiber current sensor based on magneto-optical crystal and a new design of light path of the sensor head are presented. Both methods of dual-channel optical detection of the polarization state of the output light and signal processing are proposed. Signal processing can obtain the linear output of the current measurement of the wire more conveniently. Theoretical analysis on the magnetooptical fiber current sensor is given, followed by experiments. After that, further analysis is made according to the results, which leads to clarifying the exiting problems and their placements. 相似文献
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Union self-compensated packaging of FBG strain sensor 总被引:1,自引:0,他引:1
To solve the cross-sensitivity to temperature of fiber Bragg grating(FBG)strain sensor,an effective method is firstly proposed for the discrimination of strain and temperature by using a single FBG adopting a special compensated structure,which is based on the thermal stress.The relationship of strain and temperature responses of FBG is analyzed theoretically.The experimental results are in agreement with the obtained theoretical analyses.This sensor structure has excellent characteristics,such as simple structure,easy manufacture and higher strain sensitivity. 相似文献
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基于倾斜光纤光栅的温度不敏感振动传感器 总被引:1,自引:0,他引:1
提出了一种基于倾斜光纤光栅与多模光纤相结合的温度不敏感振动传感器,其振动传感头是在倾斜光纤光栅与单模光纤之间加入一小段多模光纤所组成。倾斜光纤光栅的反射光谱有布拉格模和包层模两部分组成,其中多模光纤的作用是将倾斜光纤光栅反射包层模耦合到单模光纤的基模。倾斜光纤光栅包层模对外界振动很敏感,通过传感器的包层模平均输出功率完成对外界振动物理量测量。由于采用强度解调的方式,可以大大降低传感器装置的复杂性。实验表明:当传感器温度从20 ℃上升到70 ℃时,传感器的输出平均光功率均方根误差为0.01 μW,其反射光谱平均输出功率影响很小,故可以避免外界温度对测量结果的影响。 相似文献
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裸光纤Bragg光栅的温度传感特性研究 总被引:1,自引:0,他引:1
从理论上分析了光纤Bragg光栅的温度传感原理,并通过实验对裸光纤Bragg光栅的常温温度特性进行了测试。实验结果与理论分析基本一致,证明裸光纤Bragg光栅在常温下的中心波长与温度变化呈良好的线性关系,为其用作温度传感器提供了理论和实验依据。最后,指出了光纤Bragg光栅温度传感器在实际工程化应用中所需要解决的问题。 相似文献
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Fiber grating is an optical passive device which has been greatly developed in recent years.The largest application for fiber Bragg grating (FBG) is the fiber sensor.Cross-sensitivity of fiber grating sensor is the most important problem which has restricted the development of the fiber sensor.In this paper, we explain how the crosssensitivity problem is produced based on the basic principle, and we suggest a modification for the traditional dual-wavelength matrix calculation method, which is used to solve the cross-sensitivity problem.The modified calculation method has a higher accuracy than the traditional one. 相似文献
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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