具有温度补偿的LPFG功率解调系统的设计与实现
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摘要
传统的利用光纤Bragg光栅(FBG)反射光作为长周期光纤光栅(LPFG)入射光的解调方式,无法避免温度的影响。本文提出了一种具有温度补偿功能的LPFG功率解调方案,将FBG的Bragg波长由压电陶瓷(PZT)的驱动电压控制,使得FBG谐振波长始终跟随LPFG谐振波长,以此抵消温度对传统功率解调中的影响。这种解调方案适用于LPFG透射光谱随物理量变化谱形也发生变化的传感,如微弯、横向负载等特性。利用本系统对LPFG的横向负载特性进行试验,结果表明,采用此解调方案获得的实验数据具有与光谱仪相同的功率变化趋势,能够始终监测LPFG的谐振峰幅值,实现温度补偿的功率解调,更适合于动态解调。对LPFG的温度特性进行功率解调实验,结果也验证了解调系统具有温度补偿功能。
The traditional power demodulation method uses fiber Bragg grating(FBG) reflected light as the long period fiber grating(LPFG) incident light,which is unable to avoid the influence of the temperature.This paper puts forward a kind of power demodulation scheme which could compensate the environment temperature of the LPFG,and the Bragg wavelength will be controlled by PZT driving voltage,making the FBG resonance wavelength always follow LPFG transmission resonance wavelength,which could counteract the influence of the temperature.This demodulation scheme is suitable for physical quantity measurement,in which the LPFG transmission spectrum shape changes,such as micro bending,lateral load characteristics.From the LPFG transverse load characteristic test by this system,the results show that it has the same trend with optical spectrometer analyzer,it can always monitor LPFG resonant peak amplitude and realize the power demodulation with temperature compensation,and the method is more suitable for dynamic demodulation.From the temperature characteristics of LPFG power demodulation experiments,it is verified that the demodulation system has the function of temperature compensation.
The traditional power demodulation method uses fiber Bragg grating(FBG) reflected light as the long period fiber grating(LPFG) incident light,which is unable to avoid the influence of the temperature.This paper puts forward a kind of power demodulation scheme which could compensate the environment temperature of the LPFG,and the Bragg wavelength will be controlled by PZT driving voltage,making the FBG resonance wavelength always follow LPFG transmission resonance wavelength,which could counteract the influence of the temperature.This demodulation scheme is suitable for physical quantity measurement,in which the LPFG transmission spectrum shape changes,such as micro bending,lateral load characteristics.From the LPFG transverse load characteristic test by this system,the results show that it has the same trend with optical spectrometer analyzer,it can always monitor LPFG resonant peak amplitude and realize the power demodulation with temperature compensation,and the method is more suitable for dynamic demodulation.From the temperature characteristics of LPFG power demodulation experiments,it is verified that the demodulation system has the function of temperature compensation.
引文
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[13]SHAO Min,QIAO Xue-guang,FENG De-quan,et al.Theo-retical and experimental study on seismic sensor basedon fiber Bragg grating[J].Journal of Optoelectronics.Laser,2012,23(3):418-424.邵敏,乔学光,冯德全,等.基于光纤Bragg光栅的地震检波器的理论与实验研究[J].光电子.激光,2012,23(3):418-424.
[14]HU Xing-liu,LIANG Da-kai,FANG Ting,et al.Research onthe temperature characteristics of cascaded long periodfiber gratings[J].Journal of Optoelectronics.Laser,2012,23(9):1659-1664.胡兴柳,梁大开,方挺,等.级联长周期光纤光栅的温度特性研究[J].光电子.激光,2012,23(9):1659-1664.
[15]WANG Yan,LIANG Da-kai,LI Dan,et al.Embedded long-period fiber grating sensors for monitoring the corrosionsteel in reinforced concrete structures[J].Journal of Op-toelectronics.Laser,2012,23(8):1539-1544.王彦,梁大开,李丹,等.混凝土中预埋式LPFG波长解调的耐久性健康监测[J].光电子.激光,2012,23(8):1539-1544.
[2]Daniel Alfredo Chamorro Enr.′quez n,Alberto R.da Cruz,Maria Thereza M,et al.Hybrid FBG-LPG sensor for sur-rounding refractive index and temperature simultaneousdiscrimination[J].Optics&Laser Technology,2012,(44):981-986.
[3]SHI Yan-jun,GU Zheng-tian.Design of high-sensitivitymetal-coated LPFG sensor based on material dispersion[J].Optoelectronics Letters,2012,8(4):269-272.
[4]LIU Hong-yue,ZENG Jie,LIANG Da-kai,et al.Long-periodfiber grating atmospheric pressure sensor based on mi-cro-bending characteristic[J].Chinese Journal of Scien-tific Instrument,2009,30(8):1692-1696.刘宏月,曾捷,梁大开,等.基于盒膜结构的微弯式长周期光纤光栅气压传感器研究[J].仪器仪表学报,2009,30(8):1692-1696.
[5]LIANG Rui-bing,SUN Qi-zhen,WO Jiang-hai.Investigationon micro/nanofiber Bragg grating for refractive indexsensing[J].Optics Communications,2012,285:1128-1133.
[6]WANG Yan,LIANG Da-kai,ZHOU Bing.Vibration monito-ring of smart structure using micro-bending characteristicof long-period fiber grating[J].Chinese Journal of Scien-tific Instrument,2008,29(6):1154-1158.王彦,梁大开,周兵.基于长周期光纤光栅微弯特性的智能结构振动监测研究[J].仪器仪表学报,2008,29(6):1154-1158.
[7]Wang J N,Luo C Y.Long-period fiber grating sensor forthe measurement of liquid level and fluid-flow velocity[J].Sensors,2012,12:4578-4593.
[8]HAN Qun,LAN Xin-wei,HUANG Jie,et al.Long-periodcrating inscribed on concatenated double-clad and single-clad fiber for simultaneous measurement of temperatureand refractive index[J].IEEE Photonics Technology Let-ters,2012,24(13):1130-1132.
[9]ZHOU Rui,QIAO Xue-guang,WANG Ruo-hui,et al.Seis-mic wave interrogatin system based on the linear edgefilter characteristics of long period fiber grating[J].Jour-nal of Optoelectronics.Laser,2011,22(7):987-991.周锐,乔学光,王若晖,等.基于长周期光纤光栅线性边缘滤波的地震波解调系统[J].光电子.激光,2011,22(7):987-991.
[10]ZHU Zhu,ZENG Jie,Liang Da-kia,et al.Research on dy-namic demodulating technique for fiber grating sensorsystem[J].Chinese Journal of Lasers,2008,35(2):254-258.朱珠,曾捷,梁大开,等.一种光纤布拉格光栅动态解调系统的研究[J].中国激光,2008,35(2):254-258.
[11]ZHAO Hong-xia,DING Zhi-qun,FANG Xiao-hui,et al.Anovel LPFG concentration sensing demodulation tech-nique[J].Optoelectronic Technology,2010,30(1):26-28.赵洪霞,丁志群,方晓惠,等.一种LPFG浓度传感解调技术研究[J].光电子技术,2010,30(1):26-28.
[12]JIANG Ming-shun,MENG Ling,SUI Qing-mei,et al.Highsensitivity vibration detection system based on doubleLPFG demodulation[J].Journal of Optoelectronics.La-ser,2011,22(8):1207-1210.姜明顺,孟玲,隋青美,等.基于双LPFG解调的高灵敏度振动检测系统[J].光电子.激光,2011,22(8):1207-1210.
[13]SHAO Min,QIAO Xue-guang,FENG De-quan,et al.Theo-retical and experimental study on seismic sensor basedon fiber Bragg grating[J].Journal of Optoelectronics.Laser,2012,23(3):418-424.邵敏,乔学光,冯德全,等.基于光纤Bragg光栅的地震检波器的理论与实验研究[J].光电子.激光,2012,23(3):418-424.
[14]HU Xing-liu,LIANG Da-kai,FANG Ting,et al.Research onthe temperature characteristics of cascaded long periodfiber gratings[J].Journal of Optoelectronics.Laser,2012,23(9):1659-1664.胡兴柳,梁大开,方挺,等.级联长周期光纤光栅的温度特性研究[J].光电子.激光,2012,23(9):1659-1664.
[15]WANG Yan,LIANG Da-kai,LI Dan,et al.Embedded long-period fiber grating sensors for monitoring the corrosionsteel in reinforced concrete structures[J].Journal of Op-toelectronics.Laser,2012,23(8):1539-1544.王彦,梁大开,李丹,等.混凝土中预埋式LPFG波长解调的耐久性健康监测[J].光电子.激光,2012,23(8):1539-1544.
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