After the success of the Daya Bay experiment, the Jiangmen Underground Neutrino Observatory （JUNO） was launched to measure neutrino-mass hierarchy and oscillation parameters and to study other neutrino physics. Its ...After the success of the Daya Bay experiment, the Jiangmen Underground Neutrino Observatory （JUNO） was launched to measure neutrino-mass hierarchy and oscillation parameters and to study other neutrino physics. Its central detector is set for antineutrinos from reactors, the Earth, the atmosphere, and the Sun. The main requirements of the central detector are con- tainment of 20 kt of liquid scintillator, as the target mass, and 3% energy resolution. It is about a ball-shape detector of 38.5 m with -75% coverage of PMT on its inner surface. The design of such a huge detector is a big challenge because it must meet the requirements for several different types of physics measurement and possess the feasibility and reliability in its structure and engineering, all at reasonable time and cost. One option for the JUNO central detector is a hyper-scale acrylic ball sub- merged in the water to shield the background. This paper proposes a structural scheme for such an acrylic ball that is supported by a stainless-steel truss, inspired by point-supported glass-curtain walls in civil engineering. The preliminary design of the scheme is completed and verified by finite element （FE） method using ABAQUS. FE analysis shows that the scheme can con- trol the stress level of the acrylic ball within the limit of 5 to 10 MPa, in accordance with the demand of the design objective of the central detector. The scheme is of outstanding global stability and allows various chocces on local connections. We prove that the scheme is of good feasibility and should be a reasonable option for the central detector.展开更多
Background:The Jiangmen Underground Neutrino Observatory(JUNO)is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector(CD),which contains 20 kton liquid scintilla...Background:The Jiangmen Underground Neutrino Observatory(JUNO)is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector(CD),which contains 20 kton liquid scintillator(LS)surrounded by about 18,000 photomultiplier tubes(PMTs),located 700 m underground.Purpose:The rate of cosmic muons reaching the JUNO detector is about 3 Hz,and the muon-induced neutrons and isotopes are major backgrounds for the neutrino detection.Reconstruction of the muon trajectory in the detector is crucial for the study and rejection of those backgrounds.Methods:This paper will introduce the muon-tracking algorithm in the JUNO CD,with a least-squares method of PMTs’first-hit time(FHT).Correction of the FHT for each PMT was found to be important to reduce the reconstruction bias.Results:The spatial resolution and angular resolution are better than 3 cm and 0.4 degree,respectively,and the tracking efficiency is greater than 90%up to 16 m far from the detector center.展开更多
Background The Jiangmen Underground Neutrino Observatory(JUNO)has 20 kilo-ton liquid scintillator as target mass contained by a huge acrylic sphere to carry out the research on neutrino physics.Acrylic transmittance i...Background The Jiangmen Underground Neutrino Observatory(JUNO)has 20 kilo-ton liquid scintillator as target mass contained by a huge acrylic sphere to carry out the research on neutrino physics.Acrylic transmittance is considered as an important optical performance of the JUNO Central Detector as it has a direct relationship to the number of photons detected by the JUNO Central Detector and further affects the energy resolution of JUNO.Motivation The transmittance requirement of acrylic spherical panel for the JUNO Central Detector is exceeding 96%at the wavelength of 420 nm in ultrapure water and a specific measurement system was built and studied in Institute of High Energy Physics for this purpose,as the existing equipment cannot perform the sample test in the liquid and support the long sample length of 120 mm.Methods After improving the technology of thermoforming,the transmittances of the acrylic spherical panels meet the requirement of JUNO,which guarantees the batch production of acrylic panels on time.The design of the measurement system,the constitution of hardware,the development of control and data acquisition software are introduced,and the measurement uncertainty of the system and the transmittance results of the acrylic samples from the spherical panel are discussed in this article.展开更多
Introduction The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy,precisely measure oscillation parameters and study solar neutrinos,su...Introduction The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy,precisely measure oscillation parameters and study solar neutrinos,supernova neutrinos and geo-neutrinos,etc.The central detector(CD)of JUNO has 20,000 tons liquid scintillator as target mass,which contains inside a huge acrylic sphere with inner diameter of 35.4 m,supported by a stainless steel structure.The whole structure of CD will be installed inside a cylindrical water pool,and the acrylic sphere will be submerged in the center of water pool.The operating temperature of CD is designed to be 21℃ as long as over 20 years,which is determined by the mechanical requirement of the structure and physics consideration.Methods For this operating temperature,a special cooling system will be used to maintain the temperature inside the water pool.The main structure of CD is composed of acrylic and stainless steel,and they have much different thermal expansion coefficients,strengths and life times.Change in temperature may affect the safety of CD.As part of reliability analysis,the effect of cooling system failure on the CD is considered,and finite element method is used in our thermal calculation.In this article,the temperature fields before and after cooling system failure are calculated and analyzed,and the temperatures of different locations of water pool after cooling system failure are compared and discussed in detail.展开更多
The Jiangmen Underground Neutrino Observatory （JUNO） is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector （CD）, which contains 20 kton liquid scintillator...The Jiangmen Underground Neutrino Observatory （JUNO） is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector （CD）, which contains 20 kton liquid scintillator （LS） surrounded by about 17000 photomultiplier tubes （PMTs）. Due to the large fiducial volume and huge number of PMTs, the simulation of a muon particle passing through the CD with the Geant4 toolkit becomes an extremely computation-intensive task. This paper presents a fast simulation implementation using a so-called voxel method： for scintillation photons generated in a certain LS voxel, the PMT＇s response is produced beforehand with Geant4 and then introduced into the simulation at runtime. This parameterisation method successfully speeds up the most CPU consuming process, the optical photon＇s propagation in the LS, by a factor of 50. In the paper, the comparison of physics performance between fast and full simulation is also given.展开更多
Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy and precisely measure oscillation parameters and study the solar neutri...Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy and precisely measure oscillation parameters and study the solar neutrino,supernova neutrino,geo-neutrino,etc.JUNO's central detector(CD)has 20 kilo-ton liquid scintillator as target mass,which is contained by a huge acrylic sphere with the inner diameter of 35.4 m,and the acrylic sphere is supported by a stainless steel structure through 590 connecting bars.Motivation Part of the connecting bars bear pull force and the other bars bear push force.There is a direct relationship between the stress of connecting bars and that of acrylic sphere.For the installation process of the CD,the pretightening force and axial force of the connecting bars should be monitored with accuracy,and for the filling process and running condition,the precise measurement of axial force can indicate the safety of structure of the CD.Methods Statistical method was used to evaluate the performance of measurement schemes,and 4-fiber Bragg grating measurement scheme was determined to be the final scheme,which can get the measurement uncertainty better than 0.7 kN.Performance of different measurement schemes are discussed in detail,and some related finite element analysis and evalu-ation method are also introduced in this paper.展开更多
Background The Central Detector(CD)of the Jiangmen Underground Neutrino Observatory(JUNO)uses 20,000 tons of liquid scintillator as target mass,and the design value of energy resolution of neutrino is 3%at 1 meV.Acryl...Background The Central Detector(CD)of the Jiangmen Underground Neutrino Observatory(JUNO)uses 20,000 tons of liquid scintillator as target mass,and the design value of energy resolution of neutrino is 3%at 1 meV.Acrylic transmittance is an important parameter for CD in order to maximize the detection of scintillating photons.Motivation The composition and processing techniques of acrylic can surely affect its transmittance.How the composition,thermoforming temperature,heat preservation time and surface treatment process of acrylic affect its transmittance was measured and analyzed.Methods According to these studies,JUNO determined its special acrylic composition and processing techniques:no components of plasticizer or anti-UV in the composition,decreasing the time span and temperature during the demolding of flat panel,and adopting suitable thermoforming temperature of spherical panel.Results Finally,the preproduction of spherical acrylic panels meets the JUNO requirement confirming a transmittance in ultrapure water greater than 96%at the wavelength of 420 nm.展开更多
Introduction The structure of the Jiangmen Underground Neutrino Observatory(JUNO)CentralDetector(CD)was designed using finite element methods(FEM).The structure of the small JUNOCDprototypewas also designed using the ...Introduction The structure of the Jiangmen Underground Neutrino Observatory(JUNO)CentralDetector(CD)was designed using finite element methods(FEM).The structure of the small JUNOCDprototypewas also designed using the same structural scheme and method as those of the CD,and the load test was carried out after the accomplishment of structure design and manufacturing.Methods The load test can help verify the performance and reliability of the mechanical monitoring system and liquid filling system of the CD,verify the consistency of FEM calculations and axial force measurement results of the sensors,and accumulate experience for the installation of the connecting bars.Conclusion The measurement scheme was considered and determined,and the connecting bars’axial forces under different liquid filling conditions were measured and compared with the FEM results,the consistencies of which were good.The mechanical monitoring system and liquid filling system of theCDwere verified during the load test,which met the requirements of design and experiment.展开更多
Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy,precisely measure oscillation parameters and study solar neutrinos,supe...Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy,precisely measure oscillation parameters and study solar neutrinos,supernova neutrinos and geo-neutrinos.The JUNO Central Detector 20 kton liquid scintillator target mass is contained by a huge acrylic sphere with a 35.4 m inner diameter,supported by a stainless steel structure,and the sphere is eventually submerged in pure water.Motivation Before the JUNO Central Detector is built,a small prototype has been designed and static loading experiments will be carried out to verify the consistency of the finite-element calculations and static loading experiments and test the subsystems performances,such as the monitoring system and liquid scintillator filling system.Methods The small prototype is composed of an acrylic sphere with a 3 m inner diameter and an aluminum alloy support structure.In this article,the structure of the small prototype is briefly described.A detailed simulation study using finite element analysis is conducted to account for liquid-filled condition,temperature variation and existence of high load(due to vacuum pumping)and demonstrate a satisfying mechanical performance of the small prototype.The experimental plan about the prototype on the basis of the simulation will also be mentioned.展开更多
CBCT scanners have been widely used in angiography,radiotherapy guidance,mammography and oral maxillofacial imaging.To cut detector size,reduce manufacturing costs and radiation dose while keeping a reasonable FOV,the...CBCT scanners have been widely used in angiography,radiotherapy guidance,mammography and oral maxillofacial imaging.To cut detector size,reduce manufacturing costs and radiation dose while keeping a reasonable FOV,the flat panel detector can be placed off-center horizontally.This scanning configuration extends the FOV effectively.However,each projection is transversely truncated,bringing errors and artifacts in reconstruction.In this paper,a simple but practical method is proposed for this scanning geometry based on truncation compensation and the modified FDK algorithm.Numerical simulations with jaw phantom were conducted to evaluate the accuracy and practicability of the proposed method.A novel CBCT system for maxillofacial imaging is used for clinical test,which is equipped with an off-center small size flat panel detector.Results show that reconstruction accuracy is acceptable for clinical use,and the image quality appears sufficient for specific diagnostic requirements.It provides a novel solution for clinical CBCT system,in order to reduce radiation dose and manufacturing cost.展开更多
研究并实现了一种基于256像元线阵In Ga As扫描的光纤布拉格光栅传感解调系统。针对线阵In Ga As探测器,分析了光纤光栅反射谱中心波长定位原理,可实现多个FBG光谱的同时解调,单通道解调传感器数量取决于FBG的带宽和中心波长漂移范围。...研究并实现了一种基于256像元线阵In Ga As扫描的光纤布拉格光栅传感解调系统。针对线阵In Ga As探测器,分析了光纤光栅反射谱中心波长定位原理,可实现多个FBG光谱的同时解调,单通道解调传感器数量取决于FBG的带宽和中心波长漂移范围。对256个像素点的光谱数据,通过设置的阈值判断反射谱的个数,分别对每一个谱峰进行拟合,基于高斯指数曲线模型实现了寻峰算法,获得了中心波长。搭建FBG解调系统采集光谱数据,寻峰算法的稳定性达到±0.5 pm。该解调方法无机械移动部件,实现了多光纤光栅波长寻峰的并行快速响应,波长解调范围为1 525~1 570 nm,为多光纤光栅传感提供了高速解调方案。展开更多
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA10010200)the Tsinghua University Initiative Scientific Research Program(Grant No.20131089288)
文摘After the success of the Daya Bay experiment, the Jiangmen Underground Neutrino Observatory （JUNO） was launched to measure neutrino-mass hierarchy and oscillation parameters and to study other neutrino physics. Its central detector is set for antineutrinos from reactors, the Earth, the atmosphere, and the Sun. The main requirements of the central detector are con- tainment of 20 kt of liquid scintillator, as the target mass, and 3% energy resolution. It is about a ball-shape detector of 38.5 m with -75% coverage of PMT on its inner surface. The design of such a huge detector is a big challenge because it must meet the requirements for several different types of physics measurement and possess the feasibility and reliability in its structure and engineering, all at reasonable time and cost. One option for the JUNO central detector is a hyper-scale acrylic ball sub- merged in the water to shield the background. This paper proposes a structural scheme for such an acrylic ball that is supported by a stainless-steel truss, inspired by point-supported glass-curtain walls in civil engineering. The preliminary design of the scheme is completed and verified by finite element （FE） method using ABAQUS. FE analysis shows that the scheme can con- trol the stress level of the acrylic ball within the limit of 5 to 10 MPa, in accordance with the demand of the design objective of the central detector. The scheme is of outstanding global stability and allows various chocces on local connections. We prove that the scheme is of good feasibility and should be a reasonable option for the central detector.
基金This work is supported by National Natural Science Foundation of China(Grant Nos.11575226,11605222)Joint Large Scale Scientific Facility Funds of NSFC and CAS(Grant No.U1532258)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA10010900)。
文摘Background:The Jiangmen Underground Neutrino Observatory(JUNO)is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector(CD),which contains 20 kton liquid scintillator(LS)surrounded by about 18,000 photomultiplier tubes(PMTs),located 700 m underground.Purpose:The rate of cosmic muons reaching the JUNO detector is about 3 Hz,and the muon-induced neutrons and isotopes are major backgrounds for the neutrino detection.Reconstruction of the muon trajectory in the detector is crucial for the study and rejection of those backgrounds.Methods:This paper will introduce the muon-tracking algorithm in the JUNO CD,with a least-squares method of PMTs’first-hit time(FHT).Correction of the FHT for each PMT was found to be important to reduce the reconstruction bias.Results:The spatial resolution and angular resolution are better than 3 cm and 0.4 degree,respectively,and the tracking efficiency is greater than 90%up to 16 m far from the detector center.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA100102)
文摘Background The Jiangmen Underground Neutrino Observatory(JUNO)has 20 kilo-ton liquid scintillator as target mass contained by a huge acrylic sphere to carry out the research on neutrino physics.Acrylic transmittance is considered as an important optical performance of the JUNO Central Detector as it has a direct relationship to the number of photons detected by the JUNO Central Detector and further affects the energy resolution of JUNO.Motivation The transmittance requirement of acrylic spherical panel for the JUNO Central Detector is exceeding 96%at the wavelength of 420 nm in ultrapure water and a specific measurement system was built and studied in Institute of High Energy Physics for this purpose,as the existing equipment cannot perform the sample test in the liquid and support the long sample length of 120 mm.Methods After improving the technology of thermoforming,the transmittances of the acrylic spherical panels meet the requirement of JUNO,which guarantees the batch production of acrylic panels on time.The design of the measurement system,the constitution of hardware,the development of control and data acquisition software are introduced,and the measurement uncertainty of the system and the transmittance results of the acrylic samples from the spherical panel are discussed in this article.
基金This work is supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA100102).
文摘Introduction The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy,precisely measure oscillation parameters and study solar neutrinos,supernova neutrinos and geo-neutrinos,etc.The central detector(CD)of JUNO has 20,000 tons liquid scintillator as target mass,which contains inside a huge acrylic sphere with inner diameter of 35.4 m,supported by a stainless steel structure.The whole structure of CD will be installed inside a cylindrical water pool,and the acrylic sphere will be submerged in the center of water pool.The operating temperature of CD is designed to be 21℃ as long as over 20 years,which is determined by the mechanical requirement of the structure and physics consideration.Methods For this operating temperature,a special cooling system will be used to maintain the temperature inside the water pool.The main structure of CD is composed of acrylic and stainless steel,and they have much different thermal expansion coefficients,strengths and life times.Change in temperature may affect the safety of CD.As part of reliability analysis,the effect of cooling system failure on the CD is considered,and finite element method is used in our thermal calculation.In this article,the temperature fields before and after cooling system failure are calculated and analyzed,and the temperatures of different locations of water pool after cooling system failure are compared and discussed in detail.
基金Supported by Strategic Priority Research Program of Chinese Academy of Sciences(XDA10010900)National Natural Science Foundation of China(11405279,11575224)
文摘The Jiangmen Underground Neutrino Observatory （JUNO） is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector （CD）, which contains 20 kton liquid scintillator （LS） surrounded by about 17000 photomultiplier tubes （PMTs）. Due to the large fiducial volume and huge number of PMTs, the simulation of a muon particle passing through the CD with the Geant4 toolkit becomes an extremely computation-intensive task. This paper presents a fast simulation implementation using a so-called voxel method： for scintillation photons generated in a certain LS voxel, the PMT＇s response is produced beforehand with Geant4 and then introduced into the simulation at runtime. This parameterisation method successfully speeds up the most CPU consuming process, the optical photon＇s propagation in the LS, by a factor of 50. In the paper, the comparison of physics performance between fast and full simulation is also given.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA100102)
文摘Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy and precisely measure oscillation parameters and study the solar neutrino,supernova neutrino,geo-neutrino,etc.JUNO's central detector(CD)has 20 kilo-ton liquid scintillator as target mass,which is contained by a huge acrylic sphere with the inner diameter of 35.4 m,and the acrylic sphere is supported by a stainless steel structure through 590 connecting bars.Motivation Part of the connecting bars bear pull force and the other bars bear push force.There is a direct relationship between the stress of connecting bars and that of acrylic sphere.For the installation process of the CD,the pretightening force and axial force of the connecting bars should be monitored with accuracy,and for the filling process and running condition,the precise measurement of axial force can indicate the safety of structure of the CD.Methods Statistical method was used to evaluate the performance of measurement schemes,and 4-fiber Bragg grating measurement scheme was determined to be the final scheme,which can get the measurement uncertainty better than 0.7 kN.Performance of different measurement schemes are discussed in detail,and some related finite element analysis and evalu-ation method are also introduced in this paper.
基金the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA100102).
文摘Background The Central Detector(CD)of the Jiangmen Underground Neutrino Observatory(JUNO)uses 20,000 tons of liquid scintillator as target mass,and the design value of energy resolution of neutrino is 3%at 1 meV.Acrylic transmittance is an important parameter for CD in order to maximize the detection of scintillating photons.Motivation The composition and processing techniques of acrylic can surely affect its transmittance.How the composition,thermoforming temperature,heat preservation time and surface treatment process of acrylic affect its transmittance was measured and analyzed.Methods According to these studies,JUNO determined its special acrylic composition and processing techniques:no components of plasticizer or anti-UV in the composition,decreasing the time span and temperature during the demolding of flat panel,and adopting suitable thermoforming temperature of spherical panel.Results Finally,the preproduction of spherical acrylic panels meets the JUNO requirement confirming a transmittance in ultrapure water greater than 96%at the wavelength of 420 nm.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA100102).
文摘Introduction The structure of the Jiangmen Underground Neutrino Observatory(JUNO)CentralDetector(CD)was designed using finite element methods(FEM).The structure of the small JUNOCDprototypewas also designed using the same structural scheme and method as those of the CD,and the load test was carried out after the accomplishment of structure design and manufacturing.Methods The load test can help verify the performance and reliability of the mechanical monitoring system and liquid filling system of the CD,verify the consistency of FEM calculations and axial force measurement results of the sensors,and accumulate experience for the installation of the connecting bars.Conclusion The measurement scheme was considered and determined,and the connecting bars’axial forces under different liquid filling conditions were measured and compared with the FEM results,the consistencies of which were good.The mechanical monitoring system and liquid filling system of theCDwere verified during the load test,which met the requirements of design and experiment.
文摘Background The Jiangmen Underground Neutrino Observatory(JUNO)is a multipurpose neutrino experiment designed to determine neutrino mass hierarchy,precisely measure oscillation parameters and study solar neutrinos,supernova neutrinos and geo-neutrinos.The JUNO Central Detector 20 kton liquid scintillator target mass is contained by a huge acrylic sphere with a 35.4 m inner diameter,supported by a stainless steel structure,and the sphere is eventually submerged in pure water.Motivation Before the JUNO Central Detector is built,a small prototype has been designed and static loading experiments will be carried out to verify the consistency of the finite-element calculations and static loading experiments and test the subsystems performances,such as the monitoring system and liquid scintillator filling system.Methods The small prototype is composed of an acrylic sphere with a 3 m inner diameter and an aluminum alloy support structure.In this article,the structure of the small prototype is briefly described.A detailed simulation study using finite element analysis is conducted to account for liquid-filled condition,temperature variation and existence of high load(due to vacuum pumping)and demonstrate a satisfying mechanical performance of the small prototype.The experimental plan about the prototype on the basis of the simulation will also be mentioned.
基金Supported by National Key Technology R&D Program of the Ministry of Science and Technology(No.2012BAI07B05)
文摘CBCT scanners have been widely used in angiography,radiotherapy guidance,mammography and oral maxillofacial imaging.To cut detector size,reduce manufacturing costs and radiation dose while keeping a reasonable FOV,the flat panel detector can be placed off-center horizontally.This scanning configuration extends the FOV effectively.However,each projection is transversely truncated,bringing errors and artifacts in reconstruction.In this paper,a simple but practical method is proposed for this scanning geometry based on truncation compensation and the modified FDK algorithm.Numerical simulations with jaw phantom were conducted to evaluate the accuracy and practicability of the proposed method.A novel CBCT system for maxillofacial imaging is used for clinical test,which is equipped with an off-center small size flat panel detector.Results show that reconstruction accuracy is acceptable for clinical use,and the image quality appears sufficient for specific diagnostic requirements.It provides a novel solution for clinical CBCT system,in order to reduce radiation dose and manufacturing cost.
文摘研究并实现了一种基于256像元线阵In Ga As扫描的光纤布拉格光栅传感解调系统。针对线阵In Ga As探测器,分析了光纤光栅反射谱中心波长定位原理,可实现多个FBG光谱的同时解调,单通道解调传感器数量取决于FBG的带宽和中心波长漂移范围。对256个像素点的光谱数据,通过设置的阈值判断反射谱的个数,分别对每一个谱峰进行拟合,基于高斯指数曲线模型实现了寻峰算法,获得了中心波长。搭建FBG解调系统采集光谱数据,寻峰算法的稳定性达到±0.5 pm。该解调方法无机械移动部件,实现了多光纤光栅波长寻峰的并行快速响应,波长解调范围为1 525~1 570 nm,为多光纤光栅传感提供了高速解调方案。
