By using a graded-index multimode fiber （GI-MMF） with a relatively flat index profile and high refractive index of the fiber core, a microextrinsic fiber-optic Fabry Prot interferometric （MEFPI） strain sensor is f...By using a graded-index multimode fiber （GI-MMF） with a relatively flat index profile and high refractive index of the fiber core, a microextrinsic fiber-optic Fabry Prot interferometric （MEFPI） strain sensor is fabricated through chemical etching and fusion splicing. Higher reflectance of the microcavity is obtained due to the less-curved inner wall in the center of the fiber core after etching and higher index contrast between the GI-MMF core and air. The maximum reflection of the sensor is enhanced 12 dB than that obtained by etching of the Er- or B-doped fibers. High fringe contrast of 22 dB is obtained. The strain and temperature responses of the MEFPI sensors are investigated in this experiment. Good linearity and high sensitivity are achieved, with wavelength-strain and wavelength-temperature sensitivities of 7.82 pm/με and 5.01 pm/°C, respectively.展开更多
This paper proposes a Mach Zehnder/Fabry Perot Interferometer(MZI/FPI)fiber sensor based on Single-mode Fiber(SMF)and Hollow-core Fiber(HCF),which has high sensitivity to temperature and lateral loads.The proposed dev...This paper proposes a Mach Zehnder/Fabry Perot Interferometer(MZI/FPI)fiber sensor based on Single-mode Fiber(SMF)and Hollow-core Fiber(HCF),which has high sensitivity to temperature and lateral loads.The proposed device consists of two single-mode fiber cones formed by manually controlling the fusion splicer and an air cavity formed by fusing a section of hollow-core fiber.The structure of the sensor is a double cone cascaded air cavity.At the beginning of the design,we compared the basic transmission spectra of single cone structure and double cone structure experimentally,and therefore chose to use double cone structure and air cavity cascade.Light undergoes its first reflection at the first interface between the single-mode fiber and the air cavity structure,and its second reflection at the second interface between the air cavity structure and the single-mode fiber.The two reflected light waves produced by the two reflections form FP interference,which can be used to measure lateral loads.The transmitted light is excited through the first cone,and a portion of the core mode light is excited to the cladding,while another portion of the core mode light continues to propagate in the core.The light couples at the second cone,and the cladding mode light couples back into the core,forming MZ interference with the core mode light,which can be used to measure temperature.The use of hollow-core fiber to form an air cavity has little effect on transmitted light,while avoiding the problem of crosstalk in dual parameter measurements.By designing temperature and lateral load experiments,this article verifies the sensitivity characteristics of this sensor to temperature and lateral loads.A significant redshift phenomenon was observed in the temperature experiment.A significant redshift phenomenon also occurred in the lateral load experiment.Through wavelength demodulation,the experimental results show that the wavelength sensitivity of the sensor to temperature is 56.29 pm/℃in the range of 30℃to 80℃.The wavelength sensitivity of the sensor to lateral loads is 1.123 nm/N in the range of 0~5 N.In addition,we have prepared multiple sets of fiber optic sensors with this structure and conducted repeated experiments to verify that the sensing performance of this structure of fiber optic sensors for temperature and lateral load is relatively stable.Also,the different waist diameters of cones will have a certain impact on the transmission spectrum of MZ,while the length of the air cavity will also have a certain impact on the reflection spectrum of FP.This article lists some fiber optic sensors for dual parameter measurement of temperature and lateral load.Compared with the listed sensors,the fiber optic sensor proposed in this article has better sensitivity to temperature and lateral load.And the fiber optic sensor proposed in this article has a simple manufacturing process,low production cost,and good performance,which has certain prospects in scientific research and industrial production.展开更多
The last half-century was transformed by the electronic revolution that essentially reproduced the human brain and its computing capacity on a chip. But over time, scientists have realized that something was missing t...The last half-century was transformed by the electronic revolution that essentially reproduced the human brain and its computing capacity on a chip. But over time, scientists have realized that something was missing to give life, so to speak, to the small chip with a brain： One needed to awaken its senses and develop its muscles! This challenge was solved through MEMS （micro electro mechanical systems）. Indeed, MEMS today are equipped with the sense of sight, smell, hearing, taste and touch through microsensors. They are also capable of physical exertion through small muscles called microactuators. These new capabilities open wide fields of imagination and important specific applications.展开更多
Vacuum ultraviolet(VUV)light sensing shows great potential applications in the space science,materials,biophysics,and plasma physics.In this work,an all-optical detection method is proposed for VUV sensing by construc...Vacuum ultraviolet(VUV)light sensing shows great potential applications in the space science,materials,biophysics,and plasma physics.In this work,an all-optical detection method is proposed for VUV sensing by constructing an optical fiber-end Fabry-Pérot interferometer based on a single aluminum nitride(AlN)microwire.Compared with the traditional electrical devices,this all-optical detection method overcomes the difficulties like the fast response and electromagnetic interference immunity in detecting VUV bands at the present stage,and improves the response speed.The proposed device shows the excellent performance of VUV detection,with the static sensitivity of 1.03 nm/(W·cm^(-2)),response rise time of down to 10μs,and decay time of 0.64 ms.Beneficial from the excellent radiation resistance of AlN microwires and UV resistance of silica fibers,the proposed device is expected to have the good stability and potential applications in the fields of the solar physics and space exploration.展开更多
Since high efficiency and zero-carbon emission,hydrogen,as a clean energy carrier,is potentially an alternative fuel.Unfortunately,hydrogen is a gas with a high diffusion coefficient,wide explosion limit,and low ignit...Since high efficiency and zero-carbon emission,hydrogen,as a clean energy carrier,is potentially an alternative fuel.Unfortunately,hydrogen is a gas with a high diffusion coefficient,wide explosion limit,and low ignition energy.Thus,to ensure the safe use of hydrogen,accurate and rapid monitoring of hydrogen leakage and abnormal concentration change must be addressed immediately,which is a critical scientific and technical problem.Therefore,we propose an optics-mechanics coupling fiber hydrogen sensor without electricity-related hazard factors.This proposed fiber hydrogen sensor is constructed by combining optics-mechanics coupling,specific adsorption of hydrogen to the surface of palladium(Pd),and Fabry-Pérot(F-P)interference mechanism;the optics-mechanics coupling is aroused by hydrogen-induced stress in the suspended Pd film,which functions as an F-P resonator mirror and a hydrogen-sensitive material.According to this configuration and principle,we achieve efficient and high-selective hydrogen detection at room temperature.This optics-mechanics coupling-based fiber hydrogen sensor is characterized by the high sensitivity(0.397 nm/1%),extensive dynamic range(0.5%–3.5%),8 s response time,and 16 s recovery time.Hence,as an intrinsically safe hydrogen sensor with the high sensitivity and quick response,this optics-mechanics coupling-based fiber hydrogen sensor can be widely used in the hydrogen energy industry chain for rapid and high-performance hydrogen detection.展开更多
Cantilevers in microelectromechanical systems have the advantages of non-labeling,real-time detection,positioning,and specificity.Rectangular solid,rectangular hollow,and triangular microcantilevers were fabricated on...Cantilevers in microelectromechanical systems have the advantages of non-labeling,real-time detection,positioning,and specificity.Rectangular solid,rectangular hollow,and triangular microcantilevers were fabricated on an optical fiber tip via two-photon polymerization.The mechanical properties were characterized using finite element simulations.Coating the microcantilever with a palladium film enabled high sensitivity and rapid hydrogen detection.The shape of the cantilever determines the sensitivity,whereas the thickness of the palladium film determines the response time.Additional microelectromechanical systems can be realized via polymerization combined with optical fibers.展开更多
基金supported by the State Key Laboratory of Advanced Optical Communication Systems and Networks,China
文摘By using a graded-index multimode fiber （GI-MMF） with a relatively flat index profile and high refractive index of the fiber core, a microextrinsic fiber-optic Fabry Prot interferometric （MEFPI） strain sensor is fabricated through chemical etching and fusion splicing. Higher reflectance of the microcavity is obtained due to the less-curved inner wall in the center of the fiber core after etching and higher index contrast between the GI-MMF core and air. The maximum reflection of the sensor is enhanced 12 dB than that obtained by etching of the Er- or B-doped fibers. High fringe contrast of 22 dB is obtained. The strain and temperature responses of the MEFPI sensors are investigated in this experiment. Good linearity and high sensitivity are achieved, with wavelength-strain and wavelength-temperature sensitivities of 7.82 pm/με and 5.01 pm/°C, respectively.
基金National Natural Science Foundation of China(Nos.6207509,U2001601,61975084)the Jiangsu Provincial Key Research and Development Program(Nos.BE2022079,BE2022055-2)。
文摘This paper proposes a Mach Zehnder/Fabry Perot Interferometer(MZI/FPI)fiber sensor based on Single-mode Fiber(SMF)and Hollow-core Fiber(HCF),which has high sensitivity to temperature and lateral loads.The proposed device consists of two single-mode fiber cones formed by manually controlling the fusion splicer and an air cavity formed by fusing a section of hollow-core fiber.The structure of the sensor is a double cone cascaded air cavity.At the beginning of the design,we compared the basic transmission spectra of single cone structure and double cone structure experimentally,and therefore chose to use double cone structure and air cavity cascade.Light undergoes its first reflection at the first interface between the single-mode fiber and the air cavity structure,and its second reflection at the second interface between the air cavity structure and the single-mode fiber.The two reflected light waves produced by the two reflections form FP interference,which can be used to measure lateral loads.The transmitted light is excited through the first cone,and a portion of the core mode light is excited to the cladding,while another portion of the core mode light continues to propagate in the core.The light couples at the second cone,and the cladding mode light couples back into the core,forming MZ interference with the core mode light,which can be used to measure temperature.The use of hollow-core fiber to form an air cavity has little effect on transmitted light,while avoiding the problem of crosstalk in dual parameter measurements.By designing temperature and lateral load experiments,this article verifies the sensitivity characteristics of this sensor to temperature and lateral loads.A significant redshift phenomenon was observed in the temperature experiment.A significant redshift phenomenon also occurred in the lateral load experiment.Through wavelength demodulation,the experimental results show that the wavelength sensitivity of the sensor to temperature is 56.29 pm/℃in the range of 30℃to 80℃.The wavelength sensitivity of the sensor to lateral loads is 1.123 nm/N in the range of 0~5 N.In addition,we have prepared multiple sets of fiber optic sensors with this structure and conducted repeated experiments to verify that the sensing performance of this structure of fiber optic sensors for temperature and lateral load is relatively stable.Also,the different waist diameters of cones will have a certain impact on the transmission spectrum of MZ,while the length of the air cavity will also have a certain impact on the reflection spectrum of FP.This article lists some fiber optic sensors for dual parameter measurement of temperature and lateral load.Compared with the listed sensors,the fiber optic sensor proposed in this article has better sensitivity to temperature and lateral load.And the fiber optic sensor proposed in this article has a simple manufacturing process,low production cost,and good performance,which has certain prospects in scientific research and industrial production.
文摘The last half-century was transformed by the electronic revolution that essentially reproduced the human brain and its computing capacity on a chip. But over time, scientists have realized that something was missing to give life, so to speak, to the small chip with a brain： One needed to awaken its senses and develop its muscles! This challenge was solved through MEMS （micro electro mechanical systems）. Indeed, MEMS today are equipped with the sense of sight, smell, hearing, taste and touch through microsensors. They are also capable of physical exertion through small muscles called microactuators. These new capabilities open wide fields of imagination and important specific applications.
基金supported by the National Key Research and Development Program of China(Grant Nos.2022YFE0111400 and 2022YFB3605303)Science and Technology Innovation Commission of Shenzhen(Grant Nos.JCYJ20200109114001806,JCYJ20220818095615034,and JCYJ20210324095400002)+1 种基金Shenzhen Key Laboratory of Ultrafast Laser Micro/Nano Manufacturing(Grant No.ZDSYS20220606100405013)Natural Science Foundation of Guangdong Province(Grant No.2023A1515012893).
文摘Vacuum ultraviolet(VUV)light sensing shows great potential applications in the space science,materials,biophysics,and plasma physics.In this work,an all-optical detection method is proposed for VUV sensing by constructing an optical fiber-end Fabry-Pérot interferometer based on a single aluminum nitride(AlN)microwire.Compared with the traditional electrical devices,this all-optical detection method overcomes the difficulties like the fast response and electromagnetic interference immunity in detecting VUV bands at the present stage,and improves the response speed.The proposed device shows the excellent performance of VUV detection,with the static sensitivity of 1.03 nm/(W·cm^(-2)),response rise time of down to 10μs,and decay time of 0.64 ms.Beneficial from the excellent radiation resistance of AlN microwires and UV resistance of silica fibers,the proposed device is expected to have the good stability and potential applications in the fields of the solar physics and space exploration.
基金supported by the National Natural Science Foundation of China(Grant Nos.62275039,62171076,and 61727816)Fundamental Research Funds for the Central Universities,China(Grant No.DUT24MS022)State Key Laboratory of Advanced Optical Communication Systems and Networks,China(Grant No.2022GZKF001).
文摘Since high efficiency and zero-carbon emission,hydrogen,as a clean energy carrier,is potentially an alternative fuel.Unfortunately,hydrogen is a gas with a high diffusion coefficient,wide explosion limit,and low ignition energy.Thus,to ensure the safe use of hydrogen,accurate and rapid monitoring of hydrogen leakage and abnormal concentration change must be addressed immediately,which is a critical scientific and technical problem.Therefore,we propose an optics-mechanics coupling fiber hydrogen sensor without electricity-related hazard factors.This proposed fiber hydrogen sensor is constructed by combining optics-mechanics coupling,specific adsorption of hydrogen to the surface of palladium(Pd),and Fabry-Pérot(F-P)interference mechanism;the optics-mechanics coupling is aroused by hydrogen-induced stress in the suspended Pd film,which functions as an F-P resonator mirror and a hydrogen-sensitive material.According to this configuration and principle,we achieve efficient and high-selective hydrogen detection at room temperature.This optics-mechanics coupling-based fiber hydrogen sensor is characterized by the high sensitivity(0.397 nm/1%),extensive dynamic range(0.5%–3.5%),8 s response time,and 16 s recovery time.Hence,as an intrinsically safe hydrogen sensor with the high sensitivity and quick response,this optics-mechanics coupling-based fiber hydrogen sensor can be widely used in the hydrogen energy industry chain for rapid and high-performance hydrogen detection.
基金the National Natural Science Foundation of China(NSFC)(62122057,62075136)the Natural Science Foundation of Guangdong Province(2018B030306003,2020A0505100066)the Science and Technology Innovation Commission of Shenzhen(JCYJ20200109114001806,RCYX20200714114524139,JCYJ20180507184503128).
文摘Cantilevers in microelectromechanical systems have the advantages of non-labeling,real-time detection,positioning,and specificity.Rectangular solid,rectangular hollow,and triangular microcantilevers were fabricated on an optical fiber tip via two-photon polymerization.The mechanical properties were characterized using finite element simulations.Coating the microcantilever with a palladium film enabled high sensitivity and rapid hydrogen detection.The shape of the cantilever determines the sensitivity,whereas the thickness of the palladium film determines the response time.Additional microelectromechanical systems can be realized via polymerization combined with optical fibers.
