Piezoelectric energy harvesting is considered as an ideal power resource for low-power consumption gadgets in vibrational environments.The energy extraction efficiency depends highly on the interface circuit,and shoul...Piezoelectric energy harvesting is considered as an ideal power resource for low-power consumption gadgets in vibrational environments.The energy extraction efficiency depends highly on the interface circuit,and should be highly improved to meet the power requirements.The nonlinear interface circuits in discrete components have been extensively explored and developed with the advantages of easy implementation,stable operation,high efficiency,and low cost.This paper reviews the state-of-the-art progress of nonlinear piezoelectric energy harvesting interface circuits in discrete components.First,the working principles and the advantages/disadvantages of four classical interface circuits are described.Then,the improved circuits based on the four typical circuits and other types of circuits are introduced in detail,and the advantages/disadvantages,output power,efficiency,energy consumption,and practicability of these circuits are analyzed.Finally,the future development trends of nonlinear piezoelectric energy harvesting circuits,e.g.,self-powered extraction,low-power consumption,and broadband characteristic,are predicted.展开更多
A 32-channel charge-sensitive amplifier(CSA)is designed for fast timing in the delay-line readout of a parallel plate avalanche counter(PPAC)array.It is realized on a PCB with operational amplifiers and other discrete...A 32-channel charge-sensitive amplifier(CSA)is designed for fast timing in the delay-line readout of a parallel plate avalanche counter(PPAC)array.It is realized on a PCB with operational amplifiers and other discrete components.Each channel consists of an integrator,a pole-zero cancellation net,and a linear amplification stage,which can be adapted to accommodate either positive or negative input signals.The RMS equivalent input noise charges are 3.3 fC,the conversion gains are approximately±2 mV∕fC,and the intrinsic time resolution reaches 32 ps.In the prototype PPAC application,the CSA performs as well as the commercial FTA820A amplifier,providing a position resolution as good as 0.17 mm,and exhibiting reliable stability during several hours of continuous data acquisition.展开更多
Structured light beams have significant application value in fields like optical communication,microscopic imaging,and biomedicine due to their unique spatial field distribution characteristics.However,traditional str...Structured light beams have significant application value in fields like optical communication,microscopic imaging,and biomedicine due to their unique spatial field distribution characteristics.However,traditional structured beam generation systems based on discrete optical components have inherent drawbacks such as strict alignment requirements and poor tunability,which severely limit their practical applications.This paper proposes a new method for broadband bifunctional generation of structured beams based on fiber-integrated metasurfaces:by integrating spin-multiplexing bifunctional phase metasurfaces with the end faces of optical fibers,broadband sub-wavelength Bessel beams and focused vortex beams were,respectively,generated on demand in an all-fiber configuration when different circularly polarized light was input.The experimental measurements showed that the transmission characteristics of the generated beams were highly consistent with the numerical simulation results.Our scheme fully exploits the flexible waveguide(bendable)advantage of fibers,breaking through the constraint of poor optical path tunability in traditional“hard connection”systems due to strict alignment requirements.Since the implemented device simultaneously possesses broadband operation,sub-wavelength-scale field control,and spin-multiplexing characteristics,this study provides a new paradigm for multidimensional and multifunctional dynamic light field manipulation,and it holds significant application potential in fields such as fiber-optic imaging and fiber sensing.展开更多
基金the National Natural Science Foundation of China(Nos.51805298 and 12072267)the Natural Science Foundation of Shandong Province of China(No.ZR2019PEE015)+3 种基金the Fundamental Research Funds for the Central Universities of China(No.2019ZRJC006)the 111 Project of China(No.BP0719007)the Innovation Capability Support Plan of Shaanxi Province of China(No.2020KJXX-021)the Young Scholars Program of Shandong University,Weihai of China(No.20820201004)。
文摘Piezoelectric energy harvesting is considered as an ideal power resource for low-power consumption gadgets in vibrational environments.The energy extraction efficiency depends highly on the interface circuit,and should be highly improved to meet the power requirements.The nonlinear interface circuits in discrete components have been extensively explored and developed with the advantages of easy implementation,stable operation,high efficiency,and low cost.This paper reviews the state-of-the-art progress of nonlinear piezoelectric energy harvesting interface circuits in discrete components.First,the working principles and the advantages/disadvantages of four classical interface circuits are described.Then,the improved circuits based on the four typical circuits and other types of circuits are introduced in detail,and the advantages/disadvantages,output power,efficiency,energy consumption,and practicability of these circuits are analyzed.Finally,the future development trends of nonlinear piezoelectric energy harvesting circuits,e.g.,self-powered extraction,low-power consumption,and broadband characteristic,are predicted.
基金supported by the National Natural Science Foundation of China(Nos.U2167202,12225504,12005276)the Natural Science Foundation of Shandong Province(No.ZR2024QA172)the Fundamental Research Funds of Shandong University.
文摘A 32-channel charge-sensitive amplifier(CSA)is designed for fast timing in the delay-line readout of a parallel plate avalanche counter(PPAC)array.It is realized on a PCB with operational amplifiers and other discrete components.Each channel consists of an integrator,a pole-zero cancellation net,and a linear amplification stage,which can be adapted to accommodate either positive or negative input signals.The RMS equivalent input noise charges are 3.3 fC,the conversion gains are approximately±2 mV∕fC,and the intrinsic time resolution reaches 32 ps.In the prototype PPAC application,the CSA performs as well as the commercial FTA820A amplifier,providing a position resolution as good as 0.17 mm,and exhibiting reliable stability during several hours of continuous data acquisition.
基金Natural Science Foundation of Guangxi(2024GXNSFDA010062)Guangxi Science and Technology Program Project(AD25069073)+3 种基金National Natural Science Foundation of China(62205079,62125503,62261160388)Innovation Project of Guangxi Graduate Education(YCSW2024332)Natural Science Foundation of Hubei Province of China(2023AFA028)Hubei Optical Fundamental Research Center(HBO2025TQ004)。
文摘Structured light beams have significant application value in fields like optical communication,microscopic imaging,and biomedicine due to their unique spatial field distribution characteristics.However,traditional structured beam generation systems based on discrete optical components have inherent drawbacks such as strict alignment requirements and poor tunability,which severely limit their practical applications.This paper proposes a new method for broadband bifunctional generation of structured beams based on fiber-integrated metasurfaces:by integrating spin-multiplexing bifunctional phase metasurfaces with the end faces of optical fibers,broadband sub-wavelength Bessel beams and focused vortex beams were,respectively,generated on demand in an all-fiber configuration when different circularly polarized light was input.The experimental measurements showed that the transmission characteristics of the generated beams were highly consistent with the numerical simulation results.Our scheme fully exploits the flexible waveguide(bendable)advantage of fibers,breaking through the constraint of poor optical path tunability in traditional“hard connection”systems due to strict alignment requirements.Since the implemented device simultaneously possesses broadband operation,sub-wavelength-scale field control,and spin-multiplexing characteristics,this study provides a new paradigm for multidimensional and multifunctional dynamic light field manipulation,and it holds significant application potential in fields such as fiber-optic imaging and fiber sensing.
