在核脉冲信号处理中,梯形成形算法发挥着至关重要的作用,传统梯形成形算法常面临手动参数调节复杂、噪声敏感及实时性不足等问题。针对上述问题,设计了一种基于最小均方(Least Mean Squares,LMS)的双通道自适应梯形成形滤波算法,通过自...在核脉冲信号处理中,梯形成形算法发挥着至关重要的作用,传统梯形成形算法常面临手动参数调节复杂、噪声敏感及实时性不足等问题。针对上述问题,设计了一种基于最小均方(Least Mean Squares,LMS)的双通道自适应梯形成形滤波算法,通过自适应调整梯形参数实时修正成形过程中的偏差,避免了手动调节的复杂性。首先,使用MATLAB进行算法仿真验证,随后通过Verilog语言实现并部署至FPGA平台进行实测,实现了算法的高效验证和落地。该算法不仅解决了现有方法的不足,优化了梯形成形滤波算法,还对双指数脉冲信号进行了探讨,实现了复杂信号的梯形成形参数自适应调节。实验结果表明,经LMS自适应算法控制的梯形成形滤波算法,收敛时间缩减到15~25μs,动态适应范围τ提升到0.3~50μs,具有良好的噪声抑制效果以及滤波成形能力。本文研究为核脉冲信号探测提供了一种有效的方法,对相关应用具有重要的参考价值。展开更多
Formamidinium lead iodide(FAPbI_(3))perovskite exhibits an impressive X-ray absorption coefficient and a large carrier mobility-lifetime product(μτ),making it as a highly promising candidate for X-ray detection appl...Formamidinium lead iodide(FAPbI_(3))perovskite exhibits an impressive X-ray absorption coefficient and a large carrier mobility-lifetime product(μτ),making it as a highly promising candidate for X-ray detection application.However,the presence of larger FA^(+)cation induces to an expansion of the Pb-I octahedral framework,which unfortunately affects both the stability and charge carrier mobility of the corresponding devices.To address this challenge,we develop a novel low-dimensional(HtrzT)PbI_(3) perovskite featuring a conjugated organic cation(1H-1,2,4-Triazole-3-thiol,HtrzT^(+))which matches well with theα-FAPbI_(3) lattices in two-dimensional plane.Benefiting from the matched lattice between(HtrzT)PbI_(3) andα-FAPbI_(3),the anchored lattice enhances the Pb-I bond strength and effectively mitigates the inherent tensile strain of theα-FAPbI_(3) crystal lattice.The X-ray detector based on(HtrzT)PbI_(3)(1.0)/FAPbI_(3) device achieves a remarkable sensitivity up to 1.83×10^(5)μC Gy_(air)^(−1) cm^(−2),along with a low detection limit of 27.6 nGy_(air) s^(−1),attributed to the release of residual stress,and the enhancement in carrier mobility-lifetime product.Furthermore,the detector exhibits outstanding stability under X-ray irradiation with tolerating doses equivalent to nearly 1.17×10^(6) chest imaging doses.展开更多
文摘在核脉冲信号处理中,梯形成形算法发挥着至关重要的作用,传统梯形成形算法常面临手动参数调节复杂、噪声敏感及实时性不足等问题。针对上述问题,设计了一种基于最小均方(Least Mean Squares,LMS)的双通道自适应梯形成形滤波算法,通过自适应调整梯形参数实时修正成形过程中的偏差,避免了手动调节的复杂性。首先,使用MATLAB进行算法仿真验证,随后通过Verilog语言实现并部署至FPGA平台进行实测,实现了算法的高效验证和落地。该算法不仅解决了现有方法的不足,优化了梯形成形滤波算法,还对双指数脉冲信号进行了探讨,实现了复杂信号的梯形成形参数自适应调节。实验结果表明,经LMS自适应算法控制的梯形成形滤波算法,收敛时间缩减到15~25μs,动态适应范围τ提升到0.3~50μs,具有良好的噪声抑制效果以及滤波成形能力。本文研究为核脉冲信号探测提供了一种有效的方法,对相关应用具有重要的参考价值。
基金supports from the National Natural Science Foundation of China(22375220,U2001214,22471302)the Guangdong Basic and Applied Basic Research Foundation(2024B1515020101)Open Project Fund from State Key Laboratory of Optoelectronic Materials and Technologies(OEMT-2024-KF-08).
文摘Formamidinium lead iodide(FAPbI_(3))perovskite exhibits an impressive X-ray absorption coefficient and a large carrier mobility-lifetime product(μτ),making it as a highly promising candidate for X-ray detection application.However,the presence of larger FA^(+)cation induces to an expansion of the Pb-I octahedral framework,which unfortunately affects both the stability and charge carrier mobility of the corresponding devices.To address this challenge,we develop a novel low-dimensional(HtrzT)PbI_(3) perovskite featuring a conjugated organic cation(1H-1,2,4-Triazole-3-thiol,HtrzT^(+))which matches well with theα-FAPbI_(3) lattices in two-dimensional plane.Benefiting from the matched lattice between(HtrzT)PbI_(3) andα-FAPbI_(3),the anchored lattice enhances the Pb-I bond strength and effectively mitigates the inherent tensile strain of theα-FAPbI_(3) crystal lattice.The X-ray detector based on(HtrzT)PbI_(3)(1.0)/FAPbI_(3) device achieves a remarkable sensitivity up to 1.83×10^(5)μC Gy_(air)^(−1) cm^(−2),along with a low detection limit of 27.6 nGy_(air) s^(−1),attributed to the release of residual stress,and the enhancement in carrier mobility-lifetime product.Furthermore,the detector exhibits outstanding stability under X-ray irradiation with tolerating doses equivalent to nearly 1.17×10^(6) chest imaging doses.
