Rare earth sesquisulfides have drawn growing attention in photoelectric applications because of their excellent electronic and photoelectric properties upon compression.We investigate the structural,electrical,and pho...Rare earth sesquisulfides have drawn growing attention in photoelectric applications because of their excellent electronic and photoelectric properties upon compression.We investigate the structural,electrical,and photoelectric properties of Tm_(2)S_(3) under high pressure through electrical impedance,UV-vis absorption,Raman spectroscopy,x-ray diffraction,and photoelectric measurements.It is found that δ-Tm_(2)S_(3) transforms into high-pressure𝛼-phase around 5GPa,accompanied by a substantial reduction in atomic distance,bandgap,and resistivity.Consequently,the photocurrent density and responsivity of Tm_(2)S_(3) exhibit dramatic increase behavior,achieving five orders of magnitude enhancement in α-phase compared with the initial δ-Tm_(2)S_(3).Moreover,α-phase maintains a high photocurrent responsivity of three orders of magnitude after unloading.This work demonstrates significant enhancement of the photoelectric properties of Tm_(2)S_(3) by applying pressure,which paves the way for improving the performance of future photoelectric devices.展开更多
文摘针对常规兵器靶场试验、部队训练及演习过程中非爆弹定位困难的问题,介绍了一种采用低成本声学传感器的终点弹道未爆弹探测技术。根据弹着区范围,布置若干声学传感器,保证其测量范围覆盖整个弹着区。对于每一个声学传感器采集到的气动噪声及落地声信号,执行以下计算步骤:采用快速傅里叶变换与拉普拉斯小波分析技术进行声学信号的降噪与增强;采用短时能量、短时幅度以及短时过零率进行气动噪声与落地声端点检测;采用小波包分析技术提取降噪增强后声学信号的特征;采用基于最小距离的阈值准则进行终点弹道气动噪声及落地声的识别。靶场试验未爆弹落点粗定位结果显示,文中所提技术可用于未爆弹落地点定位,定位精度可达10 m.
基金mainly supported by the National Natural Science Foundation of China(Grant Nos.52288102,52090020,52022089,and 52372261)。
文摘Rare earth sesquisulfides have drawn growing attention in photoelectric applications because of their excellent electronic and photoelectric properties upon compression.We investigate the structural,electrical,and photoelectric properties of Tm_(2)S_(3) under high pressure through electrical impedance,UV-vis absorption,Raman spectroscopy,x-ray diffraction,and photoelectric measurements.It is found that δ-Tm_(2)S_(3) transforms into high-pressure𝛼-phase around 5GPa,accompanied by a substantial reduction in atomic distance,bandgap,and resistivity.Consequently,the photocurrent density and responsivity of Tm_(2)S_(3) exhibit dramatic increase behavior,achieving five orders of magnitude enhancement in α-phase compared with the initial δ-Tm_(2)S_(3).Moreover,α-phase maintains a high photocurrent responsivity of three orders of magnitude after unloading.This work demonstrates significant enhancement of the photoelectric properties of Tm_(2)S_(3) by applying pressure,which paves the way for improving the performance of future photoelectric devices.
