查看更多>>摘要:为满足激光测距仪在地形测绘、浅海岸探测等领域中的应用需求,设计了一套适用于机载激光测距仪的回波接收系统.该系统基于时间数字转换器技术测量设备与海表之间的绝对距离,结合模拟数字转换器技术测量多目标之间的相对距离,可实现对浅海岸地区海表和海底回波的接收和测量.针对激光回波信号与发射信号之间的时间间隔测量误差影响测距精度的问题,提出了一种自动参数控制算法,该算法能够根据回波信号自动调节电路增益和比较器阈值.同时,采用LM(Levenberg-Marquardt)算法对回波进行分解,有效提升了多目标回波分解的精度.通过搭建实验系统进行测试,结果显示该系统对单目标的距离测量均方根误差不大于2.89 cm,对双目标回波分解精度不高于2.56 cm.
查看更多>>摘要:Temperature is a common and significant physical quantity,particularly under harsh conditions such as a high voltage or strong electric/magnetic fields.In this study,we developed an all-fiber-optic temperature sensor based on a fiber-end microstructure doped with quantum dots(QDs).The microstructure was fabricated on a fiber tip using two-photon polymerization technology.The results show that the fluorescence intensity of the QD microstructure is reduced with an increase in temperature,and the peak position of photoluminescence exhibits a linear change in the temperature range of 26‒70℃.The developed sensor exhibits a high-temperature sensitivity of 135 pm/℃.The proposed method has enormous potential for the development of fiber-end temperature sensors.