CAJ | 학술논문

在直接探测测风激光雷达中,多普勒频移由高分辨率的Fabry-Perot标准具检测得到.指出了激光频率与标准具腔长随环境温度的变化导致测量误差增大的问题,提出了频率跟踪的解决方案.使用散射光纤对激光脉宽进行扩展,在双通道标准具的基础上增加专用于频率跟踪的通道,使用光电倍增管检测光强,设计制作了基于采样的频率跟踪电路.仿真实验表明,该方案能够实现标准具腔长与激光发射频率的动态跟踪.
재직접탐측측풍격광뢰체중,다보륵빈이유고분변솔적Fabry-Perot표준구검측득도.지출료격광빈솔여표준구강장수배경온도적변화도치측량오차증대적문제,제출료빈솔근종적해결방안.사용산사광섬대격광맥관진행확전,재쌍통도표준구적기출상증가전용우빈솔근종적통도,사용광전배증관검측광강,설계제작료기우채양적빈솔근종전로.방진실험표명,해방안능구실현표준구강장여격광발사빈솔적동태근종.
A Fabry-Perot etalon with high spectral resolution is used as the frequency discriminator in the direct detection wind lidar.The laser frequency and the spacing of cavity drift as the temperature changes,which will cause the increasing of error.A frequency tracking solution is proposed.A backscatter fiber is used to expand the width of laser pulse.A locking filter is added to dual F-P etalon.Photo Multiplier Tube (PMT) is used to detect the intensity of light and a frequency tracking circuitry is designed.The results of simulation experiment indicated that,the spacing of cavity is able to lock to the laser by this method.