摘要
基于直接探测技术,建立了一套实验系统。试验采用激光直接探测方式,振镜在X、Y方向分别以不同的频率振动,当激光经过振镜反射后,就以X、Y方向对物体表面进行二维扫描,使用光电二极管(PIN)来探测从目标返回的能量,探测的信号经过滤波器后,按照摆动频率分开,根据反射回来的激光能量的变化,进而判断扫描物体的边缘轮廓。利用小波变换检测回波信号,可以确定回波信号的奇异点,进而确定被探测目标的边缘。
Under the supporting of direct detection technology, a rapid-scanning laser system is established, which measures the profile of target by detecting the change of return laser energy. The system steers a mirror to oscillate in X and Y directions at different frequency, so the laser beam dither in two directions scans the surface of target. PIN detects laser energy reflected from the target. By the measure, the noise can be eliminated and effective signals can be picked up When applying the wavelet transform to the experiments, a satisfying result is obtained. By this method, the edge information of target can be gotten .
出处
《光电工程》
EI
CAS
CSCD
北大核心
2007年第9期129-133,共5页
Opto-Electronic Engineering
关键词
小波分析
直接探测
回波信号
边缘检测
wavelet analysis
direct detection
echo signal
edge detection
