基于调制白光照射的锁定成像

摘要

Laser lock-in imaging technology is a method for obtaining target image from very powerful background lights based on the combination of phase discrimination of weak signal detection with the optical, which is applied in industrial measurement. A lock-in imaging based on modulated white LED is put forward based on the phase technology of laser lock-in imaging. The white LED controlled by voltage modulation is used to illuminate interested target area where there are strong lights, and a color CCD image sensor is employed to take image synchronically. Then we adopt phase discrimination to handle the component of image’s RGB respectively. The experimental results show that lock-in image based on white LED is capable of getting image clearly from very powerful background light, and expands the range of application. The video monitoring, industrial measurements and other fields will have broad application and practical value.%激光锁定成像是一种基于光学与弱信号检测中的鉴相原理相结合来获取强背景光下目标图像的方法。本文基于激光锁定成像中的鉴相技术提出了一种基于调制白光LED的锁定成像。采用电压调制白光LED照射目标区域，并同步控制彩色CCD相机获取图像。分别对图像RGB三个分量运用鉴相技术处理。实验表明，基于白光LED锁定成像能够很好的获取强背景光下的目标图像。