A Method for Pulsed Scannerless Laser Imaging Using Focal Plane Array

摘要

Laser imaging techniques have advantages for EMI (Electro Magnetic Interference) immunity and abundant image information. This contribution describes the research activity on the scannerless laser imaging detection technique using direct detection aimed at laser fuze applications. The technique using a pulsed laser to illuminate the target and a focal plane array can be used as a receiver. The range information is achieved by means of a direct time of light measurement. Information about the reflectivity of the target is gathered by recording the amplitude of the received pulse. In this paper a high-repetition-frequency, narrow pulse semiconductor laser floodlight emitting system is designed; corresponding optics is used to generate the homogenously illuminated FOI (field of illumination). The echo of laser is collected by receiving optical system fed to focal plane array. Some experiments were done with the emitting and receiving systems that had been designed. Experiments show the validity and rationality of this method. The scannerless structure is robust and provides instantaneous snapshot-type imaging. Avoiding any moving mechanical parts, scannerless laser imaging system have distinct characteristics such as small, compact, high frame rate, wide field of view and high reliability. It is an optimal approach to realize laser imaging fuze.