Abstract: With the rapid development of electronics, information, materials, optics, and mechanical disciplines, non-imaging optics laser detection technology has received more and more attention in recent years. High accuracy and non-contact measurement characteristics make laser detection optical systems widely used in laser ranging, laser radar, and laser guidance. In this paper, a novel distributed aperture semi-active laser detection system is proposed to obtain the target angle information according to the principle of the four-quadrant detector and the characteristics of the image beam fiber. The system consists of four optical systems that meet the telecentric light path of the image square, a 4×1 beam fiber, and a detector. By setting up a system prototype, quantitatively measure the linear range of the semi-active laser detection system and the measurement error.The experimental results show that the system has a linear field of view of ±12°, and the measured value is close to the ideal curve of the linear region, which satisfies the design specifications of the optical system.

Key words: non-imaging optical system design, four quadrant detector, image beam fiber, equivalent light spot