Ranging Accuracy Detection System Of Laser Range Finder Based On Fiber Delay Line

Photo-electricity fire control system is a kind of generic terms, that using photo-electric sensor to control the shooting automatic weapons. It has been widely used in all kinds of weapon systems. To ensure the hit accuracy and the quick reaction capability of the fire control system, the concept of the accompanying security system was proposed in the 80 s in China. After thirty years of research, it has been fruitful. But, as the most important component of the fire control system, the appropriative accompanying security system of the laser range finder has not been completely exploited.Under the special requirement of the accompanying security system, this paper, using the optical alignment and the optical fiber delay line (VFDL) technology, designs a ranging accuracy testing system for the laser range finder. The system chooses multimode optical fiber as transmission system to meet technical requirements of the simulation optical path. A ’former convex type’ double-plate laser coupling lens is designed with large relative aperture. After comprehensively considering the working principle and structure of laser range finder, this paper designs an incident optical axis alignment system (IOAAS) and the corresponding software, using the pulse light capture technology by CCD. Combined with IOAAS, the output port, which is on the basis of parallel light pipe axis calibration technology, realizes the multi beam axes collimation of the laser range finder. Considering the damage threshold of the photosensitive parts, a kind of neutral density filters is used as the attenuation system. And this paper proves the feasibility of the scheme, after the experiments of VFDL and IOOAAS.In order to correct the system parallelism itself, an experiment of optical axis self-calibration is designed, and it gets a good result. To accurately demarcate the fiber length, this paper, using the method of MFQ by single pulse, makes several experiments, and verify the feasibility of the system. Finally, the detection precision of the system is analyzed. The research work of this paper provides a strong support for the subsequent development of system.