强电磁环境下光纤测速系统设计

Design of Optical Fiber Velocity Measurement System Under Strong Electromagnetic Environment

强电磁环境下传统电子测试设备工作时,由于干扰信号会引入信号回路中,导致测试设备信噪比差甚至无法正常工作,针对上述问题,提出了一种基于光纤化光路形成激光光幕的测速方法。研究了采用半导体激光光源、鲍威尔棱镜及多模光纤耦合形成激光光幕的构建方法,并通过仿真优化其关键参数,进行了强电磁环境下某型号武器的现场试验。试验结果表明:在强电磁环境下,该测试系统操作简单、稳定可靠,达到抗电磁干扰的需求;在非电磁环境下,与传统接触式断靶测速系统相比较误差优于0.2%。

For the traditional electronic test equipment under strong electromagnetic environment,the interference signal was introduced into the signal loop,which causes the signal-to-noise ratio of the test equipment to be poor or even unable to work normally.In this paper,a velocity measurement method based on fiber-optic optical path to form a laser light screen was proposed.The construction method of laser light screen composed of semiconductor laser source,Powell prism and multimode fiber coupling was studied and the key parameters were optimized by simulation.The field test of a certain type of weapon under strong electromagnetic environment were carried out.The test results show that in the strong electromagnetic environment,the test system is simple,stable and reliable,and meets the requirements of anti-electromagnetic interference.In the non-electromagnetic environment,compared with the traditional contact-type target velocity measurement system,the error is better than 0.2%.