一种新型全光纤弹速测量系统的研制

Development of a novel all fiber optical system for measuring projectile velocity

研制了一种新型的利用激光光束反射原理的全光纤弹速测量系统。该系统采用了全光纤结构和光纤耦合器等无源器件,以输出光功率1mW, 工作波长1300nm的半导体激光器作为测试系统的光源,用光纤耦合器进行分光,实现了在一根光纤中同时传输光源和接受目标反射的信号光,避免了复杂的调节和准直过程。该系统结构简单、可靠性高,利用它,成功地测量了霍普金森杆发射的子弹速度,结果表明其速度测量相对不确定度小于1%。

A novel All Fiber Optical Beam Reflectance (AFOBR) system for measuring project velocity in gas-gun is developed. An all fiber optical structure and optical fiber couplers are used in the system. Through using a semiconductor laser-diode with output light power of 1mW and operating wavelength of 1300nm as light source of the test system and light splitting by optical fiber coupler, simultaneously transmitting light beam and receiving signal light beam reflected from target by single optical fiber is implemented. This method avoids complicated adjustment and collimation process. Compared with other similar projectile velocities measurement systems, this system is not only cheap, simple but also reliable and accurate. Projectile velocity measurements are conducted successfully on Hopkinson bar, and the results show that its relative uncertainty of velocity measurement is less than 1%.