反射式大面积光幕测速装置研究

Research on velocity measurement device with large area light screens based on reflection

介绍了一种基于反射式的大面积光幕测速装置,靶面的横向距离可达6 000mm,避免了现有弹丸测速区截装置测试区域小、安全距离近、容易损坏测速装置等缺点。该装置由激光光学系统、回归式反光材料(反光膜)及其固定支架、反射镜、光电探测器与处理电路组成。将激光光源投射到另一端的反光膜上,形成光幕探测区,当弹丸或破片穿过光幕时,引起光通量变化,通过测时仪或数据采集系统即可获得过靶速度。用7.62mm枪弹经与高精度的框架式800mm×800mm的光幕靶进行了比对试验,结果满足测量精度要求。试验证明:该装置具有靶面大、精度高、使用维护方便,成本低等显著优点,不仅能进行常规的弹丸速度测试,同时,也适用于破片、弹幕武器等的速度测量。

A speed-measuring device with large area light screen is introduced. The horizontal distance of light screen is 6 000 mm, which avoids the shortcomings of small testing area of bullet speed testing device, short safe distance and easy-breaking. This device is composed of laser optical system, regression-reflective material （ retroreflective sheeting）, fixing frame, reflective mirror, photoelectric detector and processing circuit. The laser is projected to the retro-reflective sheeting on the other side to form a light screen detecting area. The light flux is changed when bullet or debris with high speed pass through the light screens, and the passing target speed can be achieved by time-measuring device or data acquisition system. A comparing experiment has been done by using 7.62 mm projectile and mature frame style 800 mm ×800 mm light screen, and the result can meet the precision requirement. The experimental results indicate that the device has distinguish advantages such as large target surface area, high precision, convenient for using and maintenance, low-cost and so on. The device can be also used for velocity measurement of large caliber projectile and projectile fragments.