基于环形结构光的药室容积测量技术

Volume measurement for powder chamber based on ring structured light

药室容积是影响内外弹道性能的重要参数之一。传统的测量方法具有效率较低、精度不高等缺点。针对该容积测量问题,设计了一种新的测量系统,该系统主要由一个环形激光投射器和CCD相机组成。投射器用于激发同药室内表面相交的圆锥形光曲面,而相机用于获取该光曲面同药室内表面相交形成的截面轮廓图像。当沿着药室轴线方向连续地、以足够高的采样密度获取多个类似的轮廓之后,可以得到药室完整的三维离散数据。由于同弹体的摩擦及火药的燃烧,药室的终点不断变化,针对该问题,提出了一种新的虚拟量规的方法,通过计算理想模型同实测数据的相似性确定药室的终点。通过对实际火炮的实验验证了该方法的可行性和精度。

The volume of the powder chamber is a crucial parameter affecting the interior and exterior ballistic performance. Conventional methods have the disadvantages of inefficiency and inaccuracy. An innovative system that mainly consists of a ring structured light projector and a CCD camera is designed to deal with the volumetric issue. The projec- tor emits a conical light surface, which intersects with the inner surface of the chamber, and the camera is used to capture the image of the intersection representing the chamber section contour. With a series of such contours obtained from consecutive and sufficiently dense axial positions, it is able to get the complete 3D discrete data of the chamber. In regard to the change of the end of the powder chamber caused by the friction with the shot and combustion of the powder, a novel virtual gauge method is promoted to decide the end point by calculating the similarity of an ideal model with the measured data. The feasibility and accuracy of the technology is testified by experiment with real gun.