This paper suggests a new optical system for measuring shock wave characteristic that is installed in a shock tube. This shock tube has an innovative pneumatic rapid opening valve designed to open from the center of the tube to the corners. In this measurement system, a plate has placed in front of the shock wave. The plate displacement has measured during a collision by measuring the amount of light reflectance change. Then these optical data have converted to a voltage. After calibration with the help of a piezoresistive sensor in the shock tube and showing its voltage-pressure relation, the shock wave pressure diagram has been demonstrated, which contains the wave’s positive and negative parts. Also, the delay time in this system is investigated. In addition to the shock wave velocity, the system can measure the timing and velocity opening of the pneumatic valve replaced in the shock tube. The velocity is also calculated theoretically and compared with the experimental results. The unique feature of this automatic valve is its opening from the center of the tube to the corners, like a camera aperture, which is best suited for opening the valve and resulting wave uniformity. Also, the alignment of the driver and the driven prevented gas perturbation due to the redirection or rotation. This problem has seen in most recently used valves. Finally, the planar shock wave formation has been investigated.

中文翻译：

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在新设计的无隔膜冲击管中使用新型光学传感器测量冲击波压力和速度

本文提出了一种安装在激波管中的用于测量激波特性的新光学系统。该减震管具有创新的气动快速开启阀，设计用于从管中心到角落打开。在这个测量系统中，一块板放置在冲击波的前面。通过测量光反射变化量来测量碰撞期间的板位移。然后这些光学数据已转换为电压。借助激波管中的压阻传感器标定并显示其电压-压力关系，演示了激波压力图，其中包含波的正负部分。此外，还研究了该系统中的延迟时间。除了冲击波速度，该系统可以测量在激波管中更换的气动阀的开启时间和速度。还对速度进行了理论计算并与实验结果进行了比较。这种自动阀门的独特之处在于它从管子的中心到角落的开口，就像一个相机光圈，最适合打开阀门并产生波的均匀性。此外，驱动器和被驱动器的对齐防止了由于重定向或旋转引起的气体扰动。这个问题在最近使用的阀门中已经出现。最后，对平面冲击波的形成进行了研究。这种自动阀门的独特之处在于它从管子的中心到角落的开口，就像一个相机光圈，最适合打开阀门并产生波的均匀性。此外，驱动器和被驱动器的对齐防止了由于重定向或旋转引起的气体扰动。这个问题在最近使用的阀门中已经出现。最后，对平面冲击波的形成进行了研究。这种自动阀门的独特之处在于它从管子的中心到角落的开口，就像一个相机光圈，最适合打开阀门并产生波的均匀性。此外，驱动器和被驱动器的对齐防止了由于重定向或旋转引起的气体扰动。这个问题在最近使用的阀门中已经出现。最后，对平面冲击波的形成进行了研究。