基于双远心镜头的空间分辨PDV探头研制

Design of Spatial Resolution PDV Probe Based on Double Telecentric Lens

为了在材料动力学实验和结构响应研究中实现对平面靶约5 mm范围内多点速度的同时测量,基于光纤密排阵列和双远心镜头研制了一种与光子多普勒测速仪配套使用的具备空间分辨能力的激光发射接收探头。介绍了探头的光学设计和结构设计,并进行了装调和测试。输出光斑特性测试结果表明,探头垂轴放大率与设计值吻合,聚焦位置处最小光斑直径为109μm,最大为202μm。探头对漫反射靶的接收效率测试结果表明,探头中各光纤互不串扰,靠近中心的光纤的接收效率较大,而两侧的偏小。

In order to simultaneously measure the multi-point velocity of a plane target in the range of 5 mm in material dynamics experiments or structural response research,a laser transmitting and receiving probe with spatial resolution for photonic Doppler velocimetry is developed based on the dense fiber array and double telecentric lens.The optical design and structural design are described,and the installation and testing of the probe are performed.The test results of output spot characteristics show that the vertical axis magnification of the probe is consistent with the design value.The minimum diameter of the spot at the focusing position is 109μm and the maximum is 202μm.The test results of the receiving efficiency of the probe to the diffuse reflection target show that each fiber in the probe is not crosstalk,and the receiving efficiency of the fiber near the center is large,while that of the two sides is small.