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Photonic Doppler velocimetry probe designed with stereo imaging

机译:采用立体成像设计的光子多普勒测速仪

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The velocity distribution of an imploding curved surface is measured with a miniature fiber-optic probe. The probe uses fiber matrix arrays that are focused onto different regions of this curved surface. A pyramid reflector deflects the interrogation onto specific regions of this curved surface. The fiber arrays record velocity along several hundred lines of sight with sub-nanosecond resolution. Reflected light from each spot on the moving surface is Doppler shifted with a small portion of this light propagating backwards through the launching fiber. The reflected light is mixed with a reference laser in a technique called Photonic Doppler velocimetry, providing continuous time records. Within the probe, seven groups of miniature optical relay lenses are grouped into a close-packed array, allowing the interrogation of seven regions of interest. A six-faceted pyramid reflector with a conical hole drilled into its center is used to direct the light beams onto different regions. To minimize back reflections, the fiber matrix arrays are index matched onto the first relay lens made of fused silica. The optical lens design minimizes the laser beam diameters and also provides excellent imaging capabilities. Therefore, two of the fiber matrix arrays are replaced by coherent bundles for stereo imaging recorded by a high-speed framing camera. This requires additional cutouts of the pyramid reflector to allow imaging overlap. Six additional 1.5 mm diameter incoherent bundles are attached to the edges of the pyramid reflector and are used for illumination. Precision metrology on the direction cosines of the trajectories is measured to satisfy environmental requirements for vibration and temperature.
机译:用微型光纤探头测量弯曲的曲面的速度分布。该探头使用的纤维矩阵阵列聚焦在该曲面的不同区域上。金字塔反射镜将询问偏转到该曲面的特定区域。光纤阵列以亚纳秒分辨率记录沿几百个视线的速度。来自移动表面上每个点的反射光会发生多普勒频移,而该光的一小部分会通过发射光纤向后传播。反射光与参比激光以一种称为光子多普勒测速法的技术混合,提供连续的时间记录。在探头内,将七组微型光学中继透镜分组为一个密排阵列,从而可以对七个感兴趣区域进行询问。六面金字塔反射器的中心钻有一个锥形孔,用于将光束引导到不同区域。为了最大程度地减少背反射,将光纤矩阵阵列与第一个由熔融石英制成的中继透镜进行折射率匹配。光学透镜设计可最大程度地减小激光束直径,并提供出色的成像功能。因此,将两个光纤矩阵阵列替换为用于高速成帧相机记录的立体成像的相干束。这需要金字塔反射器的其他切口以允许成像重叠。六个附加的直径为1.5 mm的非相干束附接到金字塔反射器的边缘,并用于照明。测量轨迹方向余弦的精确度量,以满足振动和温度的环境要求。

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