超高速激波三维成像

2019/01/18   下载量： 2 次

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采用立陶宛Ekspla公司的PL2231C-20, 20 Hz, 80 ps,532 nm, >15 mJ/pulse 激光器做光源，采用LaVision公司的sCMOS (2560 x 2160 pixels, 6.5 gm pixel pitch,16-bit depth) 相机。采用四波混频，相位共轭镜补偿等技术实现消除激波密度不均匀性干扰的相干成像。

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Imaging diagnostics that utilize coherent light, such as digital in-line holography, are important for object sizing and tracking applications. However, in explosive, supersonic, or hypersonic environments,gas-phase shocks impart imaging distortions that obscure internal objects. To circumvent this problem, some research groups have conducted experiments in vacuum, which inherently alters the physical behavior. Other groups have utilized single-shot flash x-ray or high-speed synchrotron x-ray sources to image through shock-waves. In this work, we combine digital in-line holography with a phase conjugate mirror to reduce the phase distortions caused by shock-waves. The technique operates by first passing coherent light through the shock-wave phase-distortion and then a phase-conjugate mirror. The phase-conjugate mirror is generated by a four-wave mixing process to produce a return beam that has the exact opposite phase-delay as the forward beam. Therefore, by passing the return beam back through the phase-distortion, the phase delays picked up during the initial pass are canceled, thereby producing improved coherent imaging. In this work, we implement phase conjugate digital in-line holography (PCDIH) for the first time with a nanosecond pulse-burst laser and ultra-high-speed cameras. This technique enables accurate measurement
of the three-dimensional position and velocity of objects through shock-wave distortions
at video rates up to 5 MHz. This technology is applied to improve three-dimensional imaging in a variety of environments from imaging supersonic shock-waves through turbulence, sizing objects through laser-spark plasma-generated shock-waves, and tracking explosively generated hypersonic fragments. Theoretical foundations and additional capabilities of this technique are also discussed.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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