【摘要】 报道了采用多通道光纤延迟和光学多道分析技术采集KCl晶体瞬态冲击辐射时间分辨光谱的新方法。多光纤延时耦合器由 5条长度不等的光纤组成 ,光纤长度差决定延时时差 ,光纤出射光由透镜耦合进入多色仪 ,经色散后在面阵探测器上形成与信号光纤一一对应的光谱图形 ,经计算机处理获得该信号光的空间 时间分辨光谱。建立了实验装置 ,实现了KCl晶体冲击辐射谱时间分辨多道测量 ,时间分辨率达到 2 0ns,谱强度分辨率 1/ 18bit。更多还原

【Abstract】 In this paper, the authors reported a new method for measuring transient time-dependent spectra using multi-fiber delay coupler and optical multi-channel analysis technique. The fiber delay coupler consists of five fibers with different lengths and its time-delay between two fibers is determined by the different fiber lengths. The light beams that came from the fiber coupler were coupled by a lens system into the slit of a spectrograph and formed a spectral pattern on the focus plane of the spectrometer. A two-dimensional CCD detector convested the optical pattern into an electrical pattern, and then the transient time-dependent spectra were obtained by a personal computer. The experimental setup was constructed, and the transient time-dependent spectra were measured for KCl crystal shocked by a high speed pill. The time resolution was 20 ns, and the spectral intensity resolution reached 1/18 bit.更多还原