延时法测量条纹相机μs档扫描非线性

为实现μs档条纹相机扫描非线性标定,建立了基于延时可调信号源和外触发激光器的条纹相机μs档扫描非线性标定系统,弥补了标准具法的不足。系统通过延时值的递增,得到条纹相机扫描速度在全扫程的变化。系统中时间关系抖动来源主要是测试设备延时抖动和条纹相机触发延时抖动。时间抖动测试与分析显示,条纹相机延时抖动±0.6ns,测试设备延时抖动±0.3ns,系统总时间抖动±0.7ns。系统时间抖动会造成最终时间轴信息的起伏。大量数值模拟分析表明,时间轴起伏对系统时间抖动的影响±2ns,在可以接受的范围内。因此,该系统能够胜任条纹相机μs扫程时间信息的测量标定。

Sweep nonlinearity measurement of streak camera working at microsecond level

To measure the sweep nonlinearity of streak camera working at microsecond level, the system based on delay tunable signal source is developed and analyzed. The system is mainly constituted of a delay tunable signal source and a triggered short pulse laser. The short pulse laser is triggered by the delay tunable signal source. The streak camera records the laser pulses appearing at different channel of the streak camera as the signal sources delay value varies. The relation between the laser pulse peak channel and signal source delay value is fitted by the polynomial method. The polynomial is a denotation of the correlation between time and each channel. Sweep velocity and sweep nonlinearity are calculated with the polynomial. The fluctuation of the sweep nonlinearity measurement system is 0.7 ns. The fluctuation of the system causes the fluctuation of the measured sweep velocity through curve fitting process. The process is simulated by adding a Gaussian noise to the delay-channel raw data points. The mass simulation shows that the fluctuation of the delay-channel correlation is less than 2 ns. The sweep nonlinearity measurement system can also be used for calibrating streak camera working at several hundred nanosecond level.