重频脉冲激光的热释电探测方法

Pyroelectric Detecting of High-Repetition-Frequency Pulse Laser

以热释电探测器的工作原理为基础,研究了热释电探测器对重频脉冲激光的瞬态响应特性,建立热释电探测器单脉冲激光辐照的工作模型,分析了影响探测器频率特性的主要因素,根据材料和结构参数模拟计算了实际应用中的响应模型,重点研究了电时间常数和热时间常数对测量的影响。设计了能够提高探测器响应速度的信号检测电路并对其进行计算仿真。完成了探测器的频率响应、脉宽响应等实验测量,验证了热释电探测器用于高重频、窄脉冲激光能量测量的可行性,并给出了目前探测单元的测量范围、线性动态范围及不确定度等指标。

Based on the working principle of pyroelectric detector,the transient response characteristics to the pulse laser of the detector were researched.The working model of pyroelectric detector single pulse radiation was built,and the model of the response used in practical application was simulated according to the material and structure parameters.The influences of the detector material properties and structural parameters on the detector response characteristics were also analyzed through simulation,in which the influences of electricity time-constant and the hot time-constant were studied mostly.Signal extraction circuits for high-repetition-frequence pulse were designed.Finally,a number of repetition frequency laser radiation experiments on the pyroelectric detector and signal extraction circuits designed were carried out.The comparative experiments on frequency response and pulse width of the detector were completed,and the feasibility of applying the pyroelectric detector to energy measurement of high-repetition-frequency and narrow pulse laser was verified.The measuring range and other index marks of the detecting unit were given.