一种靶材表面激光辐照功率的间接测量方法

现有的激光功率测量技术难以满足高能激光器到靶功率的测量需求。本文提出了一种基于埋入式FBG(光纤布拉格光栅)传感的靶材表面激光辐照功率间接测量方法。利用两个埋入式FBG传感器实现对靶材内不同深度处温度变化的精确测量，通过对两个FBG传感器测得的温度差进行函数拟合，即可求得靶材表面的激光辐照功率。仿真结果表明，本文所提方法能够有效、精确、不受波长和功率水平限制的间接测得靶材表面的辐照功率。

An indirect measuring method for laser power on target surface

The present measure technologies of laser power is is difficult to meet the measurement requirements of the superficial power of targets produced by high energy laser device.An indirect method embedded FBG (fiber Bragg grating) sensors for measuring the superficial power on targets produced by high energy laser is proposed in this paper.Two FBG sensors are embedded in different depths of the target,to realize accurate measurement of temperature changes at different depths within the target.By curve fitting the temperature difference of the two FBG sensors,the superficial power of targets produced by high energy laser can be measured indirectly.The result of simulations indicates that the proposed method in this paper is effective and accurate,and can indirectly measure the superficial power of targets produced by high energy laser,which is not limited by wavelength and power level.