为定量测量中红外高能激光的总能量和功率密度时空分布, 采用热吸收和光电量热复合相结合的测量方法, 通过热吸收体温度场分布数值计算和探测器结构设计, 研制了可用于长脉冲中红外高能激光测量的光斑探测器。探测器由量热堆、光电量热复合探测阵列、测温单元、数据采集单元和信号处理单元等几部分组成。有效测量面积为12 cm×12 cm, 光斑测量空间分辨率为2.4 cm, 时间分辨率为25 Hz, 总能量测量不确定度小于10%, 功率密度测量不确定度小于7%。实验表明, 该探测器可测量最大能量超过50 kJ的数秒级脉冲中红外激光, 采用该方法, 可实现大面积、高能量和高空间分辨的高能激光光斑测量。

A high energy laser beam sensor is developed using photoelectric and calorimetric compound method by temperature field calculation and structure design in order to measure long pulse mid-infrared laser. The sensor can measure the total energy and power density distribution. It is consisted of calorimetric pile, photoelectric and calorimetric compound detector array, temperature field sensors, analog to digital converter and signal processor. The sensor has the effective sensitive area of 12 cm×12 cm, the spatial resolution of 2.4 cm, and the temporal resolution of 25 Hz, with the total energy measurement uncertainty of less than 10% and the power density distribution measurement uncertainty of less than 7%. The experimental datas prove that the method can be used in high energy, large area and high spatial resolution laser beam measurement.