到靶能量和光斑分布参数是评价高能激光系统性能指标的重要参数，为准确测量中红外高能激光系统远场能量和功率密度的时空分布，采用热吸收和光电探测相结合的测量方法，研制了可用于大面积、长脉冲中红外高能激光测量的复合式光斑探测阵列。探测阵列由石墨热吸收单元和PbSe光电探测器阵列、信号调理放大电路、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22 cm×22 cm，光斑测量空间分辨率为2.2 cm，时间分辨率为20 ms，能量测量不确定度小于10%，功率密度测量不确定度小于15%。采用该系统，可实现高能量、大面积中红外高能激光光斑参数的综合测量。

The energy and power density distributions at target are important parameters for high energy system performance evaluation. A high energy laser beam detector array is developed using photoelectric and calorimetric compound method to accurately measure large area and long pulse mid-infrared laser. The detector array consists of graphite calorimeter and PbSe photoelectric detector array, temperature and voltage amplifier, analog to digital converter and signal processor. The effective sensitive area of the system is 22 cm×22 cm, the spatial resolution is 2.2 cm, and the temporal resolution is 20 ms, with the total energy measurement uncertainty of less than 10% and the power density distribution measurement uncertainty of less than 15%. The system is very suitable for high energy and large area mid-infrared laser beam measurement.