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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。
In order to quantitatively measure the temporal and spatial distribution of total energy and power density of mid-infrared high-energy laser, a combination of heat absorption and photothermal calorimetry was used to measure the temperature field distribution and detector structure. Mid-infrared high-energy laser spot light detector. Detector by the calorimeter, photothermal calorimetric composite detection array, temperature measurement unit, data acquisition unit and signal processing unit and other parts. The effective measurement area is 12 cm × 12 cm, the spatial resolution of spot measurement is 2.4 cm, the time resolution is 25 Hz, the total energy measurement uncertainty is less than 10%, and the power density measurement uncertainty is less than 7%. Experiments show that the detector can measure several seconds of pulsed mid-infrared laser with the maximum energy exceeding 50 kJ. This method can measure high-energy laser spot with large area, high energy and high spatial resolution.