基于自适应导数-高斯寻峰算法的自动稳谱研究  

An automatic spectral stabilization based on adaptive derivative Gaussian peaking algorithm

作　　者：武雷超 李江坤[1,2,3] 张光雅 吴雪 李艺舟 WU Leichao;LI Jiangkun;ZHANG Guangya;WU Xue;LI Yizhou(Nuclear Industry Aerial Survey and Remote Sensing Center,Shijiazhuang 050002,China;Hebei Provincial Key Laboratory of Aerial Exploration and Remote Sensing Technology,Shijiazhuang 050002,China;Hebei Hangyao Technology Co.,Ltd.,Shijiazhuang 050002,China)

机构地区：[1]核工业航测遥感中心,石家庄050002 [2]河北省航空探测与遥感技术重点实验室,石家庄050002 [3]河北航遥科技有限公司,石家庄050002

出　　处：《核技术》2024年第8期51-58,共8页Nuclear Techniques

基　　金：核工业航测遥感中心项目(No.202308)资助~~。

摘　　要：航空γ能谱仪在高空测量过程中由于本底计数率较低,容易产生稳谱周期长、受温度影响较大等因素造成的谱线漂移问题,严重影响了测量结果的准确性。因此,本文提出了一种自适应导数-高斯联合寻峰算法,以达到航空γ能谱仪在低本底环境下快速寻峰、稳峰的目的。首先对导数寻峰算法的过程进行了优化,算法根据限定条件自动确定峰位道址及其左右边界,实现高斯寻峰算法的自适应变换本底窗宽扣除,然后使用高斯寻峰结果与导数寻峰结果进行对比验证,确保寻峰结果的准确性。实际测量结果表明:自适应导数-高斯联合寻峰算法计算速度快,准确率高,1024道航空γ能谱仪在-20~50℃范围内40K峰实测最大谱漂不超过±3道,为低本底环境下的航空γ能谱准确测量提供了新的稳谱方法。[Background]Aviationγspectrometer,measuring at high-altitude with low background counting rate,is prone to spectral line drift caused by factors such as long stable spectral periods and significant temperature effects due to its low background counting rate,hence seriously affects the accuracy of measurement results.[Purpose]This study aims to propose an adaptive derivative-Gaussian joint peak search algorithm so as to quickly find and stabilize the peak value of airborneγ-ray spectrometer in low background environment.[Methods]Firstly,the process of derivative peak finding algorithm was optimized so that it automatically determined the peak position,channel address,and left and right boundaries based on limited conditions,achieving adaptive transformation background window width deduction of Gaussian peak finding algorithm.Then,a self-developed miniaturized aviationγspectrometer was used for flight measurement experiments by mounting it on unmanned aerial vehicle,and temperature changing measurement experiments by placing it in a variable temperature oven.Finally,the adaptive derivative gaussian peak finding results were compared and verified with that of traditional derivative peak-seeking algorithm and traditional gaussian peak-seeking algorithm,to ensure the accuracy of the proposed peak finding results and the efficiency ofγspectral stabilization.[Results]The actual measurement results show that the adaptive derivative Gaussian joint peak finding algorithm has fast calculation speed and high accuracy.With 1024 aviation tracksγ,the maximum spectral drift of the 40K peak measured by the energy spectrometer within the range of−20℃to 50℃,does not exceed±3 channels.[Conclusions]This study provides a new spectral stabilization method for the accurate measurement of airborneγ-ray spectrum in low background environment.

关 键 词：航空γ能谱仪 自适应 寻峰算法 低本底 

分 类 号：TL822[核科学技术—核技术及应用]