面向微型光谱仪在线检测的光学系统误差校正方法  

Optical System Error Correction Method for Online Detection of Miniature Spectrometer

作　　者：周风波 朱红求[2] 李长庚[3] Zhou Fengbo;Zhu Hongqiu;Li Changgeng(School of Information Engineering,Shaoyang University,Shaoyang,Hunan 422000,China;School of Automation,Central South University,Changsha,Hunan 410083,China;School of Physics and Electronics,Central South University,Changsha,Hunan 410083,China)

机构地区：[1]邵阳学院信息工程学院,湖南邵阳422000 [2]中南大学自动化学院,湖南长沙410083 [3]中南大学物理与电子学院,湖南长沙410083

出　　处：《激光与光电子学进展》2022年第3期115-123,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金项目(61533021);湖南省教育厅优秀青年项目(19B518)。

摘　　要：微型光纤光谱仪由于具有小型化、集成化、检测速度快等特点,适合用于工业现场多组分物质的在线检测。针对微型光谱仪由于受到仪器杂散光、光度噪声和光源波动等因素的影响,导致测量光谱信号精度差的问题,提出了一种面向微型光谱仪在线检测的光学系统误差校正方法。该方法首先使用光谱仪在线测量光谱强度,并通过参考溶液和待测溶液获取光谱信号;其次,通过提出的自适应小波阈值去噪法,消除光谱信号的光度噪声,提升光谱信号的灵敏度;然后,提出了一种基于双波长光强比值不变性的光源稳定方法,动态消除光源误差;最后,对铜钴离子的光谱信号进行动态校正,并对校正曲线进行性能分析。结果表明,所提出的方法简单快速,适用于光谱信号的动态校正,以满足多金属杂质离子在线检测的需求。Due to its miniaturization,integration,and fast detection speed,the miniature optical fiber spectrometer was suitable for on-line detection of multi-component substances in industrial sites.In view of the problem that the micro spectrometer was affected by the stray light,photometric noise and light source fluctuation,the measurement accuracy of the spectral signal was poor,and an optical system error correction method was proposed for on-line detection of micro spectrometer.Firstly,a micro spectrometer was used to measure the spectral intensity online,and the spectral signal was obtained from the reference solution and the solution to be measured.Secondly,the adaptive wavelet threshold denoising method was used to eliminate the photometric noise of the spectral signal and improve the sensitivity of the spectral signal.Then,a light source stabilization method based on the invariance of the dual wavelength light intensity ratio was proposed to dynamically eliminate the light source error.Finally,the spectral signals of the copper and cobalt were dynamically corrected,and the performance analysis of the correction curve was performed.The results show that the method proposed in this paper is simple and fast,and it was suitable for dynamic correction of spectral signal to meet the needs of online detection of multi metal impurity ions.

关 键 词：微型光纤光谱仪 多金属离子检测 光学系统误差校正 自适应小波阈值法 

分 类 号：O433.4[机械工程—光学工程]