激光锁相放大技术在顶空分析中的应用  

Application of laser technology based on phase-locked amplifier in headspace analysis

作　　者：胡朋兵[1] 潘孙强[1] 崔晨晨 陈哲敏[1] 张建锋[1] 郭钢祥[1] 陈宁 HU Peng-bing;PAN Sun-qiang;CUI Chen-chen;CHEN Zhe-min;ZHANG Jian-feng;Guo Gang-xiang;Chen Ning(Zhejiang Institute of Metrology,Hangzhou 310018,China)

机构地区：[1]浙江省计量科学研究院

出　　处：《激光与红外》2019年第11期1317-1322,共6页Laser & Infrared

基　　金：国家自然科学基金项目(No.41805108;No.41605101);国家质量基础的共性技术研究与应用专项(No.2016YFF0200305);浙江省质量技术监督局科研项目(No.20170213);浙江省质监系统质量技术基础项目(No.20180104)资助

摘　　要：基于FPGA研究了激光数字锁相放大技术,利用Lorentz线型模拟CO2吸收曲线,研究了调制系数、调制相位对吸收曲线二次谐波信号的影响,实现了调制参数的最优化。在此基础上,搭建了激光检测系统并对培养瓶内CO2浓度进行了顶空测量。结果表明:研制的顶空分析系统检测性能良好,输出二次谐波信号与CO2浓度的线性拟合度达99.98%,测量范围为0~20%,1σ检测限达到0.05%。Laser technology based on FPGA digital phase-locked amplifier is investigated in this paper.Using the absorption curve of CO2 simulated with Lorentz line-shape,the influences of modulation coefficient and phase on the second harmonic signal is studied,and the modulation parameters are optimized.On this basis,a laser detection system is designed and the headspace CO2 concentration in the incubator is monitored by using the system.Experimental results indicate that the designed system is qualified with a high detection performance.The linear fitting degree of the output second harmonic signal and CO2 concentration is 99.98 %,the measurement range is 0 to 20 %,and the detection limit of 1σ is 0.05 %.

关 键 词：顶空分析 TDLAS 锁相放大 二次谐波 

分 类 号：TN21[电子电信—物理电子学]