光学学报, 2017, 37 (8): 0830002, 网络出版: 2018-09-07
基于波长调制的离轴积分腔输出光谱技术 
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Off-Axis Integrated Cavity Output Spectroscopy Technique Based on Wavelength Modulation
图 & 表
图 2. HITRAN 2012 数据库中7185.87 cm-1附近CH4和H2O吸收光谱的仿真结果
Fig. 2. Simulation of CH4 and H2O absorbance near 7185.87 cm-1 using HITRAN 2012 database
图 3. 不同压力下调制幅度与2f信号峰值高度的关系
Fig. 3. Relationship between modulation amplitude and 2f signal peak height at different pressures
图 4. 2f信号峰值高度随(a)调制相位和(b)调制频率的变化
Fig. 4. Variations of 2f signal peak height with (a) modulation phase and (b) modulation frequency
图 5. (a) 2f峰值信号高度与时间的关系;(b) Allan方差
Fig. 5. (a) Relationship between 2f signal peak height and time; (b) Allan variance
图 6. 不同CH4浓度下(a)2f信号和(b)1f信号波形
Fig. 6. Waveforms of (a) 2f signal and (b) 1f signal at different CH4 concentrations
图 7. 较长时间测量得到的10种浓度CH4的(a) 2f信号峰值高度和(b) 1f信号中间值
Fig. 7. Measured (a) 2f signal peak height and (b) 1f signal medium value over a long period of measurement for CH4 of ten different concentrations
图 8. 2f信号峰值高度、2f/1f与CH4浓度的关系
Fig. 8. Variations of 2f signal peak height and the ratio of 2f signal peak height to 1f signal medium value (2f/1f) with CH4 concentration
图 9. (a) 2f信号峰值高度、2f/1f值与时间的关系图;(b) 2f信号峰值高度和2f/1f值与CH4浓度的线性关系
Fig. 9. (a) Variations of 2f signal peak height and 2f/1f value with time; (b) linear relationship between 2f signal peak height or 2f/1f value and CH4 concentration
图 10. OA-ICOS技术得到的CH4气体的(a)吸收谱线及(b)拟合残差
Fig. 10. (a) Absorption line of CH4 and (b) fitting residual obtained by OA-ICOS technique
吴涛, 徐冬, 何兴道, 赖荣, 程涛. 基于波长调制的离轴积分腔输出光谱技术[J]. 光学学报, 2017, 37(8): 0830002. Tao Wu, Dong Xu, Xingdao He, Rong Lai, Tao Cheng. Off-Axis Integrated Cavity Output Spectroscopy Technique Based on Wavelength Modulation[J]. Acta Optica Sinica, 2017, 37(8): 0830002.
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