1.531μm附近NH_3分子痕量探测
文献类型：期刊论文
| 作者 | 贾慧 ; 郭晓勇 ; 蔡廷栋 ; 赵卫雄 ; 汪磊 ; 谈图 ; 张为俊 ; 高晓明 |
| 刊名 | 光谱学与光谱分析
 |
| 出版日期 | 2009 |
| 卷号 | 29期号:12页码:3173-3176 |
| 关键词 | 离轴积分腔输出光谱技术 波长调制 二次谐波 NH3 探测极限 |
| ISSN号 | 1000-0593 |
| 其他题名 | Trace Detection of Ammonia at 1.531 μm |
| 通讯作者 | 北京8701信箱 |
| 中文摘要 | 基于离轴积分腔输出光谱技术(OA-ICOS)的小型集成系统以工作在近红外1.531μm附近的分布反馈式(DFB)二极管激光器为光源,测量了室温下各种低浓度NH3与空气的混合气。首先利用标准浓度的CO2气体校准得到腔镜的有效反射率R为0.9969,在此条件下,基长35.8cm的光学谐振腔作为吸收池可得到115.46m的吸收光程。NH3在6528.764cm-1位置的强吸收谱线被选择用于痕量探测,在100torr的总压力下,实验测得NH3的探测极限为2.66ppmv(S/N～3),之后结合波长调制技术,在信号检测通路中采用锁相放大技术来实现调制信号的二次谐波检测,这可以更好地抑制背景噪声而提高探测信号的信噪比,最终将NH3的探测极限进一步提高到0.274ppmv(S/N～3)。 |
| 英文摘要 | A compact instrument based on the off-axis integrated-cavity output spectroscopy(ICOS)technology was developed for sensitive measurements of gas mixing ratios(ammonia in air)at room temperature by using fiber-coupled distributed feedback(DFB)diode laser operating at 1.531 μm.The absorption line of ammonia at 6 528.764 cm-1 was chosen for trace detection.The mirrors effective reflectivity R2 of 0.996 9 was first calibrated by carbon dioxide under this condition,and the cavity 35.8 cm in length as an absorption cell could yield an optical path of presumably 115. 46 m. As a result.a minimum detectable concentration of approximately 2. 66 ppmv(S/ N-3) at the total pressure of 100 torr was obtained. Then the lock in amplifier was added in the system to acquire the second harmonic signal by combination of wavelength modulation technology.which could better suppress background noise and improve the signal-to-noise ratio .and a detection limit of 0. 293 ppmv (S/ N-3) was achieved eventually. This work demonstrated the potential of the system for a range of atmospheric species sensing in the future. |
| 学科主题 | 空间技术 |
| 资助信息 | 国家高技术研究发展计划项目 |
| 语种 | 中文 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/657]  |
| 专题 | 国家空间科学中心_空间技术部 |
| 推荐引用方式 GB/T 7714 | 贾慧,郭晓勇,蔡廷栋,等. 1.531μm附近NH_3分子痕量探测[J]. 光谱学与光谱分析,2009,29(12):3173-3176. |
| APA | 贾慧.,郭晓勇.,蔡廷栋.,赵卫雄.,汪磊.,...&高晓明.(2009).1.531μm附近NH_3分子痕量探测.光谱学与光谱分析,29(12),3173-3176. |
| MLA | 贾慧,et al."1.531μm附近NH_3分子痕量探测".光谱学与光谱分析 29.12(2009):3173-3176. |
入库方式： OAI收割
来源：国家空间科学中心
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