...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Optics and Lasers in Engineering >A portable sensor for in-situ measurement of ammonia based on near-infrared laser absorption spectroscopy
【24h】

A portable sensor for in-situ measurement of ammonia based on near-infrared laser absorption spectroscopy

机译：基于近红外激光吸收光谱的氨氮现场测量便携式传感器

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A portable laser sensor for trace ammonia (NH3) is developed based on near-infrared laser absorption spectroscopy. Tunable diode laser absorption spectroscopy in conjunction with wavelength modulation spectroscopy is implemented by a system-on-chip based on field-programmable gate array. A variable temperature multipass cell with a 15m optical path length is adopted to enhance the absorption path length and avoid the NH3 adsorption. The physical dimension of the sensor is minimized into 43 x 18 x 16 cm(3) on the benefit of home-made electronic system and compact optical design. A unique absorption line of NH3 around 1.51 sm covered by a distributed feedback diode laser is selected to reduce the influence from carbon dioxide, vapor and other trace gases. Calibration-free modulation spectroscopy is employed to avoid the random fluctuations due to laser noise and non-absorption transmission losses. The performance of sensor including adsorption of NH3, stability and flow of gas are examined and discussed in detail. For removing the adsorption of NH3, the temperature-dependent curve is obtained by the direct absorption spectroscopy, and it shows that the adsorption is significantly suppressed at (or higher than) 415 K. According to Allan deviation analysis, the minimum detection limit is 0.16 ppm at 184 s, and the rise time and the fall time of system are about 4.5 s and 3.7 s, respectively. The feasibility of the sensor is validated and deployed to monitor the NH3 slip in selective catalytic reduction (SCR) of coke oven flue gas. The work provides a potentially valuable control sensor for SCR.
机译：基于近红外激光吸收光谱技术开发了一种用于痕量氨（NH3）的便携式激光传感器。通过基于现场可编程门阵列的片上系统，可以实现可调谐二极管激光吸收光谱与波长调制光谱的结合。采用光学路径长度为15m的可变温度多通道电池，以增加吸收路径长度并避免NH3吸附。得益于自制电子系统和紧凑的光学设计，传感器的物理尺寸被最小化为43 x 18 x 16 cm（3）。选择一条由分布反馈二极管激光器覆盖的，约1.51 sm的NH3吸收线，以减少二氧化碳，蒸气和其他痕量气体的影响。采用无标定调制光谱，以避免由于激光噪声和非吸收传输损耗引起的随机波动。对传感器的性能，包括NH3的吸附，稳定性和气体流量进行了检查和详细讨论。为了消除NH3的吸附，通过直接吸收光谱法获得了随温度变化的曲线，表明在415 K（或高于415 K）时，吸附被显着抑制。根据Allan偏差分析，最小检出限为0.16 ppm在184 s处，系统的上升时间和下降时间分别约为4.5 s和3.7 s。该传感器的可行性已得到验证，并已用于监测焦炉烟气选择性催化还原（SCR）中的NH3泄漏。这项工作为SCR提供了潜在的有价值的控制传感器。

著录项

  • 来源
    《Optics and Lasers in Engineering》 |2019年第4期|243-248|共6页
  • 作者

    Guo Xinqian; Zheng Fei; Li Chuanliang; Yang Xiaofei; Li Ning; Liu Shuping; Wei Jilin; Qiu Xuanbing; He Qiusheng;

  • 作者单位

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China;

    Taiyuan Univ Sci & Technol, Sch Appl Sci, Taiyuan 030024, Shanxi, Peoples R China|Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Guangdong, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    TDLAS; Ammonia slip; WMS-2f/1f;

    机译：TDLAS;氨气泄漏;WMS-2f / 1f;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号