概括
一个新的功率调节的集成路径差分吸收 (PM-IPDA) 激光雷达系统有效地检测大气中的. 这种先进的激光雷达提供实时,区域开放路径监控,低检测极限.
科学领域:
- 大气遥感是指大气中的遥感.
- 激光光谱学 激光光谱学
- 环境监测 环境监测
背景情况:
- 准确的区域大气检测对于环境和健康评估至关重要.
- 传统方法在实时,开放路径监控能力方面面临局限性.
- 不同吸收激光雷达 (DIAL) 技术为选择性气体检测提供了潜力.
研究的目的:
- 引入和演示一种新的功率调制集成路径差分吸收 (PM-IPDA) 激光雷达系统,用于区域探测.
- 评估系统的性能,包括其检测极限和实时监控功能.
- 评估系统对干扰气体和噪声源的强度.
主要方法:
- 使用两个可调节的跨带级联激光器 (ICL),运行在约3.2μm (3236.6nm和3187.1nm) 的PM-IPDA激光器.
- 采用快速的富里埃转换算法来检索数据,时间分辨率为0.1秒.
- 优化调制频率到10kHz,并通过系统设计解决波长波动.
主要成果:
- 在PM-IPDA激光雷达显示有效的缓解干扰从H2O,CH4和HCl.
- 实验室实验证实了该系统能够减少1 / f噪声的误差.
- 开放式实验实现了大约0.60 mg·m−3.3 的二检测极限.
结论:
- 开发的PM-IPDA激光雷达系统适用于区域性,开放式,实时的探测.
- 该系统的设计尽量减少波长波动和干扰大气气体的影响.
- 这项技术为的持续环境监测提供了一个有前途的解决方案.
相关概念视频
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The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
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Structure of Benzene: Molecular Orbital Model
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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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