具有相调节的近红外激光分散光谱仪用于开放路径的甲探测
Thomas E Wall1, Neil A Macleod1, Damien Weidmann1
1Space Science and Technology Department (RAL Space), STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom.
The Review of scientific instruments
|February 12, 2024
概括
一个新的激光光谱仪准确地测量大气中的甲. 这种具有成本效益的仪器使用相位调制进行可靠的测量,不受光功率变化的影响,并经过六天的测试.
科学领域:
- 大气科学和光谱学.
- 环境监测技术 环境监测技术
- 基于激光的分析仪器仪表.
背景情况:
- 准确测量大气中的甲 (CH4) 对气候变化研究至关重要.
- 现有的甲检测方法可能很复杂或对环境变化敏感.
- 开发强大且具有成本效益的甲传感器是一个持续的需求.
研究的目的:
- 开发一种简单,紧,经济高效的基于激光的分散光谱仪,用于大气中甲的测量.
- 为了实现对光功率变化无影响的甲度测量.
- 在实验室和现场条件下验证开发的仪器的性能.
主要方法:
- 使用成熟的近红外光子组件来实现紧的设计.
- 实现了用于光学测量的相调节,使功率变化免疫.
- 开发了一个支持物理模型来解释分散测量.
- 通过控制和持续的大气监测验证了仪器的精度和长期稳定性.
主要成果:
- 在实验室条件下,通过2秒的测量时间,在100米的路径长度上达到每亿分之2.6 (ppb) 的精度.
- 在六天的时间里,使用86米的开放路径,证明了连续的大气甲测量.
- 证实了仪器的强度和对光功率波动的免疫力.
结论:
- 开发的基于激光的开放路径分散光谱仪为大气甲监测提供了简单,经济高效和可靠的解决方案.
- 该仪器能够进行不受光功率变化影响的测量,这提高了它在各种环境中的实际适用性.
- 成功的验证证明了这项技术在连续,高精度的大气气体传感方面的潜力.
相关概念视频
01:19Gas Chromatography: Types of Detectors-II
371
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
371
01:26Raman Spectroscopy Instrumentation: Overview
375
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
375
01:25IR Spectrometers
1.2K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.2K
01:02Flame Photometry: Overview
592
Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
592