相关实验视频

Updated: May 21, 2025

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

Published on: July 26, 2024

基于石英增强光声谱学的ppb级甲快速检测

Yanjun Chen¹, Hanxu Ma¹, Shunda Qiao¹

¹National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150000, China.

Analytical chemistry

|March 20, 2025

概括

这项研究引入了一种新的石英增强光声谱学 (QEPAS) 系统,用于ppb级甲 (CH4) 检测. 增强的传感器设计实现了高灵敏度和快速测量,适合实时监控应用.

科学领域:

分析化学分析化学
频谱学是一种光谱学.
环境科学环境科学

背景情况:

甲 (CH4) 检测对于环境监测和工业安全至关重要.
传统的QEPAS系统在灵敏度和检测速度方面存在局限性.
开发先进的传感器以进行准确和快速的CH4分析至关重要.

研究的目的:

报告首次实施石英增强的光声谱学 (QEPAS) 和异构质QEPAS (H-QEPAS) 用于ppb级甲检测.
使用一种新型的低频圆头石英调音叉 (QTF) 和功率放大二极管激光来提高性能.
展示开发的用于持续CH4监测的传感器的实际应用.

主要方法:

采用自行设计的9.7 kHz圆头QTF作为声波传感器.
使用拉曼光纤放大器 (RFA) 来提高二极管激光功率到300mW.
集成的声学微振荡器 (AmRs) 可放大声波,实现107倍的信号增强.

主要成果:

对CH4实现了ppb级检测极限:1.321ppb (QEPAS) 和2.126ppb (H-QEPAS),整合时间为1000秒.
在两种传感器配置中都显示出出色的线性 (R平方>0.99).
通过实时QTF共振频率校准,H-QEPAS在3秒内实现了快速测量.

结论:

新的QTF和AMR集成显著提高了用于CH4检测的QEPAS性能.
开发的CH4-QEPAS和CH4-H-QEPAS传感器提供高灵敏度,线性和快速测量能力.
该系统适用于环境空气和生物样本中CH4的持续监测.

更多相关视频

Fast and Accurate Exhaled Breath Ammonia Measurement

Fast and Accurate Exhaled Breath Ammonia Measurement

Published on: June 11, 2014

Three-dimensional Optical-resolution Photoacoustic Microscopy

Three-dimensional Optical-resolution Photoacoustic Microscopy

Published on: May 3, 2011

相关概念视频

Gas Chromatography: Types of Detectors-II

Gas Chromatography: Types of Detectors-II

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...

Flame Photometry: Overview

Flame Photometry: Overview

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...

Atomic Emission Spectroscopy: Lab

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...