相关实验视频
Updated: Jul 23, 2025
08:31
Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
18.2K
基于光声谱的ppb级多气体传感器,使用对称的多共振腔光声细胞
Tailin Li1, Chaotan Sima1, Yan Ai1
1Next Generation Internet Access National Engineering Research Center, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
Photoacoustics
|July 17, 2023
概括
我们开发了一种紧的多共振光声细胞 (MR-PAC),用于同时传感多气体. 该系统实现了对乙,氧化和四甲的低检测极限,显示了便携式应用的前景.
科学领域:
- 分析化学 分析化学
- 频谱学是一种光谱学.
- 光学工程是指光学工程.
背景情况:
- 光声谱学 (PAS) 是一种敏感的气体检测技术.
- 传统的PAS系统可能很庞大,限制了便携性.
- 多气体传感需要复杂的系统,能够处理多个波长和检测通道.
研究的目的:
- 设计和演示一个紧的,对称的多共振光声细胞 (MR-PAC).
- 通过多共振器光声谱学 (MR-PAS) 实现同时多气体传感.
- 为了在单一系统中实现多种气体的低最低检测极限 (MDL).
主要方法:
- 制造一个对称的MR-PAC与三个相互连接的声学共振器 (50毫米长,~3000赫兹共振频率).
- 集成双麦克风,用于两点检测.
- 使用一个近红外二极管激光器和两个中红外量子级联激光器同时检测C2H2,NO和CF4.
主要成果:
- 证明了C2H2,NO和CF4的同时检测.
- 达到C2H2的MDL为480ppb,NO为260ppb,CF4为0.57ppb,整合时间为1s.
- 该系统在正常大气压下运行.
结论:
- 开发的MR-PAC是一个最小化的多气体传感系统.
- 采用双麦克风的MR-PAS方法提供高灵敏度和同时检测能力.
- 这项技术对便携式多气体传感器件的开发具有前景.
相关概念视频
01:19Gas Chromatography: Types of Detectors-II
424
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...
424
01:26Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
258
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
258