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Double Resonance Techniques: Overview

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Updated: Sep 17, 2025

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

基于双螺旋联合/分割点模式的高灵敏度TDLAS传感器

Haiyue Sun^1,2, Xiaorong Sun^1,2, Ying He¹

¹National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China.

Analytical chemistry

|July 3, 2025

概括

这项研究引入了一个新的可调节二极管激光吸收光谱 (TDLAS) 传感器,使用双螺旋点图案来增强气体检测. 它实现了对甲和双气体监测的高灵敏度,这对于环境应用至关重要.

科学领域:

频谱学是一种光谱学.
环境科学环境科学
激光技术激光技术激光技术

背景情况:

可调节二极管激光吸收光谱 (TDLAS) 对于气体传感至关重要.
对于现实应用,需要紧且高度灵敏的TDLAS传感器.
多通道细胞 (MPC) 提高了灵敏度,但可以增加大小.

研究的目的:

开发一种高灵敏度的TDLAS传感器,使用一种新的双螺旋点图案.
在一个紧的传感器结构中实现高检测灵敏度.
为了证明同时进行双气体检测的能力.

主要方法:

在三镜多通道电池 (MPC) 中设计了一种密集的双螺旋联合点图案.
实现了双螺旋分裂点模式,用于同时进行双组件传感.
使用TDLAS检测甲 (CH4) 和乙 (C2H2).

主要成果:

达到CH4的最低检测极限 (MDL) 122.9ppb,减少到15.4ppb,延长了整合时间.
证明同时监测CH4 / C2H2的MDL为354.7ppb和111.2ppb,改进到分别为35.7ppb和19.5ppb.
对两种气体来说,在信号和度之间建立了一个高度敏感的线性关系.

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

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ReAsH/FlAsH Labeling and Image Analysis of Tetracysteine Sensor Proteins in Cells

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Electronic Tongue Generating Continuous Recognition Patterns for Protein Analysis

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结论:

双螺旋点图案TDLAS传感器提供高灵敏度和紧性.
该传感器适用于环境监测,包括城市CH4测量.
开发的系统可以实时,同时检测多种气体.