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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...

Gas Chromatography: Types of Detectors-I

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...

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Updated: May 11, 2026

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

Detection of nitrogen dioxide using an external modulation diode laser.

Yong Yang¹, Zhihui Gao, Dehui Zhong

¹College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China.

|May 15, 2013

Summary

A new diode laser technique enables real-time nitrogen dioxide (NO2) monitoring. This method offers straightforward evaluation and noise reduction for accurate gas concentration measurements.

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Chemiluminescence-based Assays for Detection of Nitric Oxide and its Derivatives from Autoxidation and Nitrosated Compounds

Published on: February 16, 2022

Area of Science:

Analytical Chemistry
Spectroscopy
Environmental Science

Background:

Accurate monitoring of nitrogen dioxide (NO2) is crucial for environmental and industrial applications.
Existing detection methods may face challenges with real-time analysis, complexity, or noise interference.

Purpose of the Study:

To develop and demonstrate a novel technique for sensitive and real-time detection of nitrogen dioxide.
To assess the performance of the developed method in terms of detection limit and operational simplicity.

Main Methods:

Utilized a diode laser operating at 445 nm for nitrogen dioxide detection.
Employed external modulation and correlation detection techniques for signal processing.
Applied a least-squares method for evaluating absorption signals.

Main Results:

Achieved a detection limit of 5 parts per million (ppm) for nitrogen dioxide.
Demonstrated the technique's effectiveness at room temperature and atmospheric pressure.
The method showed straightforward data evaluation and noise reduction capabilities.

Conclusions:

The developed diode laser-based technique is suitable for real-time nitrogen dioxide monitoring.
The system's low complexity and high sensitivity make it a promising tool for environmental sensing.