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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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Related Experiment Video

Updated: Jul 9, 2026

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

3.3-microm microcavity light emitter for gas detection.

E Hadji, E Picard, C Roux

|December 8, 2007

Summary

A novel room-temperature resonant-cavity light source using CdHgTe demonstrates enhanced performance. This microcavity device significantly improves linewidth, intensity, and angular spread for gas detection applications.

Area of Science:

Optoelectronics
Semiconductor devices
Infrared technology

Background:

Developing efficient room-temperature light sources is crucial for various applications, including gas sensing.
Molecular beam epitaxy (MBE) allows for precise growth of semiconductor layers for optoelectronic devices.
Resonant cavities and Bragg mirrors can enhance light source performance by controlling optical feedback.

Purpose of the Study:

To present a room-temperature resonant-cavity light source emitting at 3.327 micrometers.
To investigate the performance enhancements offered by a microcavity structure compared to unprocessed samples.
To demonstrate the utility of this light source in a basic gas-detection setup.

Main Methods:

Fabrication of a light-emitting device combining a CdHgTe layer (grown by MBE) with YF(3)-ZnS Bragg mirrors.

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Last Updated: Jul 9, 2026

$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

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Optical pumping of the CdHgTe layer using a commercial low-power GaAs laser diode.

Characterization of the microcavity device's optical properties (linewidth, intensity, angular spread) and its application in gas detection.

Main Results:

Achieved a 10-fold reduction in linewidth and a 3.3-fold increase in intensity at 3.327 micrometers.
Demonstrated a 2.4-fold decrease in angular spread for the emitted light.
Successfully used the 15 microwatt optical power device for detecting a butane-propane mixture (1-5x10(-3) bar) in a gas cell.

Conclusions:

The developed resonant-cavity light source offers significantly improved performance at room temperature.
The microcavity design effectively enhances light emission properties for infrared applications.
This technology shows promise for practical gas-detection systems operating at room temperature.