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Related Concept Videos

Gas Chromatography: Types of Detectors-I01:21

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,...
Vapor Pressure Lowering03:28

Vapor Pressure Lowering

The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates: Dissolving a nonvolatile substance in volatile liquid results in a lowering of the liquid’s vapor pressure. This phenomenon can be explained by considering the effect of added solute molecules on the liquid's vaporization and condensation processes. To vaporize, solvent molecules must be present at the surface of the solution. The presence of...
Vapor Pressure of Fluid01:28

Vapor Pressure of Fluid

The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
Vapor Pressure02:34

Vapor Pressure

When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
Gas Chromatography: Types of Detectors-II01:19

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...
Diffusion on Chromatography Columns01:07

Diffusion on Chromatography Columns

In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...

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Related Experiment Video

Updated: Jun 10, 2026

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector
07:57

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector

Published on: July 25, 2014

Group-delay diagnostic for measuring vapor column density.

J K Crane, R W Presta, J J Christensen

    Applied Optics
    |August 19, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We developed a simple laser diagnostic to measure vapor density and flow. This technique uses group-velocity delay to monitor vapor rate and other properties with high bandwidth and wide dynamic range.

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    Published on: May 22, 2020

    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Laser Spectroscopy
    • Fluid Dynamics

    Background:

    • Accurate measurement of vapor properties is crucial for various scientific and industrial applications.
    • Existing methods for vapor density and flow monitoring can be complex or lack sufficient bandwidth.
    • A need exists for a simple, high-bandwidth diagnostic tool for real-time vapor analysis.

    Purpose of the Study:

    • To introduce a novel technique for determining Nfl (likely referring to a vapor property like density-length product) using laser-based measurements.
    • To demonstrate the utility of this technique as a high-bandwidth vapor rate monitor.
    • To explore its capability in measuring various other vapor characteristics.

    Main Methods:

    • Utilizing the group-velocity delay of a probe laser beam.
    • Propagating the laser beam through a vapor medium.
    • Measuring the time delay experienced by the laser pulse.

    Main Results:

    • The technique allows for the determination of Nfl with high precision.
    • Demonstrated wide dynamic range and simplicity of implementation.
    • Successfully employed as a high-bandwidth vapor rate monitor.

    Conclusions:

    • The described laser diagnostic provides a simple, effective method for measuring vapor properties.
    • It offers a high-bandwidth solution for real-time vapor rate monitoring.
    • The technique is versatile and can be extended to measure column density, number density, oscillator strengths, absorption cross sections, and collisional line broadening.