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Related Concept Videos

Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

1.0K
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...
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Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

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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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Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

1.7K
Detectors in gas chromatography (GC) help identify and quantify the components of a mixture by translating chemical properties into measurable signals, which are displayed on a chromatogram. Detectors can be categorized into two main types: destructive and non-destructive.
A non-destructive detector allows a sample to be analyzed without altering or consuming it, meaning the sample can be collected after detection for further analysis. Examples include thermal conductivity detectors and...
1.7K
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

1.4K
The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Gas Chromatography–Mass Spectrometry (GC–MS)01:14

Gas Chromatography–Mass Spectrometry (GC–MS)

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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
A gas chromatograph consists of a long, narrow capillary column with a polysiloxane coating on the inner wall....
6.3K
Gas Chromatography: Sample Injection Systems01:08

Gas Chromatography: Sample Injection Systems

1.2K
In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...
1.2K

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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Mixed-gas CH4/CO2/CO detection based on linear variable optical filter and thermopile detector array.

Shaoda Zhang1,2, Wu Bin3, Binbin Xu1

  • 1Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China.

Nanoscale Research Letters
|November 27, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel middle-infrared linear variable optical filter and thermopile detectors for a compact mixed gas detector. These components enable accurate measurement of methane, carbon dioxide, and carbon monoxide.

Keywords:
Linear variable optical filterMixed gas detectorsMulti-layer dielectricsTapered cavityThermopile detector

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Area of Science:

  • Optoelectronics
  • Infrared Spectroscopy
  • Gas Sensing Technology

Background:

  • Miniaturized gas detectors are crucial for environmental monitoring and industrial safety.
  • Accurate detection of methane (CH4), carbon dioxide (CO2), and carbon monoxide (CO) in mixed gas environments presents significant challenges.

Purpose of the Study:

  • To design, fabricate, and characterize a middle-infrared (MIR) linear variable optical filter (LVOF) and uncooled thermopile detectors.
  • To develop a miniaturized mixed gas detector system for simultaneous CH4/CO2/CO measurement.

Main Methods:

  • The LVOF was engineered as a tapered-cavity Fabry-Pérot optical filter utilizing multi-layer dielectric structures for Bragg reflectors and antireflective films.
  • Uncooled thermopile detectors were fabricated using micro-electro-mechanical system (MEMS) technology, featuring a multiple-thermocouple suspension structure.
  • Characterization involved evaluating the optical performance of the LVOF and the responsivity of the thermopile detectors.

Main Results:

  • The LVOF demonstrated a mean full-width-at-half-maximum (FWHM) of 400 nm and a peak transmittance of 70% across the 2.3–5 μm wavelength range.
  • The thermopile detectors achieved a responsivity of 146 μV/°C at room temperature.
  • Successful quantification and identification of CH4/CO2/CO mixed gas were demonstrated using the developed system.

Conclusions:

  • The fabricated MIR LVOF and thermopile detectors are suitable for a miniaturized mixed gas detector.
  • The integrated system shows promise for effective CH4/CO2/CO gas sensing applications.
  • This technology advancement contributes to the development of more portable and efficient gas analysis tools.