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Related Concept Videos

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...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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,...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in the...

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A Rapid Laser Probing Method Facilitates the Non-invasive and Contact-free Determination of Leaf Thermal Properties
08:41

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[Tunable diode laser absorption spectroscopy system for trace ethylene detection].

Wei-Dong Pan1, Jia-Wei Zhang, Jing-Min Dai

  • 1School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China. whispe@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|January 5, 2013
PubMed
Summary
This summary is machine-generated.

Tunable diode laser absorption spectroscopy (TDLAS) offers high sensitivity for trace gas analysis. This study developed a TDLAS system to detect ethylene concentrations as low as 10 ppmv.

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Area of Science:

  • Spectroscopy
  • Laser Technology
  • Analytical Chemistry

Context:

  • Trace gas analysis requires high sensitivity and resolution.
  • Tunable diode laser absorption spectroscopy (TDLAS) provides these capabilities.
  • Ethylene detection is crucial in various industrial and environmental applications.

Purpose:

  • To develop and characterize a TDLAS system for sensitive ethylene detection.
  • To utilize the 1626.8 nm absorption line of ethylene.
  • To implement a white type multi-pass cell with wavelength modulation and harmonic detection.

Summary:

  • A TDLAS system was designed and tested for ethylene detection.
  • The system uses a 1626.8 nm absorption line and a multi-pass cell.
  • It achieved a detection limit of 10 ppmv for ethylene concentrations ranging from 20 to 1200 ppmv.

Impact:

  • Provides a highly sensitive method for ethylene monitoring.
  • Demonstrates the effectiveness of TDLAS in trace gas analysis.
  • Offers potential for real-time ethylene measurement in diverse settings.