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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...
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,...
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

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 properties and...
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...
Flame Photometry: Overview01:02

Flame Photometry: Overview

Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...

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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers
10:21

Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

Published on: May 5, 2016

Light emitting diode based flow-through optical absorption detectors.

P K Dasgupta1, H S Bellamy, H Liu

  • 1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, U.S.A.

Talanta
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

Simple and inexpensive optical absorption detectors can be built using light emitting diodes (LEDs). These detectors range from basic transmittance models to high-performance, computer-interfaced systems achieving high measurement precision.

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Area of Science:

  • Optical physics and instrumentation
  • Spectroscopy and photochemistry

Background:

  • Optical absorption detectors are crucial for various scientific measurements.
  • Existing designs can be complex and costly, limiting accessibility.
  • Light emitting diodes (LEDs) offer potential as cost-effective light sources for detectors.

Purpose of the Study:

  • To review existing literature on LED-based optical absorption detectors.
  • To describe novel, inexpensive, high-performance detector designs utilizing LEDs.
  • To detail construction, electronics, performance, and cost of investigator-used designs.

Main Methods:

  • Literature review of LED-based optical absorption detector designs.
  • Detailed description and construction of novel detector prototypes.
  • Characterization of commercially available LEDs and performance evaluation of developed detectors.

Main Results:

  • Demonstration of simple, single-beam transmittance detectors built within an LED.
  • Development of high-performance, fully referenced, computer-interfaced detectors.
  • Achievement of measurement standard deviations as low as 2-3 x 10(-6) absorbance using pulsed, high-speed detection.

Conclusions:

  • Simple, inexpensive, high-performance optical absorption detectors are feasible using LEDs.
  • Novel designs offer a range of capabilities from basic to advanced applications.
  • LEDs provide a versatile and cost-effective solution for optical detection instrumentation.