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Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

1.6K
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,...
1.6K
Gas Chromatography: Overview of Detectors01:13

Gas Chromatography: Overview of Detectors

2.0K
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...
2.0K
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

1.2K
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...
1.2K
High-Performance Liquid Chromatography: Types of Detectors01:15

High-Performance Liquid Chromatography: Types of Detectors

1.7K
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...
1.7K
Chromatographic Resolution01:15

Chromatographic Resolution

2.1K
In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
In chromatography,...
2.1K
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

14.5K
Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
14.5K

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Related Experiment Video

Updated: Feb 2, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution
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Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

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Subpixel resolution in CdTe Timepix3 pixel detectors.

Mohamad Khalil1, Erik Schou Dreier2, Jan Kehres1

  • 1Department of Physics, NEXMAP Section, Technical University of Denmark, Fysikvej, Lyngby, Copenhagen 2800, Denmark.

Journal of Synchrotron Radiation
|November 9, 2018
PubMed
Summary

Timepix3 detectors achieve subpixel X-ray resolution by analyzing photon interactions. This method precisely measures beam positions, improving accuracy in X-ray detection experiments.

Keywords:
CdTe X-ray detectorscharge sharinghybrid pixel spectral detectorssubpixel spatial resolution

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Area of Science:

  • Photon detection and imaging
  • Particle detector technology
  • Synchrotron radiation applications

Background:

  • Timepix3 is a hybrid-pixel detector chip enabling simultaneous time-of-arrival and energy measurements.
  • Time-of-arrival data allows for individual photon detection and cluster identification.
  • Subpixel positioning of X-ray interactions can be achieved using weighted means of pixel clusters.

Purpose of the Study:

  • To evaluate the subpixel positioning capabilities of the Timepix3 detector.
  • To determine optimal conditions for subpixel measurements using Timepix3.
  • To compare this novel subpixel resolution technique with existing methods.

Main Methods:

  • A Timepix3 pixel was scanned with a 5µm x 5µm pencil beam at the European Synchrotron Radiation Facility.
  • Scans were performed at 8x8 matrix positions with 5µm steps across four monochromatic energies (24, 35, 70, 120 keV).
  • Subpixel photon positions were reconstructed using weighted averages of charge spread, and beam positions were determined by averaging photon positions.

Main Results:

  • The study identified optimal conditions for subpixel measurements based on cluster size and beam position.
  • A novel technique utilizing charge sharing of individual photons achieved subpixel resolution.
  • The best performance was observed at 120 keV, measuring a beam step of 4.4µm ± 0.86µm.

Conclusions:

  • Timepix3 detectors can achieve precise subpixel resolution for X-ray interactions.
  • The charge-sharing method offers improved accuracy over intensity ratio techniques.
  • This advancement enhances the capability for detailed X-ray imaging and analysis.