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Gas Chromatography: Types of Detectors-II01:19

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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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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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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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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).
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Noise characterization and compensation for a charge-coupled-device-based pyrometer.

Yuzhong Zhang1, Fucheng Lu1, Wenjing Wang1

  • 1School of Instrument Science and Opto-Electronics Engineering, Hefei University of Technology, Hefei 230009, Anhui, China.

The Review of Scientific Instruments
|July 10, 2021
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Summary
This summary is machine-generated.

Charge-coupled device (CCD) pyrometers are improved for industrial temperature measurement. This study quantifies noise impacts and uses non-uniformity correction and Kalman filtering to enhance accuracy, reducing temperature fluctuations significantly.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Instrumentation

Background:

  • Charge-coupled device (CCD) pyrometers are cost-effective for industrial temperature measurement.
  • Inter-element sensitivity deviations and various noise sources (dark current, shot noise, readout-quantization noise) affect CCD sensor accuracy.
  • Existing methods may not fully address these deviations and noise impacts on temperature readings.

Purpose of the Study:

  • To characterize and quantify the influence of inter-element sensitivity deviations and noise on CCD-based pyrometer accuracy.
  • To develop and evaluate methods for reducing these errors and improving temperature measurement precision.
  • To assess the effectiveness of non-uniformity correction and Kalman filtering for enhancing pyrometer performance.

Main Methods:

  • Characterization of inter-element sensitivity deviations, dark current, shot noise, and readout-quantization noise.
  • Application of a simple segment correction method to obtain pixel-specific non-uniformity correction coefficients.
  • Implementation of a Kalman filter to mitigate temperature fluctuations caused by noise.
  • Quantitative evaluation of the impact of noise on temperature measurement accuracy.

Main Results:

  • Non-uniformity correction reduced the spatial standard deviation of temperature measurements to 2.2°C across the 800-1200°C range.
  • Kalman filtering decreased temperature fluctuations from 26.6°C to 1.98°C.
  • The combined methods significantly improved the accuracy and stability of CCD-based pyrometer temperature measurements.

Conclusions:

  • The developed non-uniformity correction and Kalman filtering techniques effectively address CCD sensor limitations.
  • These methods provide a significant improvement in temperature measurement accuracy and stability for CCD-based pyrometers.
  • The study demonstrates a practical approach to enhance the performance of widely used industrial temperature measurement systems.