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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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Flame Imaging Technology Based on 64-Pixel Area Array Sensor.

Xiaodong Huang1, Xiaojian Hao1, Baowu Pan2

  • 1Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Taiyuan 030051, China.

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|January 23, 2024
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Summary
This summary is machine-generated.

This study introduces a new tunable diode laser absorption spectroscopy (TDLAS) imaging method using a 64-pixel sensor to create detailed 2D flame temperature maps. This advanced technique overcomes line-of-sight limitations for improved combustion analysis.

Keywords:
ARTTDLAScombustion flametwo-dimensional imaging

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Area of Science:

  • Combustion diagnostics
  • Optical spectroscopy
  • Thermodynamics

Background:

  • High-resolution flame temperature imaging is crucial for understanding combustion.
  • Tunable diode laser absorption spectroscopy (TDLAS) is a key diagnostic tool.
  • Line-of-sight (LOS) limitations in TDLAS restrict data dimensionality and volume in combustion field measurements.

Purpose of the Study:

  • To develop and demonstrate a TDLAS imaging method for reconstructing 2D flame temperature fields.
  • To address the limitations of traditional TDLAS in combustion diagnostics.
  • To enhance the capability of TDLAS for high-precision, complex flame temperature measurements.

Main Methods:

  • Utilized a 64-pixel area array sensor for TDLAS imaging.
  • Employed the Algebraic Reconstruction Technique (ART) algorithm for temperature field reconstruction.
  • Validated the ART algorithm's robustness via numerical simulation.
  • Investigated the influence of temperature, concentration, and pressure on second harmonic intensity using the HITRAN database.

Main Results:

  • Successfully reconstructed the two-dimensional temperature field of a flame.
  • Verified reconstruction accuracy against thermocouple measurements, achieving a maximum relative error of 3.71%.
  • Demonstrated the effectiveness of the ART algorithm in TDLAS-based flame imaging.

Conclusions:

  • The developed TDLAS imaging system with a 64-pixel sensor enables high-precision, 2D flame temperature measurements.
  • This method overcomes previous data limitations associated with LOS TDLAS.
  • The findings pave the way for advanced combustion diagnostic technologies.