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Temperature Measurements by Wavelength Modulation Diode Laser Absorption Spectroscopy with Logarithmic Conversion and

Vladimir Liger1, Vladimir Mironenko1, Yury Kuritsyn1

  • 1Institute of Spectroscopy, Russian Academy of Sciences, 5 Fizicheskaya Str., Moscow 108840, Russia.

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Summary
This summary is machine-generated.

A novel tunable diode laser absorption spectroscopy sensor accurately measures temperature despite laser fluctuations. This advanced sensor uses water molecule absorption lines for reliable gas temperature evaluation, even with significant noise.

Keywords:
TDLASfirst harmoniclogarithmic processingmultiplicative noisetemperature measurementstunable diode laser absorption spectroscopywavelength modulation

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Area of Science:

  • Optical Engineering
  • Spectroscopy
  • Laser Technology

Background:

  • Accurate temperature measurement is crucial in various industrial and research applications.
  • Strong laser intensity fluctuations pose a significant challenge for traditional temperature sensing methods.
  • Tunable diode laser absorption spectroscopy (TDLAS) offers a non-intrusive approach to gas property measurements.

Purpose of the Study:

  • To develop and validate a robust sensor for accurate temperature measurements under conditions of high laser intensity fluctuation.
  • To leverage TDLAS with specific signal processing techniques for enhanced performance.
  • To assess the efficacy of different data processing algorithms for temperature determination.

Main Methods:

  • Development of a TDLAS-based sensor incorporating wavelength modulation and logarithmic conversion.
  • Detection of the first harmonic of the modulation frequency to isolate the absorption signal.
  • Temperature evaluation based on the ratio of integrated absorbance of two distinct water molecule spectral lines.
  • Comparison of simultaneous and independent fitting algorithms for spectral data processing.
  • Validation of sensor accuracy against a commercial thermocouple.

Main Results:

  • The developed sensor demonstrated effective temperature measurement capabilities even with substantial multiplicative noise.
  • An error of less than 40 K at 1000 K was achieved, even when processing single diode laser scans.
  • Both tested data processing algorithms provided reliable temperature evaluations.
  • The sensor's performance was validated through comparison with a commercial thermocouple.

Conclusions:

  • The novel TDLAS sensor is highly effective for accurate gas temperature measurements in environments with significant laser intensity fluctuations.
  • The chosen spectroscopic approach and signal processing methods provide a robust solution for challenging measurement conditions.
  • The sensor offers a reliable and accurate alternative to conventional temperature measurement devices in specific applications.