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Deindee, Tabarek Falah
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Physics

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GAS CONCENTRATION MEASUREMENTS OF C2H2 USING A CALIBRATION RELATION OF TDLS SPECTROMETER Mahmood, Ruaa Kahtan; Sekeb, Amani Ali; Deindee, Tabarek Falah; Al Masoudi, Amal Abd Al-Amir
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 3 (2025): JOP (Journal Online of Physics) Vol 10 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i3.47025

Abstract

The work has been demonstrated by varying the wavelength of a tunable DFB laser diode, a Tunable Diode Laser Spectroscopy (TDLS) simulation method employing a sinusoidal signal to enhances the sensitivity of the spectrometer. Since the laser drive current is tuned, altering the current will cause the laser diode's wavelength to shift within the Near Infrared (NIR) tuning range of around 0.02 nm. A set focus value of 0.5 ppm and a fixed open path length (distance between laser source and back reflector) of 100 m were used to evaluate the TDLS's sensitivity. A MATLAB code was written to change the exact wavelength of the near infrared region, and the frequency domain evaluations were taken to extract the value of the second harmonic, which is an indication of the presence of the gas to be detected. The value of wavelength has been found in NIR region of the acetylene was about 1530. 47 nm. It should be noted the amount of gas concentrations were performed at a distance of 100 meters, with the gas concentration being N = 0.05 to 0.5 ppm in 0.2 increments.
Co-Authors Al Masoudi, Amal Abd Al-Amir Mahmood, Ruaa Kahtan Sekeb, Amani Ali