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12 December 2018 Detection of ammonia using logarithmic-transformed wavelength modulation spectrum
Menglong Cong Sr., Dandan Sun, Yiding Wang
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Proceedings Volume 10844, Advanced Laser Technology and Applications; 1084403 (2018) https://doi.org/10.1117/12.2503346
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
Abstract
Conventional wavelength modulation spectroscopy is improved by logarithmic-transformed data processing and differential detection for trace gas sensing. The optic intensity modulation is isolated from the gas absorption induced laser power attenuation via the logarithmic-transformation, and then it is balanced out by differential detection. The theory is validated by the detection of P(6) ammonia absorption line belonging to the v3 + v4 combination band in a stainless tube with effective path length of 24.5 cm, under room temperature (296 K) and atmospheric pressure (1.01e5 Pa). The second harmonic is recovered while the residual amplitude modulation and distortion of harmonic are eliminated. A 0.7 ppm (part per million) detection limit is estimated on the assumption that the signal is equal with the noise. Excellent repeatability is observed from continuous measurements of 20 times during 240 hours. Standard deviation of the measured ammonia mole fraction and the simulation data is 1.1%. All of these inspire results indicate that our strategy is an ideal option for trace gas detection.
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Menglong Cong Sr., Dandan Sun, and Yiding Wang "Detection of ammonia using logarithmic-transformed wavelength modulation spectrum", Proc. SPIE 10844, Advanced Laser Technology and Applications, 1084403 (12 December 2018); https://doi.org/10.1117/12.2503346
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KEYWORDS
Modulation
Absorption
Calibration
Sensors
Semiconductor lasers
Distortion
Spectroscopy
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