Universiti Teknologi Malaysia Institutional Repository

Gas sensor design based on a line locked tunable fiber laser and the dual path correlation spectroscopy method

Vargas Rodriguez, E. and Guzman Chavez, A. D. and Raja Ibrahim, R. K. and Cardoso Lozano, L. E. (2017) Gas sensor design based on a line locked tunable fiber laser and the dual path correlation spectroscopy method. Applied Sciences (Switzerland), 7 (9). ISSN 2076-3417

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In this work a hybrid gas sensor based on a tunable fiber laser and a correlation spectroscopy technique is presented. The laser is tuned by varying the temperature of a bulk silicon wafer of 85 μm thickness and, once the desired wavelength is reached the line, is locked by keeping fixed its temperature. According to experimental results the wafer temperature variation was in the order of 0.02 K, which induced an estimated wavelength deviation of 0.12 pm, which satisfies the high wavelength position accuracy required for gas sensing applications. Additionally, it is shown that errors due to laser intensity fluctuations can be minimized by implementing a simple dual path correlation spectroscopy stage. As a proof of the suitability of our tunable fiber laser for gas sensing applications, a C2H2 sensor was implemented. By using a 10 cm gas cell at atmospheric pressure, it was possible to detect concentrations from 0 to 20% with a sensitivity of 521 ppm and sub-minute time response. Moreover, the experimental measurements and simulated results have a high level of agreement. Finally, it is important to point out that, by using doped fiber with different characteristics, other wavelength emissions can be generated.

Item Type:Article
Uncontrolled Keywords:Fiber lasers, Gas detectors, Optical sensors, Optoelectronic and photonic sensors
Subjects:Q Science > QC Physics
ID Code:75342
Deposited By: Widya Wahid
Deposited On:21 Mar 2018 00:39
Last Modified:21 Mar 2018 00:39

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