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An optical gas sensor based on an erbium-doped fiber laser (EDFL) for measuring acetylene (C2H2) is presented. Here, by taking advantage of the thermooptic properties of a silicon (Si) wafer, the fiber laser emission line is set at 1532.81 nm, where a strong ro-vibrational absorption of the acetylene molecule occurs. Moreover, in our setup, the gas concentration induces cavity losses that affect laser transient characteristics. Here, by measuring the time delay (τd) from the laser transient, it was possible to measure the C2H2 concentration within the range from 0 to 22% with a sensitivity of 1.17 × 10–2 ms/% and a minimum detectable concentration of 942 ppm. Finally, it is shown that the sensor requires only 18.5 ms to complete a measurement.

Optical Gas Sensor Based on the Fiber Laser Transient Regime for Measuring Acetylene