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A natural gas leakage detector based on scanned-wavelength direct absorption spectroscopy is described. The sensor employs a multi-channel scanned-wavelength direct absorption strategy.It has the potential to simultaneously monitor methane and hydrogen sulfide in open path environment.Traditionally,scanned-wavelength direct absorption spectroscopy is the technique choice for natural gas leakage applications because of its simplicity,accuracy,and stability.We perform the gas sensor using direct-absorption wavelength scans with isolated features at 1-kHz repetition rate and the center wavelength is stabilized at the center of the 2v_3 band R(3) line of methane(1.65μm) and the(v_1+v_2+v_3) combination band of hydrogen sulfide(1.57μm),respectively.The influence of light intensity fluctuations can be eliminated by using scanned-wavelength direct absorption spectroscopy.Because of the fast wavelength scanning,the sensor has a response time of less than 0.1 s.The sensor can be configured to sense leakages in path-integrated concentrations of,for example,100-ppm·m hydrogen sulfide and 10-ppm·m methane.
A natural gas leakage detector based on scanned-wavelength direct absorption spectroscopy. The sensor employs a multi-channel scanned-wavelength direct absorption strategy. It has the potential to simultaneously monitor methane and hydrogen sulfide in open path environment. Traditionally, scanned- wavelength direct absorption spectroscopy is the technique choice for natural gas gas leakage applications because of its simplicity, accuracy, and stability. We perform the gas sensor using direct-absorbing wavelength scans with isolated features at 1-kHz repetition rate and the center wavelength is stabilized at the center of the 2v_3 band R (3) line of methane (1.65μm) and the (v_1 + v_2 + v_3) combination band of hydrogen sulfide (1.57μm), respectively. The influence of light intensity fluctuations can be eliminated by using scanned -wavelength direct absorption spectroscopy.Because of the fast wavelength scanning, the sensor has a response time of less than 0.1 s. The sensor can be configured to sense leakages in path-integrated concentrations of, for example, 100-ppm · m hydrogen sulfide and 10-ppm · m methane.