title: Oxygen measurement by multimode diode lasers employing gas correlation spectroscopy.
abstract: Multimode diode laser (MDL)-based correlation spectroscopy (COSPEC) was used to measure oxygen in ambient air, thereby employing a diode laser (DL) having an emission spectrum that overlaps the oxygen absorption lines of the A band. A sensitivity of 700 ppm m was achieved with good accuracy (2%) and linearity (R(2)=0.999). For comparison, measurements of ambient oxygen were also performed by tunable DL absorption spectroscopy (TDLAS) technique employing a vertical cavity surface emitting laser. We demonstrate that, despite slightly degraded sensitivity, the MDL-based COSPEC-based oxygen sensor has the advantages of high stability, low cost, ease-of-use, and relaxed requirements in component selection and instrument buildup compared with the TDLAS-based instrument.
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
authors.forename: Xiutao
authors.initials: X
authors.lastname: Lou
authors.forename: Gabriel
authors.initials: G
authors.lastname: Somesfalean
authors.forename: Bin
authors.initials: B
authors.lastname: Chen
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000032:analysis*; D054023:Lasers, Semiconductor; D010092:Oximetry / Q000295:instrumentation* / Q000379:methods; D010100:Oxygen / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods
chemical_list: D005740:Gases; D010100:Oxygen