Oxygen measurement by multimode diode lasers employing gas correlation spectroscopy.
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.
Lou
Xiutao
X
Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
Somesfalean
Gabriel
G
Chen
Bin
B
Zhang
Zhiguo
Z
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
D005740:Gases; D010100:Oxygen