Title :
Measurement of oxygen isotope ratios using tunable diode laser absorption spectroscopy
Author :
Park, Sang Eon ; Jeong, Do-Young ; Kim, Jaewoo ; KO, Kwang-Hoon ; Jung, E.C. ; Kim, Cheol-Jug
Author_Institution :
Lab. for Quantum Opt., Korea Atomic Energy Res. Inst., Daejeon, South Korea
Abstract :
Tunable diode laser absorption spectroscopy was performed for analysis of oxygen isotope ratio in water sample enriched by the membrane distillation method. To enhance the signal-to-noise ratio, the wavelength modulation spectroscopic method was employed with a lock-in amplifier. Fringe noises were suppressed by a FFT (Fast Fourier Transform) low-pass filter and the optimized modulation depth of the laser frequency. The maximum deviation of measured δ-value was ±40/00.
Keywords :
distillation; fast Fourier transforms; interference suppression; isotope detection; low-pass filters; membranes; modulation spectroscopy; moire fringes; optical modulation; optical noise; optical tuning; oxygen; semiconductor lasers; FFT; O2; fringe noise supression; laser frequency; lock-in amplifier; low-pass filter; membrane distillation method; optimized modulation depth; oxygen isotope ratios measurement; signal-to-noise ratio; tunable diode laser absorption spectroscopy; water sample; wavelength modulation spectroscopic method; Absorption; Amplifiers; Biomembranes; Diode lasers; Isotopes; Performance analysis; Signal to noise ratio; Spectroscopy; Tunable circuits and devices; Wavelength measurement;
Conference_Titel :
Lasers and Electro-Optics, 2003. CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on
Print_ISBN :
0-7803-7766-4
DOI :
10.1109/CLEOPR.2003.1274698
