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

Volume

1

fYear

2003

fDate

15-19 Dec. 2003

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics, 2003. CLEO/Pacific Rim 2003. The 5th Pacific Rim Conference on

Print_ISBN

0-7803-7766-4

Type

conf

DOI

10.1109/CLEOPR.2003.1274698

Filename

1274698