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http://dx.doi.org/10.3807/KJOP.2004.15.1.001

Measurement of oxygen isotope ratio using tunable diode laser absorption spectroscopy  

Park, Sang-Eon (Time and Frequency Lab., Korea Research Institute of Standards and Science)
Jung, Do-Young (Lab. of Quantum Optics, Korea Atomic Energy Research Institute)
Kim, Jae-Woo (Lab. of Quantum Optics, Korea Atomic Energy Research Institute)
Ko, Kwang-Hoon (Lab. of Quantum Optics, Korea Atomic Energy Research Institute)
Im, Kwon (Lab. of Quantum Optics, Korea Atomic Energy Research Institute)
Jung, Eui-Chang (Lab. of Quantum Optics, Korea Atomic Energy Research Institute)
Kim, Chul-Joong (Lab. of Quantum Optics, Korea Atomic Energy Research Institute)
Publication Information
Korean Journal of Optics and Photonics / v.15, no.1, 2004 , pp. 1-5 More about this Journal
Abstract
Tunable diode laser absorption spectroscopy was performed for analysis of the H$_2$$^{18}$ O/H$_2$$^{16}$ O isotope ratio of a water sample which was enriched by the membrane distillation method. In order to improve the signal-to-noise ratio, the wavelength modulation spectroscopic method was used with a lock-in amplifier. The fringe noise could be suppressed by using the FFT (Fast Fourier Transform) lowpass filter and the optimization of the modulation depth of the laser frequency. The maximum deviation of $\delta$-value was measured to be$\pm$4$\textperthousand$.
Keywords
diode laser; wavelength modulation spectroscopy; water vapor; oxygen; isotope ratio.;
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