High resolution laser induced fluorescence Doppler velocimetry utilizing saturated absorption spectroscopy

Mitsutoshi Aramaki, Kohei Ogiwara, Shuzo Etoh, Shinji Yoshimura, Masayoshi Y. Tanaka

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    16 Citations (Scopus)

    Abstract

    A high resolution laser induced fluorescence (LIF) system has been developed to measure the flow velocity field of neutral particles in an electron-cyclotron-resonance argon plasma. The flow velocity has been determined by the Doppler shift of the LIF spectrum, which is proportional to the velocity distribution function. Very high accuracy in velocity determination has been achieved by installing a saturated absorption spectroscopy unit into the LIF system, where the absolute value and scale of laser wavelength are determined by using the Lamb dip and the fringes of a Fabry-Ṕrot interferometer. The minimum detectable flow velocity of a newly developed LIF system is ±2 m/s, and this performance remains unchanged in a long-time experiment. From the radial measurements of LIF spectra of argon metastable atoms, it is found that there exists an inward flow of neutral particles associated with neutral depletion.

    Original languageEnglish
    Article number053505
    JournalReview of Scientific Instruments
    Volume80
    Issue number5
    DOIs
    Publication statusPublished - 2009

    All Science Journal Classification (ASJC) codes

    • Instrumentation

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