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Wide-range directional LDV employing modulated semiconductor laser source

Wide-range directional LDV employing modulated semiconductor laser source

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A laser Doppler velocimeter (LDV) based on a semiconductor laser is described. Information on the direction of flow is obtained by applying a single-sideband technique using direct modulation of the laser diode. A measuring range of 8.4 MHz is reached with this technique, where the nonideal FM properties of the semiconductor laser are dealt with by an equalisation of the modulation current.

References

    1. 1)
      • Boiarski, A.A., Kingsley, S.A.: `Differential Doppler velocimeter using polarisation-preserving optical fibre', Proceedings of 1st conf. on optical fibre sensors, 1983, London, p. 214–216.
    2. 2)
      • J.D.C. Jones , M. Corke , A.D. Kersey , D.A. Jackson . Miniature solid-state directional laser Doppler velocimeter. Electron. Lett. , 967 - 969
    3. 3)
      • S. Kobayashi . Direct frequency modulation in AlGaAs semiconductor lasers. IEEE Trans. , 428 - 441
    4. 4)
      • H. Olsen , G. Jacobsen . A theoretical and experimental analysis of modulated laser fields and power spectra. IEEE J. Quantum Electron. , 2069 - 2080
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