Wide-range directional LDV employing modulated semiconductor laser source

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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.

Inspec keywords: laser velocimeters

Other keywords: single-sideband technique; laser Doppler velocimeter; wide range directional laser velocimeter; direction of flow; measuring range; direct modulation; equalisation; nonideal FM properties; modulated semiconductor laser source

Subjects: Measurement instrumentation and techniques for fluid dynamics; Velocity, acceleration and rotation measurement; Velocity, acceleration and rotation measurement; Level, flow and volume measurement; Laser applications

References

    1. 1)
      • S. Kobayashi . Direct frequency modulation in AlGaAs semiconductor lasers. IEEE Trans. , 428 - 441
    2. 2)
      • 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.
    3. 3)
      • H. Olsen , G. Jacobsen . A theoretical and experimental analysis of modulated laser fields and power spectra. IEEE J. Quantum Electron. , 2069 - 2080
    4. 4)
      • J.D.C. Jones , M. Corke , A.D. Kersey , D.A. Jackson . Miniature solid-state directional laser Doppler velocimeter. Electron. Lett. , 967 - 969
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Erratum: Wide-range directional LDV employing modulated semiconductor laser source