Abstract
The unique advantages of high-frequency pulsed diode laser for fringe type laser Doppler anemometry is described. Unlike the known LDA-technique using cw-lasers, pulse repetition rates much higher than the Doppler frequencies and pulse durations in the nanosecond range will be applied. This technique offers a number of benefits: Firstly, in pulse mode the time-averaged number of photons may be considerably higher than in cw-mode and secondly, the output power of single pulses emitted from diodes offers very high output power and can be synchronized with the sampling process of the data acquisition system. Thirdly, multi-component velocity measurements can be made using only one receiver and one signal processing chain at identical wavelengths of all components without any crosstalk. The corresponding techniques of “pulse integration” and “coherent sampling” will be described in detail and the advantages and limitations in comparison to conventional cw-mode LDAs will be pointed out. The experimental verifications of the new techniques are described as far as they have been performed until now.
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Dopheide, D., Strunck, V. & Pfeifer, H.J. Miniaturized multicomponent laser Doppler anemometers using high-frequency pulsed diode lasers and new electronic signal acquisition systems. Experiments in Fluids 9, 309–316 (1990). https://doi.org/10.1007/BF00188758
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DOI: https://doi.org/10.1007/BF00188758