研究目的
To propose a differential laser Doppler velocimeter using 48-channel spatial encoded measurement points for dense cross-sectional velocity distribution measurements.
研究成果
The experimental results indicate that a cross-sectional velocity distribution is successfully measured with the proposed method, demonstrating its potential for dense 2D velocity distribution measurements in research and industrial applications.
研究不足
The spatial resolution is limited, especially along the axial direction, probably due to the broadening of the beams from aberration. The use of aspherical lenses could improve resolution. The wavelength of the tunable laser was not swept but set manually at intervals, which may not be suitable for unsteady flow measurements.
1：Experimental Design and Method Selection:
The study employs an asymmetrical push–pull configuration and multiple photodiodes to increase the number of measurement points. The functionality of the proposed structure is experimentally demonstrated.
2：Sample Selection and Data Sources:
The experiment uses a 48-channel sensor probe setup with three ports of an 8-channel commercial tunable laser as light sources.
3：List of Experimental Equipment and Materials:
Includes a tunable laser, LN phase-shifter array, PM fiber arrays, collimating lens, cylindrical lens, focusing lens, reflection-type ruled diffraction grating, InGaAs avalanche PDs, and a digital oscilloscope.
4：Experimental Procedures and Operational Workflow:
The setup involves generating beam arrays, frequency shifting, launching beams to the probe setup, and measuring beat signals with a digital oscilloscope.
5：Data Analysis Methods:
The beat frequencies are measured and analyzed to determine the velocity distribution.
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