研究目的
To investigate the application of a dual-beam interferometric particle imaging (DIPI) technique to the characterization of irregular coal particles, validating its accuracy with digital inline holography (DIH).
研究成果
The DIPI technique demonstrates good agreement with DIH in shape and size measurement of irregular coal particles, with a maximum difference as low as 9%. The backward arrangement of DIPI facilitates its further instrumental development and application to real industrial scenarios.
研究不足
The study focuses on micron-sized opaque coal particles, and the accuracy of the DIPI technique is evaluated to be around 9%, which may not be sufficient for all practical applications. The exact positions of the farthest points cannot be directly determined, and only a part of the morphology information can be retrieved.
1：Experimental Design and Method Selection:
The study employs a dual-beam interferometric particle imaging (DIPI) technique adapted from a dual-beam backward illumination configuration to access the size and 2D shape of an irregular particle from its interferogram. Digital inline holography (DIH) is used for validation.
2：Sample Selection and Data Sources:
Coal particles with equivalent diameters varying from 100μm to 200μm are dispersed into single ones with a home-designed powder feeder.
3：List of Experimental Equipment and Materials:
A 500mW diode laser (532nm), a color camera (Basler acA1920-40gc), a continuous He-Ne laser (623.8nm), and a home-designed powder feeder.
4：8nm), and a home-designed powder feeder.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser beam is split into two beams with equal intensity, which intersect to form a probe volume. Coal particles are delivered into and flow through the probe volume. The light scattered by the coal particle is collected by a camera lens and recorded by a color camera. DIH signals are recorded in the red channel, and DIPI signals are recorded in the green channel.
5：Data Analysis Methods:
The 2D-Fourier transform of DIPI interferograms and the 2D-autocorrelation of DIH reconstructed in-focus images are compared to evaluate the accuracy of DIPI.
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