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Volume 109
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In-situ measurement of size distribution and concentration in dilute particle flow with digital holographic probe
Xuecheng Wu, Dian Zhu, Zhiliang Xue, Zhiming Lin, Qiwen Jin *
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, 310027, China
10.1016/j.partic.2025.12.018
Volume 109, February 2026, Pages 127-140
Received 6 September 2025, Revised 13 November 2025, Accepted 19 December 2025, Available online 3 January 2026, Version of Record 8 January 2026.
E-mail: qwjin@zju.edu.cn
Highlights

• A new holographic probe developed for in-situ particle measurement.

• Simultaneous measurement of particle size distribution and concentration.

• Particle shape visualization in three-dimensional probe volume.


Abstract

Gas-solid two-phase flows are common in both industrial processes and natural phenomena, and accurately detecting particle properties within these flows is crucial for process optimization and control. However, existing particle detection techniques often struggle to provide in-situ, real-time, and multi-parameter measurements in complex flow environments. To address this challenge, a new digital holographic probe, designed for compactness and 3D measurement capability, is developed in this work. The delicate structure of the probe head makes it suitable for use in pneumatically conveyed particle flows within pipes, with a measurement volume of 435.6 mm3. The measurement performance of the holographic probe has been verified on a pipeline pneumatic transport test platform under various particle size and concentration conditions. Using 3D holographic imaging, the spatial distribution of particles within the measurement volume was analyzed. Experimental results show that the relative deviation of the mass median diameter is less than 3 %, while the relative deviation of the average mass concentration is below 12 %, compared to reference results.

Graphical abstract
Keywords
Digital inline holography; In-situ measurement; Particle size distribution; Concentration; Gas-solid flow
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