Fig 8 - uploaded by Yohsuke Tanaka
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Particle size distribution by image measurement: (a) observation of particles with telecentric lens; (b) histogram of particle size distribution (number of particles N p = 1147).
Source publication
We have developed a phase retrieval holography system using a single-board computer (SBC) with a graphics processing unit (GPU) for particle size measurement. The system comprises two cameras connected to the SBC with a GPU (Jetson NanoTM, NVIDIA®), a diode-pumped solid-state green laser, and a beam splitter. The GPU enables us to reconstruct holog...
Contexts in source publication
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... comparison with holographic measurement, we used image measurement to determine the sizes of particles stuck to a glass plate, as shown in Fig. 8(a). We used image analysis software (Fiji 2.3.0: Schindelin et al., 2012) to apply dynamic thresholding ( Prewitt et al., 1966) to the recorded image to obtain a binarized image, and we measured the particle size as the Feret diameter, as shown in Fig. ...
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... image measurement to determine the sizes of particles stuck to a glass plate, as shown in Fig. 8(a). We used image analysis software (Fiji 2.3.0: Schindelin et al., 2012) to apply dynamic thresholding ( Prewitt et al., 1966) to the recorded image to obtain a binarized image, and we measured the particle size as the Feret diameter, as shown in Fig. ...
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... Feret diameter is measured from the binarized images as in the image measurement of Fig. 8(b), and the particle size distributions of Gabor and phase retrieval holography are shown in Figs. 11(a) and 11(b), respectively. Gabor and phase retrieval holography have peaks of similar size. However, as mentioned above, Gabor holography has more particles below 40 μm than does phase retrieval holography because of the smaller size due ...
Context 4
... comparison with holographic measurement, we used image measurement to determine the sizes of particles stuck to a glass plate, as shown in Fig. 8(a). We used image analysis software (Fiji 2.3.0: Schindelin et al., 2012) to apply dynamic thresholding ( Prewitt et al., 1966) to the recorded image to obtain a binarized image, and we measured the particle size as the Feret diameter, as shown in Fig. ...
Context 5
... image measurement to determine the sizes of particles stuck to a glass plate, as shown in Fig. 8(a). We used image analysis software (Fiji 2.3.0: Schindelin et al., 2012) to apply dynamic thresholding ( Prewitt et al., 1966) to the recorded image to obtain a binarized image, and we measured the particle size as the Feret diameter, as shown in Fig. ...
Context 6
... Feret diameter is measured from the binarized images as in the image measurement of Fig. 8(b), and the particle size distributions of Gabor and phase retrieval holography are shown in Figs. 11(a) and 11(b), respectively. Gabor and phase retrieval holography have peaks of similar size. However, as mentioned above, Gabor holography has more particles below 40 μm than does phase retrieval holography because of the smaller size due ...
Citations
We have developed a phase retrieval holography module for microparticle measurement. The system that this module has comprises two cameras connected to a single-board computer (SBC) with a graphics processing unit (GPU), a diode-pumped solid-state green laser, and a beam splitter. Furthermore, the GPU provides real-time reconstruction. The system can record the shapes and positions of particles falling in a static flow in a three-dimensional volume as two holograms generating an interference pattern. Phase retrieval holography with two holograms solves the twin image problem that arises due to the lack of phase information. We also present the requirement of this module for experimentally recording and numerically reconstructing holograms of particles. Finally, we conclude that holographic measurement, limited to use in a laboratory, can be used for in-line/ on-line measurement of powder production processes.
Graphical Abstract Fullsize Image
Optical setup for particle size measurement using phase retrieval holography system with a GPUequipped SBC: (a) laser; (b) objective lens; (c) collimator lens; (d) ND filter; (e) observation box; (f) beam splitter; (e) telecentric lens; (h1) CMOS camera 1; (h2) CMOS camera 2; (i) NVIDIA Jetson Nano as GPU-equipped SBC.
