Orthographic imaging of free-flowing aerosol particles

Laning, Jesse C.; Berg, Matthew J.

doi:10.1364/osac.2.003514

Cited by 9 publications

(6 citation statements)

References 17 publications

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“…In order to improve the accuracy of particle localization along the depth direction, DIH has been integrated with tomographic methods to perform particle field measurements [8,[22][23][24][25][26][27][28][29][30][31]. Generally, in tomographic holography, several illumination beams (usually originating from a single laser source) pass through the object of interest along different directions to generate different projections for tomography.…”

Section: Hybrid Dh Systemsmentioning

confidence: 99%

“…Considering the reflection of the mirrors, the deconvoluted light path is shown in the bottom of figure 3(a). On the other hand, if more sensors are used, each projection can be recorded by a single sensor [8,[23][24][25][26][27][28][29][30][31], as shown in figure 3(b), where three sensors are utilized to capture three holograms, respectively. Due to its flexibility, the latter strategy is frequently adopted to perform tomographic holography.…”

Section: Hybrid Dh Systemsmentioning

confidence: 99%

“…Firstly, besides in-line or off-axis optical configurations of DH, some other novel configurations have been reported. These configurations are designed by combining DH with other optical diagnostic techniques, such as tomography [8,[22][23][24][25][26][27][28][29][30][31][32], Raman/Mie scattering [33][34][35][36][37][38][39][40][41], and imaging pyrometry [42][43][44][45][46][47], aiming to improve the measurement accuracy of DH or obtain more information about the target flows simultaneously. Secondly, since holographic image processing algorithms play a critical role in DH, the latest developments are introduced, including numerical reconstruction methods, auto-focusing methods, and the methods for separating overlapping particles [48][49][50][51][52][53] and tracking moving particles [54][55][56][57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

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Recent advances and applications of digital holography in multiphase reactive/nonreactive flows: a review

Huang

Cai

et al. 2021

Meas. Sci. Technol.

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In various multiphase flows, the characterization of particle dynamics is of great significance to understand the interaction between particles and the surrounding flows. Digital holography (DH) is a versatile 3D imaging technique, which has shown great advantages in quantitative analysis and non-intrusive diagnosis of various particle fields. This review focuses on the advances and applications of DH in multiphase reactive/non-reactive flows in the last two decades. The basic principles of DH are introduced firstly, including its mathematical background and representative experimental configurations. Then, the image processing algorithms for hologram reconstruction and automatic focusing are summarized, along with the methods for separating overlapping particles and tracking moving particles. As a prevailing and powerful tool, the recent applications of deep learning in processing holographic images is also included in this review. Furthermore, the applications of DH in the characterization of particle dynamics in multiphase reactive/non-reactive flows are surveyed in detail. Lastly, the review concludes with the discussion of the technical limits of DH and provides insights into its promising future research directions.

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Section: Hybrid Dh Systemsmentioning

confidence: 99%

Section: Hybrid Dh Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent advances and applications of digital holography in multiphase reactive/nonreactive flows: a review

Huang

Cai

et al. 2021

Meas. Sci. Technol.

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“…A critical advantage of Nano-DIHM is that, during reconstruction, a single 2D hologram can produce a 3D image of the objects without any loss of resolution 50 , 58 . The Octopus/Stingray software allows real-time or offline reconstruction with a temporal resolution on the order of milliseconds (62.5 ms) and it can be improved to microsecond-scale temporal resolution, depending on the frame rate of the camera 57 , 65 , 70 , 71 .…”

Section: Introductionmentioning

confidence: 99%

Advancing the science of dynamic airborne nanosized particles using Nano-DIHM

et al. 2021

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In situ and real-time characterization of aerosols is vital to several fundamental and applied research domains including atmospheric chemistry, air quality monitoring, or climate change studies. To date, digital holographic microscopy is commonly used to characterize dynamic nanosized particles, but optical traps are required. In this study, a novel integrated digital in-line holographic microscope coupled with a flow tube (Nano-DIHM) is demonstrated to characterize particle phase, shape, morphology, 4D dynamic trajectories, and 3D dimensions of airborne particles ranging from the nanoscale to the microscale. We demonstrate the application of Nano-DIHM for nanosized particles (≤200 nm) in dynamic systems without optical traps. The Nano-DIHM allows observation of moving particles in 3D space and simultaneous measurement of each particle’s three dimensions. As a proof of concept, we report the real-time observation of 100 nm and 200 nm particles, i.e. polystyrene latex spheres and the mixture of metal oxide nanoparticles, in air and aqueous/solid/heterogeneous phases in stationary and dynamic modes. Our observations are validated by high-resolution scanning/transmission electron microscopy and aerosol sizers. The complete automation of software (Octopus/Stingray) with Nano-DIHM permits the reconstruction of thousands of holograms within an hour with 62.5 millisecond time resolution for each hologram, allowing to explore the complex physical and chemical processes of aerosols.

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“…Using the IPI technique, we do not record the exact shape of the particles, but we obtain information about their dimensions, their orientations and morphology [22]. The characterization of irregular particles has become the object of intense efforts [23][24][25][26]. For an irregular rough particle such as an ice crystal, the interferometric out-of-focus image is a speckle-like pattern.…”

Section: Introductionmentioning

confidence: 99%

Interferometric Ice Particle Imaging in a Wind Tunnel

Talbi

Duperrier

Delestre

et al. 2021

Optics

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We report interferometric ice particle imaging and sizing in an icing wind tunnel with wind speeds of 70 m/s. Single particle interferograms are first analysed, size measurements are performed, and examples of possible reconstructed shapes are deduced from the interferometric images. Particle sizing is also performed in the case of ice particles whose out-of-focus images overlap, with or without Moiré phenomena. Results show that the IPI technique can be carried out for irregular rough particles in a critical environment such as in an icing wind tunnel with high wind speeds.

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Orthographic imaging of free-flowing aerosol particles

Cited by 9 publications

References 17 publications

Recent advances and applications of digital holography in multiphase reactive/nonreactive flows: a review

Recent advances and applications of digital holography in multiphase reactive/nonreactive flows: a review

Advancing the science of dynamic airborne nanosized particles using Nano-DIHM

Interferometric Ice Particle Imaging in a Wind Tunnel

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