Trajectory and velocity measurement of a particle in spray by digital holography

Lü, Qieni; Chen, Yiliang; Yuan, Rui; Ge, Baozhen; Gao, Yan; Zhang, Yimo

doi:10.1364/ao.48.007000

Cited by 30 publications

(8 citation statements)

References 17 publications

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“…Digital in-line holography (DIH) has been extensively applied to the detection and characterization of particle fields, where the particles can be tracer particles in flow measurements [1][2][3][4], droplets in spray diagnostics [5][6][7][8], micro-organisms in biological mobility studies [9,10], bubbles in multiphase flows [11,12] and other particles of interest [13][14][15]. Besides the simplicity of the in-line setup, the accessibility to three-dimensional (3D) information has promoted the application of DIH, in which the particle size, shape and 3D location can be measured.…”

Section: Introductionmentioning

confidence: 99%

Uncertainty characterization of particle depth measurement using digital in-line holography and the hybrid method

Gao¹,

Guildenbecher²,

Reu³

et al. 2013

Opt. Express

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In the detection of particles using digital in-line holography, measurement accuracy is substantially influenced by the hologram processing method. In particular, a number of methods have been proposed to determine the out-of-plane particle depth (z location). However, due to the lack of consistent uncertainty characterization, it has been unclear which method is best suited to a given measurement problem. In this work, depth determination accuracies of seven particle detection methods, including a recently proposed hybrid method, are systematically investigated in terms of relative depth measurement errors and uncertainties. Both synthetic and experimental holograms of particle fields are considered at conditions relevant to particle sizing and tracking. While all methods display a range of particle conditions where they are most accurate, in general the hybrid method is shown to be the most robust with depth uncertainty less than twice the particle diameter over a wide range of particle field conditions.

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Section: Introductionmentioning

confidence: 99%

Uncertainty characterization of particle depth measurement using digital in-line holography and the hybrid method

Gao¹,

Guildenbecher²,

Reu³

et al. 2013

Opt. Express

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show abstract

“…The use of a CCD camera to digitally record holographic interference patterns has made digital holography (DH) an emerging technology with a variety of imaging applications, such as particle imaging, tracking in biomedical microscopy [8][9][10][11][12] and physical process profiling and measuring [13][14][15][16][17]. Digital Gabor/in-line holography (DIH) is a simple, lensless, yet effective setup for capturing holograms.…”

Section: Introductionmentioning

confidence: 99%

Compressive holographic video

Wang

Spinoulas

et al. 2017

Opt. Express

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Compressed sensing has been discussed separately in spatial and temporal domains. Compressive holography has been introduced as a method that allows 3D tomographic reconstruction at different depths from a single 2D image. Coded exposure is a temporal compressed sensing method for high speed video acquisition. In this work, we combine compressive holography and coded exposure techniques and extend the discussion to 4D reconstruction in space and time from one coded captured image. In our prototype, digital in-line holography was used for imaging macroscopic, fast moving objects. The pixel-wise temporal modulation was implemented by a digital micromirror device. In this paper we demonstrate 10× temporal super resolution with multiple depths recovery from a single image. Two examples are presented for the purpose of recording subtle vibrations and tracking small particles within 5 ms.

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“…Gabor's invention of holography in 1948 7 has provided an effective method for recording and reconstructing a 3D light field from a captured 2D hologram. The use of a CCD camera to digitally record holographic interference patterns has made digital holography (DH) an emerging technology with a variety of imaging applications, such as particle imaging, tracking in biomedical microscopy [8][9][10][11][12] and physical process profiling and measuring. [13][14][15][16][17] Digital Gabor/in-line holography (DIH) is a simple, lensless, yet effective setup for capturing holograms.…”

Section: Introductionmentioning

confidence: 99%

High-speed holographic imaging using compressed sensing and phase retrieval

Wang¹,

Ryu

He³

et al. 2017

SPIE Proceedings

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Digital in-line holography serves as a useful encoder for spatial information. This allows three-dimensional reconstruction from a two-dimensional image. This is applicable to the tasks of fast motion capture, particle tracking etc. Sampling high resolution holograms yields a spatiotemporal tradeoff. We spatially subsample holograms to increase temporal resolution. We demonstrate this idea with two subsampling techniques, periodic and uniformly random sampling. The implementation includes an on-chip setup for periodic subsampling and a DMD (Digital Micromirror Device)-based setup for pixel-wise random subsampling. The on-chip setup enables direct increase of up to 20 in camera frame rate. Alternatively, the DMD-based setup encodes temporal information as high-speed mask patterns, and projects these masks within a single exposure (coded exposure). This way, the frame rate is improved to the level of the DMD with a temporal gain of 10. The reconstruction of subsampled data using the aforementioned setups is achieved in two ways. We examine and compare two iterative reconstruction methods. One is an error reduction phase retrieval and the other is sparsity-based compressed sensing algorithm. Both methods show strong capability of reconstructing complex object fields. We present both simulations and real experiments. In the lab, we image and reconstruct structure and movement of static polystyrene microspheres, microscopic moving peranema, macroscopic fast moving fur and glitters.

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Trajectory and velocity measurement of a particle in spray by digital holography

Cited by 30 publications

References 17 publications

Uncertainty characterization of particle depth measurement using digital in-line holography and the hybrid method

Uncertainty characterization of particle depth measurement using digital in-line holography and the hybrid method

Compressive holographic video

High-speed holographic imaging using compressed sensing and phase retrieval

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