Design and Experiments with a Robot-Driven Underwater Holographic Microscope for Low-Cost In Situ Particle Measurements

Mallery, Kevin; Canelon, Dario; Hong, Jiarong; Papanikolopoulos, Nikolaos

doi:10.1007/s10846-021-01404-3

Cited by 12 publications

(1 citation statement)

References 34 publications

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“…Holographic microscopes can be realized as field portable devices for high-throughput screening of natural waters − , in the form of standalone sensors and, in the future, as sensor networks that exchange relevant local information about the microparticles fluxes. Submersible holographic cameras are currently embedded onboard autonomous systems and underwater vehicles and are adopted to image the microparticle content of water columns at various depths. ,− Our work could add in the near future an intelligent subsystem to the existing sensors, able to equip them with better capabilities in interpreting holographic images. In order to move to field sampling, other abundantly occurring plankton species, for example, dinoflagellates or microzooplankton should be accurately characterized, though, by measuring their fractal holographic fingerprint in order to train classifiers to recognize them.…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Identification of Microplastics Based on the Fractal Properties of Their Holographic Fingerprint

et al. 2021

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Water plastic pollution is a serious problem affecting sealife, marine habitats, and the food chain. Artificial intelligence-enabled coherent imaging has recently shown exciting advances in the field of environmental monitoring, and portable holographic microscopes are good candidates to map the microparticles content of marine waters. The “holographic fingerprint” due to coherent light diffraction is rich in information, fully encoded into the complex wavefront scattered by the sample. Hence, proper analysis of the wavefronts reconstructed from digital holograms can unlock new possibilities in the fields of diagnostics and environmental monitoring. Fractal geometry well describes natural objects and allows inferring added-value information on the way these fill 2D spaces and 3D volumes. The most abundant micron-scale class of objects that populate marine waters consists of microalgae named diatoms, which are of interest as bioindicators of water quality. Here we investigate the fractal properties of holographic patterns of diatoms and microplastics, considering a heterogeneous mixture of five types of plastic materials and 55 different species of microalgae. We show that, different from the case of weak scattering objects, a small set of fractal parameters is able to characterize these two large ensembles. As an applicative example, we carry out classification tests to show the possibility to identify the two classes with high accuracy. This new holographic fractal description of scattering micro-objects could be used in the near future for in situ automatic mapping of microplastic pollutants and for taxonomy of diatoms as water quality bioindicators, screened onboard holographic systems.

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Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Identification of Microplastics Based on the Fractal Properties of Their Holographic Fingerprint

et al. 2021

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Advanced Optical Imaging Technologies for Microplastics Identification: Progress and Challenges

Zhu,

Li,

Huang

et al. 2024

Advanced Photonics Research

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Global concern about microplastic (MP) and nanoplastic (NP) particles is continuously rising with their proliferation worldwide. Effective identification methods for MP and NP pollution monitoring are highly needed, but due to different requirements and technical challenges, much of the work is still in progress. Herein, the advanced optical imaging systems that are successfully applied or have the potential for MP identification are focused on. Compared with chemical and thermal analyses, optical methods have the unique advantages of being nondestructive and noncontact and allow fast detection without complex sample preprocessing. Furthermore, they are capable of revealing the morphology, anisotropy, and material characteristics of MP for their quick and robust detection. This review aims to present a comprehensive discussion of the relevant optical imaging systems, emphasizing their operating principles, strengths, and drawbacks. Multiple comparisons and analyses among these technologies are conducted in order to provide practical guidelines for researchers. In addition, the combination of optical and other alternative technologies is described and the representative portable MP detection devices are highlighted. Together, they shed light on the prospects for long‐term MP pollution monitoring and environmental protection.

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Neglected infrastructures for 6G—Underwater communications: How mature are they?

Dao

Thanh

et al. 2023

Journal of Network and Computer Applications

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Design and Experiments with a Robot-Driven Underwater Holographic Microscope for Low-Cost In Situ Particle Measurements

Cited by 12 publications

References 34 publications

Identification of Microplastics Based on the Fractal Properties of Their Holographic Fingerprint

Identification of Microplastics Based on the Fractal Properties of Their Holographic Fingerprint

Advanced Optical Imaging Technologies for Microplastics Identification: Progress and Challenges

Neglected infrastructures for 6G—Underwater communications: How mature are they?

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