Researches on underwater transmission characteristics of blue-green laser

Chen, Yanglong; Hu, Xiaoyi; Wang, Deqing; Chen, Huabin; Zhan, Chaowu; Ren, Huaijin

doi:10.1109/oceans-taipei.2014.6964423

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…Optical systems equipped with their own light source adopt those wave lengths of the visible spectrum that are the least attenuated in water. For example, blue-green laser light is commonly used in Underwater lidar systems since, at this wavelength, both absorption and scattering are minimized [19,20].…”

Section: Why Is There Such a Difference Between Aerial And Underwater Mappingmentioning

confidence: 99%

Underwater Survey for Oil and Gas Industry: A Review of Close Range Optical Methods

et al. 2021

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In both the industrial and scientific fields, the need for very high-resolution cartographic data is constantly increasing. With the aging of offshore subsea assets, it is very important to plan and maintain the longevity of structures, equipment, and systems. Inspection, maintenance, and repair (IMR) of subsea structures are key components of an overall integrity management system that aims to reduce the risk of failure and extend the life of installations. The acquisition of very detailed data during the inspection phase is a technological challenge, especially since offshore installations are sometimes deployed in extreme conditions (e.g., depth, hydrodynamics, visibility). After a review of high resolution mapping techniques for underwater environment, this article will focus on optical sensors that can satisfy the requirements of the offshore industry by assessing their relevance and degree of maturity. These requirements concern the resolution and accuracy but also cost, ease of implementation, and qualification. With the evolution of embedded computing resources, in-vehicle optical survey solutions are becoming increasingly important in the landscape of large-scale mapping solutions and more and more off-the-shelf systems are now available. The issues raised in this review are mainly related to the qualification of the results produced by optical systems and their limitations to cover all the needs expressed by the oil and gas industry field. Interesting qualification works of these solutions are presented in this paper as well as the use of online processing tools such as visual odometry or VSLAM to guide the data acquisition and pre-qualified survey. Finally, it seems interesting to combine acoustic and optical technologies in order to extend the field of application of these methods to low visibility conditions, which remains one of the main limiting factors in the generalization of the use of optical sensors in high resolution underwater cartography applications.

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Section: Why Is There Such a Difference Between Aerial And Underwater Mappingmentioning

confidence: 99%

Underwater Survey for Oil and Gas Industry: A Review of Close Range Optical Methods

et al. 2021

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“…In this work, we aim to prove a connection between the underwater acoustic channel and the optical channel to predict the SNR of an optical communication system. While the literature includes optical communication systems with range of hundreds of meters [22], these works use a highly-directive laser source that requires perfect alignment between the transmitter and the receiver, and assume very clear water (c = 0.063 1/m). Instead, we consider a LED-based optical communication system whose semiaperture angle is three orders of magnitude larger than the lasers, and thus imposes fewer limitations on system alignment.…”

Section: B Basics Of Ocmentioning

confidence: 99%

On the Relationship Between the Underwater Acoustic and Optical Channels

Diamant

Campagnaro

Grazia

et al. 2017

IEEE Trans. Wireless Commun.

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Wireless transmissions in water are mostly carried out via long-range (but low-rate) underwater acoustic communications, or short-range (but high-rate) underwater optical communications. In this paper we are interested in finding whether a statistical relationship exists between underwater acoustics and optics. Besides the theoretical interest of such relationship, predicting the quality of the optical link through acoustics is also relevant in the context of a multimodal system with both acoustics and optics. Our study is based on a large dataset acquired during the NATO ALOMEX'2015 expedition. During this experiment, we simultaneously measured several characteristics of the acoustic and optical links at multiple locations, reflecting a diversity of sea environments. Our results, show a strong correlation between the properties of the acoustic link and the reliability of optical communications. This correlation makes it possible to predict the state of the underwater optical link at a certain depth and range. Due to the complexity of the acoustic and optical channels, we could not find the source of this correlation. This work is therefore aimed to stimulate a theoretical study of the mutual properties of underwater acoustic and optical communication links. For reproducibility, we share the processed data from the experiment.

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Fuzzy Rule-Based Signal Restoration for Wireless Optical Communication of Multi-autonomous Underwater Vehicles

Zhang

2020

Int. J. Fuzzy Syst.

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Researches on underwater transmission characteristics of blue-green laser

Cited by 6 publications

References 9 publications

Underwater Survey for Oil and Gas Industry: A Review of Close Range Optical Methods

Underwater Survey for Oil and Gas Industry: A Review of Close Range Optical Methods

On the Relationship Between the Underwater Acoustic and Optical Channels

Fuzzy Rule-Based Signal Restoration for Wireless Optical Communication of Multi-autonomous Underwater Vehicles

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