Latest Papers Related to OWPT 2024 on the Topics of Devices, Components and Systems

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "New Applications Enabled by Photonics Technologies and Systems".

Deadline for manuscript submissions: 31 January 2025 | Viewed by 1108

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Guest Editor
Photonics Research Laboratory, University of Electro-Communications, Tokyo 182-8585, Japan
Interests: power over fiber; optical communication
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Special Issue Information

Dear Colleagues,

Electrical power transmission is an essential function of equipment. Although wiring, batteries, and energy harvesting have been used, these methods have various problems. Society can advance with new equipment and services by addressing the power transmission issue. Power transmission methods using light beams are attracting attention as promising technologies. The first method involves power transmission in wireless, which, similar to wireless communication, has greatly progressed society. Optical wireless power transmission (OWPT) is extremely promising because of its potential for long-distance power transmission, lack of electromagnetic interference, small size, and lightweight. The second method involves power transmission using an optical fiber. Power over fiber (PoF) has the potential to provide new value to infrastructure by being lightweight and taking advantage of features not provided in existing wiring, such as surge resistance and integration with extremely high-capacity communications.

These optical power transmission technologies will be applied in the near future to a wide variety of applications, from minute IoT terminals to home appliances, industrial equipment, mobilities such as electric vehicles, robots, and drones, and power transmission infrastructure in various environments where conventional methods are difficult to apply. On the other hand, although the basic technical functions of these optical power transmission technologies already exist, practical and commercial systems are still very limited, and thus, the activation of related research strongly demands the development of many applications. By clarifying the superiority of this optical power transmission, identifying the problems to be solved, and collecting the state-of-the-art features of this field, such as materials, devices, subsystems, systems, and applications, as well as safety and standardization, we can anticipate the creation of numerous societal benefits in the foreseeable future.

For this reason, we have decided to publish a Special Issue that contains the latest results. Although this field is related to energy and photonics technologies, it is configured by a wide range of technologies, such as materials, devices, systems, and applications, as described above. This Special Issue will target papers related to individual devices such as light sources and light-receiving devices, functional integration, systems, and applications of optical power transmission.

Dr. Tomoyuki Miyamoto
Prof. Dr. Motoharu Matsuura
Guest Editors

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Keywords

  • optical wireless power transmission
  • laser power beaming
  • power over fiber
  • OWPT subsystem
  • OWPT system

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Published Papers (2 papers)

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19 pages, 832 KiB  
Article
Camera-Based Safety System for Optical Wireless Power Transmission Using Dynamic Safety-Distance
by Chen Zuo and Tomoyuki Miyamoto
Photonics 2024, 11(6), 500; https://doi.org/10.3390/photonics11060500 - 24 May 2024
Viewed by 397
Abstract
This paper introduces a new safety approach for Optical Wireless Power Transmission (OWPT), a technology that is integral to the new kinds of Wireless Power Transmission technology (WPT). It starts from the fundamental configuration of the current OWPT system, addressing the safety concerns [...] Read more.
This paper introduces a new safety approach for Optical Wireless Power Transmission (OWPT), a technology that is integral to the new kinds of Wireless Power Transmission technology (WPT). It starts from the fundamental configuration of the current OWPT system, addressing the safety concerns related to lasers by involving laser irradiation hazards, laser exposure regulation and guidelines, and a comparison with other safety methods. A camera-based OWPT safety system focused on the emission control of the light source is proposed, and it utilizes a depth camera and finely tuned computer vision-based control program. Through meticulous system design and experiments, the proposed system can detect moving objects in a limited indoor environment and control the laser/LED light transmission according to the object’s velocity dynamically. Various functions and exclusive improvements towards OWPT operation are mentioned, and Dynamic Safety-Distance is proposed as the core mechanism of the safety system. Through on-site experiments, indoor safety control and system operation’s evaluation are discussed, acknowledging both the advantages and limitations of the proposed safety system. This paper concludes with suggestions for further developments in camera-based OWPT safety incorporating the concept of Automatic Emission Control. Full article
22 pages, 14274 KiB  
Article
Real-Time Tracking of Photovoltaics by Differential Absorption Imaging in Optical Wireless Power Transmission
by Kaoru Asaba and Tomoyuki Miyamoto
Photonics 2024, 11(6), 490; https://doi.org/10.3390/photonics11060490 - 22 May 2024
Viewed by 375
Abstract
In the future, wireless power transmission is expected to cover power levels ranging from milliwatts to megawatts and over distances of a few meters to kilometers for both stationary and moving photovoltaic (PV) targets. Optical wireless power transmission (OWPT) is a promising solution [...] Read more.
In the future, wireless power transmission is expected to cover power levels ranging from milliwatts to megawatts and over distances of a few meters to kilometers for both stationary and moving photovoltaic (PV) targets. Optical wireless power transmission (OWPT) is a promising solution for such multi-scale systems, which use the narrow beam divergence of light. To enhance the efficiency of power generation in PV targets, real-time detection of the target’s position and attitude is crucial for OWPT systems. The authors propose detecting the PV using differential absorption images as one such method. This paper investigates algorithms for tracking moving PV targets and evaluates their performance. The first algorithm combines thresholds with an autoregressive (AR) model, while the other two use estimation with Kalman filters. The comparison of tracking algorithms can be undertaken using a score function based on the position estimation error. The evaluation results indicate that the AR model combined with thresholds, on average, outperforms the other models. There was no significant difference between the approach involving use of a Kalman filter to estimate positions based on a uniform motion model and the approach involving use of a Kalman filter to estimate the AR model. The authors’ series of studies, from a former high-level requirement study to the current target tracking using differential absorption imaging, has verified a concept for one of the crucial processes in OWPT. These works form a step toward the practical implementation of OWPT systems. Full article
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