Relaxation of Beam Irradiation Accuracy of Cooperative Optical Wireless Power Transmission in Terms of Fly Eye Module with Beam Confinement Mechanism

Asaba, Kaoru; Miyamoto, Tomoyuki

doi:10.3390/photonics9120995

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…In the case of a cooperative OWPT system, the transmitter sends direction data to the receiver, enabling the receiver to control its attitude. This concept validates the proposed cooperative OWPT approach from an operational standpoint 4,12 . Conversely, in noncooperative OWPT systems, where no cooperative relationship exists between the target and the transmitter, the transmitter needs to determine the attitude of the target, which can be accomplished using the integrity measure.…”

Section: Discussionsupporting

confidence: 73%

Solar cell position, attitude determination by differential absorption imaging in optical wireless power transmission

Asaba,

Miyamoto

2024

Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIII

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Since optical wireless power transmission (OWPT) transmits light and generates power at remote targets, determining the position and attitude of the photovoltaic device (PV) from the transmitter is essential before power transmission. PV is robustly detected in various background illuminations utilizing the proposed differential absorption imaging, utilizing the intrinsic nature of PV as a semiconductor. In this method, images are captured using the absorbable and non-absorbable wavelengths of PV, and it is detected from the differential image of these wavelengths. Position estimation was investigated using stereo imagery with a set of conditions implying consistency between images captured by two independent sensors on the left and right. There is a minimum exposure time of the image sensor to ensure that these consistency conditions converge to certain values. It is strongly correlated with the positioning accuracy of the targets and also depends on the attitude angle of the target. Using these features of the minimum exposure time, the position and attitude of the targets were determined even in the case of an incomplete target image. There are diffuse and non-diffuse (specular) options for the reflection of the rear surface of the PV, and positioning accuracy is affected by these reflection characteristics. Experiments were conducted on a 33 × 23-inch optical bench. In the case of a specular target, although positioning accuracy was affected by attitude, its position was estimated within about a 2-inch error in a 20-degree full angular range, while its attitude was estimated within about a 10-15 degree error in a 60-degree full angular range.

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Section: Discussionsupporting

confidence: 73%

Solar cell position, attitude determination by differential absorption imaging in optical wireless power transmission

Asaba,

Miyamoto

2024

Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XIII

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“…The laser wireless power transmission (WPT) is a WPT technology using laser as the power transmission medium, and the transmission distance can reach several kilometers, with a small loss, a high transmission efficiency, and a compact transmission device [1][2][3][4][5]. Owing to these advantages, it is widely used in long-endurance unmanned aerial vehicles, unmanned boats, unmanned submarines, robotic fish, and other mobile electric facilities and has become a popular field of competing research [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimentation and Analysis of Intra-Cavity Beam-Splitting Method to Enhance the Uniformity of Light in the Powersphere

He,

Pan,

Zheng

et al. 2024

Photonics

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The powersphere is a spherical enclosed receiver composed of multiple photovoltaic cells. It serves as a replacement for traditional photovoltaic panels in laser wireless power transmission systems for optoelectronic conversion. The ideal powersphere aims to achieve a uniform distribution of light within the cavity through infinite reflections, reducing energy losses in the circuit. However, due to the high absorption rate of the photovoltaic cells, the direct irradiation area on the inner surface of the powersphere exhibits a significantly higher light intensity than the reflected area, resulting in a suboptimal level of light uniformity and certain circuit losses. To address the aforementioned issues, a method of intra-cavity beam splitting in the powersphere is proposed. This solution aims to increase the area of direct illumination and reduce the intensity difference between direct and reflected lights, thereby improving the light uniformity on the inner surface of the powersphere. Utilizing the transformation matrix of Gaussian beams, the q parameters for each optical path with beam splitting were calculated, and the equality of corresponding q values was demonstrated. Further, based on the q parameter expression for the electric field of Gaussian beams, the intensities for each optical path were calculated, and it was demonstrated that their values are equal. Additionally, an optical software was utilized to establish a model for intra-cavity beam splitting in the powersphere. Based on this model, a beam-splitting system was designed using a semi-transparent and semi-reflective lens as the core component. The light uniformity performance of the proposed system was analyzed through simulations. To further validate the effectiveness of the calculations, design, and simulations, multiple lenses were employed to construct the beam-splitting system. An experimental platform was set up, consisting of a semiconductor laser, monocrystalline silicon photovoltaic cells, beam expander, Fresnel lens, beam-splitting system, and powersphere. An experimental verification was conducted, and the results aligned with the theoretical calculations and simulated outcomes. The above theory, simulations, and experiments demonstrate that the intra-cavity beam-splitting method effectively enhances the optical uniformity within the powersphere.

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“…An increasing number of researchers have become involved in this emerging technology. It eliminates the need for dragging long cables; therefore, laser wireless power transmission (WPT) technology offers a more convenient, comfortable, and enriched lifestyle for humanity [6][7][8][9][10]. With the continuous development and maturation of laser wireless power transmission technology, it will become fully integrated into people's lives, providing power supply for personal electronic devices, wearable/implantable electronic devices, household appliances, and electric vehicles, among other devices [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experiment of Laser Energy Distribution of Laser Wireless Power Transmission Based on a Powersphere Receiver

Zheng

et al. 2023

Photonics

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Laser wireless power transmission (WPT) is one of the most important technologies in the field of long-range power transfer. This technique uses a laser as a transmission medium instead of conventional physical or electrical connections to perform WPT. It has the characteristics of long transmission distance and flexible operation. The existing laser wireless power transmission system uses photovoltaic cells as a receiver, which convert light into electricity. Due to the contradiction between the Gaussian distribution of laser and the uniform illumination requirements of photovoltaic cells, the laser wireless power transmission technology has problems such as low transmission efficiency and small output power. Therefore, understanding the energy distribution changes in the laser during transmission, especially the energy change after the laser is transmitted to each key device, and analyzing the influencing factors of the energy distribution state, are of great significance in improving the transmission efficiency and reducing the energy loss in the system. This article utilizes the optical software Lighttools as a tool to establish a laser wireless power transmission model based on a powersphere. This model is used to study the energy distribution changes in the laser as it passes through various components, and to analyze the corresponding influencing factors. To further validate the simulation results, an experimental platform was constructed using a semiconductor laser, beam expander, Fresnel lens, and powersphere as components. A beam quality analyzer was used to measure and analyze the laser energy distribution of each component except for the powersphere. The output voltage and current values of various regions of the powersphere were measured using a multimeter. The energy distribution of the powersphere was reflected based on the linear relationship between photo-generated current, voltage, and light intensity. The experimental results obtained were in good agreement with the simulation results. Simulations and experiments have shown that using a beam expander can reduce divergence angle and energy loss, while employing large-aperture focusing lens can enhance energy collection and output power, providing a basis for improving the efficiency of laser wireless power transfer.

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Relaxation of Beam Irradiation Accuracy of Cooperative Optical Wireless Power Transmission in Terms of Fly Eye Module with Beam Confinement Mechanism

Cited by 7 publications

References 22 publications

Solar cell position, attitude determination by differential absorption imaging in optical wireless power transmission

Solar cell position, attitude determination by differential absorption imaging in optical wireless power transmission

Experimentation and Analysis of Intra-Cavity Beam-Splitting Method to Enhance the Uniformity of Light in the Powersphere

Analysis and Experiment of Laser Energy Distribution of Laser Wireless Power Transmission Based on a Powersphere Receiver

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