Solar Cell Detection and Position, Attitude Determination by Differential Absorption Imaging in Optical Wireless Power Transmission

Asaba, Kaoru; Miyamoto, Tomoyuki

doi:10.3390/photonics10050553

Cited by 5 publications

(13 citation statements)

References 15 publications

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“…Position Set 1 = (−8, 27), (−4, 27), (−2, 27), (−1, 27), (0, 27), (1, 27), (2, 27), (4, 27), (8, 27) Position Set 2 = (0, 27), (0, 26), (0, 25), (0, 23), (0, 19) Position Set 3 = (−6, 9), (−4, 11), (−2, 13), (−1, 14), (0, 15), (1, 16), (2, 17), (4, 19), (8,23) Typical parameters in this experiment are summarized in Table 1. Figure 2 shows the procedure of generating the range information, which is the Ycoordinate of the target on the 2D plane.…”

Section: Experiments Configuration and Coordinate Systemmentioning

confidence: 99%

“…Generally, increasing the received power is equivalent to increasing the irradiated power, etc. [15]. In this case, it is equivalent to increasing the exposure time in Figure 14.…”

Section: Gaas Pvmentioning

confidence: 99%

“…One of the candidates for robust PV detection is the differential absorption technique. It is used in many technical areas [11][12][13], and this has been applied to OWPT by the authors [14,15]. In this method, two independent images are captured with absorbable (λ ON ) and non-absorbable (λ OFF ) wavelengths of the PV.…”

Section: Introductionmentioning

confidence: 99%

“…These were a diffuse characteristic and a mixed one of diffuse and specular characteristics. Also, angular characteristics were measured for the estimation of the center coordinates and the area size of the targets [15].…”

Section: Introductionmentioning

confidence: 99%

“…Compared with Figure 4, the minimum exposure time of convergence for both C1 and C2 became longer. The threshold equation proposed in [15] predicts that the ratio of the convergence time in Figure 10 to those in Figure 4 gives the λ OFF transmission efficiency of the equipment. The mean value over Position Sets 1, 2, and 3 is 0.124, and this is close to the above-estimated 0.135.…”

Section: Introducing Coaxial Opticsmentioning

confidence: 99%

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Positioning of a Photovoltaic Device on a Real Two-Dimensional Plane in Optical Wireless Power Transmission by Means of Infrared Differential Absorption Imaging

Asaba,

Miyamoto

2023

Photonics

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In optical wireless power transmission (OWPT), detection and positioning of the photovoltaic device (PV) in real space is essential before power transmission. One of the candidates for the robust detection of PVs is differential absorption imaging, which has been proposed by the authors. In this method, raw images are captured using absorbable (λON) and non-absorbable (λOFF) wavelengths of the PV. Then, the PV is detected from the differential image of these. In this report, the positioning of a PV on a real two-dimensional plane was investigated by means of this differential imaging. Primarily, stereo imagery was utilized for positioning. Non-stereo positioning was also investigated, in which the azimuth angle (direction) was estimated from the position of the PV in the differential image, and ranging was performed using its apparent size. There are diffuse and non-diffuse (specular) options for the λOFF reflection of the rear surface of the PV. Positioning accuracy was measured with regard to this characteristic as well as the attitude angle. Especially for a PV with specular characteristics, even though its positioning accuracy was affected by its attitude angle, the accuracy could be improved by increasing the irradiation light power. On the other hand, direction determination was stable for a wide angular range of attitudes.

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Section: Experiments Configuration and Coordinate Systemmentioning

confidence: 99%

“…Generally, increasing the received power is equivalent to increasing the irradiated power, etc. [15]. In this case, it is equivalent to increasing the exposure time in Figure 14.…”

Section: Gaas Pvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introducing Coaxial Opticsmentioning

confidence: 99%

See 3 more Smart Citations

Positioning of a Photovoltaic Device on a Real Two-Dimensional Plane in Optical Wireless Power Transmission by Means of Infrared Differential Absorption Imaging

Asaba,

Miyamoto

2023

Photonics

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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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Ultra-Wideband High-Efficiency Solar Absorber and Thermal Emitter Based on Semiconductor InAs Microstructures

et al. 2023

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Since the use of chemical fuels is permanently damaging the environment, the need for new energy sources is urgent for mankind. Given that solar energy is a clean and sustainable energy source, this study investigates and proposes a six-layer composite ultra-wideband high-efficiency solar absorber with an annular microstructure. It achieves this by using a combination of the properties of metamaterials and the quantum confinement effects of semiconductor materials. The substrate is W–Ti–Al2O3, and the microstructure is an annular InAs-square InAs film–Ti film combination. We used Lumerical Solutions’ FDTD solution program to simulate the absorber and calculate the model’s absorption, field distribution, and thermal radiation efficiency (when it is used as a thermal emitter), and further explored the physical mechanism of the model’s ultra-broadband absorption. Our model has an average absorption of 95.80% in the 283–3615 nm band, 95.66% in the 280–4000 nm band, and a weighted average absorption efficiency of 95.78% under AM1.5 illumination. Meanwhile, the reflectance of the model in the 5586–20,000 nm band is all higher than 80%, with an average reflectance of 94.52%, which has a good thermal infrared suppression performance. It is 95.42% under thermal radiation at 1000 K. It has outstanding performance when employed as a thermal emitter as well. Additionally, simulation results show that the absorber has good polarization and incidence angle insensitivity. The model may be applied to photodetection, thermophotovoltaics, bio-detection, imaging, thermal ion emission, and solar water evaporation for water purification.

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Solar Cell Detection and Position, Attitude Determination by Differential Absorption Imaging in Optical Wireless Power Transmission

Cited by 5 publications

References 15 publications

Positioning of a Photovoltaic Device on a Real Two-Dimensional Plane in Optical Wireless Power Transmission by Means of Infrared Differential Absorption Imaging

Positioning of a Photovoltaic Device on a Real Two-Dimensional Plane in Optical Wireless Power Transmission by Means of Infrared Differential Absorption Imaging

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

Ultra-Wideband High-Efficiency Solar Absorber and Thermal Emitter Based on Semiconductor InAs Microstructures

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