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

In optical wireless power transmission, position, size, and attitude of photovoltaic device (PV) must be determined from light source. A method proposed in the previous report is based on selective absorption characteristics PV, it detected by differentiating images strongly absorbable wavelength one not. this study, using two infrared wavelengths, kinds targets were differential imaging. One was a GaAs substrate which simulates diffuse rear surface, other real PV. It found that substrate’s reflective characteristic diffuse, solar cell’s mainly non-diffuse accompanied small component supporting wide-angle reflection. Using feature, position cell could within wide range angle. Its also with an accuracy ±10 degrees to its normal. The angles, determination exploiting varying apparent size tilt Broad reflection enabled for range, around normal would erroneous.