Unmanned aerial vehicle terminal laser energy transfer system based on three-stage tracking and light field regulation and control

Abstract

The invention discloses an unmanned aerial vehicle terminal laser energy transfer method based on three-level tracking and phase modulation. An unmanned aerial vehicle terminal laser energy transfer system disclosed in the invention comprises a high-power laser, a collimating beam expander for collimating and expanding laser, a tracking galvanometer unit for coarse tuning tracking of a transmitting end, a communication module for information transmission between the transmitting end and an unmanned aerial vehicle, a polarizing film, a spatial light phase modulation diaphragm, the unmanned aerial vehicle, a terminal five-axis rotary table used for visual self-alignment and arranged on the unmanned aerial vehicle, and a photovoltaic cell array, wherein laser emitted by the high-energy laseris collimated and expanded through the collimating beam expander, and coarse adjustment tracking of the laser to the unmanned aerial vehicle is conducted through the tracking galvanometer unit; the spatial light phase modulation diaphragm is arranged at the transmitting end and is combined with real-time feedback of a light field optimization method to modulate a Gaussian light field so as to adapt to any arrangement of photovoltaic cells; the tracking galvanometer unit enables laser spots to be aligned with the photovoltaic cells; the terminal five-axis rotary table arranged on the unmanned aerial vehicle at a receiving end performs fine tuning tracking on the photovoltaic cell array to achieve an optimal receiving angle and an optimal receiving position; and the photovoltaic cell array is arranged on the terminal five-axis rotary table and is used for receiving modulated laser energy.

Description

technical field [0001] The invention relates to a technology in the field of high-energy laser wireless energy transmission, in particular to a wireless laser energy transmission system for UAV terminals based on three-level tracking and light field regulation. Background technique [0002] High-energy laser wireless power transmission technology (Optical wireless powertransmission, OWPT) is a technology that uses laser as a carrier, that is, the transmitting end converts electrical energy into laser energy and transmits it to the receiving end, and the receiving end converts light into electrical energy for charging. However, the efficiency of the photovoltaic cell used in the existing transmitting end is about 10-20%, which is far below the requirements of practical applications, and cannot fully utilize the high-energy laser energy. The main limiting factors of terminal photoelectric conversion efficiency are the terminal laser energy distribution and the adaptation of ph...

AI Technical Summary

Problems solved by technology

However, the efficiency of photovoltaic cells used in the existing transmitting end is about 10-20%, which is far below the requirements of practical applications, and the high-energy laser energy cannot be fully utilized.

The main limiting factors of terminal photoelectric conversion efficiency are the terminal laser energy distribution and the adaptation of photovoltaic cells

At present, the Gaussian beam is mainly shaped into a flat-top beam by light field regulation to improve the photoelectric conversion efficiency. However, it has not matched the arbitrary arrangement of photovoltaic cells, nor avoided the dead zone at the electrode connection.

The energy distribution of the laser beam is not uniform, and the hot spot effect generated will also lead to a decrease in the efficiency of the photovoltaic cell receiver

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