| As an extension of the sensing technology,the video monitoring system can accurately record the situation on the spot in real time,and its role in supervision and maintenance has become more and more obvious.With the continuous expansion of the transmission field and communication distance of the monitoring system,higher requirements have been put forward for the monitoring range and target number of the video monitoring system.In order to meet the application requirements,panoramic video monitoring has gradually developed.At present,the video monitoring equipment is generally separated from the information processing center,and the two parties are connected by cables.However,it is not easy to lay the cables in some harsh environments,and the monitoring lines are relatively short.At the same time,due to the lack of power supply of the system in a special environment,the stability of equipment operation and the quality of image transmission are reduced.In order to overcome this problem,this paper adopts Power-over-Fiber as the power supply scheme of the video monitoring system.Power-over-fiber(Po F),as a novel energy supply method,transmits laser energy through insulated optical fiber and then converts it into electric energy through photovoltaic cells,which can provide stable energy supply for remote equipment to ensure the reliability and stability of sensing equipment.This article focuses on the research of video monitoring system based on power-over-fiber,introduces the composition principle of power-over-fiber system,and analyzes the main factors that affect the efficiency of the system.A scheme for characterizing the performance of high-power photovoltaic cells was designed to measure the output maximum power point without affecting the structure of photovoltaic cells.At the same time,an adjustable power management module based on the maximum power point tracking(MPPT)technology was designed and manufactured,which could carry out the impedance matching with different photovoltaic cells to ensure that the photovoltaic cells always work near the Maximum power point.The conversion efficiency of this module can reach up to 86%.Finally,in order to reduce the power consumption of the video monitoring system,the camera module,the remote processing unit and the optical transceiver were studied and optimized.Designed and built a set of video monitoring system based on power-over-fiber,which can provide about 1.61 W electric power for the video monitoring system1 km away(System efficiency is 31.2%),and return the collected high-definition panoramic video for display. |
