| With the gradual acceleration of China’s urbanization process,the construction of smart cities has gradually become an important measure for innovation-driven development and the establishment of green,lowcarbon and circular development.Among them,the construction of smart water is an indispensable link in the construction of smart cities,and the popularization of smart water meters has become a new trend in the development of smart water.At present,water data management has gradually changed from traditional mechanical water meter measurement and manual reading performance to intelligent meter reading and remote information return,which greatly improves the efficiency of urban water resources management.At present,most mature water data intelligent collection and remote transmission schemes transmit energy and information by power cable or wireless communication technology.With the development and maturity of optical fiber communication technology,optical fiber gradually reveals its advantages.Fiber bandwidth is high,low cost,in the presence of high voltage,strong magnetic field,electromagnetic pulse is not interfered with,it is especially suitable for the need for strict electromagnetic isolation or flammable and explosive special occasions.Fiber optic cotransmission technology is an energy supply technology based on fiber as an energy transmission medium,which has the advantages of stable energy supply,anti-electromagnetic interference and easy deployment.Therefore,it is of practical application value to study a water measurement system which can realize remote automatic measurement and adapt to harsh environment interference by using fiber optic cocommunication technology.In this paper,based on the optical fiber cotransmission technology,the key technologies of the optical fiber cotransmission water measurement scheme are studied.From the perspective of practical engineering application,the optical fiber cotransmission and passive optical network technology are combined,and the optical fiber of the optical fiber cotransmission system and the optical fiber link of the passive optical network system are coupled.A water measurement system based on optical fiber energy and communication technology is designed and implemented.The main research contents and innovative achievements are as follows:(1)Using the theoretical knowledge of the optical fiber energy transmission system combined with the actual water measurement requirements,the overall scheme of the optical fiber energy transmission water measurement system is designed,including the analysis and selection of the laser,energy transmission fiber and photovoltaic cell in the optical fiber energy transmission system,as well as the circuit design and implementation of the water measurement terminal equipment.On this basis,the optical fiber cotransmission water measurement system is implemented and built as a whole,and the system is tested and analyzed.The error between the optical fiber cotransmission water measurement system and the mechanical water meter meets the actual measurement requirements.(2)Based on the current development status of optical access network technology,the optical fiber co-communication system and PON access network technology are combined to design the overall scheme of Ponbased optical fiber co-communication water measurement system.The energy transfer fiber is coupled to the fiber link of the PON access network through the WDM;The photovoltaic cell uses a photodiode to achieve photoelectric conversion,and the micro-energy collection module is added to the water measurement terminal to realize the collection and storage of micro-watt electrical power energy.Under the condition of ensuring the normal operation of the PON access network system,the remote water quantity can be measured automatically and the result can be returned.The error between the measured result and the measurement result of the mechanical water meter can meet the actual measurement requirements.It effectively reduces the difficulty of laying the system and the overall cost,and improves the practicability of the research content. |
