Research And Application Of Signal Interference Avoidance Between Infrared Sensors

In the application of security monitoring,the use of infrared sensor takes up a large proportion,and the active-to-target infrared sensor in infrared sensor is widely used in the security monitoring system because of its advantages in outdoor use.The active-to-target infrared sensor is made up of infrared transmitters and receivers.The transmitter is responsible for sending infrared signals.The receiver receives infrared signals from the transmitter,therefore,it is necessary to judge whether the security monitoring system has been invaded by the standard of whether the receiver can receive the full infrared signal from the transmitter.Infrared sensor has the disadvantage of easy to be interfered,and active infrared sensor is no exception.The active infrared sensor has two main interference sources,one is from outside interference,such as sunlight,leaves,etc.,the other is the interference of infrared lines between infrared sensors due to cross-propagation.The external interference problem can be solved basically by improving the hardware condition,and the infrared cross-interference between infrared sensors is difficult to solve.In this thesis,an infrared cross-interference avoidance algorithm between infrared sensors is proposed,to solve the problem of infrared cross-interference between infrared sensors effectively,it can also save the cost of the system by applying it to the security monitoring system.Firstly,the realization technology of infrared sensor is reviewed,and the existing interference avoidance method is analyzed,and a new jamming avoidance Algorithm is proposed.The algorithm design idea is divided into two parts,one is to send the data of the transmitter to distribute in groups,and to add an interval between each set of data,so that ensure each infrared sensor in application is able to transmit data;the other part is to stop sending data after an infrared sensor receives the correct data,focusing only on receiving the data to ensure the same time period,only one infrared line between the two infrared sensors was sent,so that the infrared rays sent by the two infrared sensors did not cross,thus avoiding cross-interference from the infrared.Based on the new algorithm of infrared cross-interference avoidance,a security monitoring system is designed.The system constructs a closed security monitoring area and has an intrusion warning function and infrared sensor intrusion warning function.The experiment and performance analysis show the correctness and efficiency of the Algorithm,and the effectiveness of the monitoring system.