Method for identifying array element of surface acoustic wave passive wireless array

Abstract

The invention belongs to the field of intellectualized and networked sensing monitoring, relating to a method for identifying an array element of a surface acoustic wave passive wireless array. The method comprises the steps as follows: determining an available space set according to the region size of the surface acoustic wave sensor array, the region size of a reader writer antenna, the distance between the two regions and distribution of monitoring points; placing a sensing element composed of a surface acoustic wave sensor and an antenna connected with the sensor at each monitoring point in the space set; dividing a sensor array according to the wave beam range of the reader writer antenna, so as to form a space diversity of the array; further dividing the space diversity of each array according to the requirement of polarization isolation of sensor antennae, dividing sensing elements in the same space diversity into different polarity diversities according to a polarization anglecapable of discriminating the same frequency, wherein the polarization angles of the antennae of the sensing elements contained in each polarity diversity are the same; and allocating a reader writerprovided with multiple antennae to each space diversity, wherein the reader writer communicates with the sensing element by time division multiplexing and frequency division multiplexing. The invention can improve the capability of a system to contain surface acoustic wave sensor terminals, thus causing the system to support more sensor terminals in the field of intellectualized and networked sensing monitoring.

Description

technical field [0001] The invention relates to the field of intelligent and networked sensing and monitoring, in particular to an array element identification method of a surface acoustic wave passive wireless sensor array. Background technique [0002] Today, with the rapid development of the Internet of Things and smart grids, sensors are widely used for real-time diagnosis and monitoring of sensing objects. The surface acoustic wave sensor is a new type of sensor developed in the past ten years, which can realize sensors for measuring parameters such as mechanical strain, flow, stress, gas, angular velocity, acceleration, small displacement, and temperature. Its application technology for small-scale and ideal scene environments is relatively mature. In large-scale scenes, the disclosed technology mainly uses coded surface acoustic wave devices. For coded-delay SAW devices, the time delay or phase change between the excitation signal and the received signal is mainly us...

AI Technical Summary

Problems solved by technology

However, for practical engineering applications, the structure of resonant coding devices is complex and the process is difficult, resulting in expensive surface acoustic wave devices, and the complexity of coding and decoding leads to high design costs of software and hardware for the entire sensing system. It is difficult to popularize and apply under realistic conditions.

[0003] In the face of market demand, for distributed surface acoustic wave sensor arrays, among the existing solutions, purely resonant devices are difficult to solve the problem of distinguishing sensor elements in large-scale arrays, and resonant coding devices cannot avoid technical difficulties and high costs On the other hand, the existing technology in the surface acoustic wave passive wireless sensing system has not fully exploited the potential of the sensing antenna's directional characteristics and polarization characteristics

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