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

A surface acoustic wave, passive wireless technology, applied in the direction of electrical components, impedance networks, etc., can solve the problem of not giving full play to the directional characteristics and polarization characteristics of the sensing antenna, and the resonant coding device cannot avoid technical difficulties, and the resonant coding device Complicated structure and other issues, to achieve the effect of reducing the scale of reading and writing equipment, facilitating popularization and application, and good security and stability

Inactive Publication Date: 2012-11-21
武汉烽火富华电气有限责任公司
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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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  • Method for identifying array element of surface acoustic wave passive wireless array
  • Method for identifying array element of surface acoustic wave passive wireless array
  • Method for identifying array element of surface acoustic wave passive wireless array

Examples

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Embodiment 1

[0033]The surface acoustic wave temperature sensor is selected for temperature monitoring of capacitor banks in substations. Most of the equipment failures and abnormalities in the power system are initially accompanied by local or overall overheating or relatively abnormal temperature distribution. The substation is located in the middle link of the power system, and the capacitor is the most monitored point in the substation, and the possibility of problems is relatively large. Once a failure occurs, it will affect the power supply of the entire region, causing huge economic losses and becoming a major Therefore, it is very necessary to monitor the temperature of the capacitor on line in real time. However, the capacitor temperature monitoring points are numerous and densely distributed, and the capacitor itself is in an environment of high voltage, strong magnetic field and extremely strong electromagnetic interference. The harsh on-site environment brings great difficulti...

Embodiment 2

[0035] to combine Figure 4 , this example uses image 3 The 1-to-6 basic multiplexing structure realizes 4-to-24 multiplexing through polarization diversity. Area A is the reader antenna area, which is composed of 4 reader antennas and forms an array in this area through polarization diversity. Area B is the sensor antenna array area, which is composed of 24 antennas, and each 6 antennas is a small diversity group, and the polarization directions of the 4 diversity groups are separated by 45°. The 4 small diversity sets form the polarization diversity set. The polarization direction of each diversity is the same as the polarization direction of the reader-writer antenna it faces.

Embodiment 3

[0037] to combine Figure 5 , this example is the same as image 3 The difference lies in the realization of a larger sensor antenna array through spatial multiplexing on the basis of utilizing polarization diversity. Practical applications Figure 5 The range of the free space in area A shown is relatively large, and the spatial isolation of the reader-writer antenna assembly can be realized to be large. Figure 4 The sensor antenna array in the middle B area is relatively large, making full use of the orientation of the antenna and the spacing between the sensor arrays, and adding spatial spacing isolation on the basis of directional isolation to prevent interference between signals.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/145
Inventor 刘文王磊蒋进京胡鹏余菲
Owner 武汉烽火富华电气有限责任公司
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