Multi-target anti-collision coding method for delay line surface acoustic wave sensor
A surface acoustic sensor and surface acoustic wave technology, applied in the field of sensors, can solve the problems of delay line SAW tags and no thorough solution
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[0012] figure 1 is a schematic diagram of the sensor structure according to the arrangement order of the first reflective grating. The structure represented by IDT in the figure is an interdigital transducer, A is the No. 1 reflection grid, B is the No. 2 reflection grid, and C is the No. 3 reflection grid. A and B reflective gratings are close to each other for rough detection of sensing signals and to prevent phase ambiguity; C reflective gratings are farther away from B reflective gratings for phase detection of sensing signals, that is, high-sensitivity detection. The distances between A and B reflection grids of different sensors and the interdigital transducers increase sequentially, and the increased distance is based on the principle that no reflection signal aliasing occurs; the distance between the C reflection grid and the interdigital transducers is also in accordance with this principle . The reflective grids of all sensors are at different distances from the ID...
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