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

Active Publication Date: 2016-03-30
SALISENSE TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The problem of multi-target anti-collision has always been a problem for delay-line SAW tags, and there is still no complete solution

Method used

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  • Multi-target anti-collision coding method for delay line surface acoustic wave sensor
  • Multi-target anti-collision coding method for delay line surface acoustic wave sensor

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Embodiment Construction

[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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Abstract

The invention relates to a multi-target anti-collision coding method of delay line type SAW (surface acoustic wave) sensors. According to the method, the piezoelectric substrate of every SAW sensor is provided with three reflecting gratings, wherein distances between the three reflecting gratings of different sensors and an interdigital transducer are mutually different, and two arrangement sequences are provided from small to large. The first sequence is that the number 1 reflecting grating and the number 2 reflecting grating of the first sensor, the number 1 reflecting grating and the number 2 reflecting grating of the second sensor,..., the number 1 reflecting grating and the number 2 reflecting grating of the Nth sensor, then the number 3 reflecting sensor of the first sensor, the number 3 reflecting sensor of the second sensor,..., the number 3 reflecting sensor of the Nth sensor. The second sequence is that the number 1 reflecting grating of the first sensor, the number 2 reflecting grating of the second sensor,..., the number 1 reflecting grating of the Nth sensor, then the number 2 reflecting grating and the number 3 reflecting grating of the first sensor, the number 2 reflecting grating and the number 3 reflecting grating of the second sensor,..., and the number 2 reflecting grating and the number 3 reflecting grating of the Nth sensor.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a multi-target recognition method of a delay line surface acoustic wave sensor. Background technique [0002] Delayed line surface acoustic wave (SAW) sensors can be used to detect physical quantities such as temperature, pressure, gas, and humidity. They are mainly composed of piezoelectric substrates, interdigital transducers, and reflective grids. Its working principle is: the electromagnetic signal received by the sensor is transformed into a mechanical vibration wave propagating along the piezoelectric substrate through the interdigital transducer, that is, the surface acoustic wave. When the surface acoustic wave meets the reflection grid, part of the signal will be reflected back. The reflected signal is then converted into an electrical signal by the interdigital transducer. The response time of the reflected signal is determined by the position of the reflective grid, but it is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/48
Inventor 王东方
Owner SALISENSE TECH
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