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Resonance encode type passive wireless acoustic surface wave array sensor system

A surface acoustic wave, passive wireless technology, applied in the direction of impedance network, electrical components, etc., can solve problems such as difficult debugging and control, narrow closed-loop bandwidth, and inability to apply broadband control

Inactive Publication Date: 2004-08-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The circuit of the system is complex, difficult to debug and control, and the closed-loop bandwidth is narrow, so it cannot be applied to the wide-band control required by the sensor array

Method used

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  • Resonance encode type passive wireless acoustic surface wave array sensor system
  • Resonance encode type passive wireless acoustic surface wave array sensor system
  • Resonance encode type passive wireless acoustic surface wave array sensor system

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: Realize passive wireless multi-point temperature sensing with spatially discrete surface acoustic wave resonators and delay lines.

[0033] use figure 2 , Figure 5 with Figure 11 In the structure shown, the surface acoustic wave resonator whose resonant frequency is distributed in the amateur radio frequency band 433MHz is selected as the temperature sensitive element. If the measured temperature changes between -10°C and 200°C, the resonant frequency of the resonator will change within 300KHz, so the frequency range during transmission is 432.7MHz-433.3MHz. The excitation signal is excited by a PSK signal with an intermittent period of 2ms, and the sensor uses 50 identical surface acoustic wave resonators as sensitive elements, and the ports of each resonator pass through delay lines 1-delay line 50 with different delay times, matching networks and antennas connect. In this system, the fixed local oscillator uses a quartz crystal resonator with a r...

Embodiment 2

[0034] Example 2: Surface Acoustic Wave Array Sensor with Wireless Interrogation

[0035] use image 3 , Image 6 with Figure 11 In the shown structure, on the same piezoelectric substrate, resonators with different resonant frequencies and delay lines with different delay times are fabricated in different regions. These resonance frequencies are spaced apart from each other by a certain frequency. The ports of all these resonators are connected to the same antenna via delay lines. In this system, the oscillation frequency of the fixed local oscillator can be selected to be higher (or lower) than all resonator frequencies. The adjustable local oscillator is a digital frequency source with adjustable frequency. The computer controls the adjustable local oscillator to automatically capture the reflection response of all resonators to intermittent sinusoidal signals.

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Abstract

A resonance encode type acoustic surface-wave array sensor system is composed of a sensing unit and a signal inquiring, receiving and procesisng unit. Said sensing unit consists of multiple sensors or markers, which is composed of the acoustic surface-wave resonators with resonant frequencies distributed at same or different frequency points and the delay lines with different delay time, arranged with more different code arrangements, and arranged as same or different space positions. Said signal receiving and processing unit uses adjustable local oscillation controlled by computer. Its advantages are long acting distance and large encode scale.

Description

technical field [0001] The invention belongs to the technical field of surface acoustic wave sensing, in particular to a passive multi-or array sensor and a marker realized by more than one surface acoustic wave resonator (including a dual-port and a single-port resonator) and a delay line, and a A system for wireless signal query and non-contact acquisition and processing of multiple or array sensing signals or markers. technical background [0002] Since the 1980s, the United States, Germany, Japan and other countries have carried out research on surface acoustic wave passive wireless sensors. In published patents and technical documents, it has been reported that the use of surface acoustic wave components to realize passive sensors of various methods. Since the surface acoustic wave resonator has a higher quality factor (Q value) than other types of surface acoustic wave components, it is particularly suitable for passive wireless sensing applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/145
Inventor 文玉梅李平
Owner CHONGQING UNIV