Passive wireless ASW muti-sensor system and its frequency-division recognition method

A surface acoustic wave and multi-sensor technology, applied in radio wave measurement system, ultrasonic/acoustic wave/infrasonic wave transmission system, radio wave reflection/re-radiation, etc., can solve difficult debugging and control, cannot apply multi-sensor and sensor array Broadband control, complex circuits, etc.

Inactive Publication Date: 2002-08-14
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 multi-sensors and sensor arrays

Method used

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  • Passive wireless ASW muti-sensor system and its frequency-division recognition method
  • Passive wireless ASW muti-sensor system and its frequency-division recognition method
  • Passive wireless ASW muti-sensor system and its frequency-division recognition method

Examples

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Embodiment 1

[0025] Embodiment 1: Realize passive wireless multi-point temperature sensing with spatially discrete surface acoustic wave resonators.

[0026] The surface acoustic wave resonator whose resonant frequency is distributed in the amateur radio frequency band from 430MHz to 440MHz is selected as the temperature sensitive element. If the measurement temperature changes between -10°C and 200°C, the resonant frequency of the resonator will change within 300KHz. Therefore, a total of 30 surface acoustic wave resonators can be used as sensitive elements in this frequency range. The ports are connected through matching networks and antennas, such as figure 2 and Figure 6 shown. In this instrument system, the fixed local oscillator LCO1 uses a quartz crystal resonator with a resonant frequency of 429.70MHz, the adjustable local oscillator LCO2 is a digital frequency source, and the NI5401 16MHz PCI interface function generator is selected and connected to the PIII600 personal comput...

Embodiment 2

[0027] Example 2: Surface Acoustic Wave Array Sensor with Wireless Interrogation

[0028] On the same piezoelectric substrate, resonators with different resonant frequencies 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. The instrument system of the array sensor consists of image 3 and Figure 6 As shown, the oscillation frequency of the fixed local oscillator LCO1 can be selected to be higher (or lower) than all resonator frequencies. The adjustable local oscillator LCO2 is a digital frequency source with adjustable frequency.

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Abstract

The invention relates to multi-sensing system of passive wireless acoustic surface wave and recognition method of frequency division used in the system. Multi resonators of acoustic surface wave with their resonant frequency being distributed at different resonance point are as multi sensors. Reception and treatment of the signal are as follows: an adjustable local oscillation controlled by computer program is connected to power amplifier through receiving and transmitting switches, sending a query signal: passing antenna, receiving and transmitting switches, radio frequency amplifier, band-pass filter, A/D converter, the echo wave of said query signal enters computer. Since the query signal with different frequencies being produced by local oscillation controlled by computer program, and the sensing signals being produced by multi resonators for acoustic surface wave, thus only one system can recognize and query more signals sensed in a monitored environment.

Description

technical field [0001] The invention belongs to the technical field of surface acoustic wave sensing, and in particular relates to a passive multi- or array sensor realized by using more than one surface acoustic wave resonator (including dual-port and single-port resonators), and a wireless signal query and non-conductive sensor. Get in touch with the instrument system that acquires and processes multiple (array) sensor signals, and the method of frequency division identification of multiple sensors adopted by the system. 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 ty...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/75H04B11/00
Inventor 李平文玉梅黄尚廉
Owner CHONGQING UNIV
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