Method and system for improving detection accuracy of delay line surface acoustic wave (Surface Acoustic Wave) sensor

A surface acoustic wave and delay line type technology, which is applied in the field of improving the detection accuracy of a delay line type surface acoustic wave sensor, can solve problems such as phase ambiguity discussion, and achieves overcoming the phase ambiguity problem, with a small amount of calculation and improved demodulation accuracy. Effect

Inactive Publication Date: 2013-05-08
CHONGQING UNIV
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Problems solved by technology

Du Feng and others only mentioned the phase offset of phase demodulation, but did not discuss the phase ambiguity

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  • Method and system for improving detection accuracy of delay line surface acoustic wave (Surface Acoustic Wave) sensor
  • Method and system for improving detection accuracy of delay line surface acoustic wave (Surface Acoustic Wave) sensor
  • Method and system for improving detection accuracy of delay line surface acoustic wave (Surface Acoustic Wave) sensor

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Embodiment Construction

[0058] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0059] figure 1 It is a structural diagram of a delay line type SAW chip; figure 2 is the sensor system structure; image 3 SAW chip echo signal measured by vector analyzer; Figure 4 A block diagram of the sub-system of the reader; Figure 5 is the receiver structure; Figure 6 is the spectrum shift after bandpass sampling; Figure 7 It is the reply signal of the delayed SAW chip obtained from the hardware circuit; Figure 8 is the influence of initial delay difference and signal frequency on phase measurement; Figure 9 is the relationship between phase difference, time delay difference and the measured object; Figure 10 is the relationship diagram between ph...

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Abstract

The invention discloses a method and a system for improving the detection accuracy of a delay line surface acoustic wave (Surface Acoustic Wave) sensor and relates to a detection method and a detection system of the SAW sensor. The method for improving the detection accuracy of the delay line SAW sensor comprises the following steps of: 1, firstly searching a corresponding relation that delay time and a phase are changed with a measured temperature; 2, then establishing a corresponding relation between the measured temperature and a delay time difference as well as a phase difference; 3, and finally obtaining a corresponding relation between the phase difference and the measured temperature. In the invention, the demodulation of delay time measurement and the demodulation of phase measurement are combined; the advantage of accurate demodulation of the phase is essentially utilized; the demodulation process has small calculated amount; the method and the system are convenient to implement in an FPGA (Field Programmable Gate Array); the demodulation accuracy is improved; the problem of phase ambiguity in the phase demodulation process of the delay line SAW sensor is solved; and by utilizing the method, the effects that the temperature detection accuracy can reach 0.05 DEG C and the temperature detection range is at least in the range of 0 DEG C to 50 DEG C are realized, so the problem of phase ambiguity really can be solved by combining the delay time measurement and the phase measurement to carry out demodulation.

Description

technical field [0001] The invention relates to a SAW sensor detection method and system, in particular to a method for improving the detection accuracy of a delay line surface acoustic wave sensor. Background technique [0002] At present, due to the simple structure, small size, light weight, good stability, wireless connection, no power drive and high sensitivity of the surface acoustic wave sensor, it can be used in a variety of complex and harsh environments. Since the 1980s, the United States, Germany, Japan and other countries have carried out extensive research on surface acoustic wave wireless passive sensors. In published patents and technical documents, various methods of using surface acoustic wave devices to realize wireless passive sensors have been reported. The surface acoustic wave sensor adopts surface acoustic wave sensing technology to obtain working energy directly from the radio frequency signal, without the need to integrate a power drive circuit, the ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/22
Inventor 刘丹平刘亚刘晓明胡学斌汪梦柔蒋阳曾孝平冯文江印勇
Owner CHONGQING UNIV
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