Data measurement method and device based on surface acoustic wave sensor

A surface acoustic wave and data measurement technology, applied in the field of sensing, can solve the problems of long sensing time and poor measurement accuracy, and achieve the effects of high measurement accuracy, narrow occupied frequency band, and shortened sensing time

Active Publication Date: 2016-10-05
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems of long sensing time and poor measurement accuracy in the prior art, the present invention proposes a data measurement method and device based on a surface acoustic wave sensor

Method used

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  • Data measurement method and device based on surface acoustic wave sensor
  • Data measurement method and device based on surface acoustic wave sensor
  • Data measurement method and device based on surface acoustic wave sensor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the data measurement method based on the surface acoustic wave sensor includes:

[0038] Step S101: Transmit electromagnetic waves to the surface acoustic wave sensor, and receive the return power of the surface acoustic wave sensor;

[0039] Step S102: Increase the transmission frequency according to the preset first frequency sweep step to continuously transmit electromagnetic waves, and receive the return power after each transmission until the return power of the full frequency band of the surface acoustic wave sensor is obtained;

[0040] Specifically, the reader sends an electromagnetic wave, and when the transmission stops, after a certain period of time (such as about 4μs), the surface acoustic wave sensor returns power once; then the reader increases the transmission frequency according to the frequency sweep step and transmits again, and the sensor receives again. , until the frequency sweep of the entire frequency band of the entir...

Embodiment 2

[0049] Such as figure 2 As shown, the data measurement method based on the surface acoustic wave sensor includes:

[0050] Step S201: The device prepares for frequency scanning, and starts initialization first. After the initialization, the reader-writer controls the transmitting chip to perform frequency scanning within the frequency range of the surface acoustic wave sensor (hereinafter referred to as the SAW sensor). is 50kHz, and the emission time is 50μs.

[0051] After each emission of electromagnetic waves, the reader receives the signal returned from the SAW sensor (for example, the image 3 The transceiver switch in the switch is switched to the receiving state, and the receiving cycle can be set as 150μs), after detection, amplification, and AD acquisition, the return power value of each sweep point is obtained.

[0052] Step S202: Increase the emission frequency according to the first frequency sweep step of 50 kHz, continuously emit electromagnetic waves, and r...

Embodiment 3

[0071] Such as Figure 6 As shown, the data measurement device based on the surface acoustic wave sensor includes:

[0072] The preliminary frequency scanning module 10 is used to transmit electromagnetic waves to the surface acoustic wave sensor and receive the return power of the surface acoustic wave sensor;

[0073] The power acquisition module 20 is configured to increase the transmission frequency according to the preset first frequency sweep step to continuously transmit electromagnetic waves, and receive the return power after each transmission until the return power of the full frequency band of the surface acoustic wave sensor is obtained;

[0074] A closed-loop control module 30, configured to calculate a maximum first power and a second maximum second power among the return powers, and adopt closed-loop control between transmission frequencies corresponding to the first power and the second power The algorithm gradually reduces the frequency sweep step to transmit...

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Abstract

The present invention discloses a data measurement method and device based on a surface acoustic wave sensor, wherein the method comprises a step A of emitting an electromagnetic wave to the surface acoustic wave sensor, and receiving the return power of the surface acoustic wave sensor; a step B of increasing an emission frequency to emit the electromagnetic wave continuously according to a first sweep frequency step size, and receiving the return power after each emission until the return power of a full frequency band of the surface acoustic wave sensor is obtained; a step C of calculating the maximum value first power and the second largest second power in the return power of the sweep frequency points, and between the emission frequencies corresponding to the first power and the second power respectively, adopting a closed loop control algorithm to reduce the sweep frequency step size gradually to emit the electromagnetic wave, and receiving the return power; a step D of repeating the step C until the last sweep frequency step size reaches a preset second sweep frequency step size, and calculating the maximum value third power in the last return power.

Description

technical field [0001] The present invention relates to the field of sensing technology, in particular to a data measurement method and device based on a surface acoustic wave sensor. Background technique [0002] The surface acoustic wave theory began in 1885 in a paper by the British physicist Lord Rayleigh entitled "Wave Propagating Along the Smooth Surface of an Elastic Body". In addition to longitudinal and shear waves, another form of wave may exist, which is called surface acoustic wave (SAW). Soon, surface acoustic wave research was first carried out in the field of earthquakes, and a lot of achievements have been made in earthquake research and non-destructive testing. [0003] In 1965, White and Voltmer of the University of California invented an effective interdigital transducer (IDT) for exciting and detecting surface acoustic waves. For the first time, surface acoustic waves have officially entered the electronics arena. Soon, SAW delay lines, SAW convolution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/22
Inventor 刘殿君吕大伟李胜芳杨立新何凡
Owner STATE GRID CORP OF CHINA
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