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Wireless passive surface acoustic wave delay line type temperature and pressure sensor

A technology of pressure sensor and surface acoustic wave, applied in the field of wireless passive surface acoustic wave mixed parameter measurement sensor, can solve the problems of poor anti-environmental noise and electromagnetic interference, achieve better time domain response, eliminate edge reflection, reduce Effects of Temporal Noise

Active Publication Date: 2014-02-05
MESNAC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention proposes a wireless passive surface acoustic wave delay line temperature and pressure sensor to solve the problem of poor anti-environmental noise and electromagnetic interference of existing surface acoustic wave delay line sensors. The technical solution is as follows:

Method used

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  • Wireless passive surface acoustic wave delay line type temperature and pressure sensor
  • Wireless passive surface acoustic wave delay line type temperature and pressure sensor
  • Wireless passive surface acoustic wave delay line type temperature and pressure sensor

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Embodiment 1

[0026] Embodiment one, refer to figure 2 and image 3 ,in figure 2 It is the top view of the wireless passive surface acoustic wave delay line temperature and pressure sensor of this embodiment, image 3 It is a side view of the wireless passive surface acoustic wave delay line temperature and pressure sensor of this embodiment.

[0027] As shown in the above figures, the wireless passive surface acoustic wave delay line temperature and pressure sensor in this embodiment includes: an interdigital transducer 1 for transmitting the same energy in two directions, an interdigital transducer 1 for detecting interdigital transducer The energy reflector 2 emitted by the energy device and the piezoelectric substrate 4 for conducting the energy emitted by the interdigital transducer to each reflector, the interdigital transducer 1 divides the piezoelectric substrate 4 into two parts, one part It is bonded with the base by glue 6, and the other end is suspended. When in use, the s...

Embodiment 2

[0031] Embodiment two, refer to Figure 4 , the difference from Implementation 1 is that in this embodiment, the number of reflectors for detecting temperature information is 4, and the number of reflectors for detecting pressure and temperature information is 3. Of course, the The number of reflectors on the left and right sides of the reflector is not limited to the above example, and the specific setting can be comprehensively considered in terms of anti-interference strength and cost.

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Abstract

The invention provides a wireless passive surface acoustic wave delay line type temperature and pressure sensor. Three to five reflectors containing temperature information are arranged on the left side of an interdigital transducer, two to four reflectors containing pressure and temperature information are arranged on the right side of the interdigital transducer, and therefore normal temperature output of a temperature point cannot be affected when any of the three left-side reflectors containing the temperature information works abnormally or generated pulses are interfered by environmental noise and electromagnetism. In a similar way, when any of the two right-side reflectors responding temperature and pressure change works abnormally or generated pulses are interfered by environmental noise and electromagnetism, normal pressure output of a pressure point cannot be affected through temperature phase compensation.

Description

technical field [0001] The invention belongs to the technical field of surface acoustic wave sensing, and in particular relates to a wireless passive surface acoustic wave mixed parameter measurement sensor capable of simultaneously detecting changes in two external physical quantities to be measured. Background technique [0002] Because surface acoustic wave passive wireless sensors have the advantages of non-contact, fast, no power supply, anti-interference, easy coding, good confidentiality, and low cost, they have been widely used in many fields. The sensor array composed of it can be connected without signal wires between the sensing elements, and the array output does not need to be connected with wires, so the distribution is easier and the application is not limited. , sensing and target recognition. [0003] In the past, SAW sensors can only detect a single physical quantity or even if they can measure two physical quantities, the structure is relatively complex. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/22G01L1/25
Inventor 袁仲雪韦江波滕学志陈海军董兰飞任丽艳李玉峰
Owner MESNAC