Differential resonator type wireless and passive surface acoustic wave strain sensor

A surface acoustic wave, wireless passive technology, applied in the direction of using ultrasonic/sonic/infrasonic waves, instruments, measuring devices, etc., can solve problems such as strain detection interference

Active Publication Date: 2017-10-24
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

In order to solve the problem of interference to strain detection caused by ambient temperature, the present inven

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  • Differential resonator type wireless and passive surface acoustic wave strain sensor
  • Differential resonator type wireless and passive surface acoustic wave strain sensor
  • Differential resonator type wireless and passive surface acoustic wave strain sensor

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Embodiment Construction

[0027] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0028] Such as figure 1 As shown, the wireless passive surface acoustic wave strain sensor provided by the embodiment of the present invention includes: an antenna 1 , a matching circuit 2 , and a SAW sensor device 5 . Wherein, the matching circuit 2 is provided with an antenna 1 , and the SAW sensor device 5 and the matching circuit 2 are connected by a signal lead 6 . The antenna 1 described in this embodiment adopts a microstrip antenna. Matching circuit 2 is a network with a 30nh matching inductor connected in parallel, and the input impedance is set to 50 ohms. The SAW sensor device 5 is packaged by a package base 3 and a flexible package substrate 4 , and includes a reference device 8 and a sensing device 9 . Wherein, the package base 3 is made of ceramic material, and the flexible package base 4 is made of al...

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Abstract

The invention relates to a differential resonator type wireless and passive surface acoustic wave strain sensor, which comprises an antenna, a matching circuit, a packaging tube socket, a flexible packaging bottom sheet and a SAW sensing device, wherein the antenna is arranged on the matching circuit, the matching circuit is connected with the SAW sensing device via a signal lead wire, the SAW sensing device is packaged by means of the packaging tube socket and the flexible packaging bottom sheet, the SAW sensing device comprises a reference device and a perceiving device, the reference device is used for temperature compensation, and the perceiving device is used for strain detection. The principle of the sensor is that strain action is directly sensed by using the strain sensing device, resulting in variation of the corresponding resonance frequency, and the sensing of strain of an object to be measured can be realized through decoupling sensing information. By adopting the reference device and the perceiving device of two one-terminal-pair resonance type SAW devices, the differential resonator type wireless and passive surface acoustic wave strain sensor solves the problem of interference of environment temperature on strain measurement in a differential manner.

Description

technical field [0001] The invention relates to a surface acoustic wave sensor in acoustic technology, in particular to a wireless passive surface acoustic wave sensor applied to measuring strain. Background technique [0002] As a key component of industrial process control, strain sensors are widely used in aerospace, petroleum and petrochemical, electric power, motor vehicles, and railways. For example, a real-time monitoring application of the health of a helicopter wing operation. [0003] Traditional strain sensors are generally based on the resistive strain effect. The principle is that when a metal conductor or semiconductor is subjected to an external force, the corresponding strain will cause its resistance value to change accordingly. This type of strain sensor is widely used, but there are some problems that need to be solved urgently: resistive strain sensor has low resistance sensitivity, so it is necessary to use a bridge to amplify the signal, resulting in ...

Claims

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Application Information

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IPC IPC(8): G01B17/04
Inventor 王文王毅坚薛蓄峰梁勇
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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