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Strain sensor and application thereof

A technology of strain sensor and thin film resistor, which is applied in the field of sensors, can solve problems such as the measurement hysteresis of the adhesive sensor, the easy failure of the adhesive, and the impact on the concrete structure, so as to improve the service life and detection accuracy, and avoid the hysteresis of the test and the impact on the concrete structure. Effects of creep resistance, improvement of integration degree and service life

Pending Publication Date: 2022-03-01
北京石墨烯技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of the protective shell not only makes the volume of the sensor increase, the structure is complicated, the installation is cumbersome, and the overall stability is not high, but also affects the concrete structure around the sensor.
In addition, after adding the protective shell, the sensor cannot be in direct contact with the concrete, so that the strain between the pavement layers can only be transmitted to the protective shell through the asphalt concrete, and then transmitted to the detection element
This process will cause the attenuation loss of strain, which will affect the measurement accuracy of the sensor
[0003] In addition, the strain gauges in traditional strain sensors are usually glued to the detection element, and the adhesive is prone to failure during use, resulting in the failure of the strain gauges to work properly
Moreover, the temperature is high when the pavement is laid, and the adhesive is prone to stickiness at high temperature, which causes the hysteresis of the sensor measurement.

Method used

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  • Strain sensor and application thereof
  • Strain sensor and application thereof
  • Strain sensor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] in such as Figure 1~4 In the specific example shown, the strain sensor provided by the present invention includes an elastic member 100 , a detection module 200 and a fixing member 300 for fixing the elastic member 100 . Such as image 3 and 4 As shown, the elastic member 100 is a cylindrical elastic rod made of two longitudinally cut semi-cylindrical nylon elastic struts bonded by epoxy resin adhesive at 170°C and 30 MPa, and the elastic member 100 can adapt to the interlayer strain of the asphalt pavement. And deformation. A first groove 111 and a second groove 121 communicating with the first groove 111 are provided on the semi-cylindrical surface of one of the elastic struts, so that the two elastic struts cooperate to form the installation cavity 110 and the wire passing hole 120 . One end of the second groove 121 is connected to the center of one side of the first groove 111 , and the other end of the second groove 121 extends to the end of the elastic member ...

Embodiment 2

[0078] The structure of the strain sensor in this embodiment is substantially the same as that in Embodiment 1, except that the positions and structures of the first thin-film resistor 211 , the second thin-film resistor 212 , the third thin-film resistor 213 and the fourth thin-film resistor 214 are different. The specific structure is as follows:

[0079] refer to figure 2 , 3 , 5 and 6, it can be seen that the elastic member 100 is a cylindrical elastic rod made of two longitudinally cut semi-cylindrical nylon elastic struts bonded by epoxy resin adhesive at 170°C and 30MPa, and the elastic member 100 can be used along with the asphalt pavement Deformation due to interlayer strain. Wherein, the corresponding positions on the semi-cylindrical surfaces of the two elastic struts are provided with a first groove 111 and a second groove 121 communicating with the first groove 111, so that the two elastic struts cooperate to form a mounting cavity 110 and wire hole 120. One ...

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Abstract

The invention relates to the technical field of sensors, in particular to a strain sensor and application thereof. The strain sensor comprises an elastic piece provided with a mounting cavity and a wire passing hole, the wire passing hole is communicated with the mounting cavity, and the elastic piece can deform along with strain; the detection module comprises a Wheatstone half-bridge circuit unit, the Wheatstone half-bridge circuit unit is arranged in the mounting cavity, the Wheatstone half-bridge circuit unit comprises a first thin-film resistor, a second thin-film resistor, a third thin-film resistor and a fourth thin-film resistor, and the length directions of the first thin-film resistor and the second thin-film resistor are the same; the third thin-film resistor and the fourth thin-film resistor are perpendicular to the first thin-film resistor and the second thin-film resistor; leads of the first thin-film resistor, the second thin-film resistor, the third thin-film resistor and the fourth thin-film resistor are exposed out of the elastic piece through the wire passing holes; and the fixing piece is connected with the elastic piece and is used for fixing the elastic piece. The sensor is high in measurement precision.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a strain sensor and its application. Background technique [0002] The interlayer strain of asphalt pavement affects the service life of the road and the safe running performance of the pavement. Installing sensors on elastic rods and building them between pavement layers is an effective means of strain monitoring between pavement layers. However, due to the complex and harsh conditions during road construction, in order to protect the sensor elements integrated on the elastic rods, it is usually necessary to add Protective case. However, the introduction of the protective shell not only increases the volume of the sensor, complicates the structure, cumbersome installation, and the overall stability is not high, but also affects the concrete structure around the sensor. In addition, after adding the protective shell, the sensor cannot directly contact with the concrete, so that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 李学瑞李炯利王刚罗圭纳于公奇王旭东
Owner 北京石墨烯技术研究院有限公司
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