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Interface pressure distribution testing sensing element

A sensing element and pressure distribution technology, which is applied in the field of interface pressure distribution testing sensing elements, can solve the problem of inability to obtain field characteristics, unsuitable for rock soil/structure interface pressure distribution measurement, and inability to measure interface pressure distribution and changes and other problems, to achieve the effect of high force-sensitive precision, thin structure and high flexibility

Inactive Publication Date: 2012-04-11
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Long-term experimental research and engineering practice show that the pressure sensors currently used generally have the following two key problems: (1) A single sensor can generally only measure single-point information, and cannot obtain field characteristics; (2) Existing test sensors cannot measure Measuring interface pressure distribution and change
Therefore, the existing sensing technology is no longer suitable for measuring the pressure distribution of the rock-soil / structure interface

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1, as figure 1 image 3 As shown, the interface pressure distribution test sensing element is a square, which includes a sensing film 1, electrodes 2 evenly spaced around the sensing film 1, and wires 3 are connected to the electrodes 2. The upper and lower surfaces of the sensing film 1 and A layer of insulating and sealing insulating paint layer 4 is sprayed on the connection of the electrodes 2 respectively. The sensing film 1 is made of carbon black-filled rubber-based conductive composite material, with a thickness of 50 μm, a square sensing element with a side length of 200 mm, 32 electrodes with 8 evenly spaced on each side, and the electrodes are made of copper with a thickness of 0.1 mm. The size is 5mm×10mm, and each electrode 2 is connected with a wire. The electrode 2 and the sensing film 1 are bonded with conductive glue, and the wire 3 is welded with the electrode 2 .

Embodiment 2

[0017] Embodiment 2, as figure 2 image 3 As shown in the figure, the interface pressure distribution test sensing element is circular, which includes a sensing film 1, electrodes 2 evenly spaced around the sensing film 1, and wires 3 are connected to the electrodes 2. The upper and lower surfaces of the sensing film and A layer of insulating and sealing insulating paint layer 4 is respectively sprayed on the electrode connections. The sensing film 1 is made of a rubber-based conductive composite material filled with carbon nanotubes, with a thickness of 100 μm. The shape of the sensing film 1 is a circle with a diameter of 150 mm, and 16 electrodes are evenly spaced on the circumference. The electrodes are 0.1 mm Thick copper sheets, 5mm x 5mm in size, with wires attached to each electrode. The electrode and the sensing film are bonded with conductive glue, and the wire and the electrode are welded.

[0018] The shape of the sensing film 1 can be determined according to t...

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Abstract

The invention discloses an interface pressure distribution testing sensing element. The interface pressure distribution testing sensing element comprises a sensing film, electrodes uniformly arranged around the sensing film at intervals, a lead connected with the electrodes and an upper and lower insulating paint layer. The sensing film is made from a conductive polymer composite material provided with a piezo-resistive sensitivity characteristic, and the electrodes and the lead are used for outputting resistivity information of the sensing film in different positions. When in testing, the lead is connected with a testing instrument, the electrical impedance imaging technology is used for acquiring, testing and computing so as to obtain the resistivity distribution of the sensing film in different positions, and then the pressure distribution can be obtained through the relationship between the sensing film pressure and the resistivity. The interface pressure distribution testing sensing element can be used for measuring the interface pressure distribution and change, and has the advantages of simple structure, ultra-thin film, strong flexibility, high resolution and precision, large measuring range and low cost.

Description

technical field [0001] The invention relates to a test sensing element, in particular to an interface pressure distribution test sensing element. Background technique [0002] In the field of geotechnical mechanics and basic engineering research, it is necessary to measure the physical quantity of interface stress (pressure) in both on-site in-situ tests and indoor model tests. The in-situ test mainly includes the in-situ stress of the rock mass, the internal force of the underground engineering structure (such as shaft wall, roadway support, and tunnel lining), and the interface pressure between the support body and the surrounding rock; the model test test mainly includes the rock and soil mass pressure, Support body pressure, etc. The traditional interface pressure measurement mainly uses hydraulic pillow, steel string pressure cell, resistance strain pressure cell, etc. Most of the two types of sensors only have a single-point test function. [0003] Long-term experime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/18
Inventor 周国庆廖波赵光思赵晓东王建州王义江
Owner CHINA UNIV OF MINING & TECH
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