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Surface deformation distribution test sensing element

A technology for distributed testing and sensing elements, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc. Problems such as the stiffness of the medium to be measured does not match

Inactive Publication Date: 2012-01-04
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Long-term experimental research and engineering practice have shown that the deformation sensors currently used generally have the following two key problems: (1) The principles of the sensitive elements of various deformation sensors are different, and the stiffness of the sensor and the medium to be measured does not match; a single sensor can generally only measure Single-point information cannot obtain field characteristics, that is, most information is "inaccurate"; (2) Existing test sensors cannot measure nonlinear deformation and distribution of rock-soil media, cracks and failure (shear) zone gestation and evolution Parameters that are becoming more and more important for modern basic scientific research, that is, a lot of information is "undetectable"
Therefore, the existing sensing technology is not suitable for the surface deformation of rock and soil media, especially the measurement of nonlinear large deformation distribution

Method used

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Examples

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Embodiment 1

[0015] Embodiment 1, as figure 1 image 3 As shown, the surface deformation distribution test sensing element includes a flexible sensing film 1, electrodes 2 evenly spaced around the flexible sensing film 1, wires 3 connected to the electrodes, and flexible insulating layers attached to the upper and lower surfaces of the flexible sensing film 4. The flexible sensing film 1 is made of a carbon black-filled rubber-based conductive composite material with a thickness of 40 μm. The shape of the flexible sensing film 1 is a square with a side length of 250 mm. The 32 electrodes are arranged at equal intervals of 8 on each side. The electrode 2 is made of a 0.05mm thick copper sheet with a size of 5mm×10mm, and the electrodes 2 are connected with wires 3 . The copper electrode 2 and the flexible sensing film 1 are bonded with conductive adhesive, and the wire 3 is welded to the electrode 2 . A layer of flexible insulating layer 4 poured with liquid silicone rubber is respective...

Embodiment 2

[0016] Embodiment 2, as figure 2 image 3 As shown, the surface deformation distribution test sensing element includes a flexible sensing film 1, electrodes 2 evenly spaced around the flexible sensing film 1, wires 3 connected to the electrodes, and flexible insulating layers attached to the upper and lower surfaces of the flexible sensing film 4. The flexible sensing film is made of a rubber-based conductive composite material filled with carbon nanotubes and carbon black. Each electrode is made of 0.05mm thick copper sheet with a size of 5mm×5mm, and each electrode is connected with a wire. The copper electrode 2 and the flexible sensing film 1 are bonded with conductive adhesive, and the wire 3 is welded to the electrode 2 . A layer of flexible insulating layer 4 poured with liquid silicone rubber is respectively attached to the upper and lower surfaces of the flexible sensing film 1 and the joints of the electrodes 2. The liquid silicone rubber is used to cast the flex...

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Abstract

The invention discloses a surface deformation distribution test sensing element which comprises a flexible sensing thin film, electrodes arranged at the periphery of the flexible sensing thin film uniformly at intervals, lead wires which are connected with the electrodes, an upper flexible insulation layer and a lower flexible insulation layer. Composite materials with strain sensitivity characteristics are utilized to prepare the flexible sensing thin film; and the electrodes and the lead wires are used for outputting specific resistivity information at different positions of the flexible sensing thin film. When in test, the lead wires and a testing instrument are connected; collection test and calculation are carried out by utilizing the electrical impedance imaging technology, the specific resistivity distribution at different positions of the flexible sensing thin film is obtained, and the strain size distribution is obtained through the specific relationship between the strain size of the sensing thin film and the size of the specific resistivity again. The test of two-dimensional deformation field quantity can be realized by the sensing element disclosed by the invention, and the sensing element has the characteristics of simple and ultrathin structure, flexibility, high resolution ratio and precision, great strain range and low cost.

Description

technical field [0001] The invention relates to the technical field of deformation testing and sensing, in particular to a surface deformation distribution testing sensing element suitable for testing rock soil media and surface deformation of structures. Background technique [0002] In the field of rock and soil mechanics and engineering basic research, the measurement of deformation physical quantities is required in both model tests and sample tests. Model test mainly includes crack development and failure evolution; sample test mainly includes sample volume change, strain localization, formation of failure surface (band) and progressive failure process, etc. Traditional deformation measurement methods mainly use resistance strain gauges, strain extension sensors, differential resistance strain gauges, inductive strain sensors, string strain sensors, concrete strain gauges and optical fiber sensors based on the assumption of elasticity, uniformity, continuous and small d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
Inventor 廖波周国庆赵光思陈国舟王承来商翔宇
Owner CHINA UNIV OF MINING & TECH
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