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Pressure measurement sensitivity adjustment method

An adjustment method and technology of sensitivity, applied in the direction of fluid pressure measurement, measurement force, and measurement device by changing ohmic resistance, can solve problems such as changing and reducing strength, and achieve the effect of simple operation

Pending Publication Date: 2018-03-23
ZHEJIANG SCI-TECH UNIV
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  • Application Information

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Problems solved by technology

Therefore, although methods such as changing the number of filaments and changing the polymer matrix material can change its sensitivity, it also tends to reduce its strength, so it is not suitable to use

Method used

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0020] A typical example of the inventive method is: adopt the three-dimensional weaving method to manufacture the multi-layer composite fiber fabric that has binding yarn, as figure 1 As shown, the middle layer of the fabric uses Toray T700-12K carbon fiber as a sensitive fiber except for some warp and weft yarns, and the other fibers are Kevlar-29. The polymer matrix adopts vinyl resin RF1001, and the conductive filler adopts multi-walled carbon nanotubes (outer diameter 50 nanometers, length 10-20 microns).

[0021] In the fabric manufacturing stage, adjust the tension control spring of the yarn carrier so that the yarn tension of all warp and weft yarns is controlled at 80 centinewtons, and verify the actual tension of each yarn with a hand-held yarn tension tester.

[0022] In the polymer matrix preparation stage, the dosage of each material is: the mass...

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Abstract

The invention discloses a pressure measurement sensitivity adjustment method. The method is aimed at a novel distributed pressure sensing element with a fiber-reinforced composite material as a sensitive material to adjust the sensitive relationship between the resistance change and external pressure. The method comprises the steps that in the process of manufacturing a fiber-reinforced fabric through a fiber weaving machine, the degree of tightness between carbon fibers in the fabric is changed by adjusting the yarn tension of a yarn carrier; in the process of polymer matrix injection moldingmanufacturing, conductive particles such as carbon nanotubes or carbon black are uniformly dispersed in a polymer fluid in proportion; and the density of the conductive particles in the gap between the carbon fibers is changed by adjusting the filling amount thereof. Based on the adjustments, the method can effectively change the initial resistance value and pressure-resistance variation relationship between the carbon fibers, and changes the measurement sensitivity of a pressure sensing element. The method provided by the invention can effectively adjust the sensitivity of the pressure measurement without substantially changing the overall strength of the composite material.

Description

technical field [0001] The invention relates to a method for adjusting the sensitivity of a sensor, in particular to a method for adjusting the pressure measurement sensitivity of a fiber-reinforced composite material. Background technique [0002] In the field of force sensing, silicon-based piezoresistive materials and metal-based strain gauges have always been the mainstream of industrial applications, but their use in non-planar contact pressure distribution detection applications is limited by the hardness and brittleness of the materials themselves. The advantages of fiber-reinforced composite materials in the "integration of structure and function" make it begin to develop into the field of sensing and testing. The deformation of the carbon fiber reinforced composite material will lead to the change of the internal carbon fiber resistance, so there is no need to add other equipment, and the force of the composite material can be effectively judged only by measuring th...

Claims

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Application Information

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IPC IPC(8): G01L1/20G01L9/02
CPCG01L1/20G01L9/02
Inventor 程晓颖周洪水吴震宇胡旭东
Owner ZHEJIANG SCI-TECH UNIV
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