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Piezoresistive strain gauge using doped polymeric fluid

A strain gauge and piezoresistive technology, applied in the field of strain gauge and its manufacturing, can solve problems such as environmental damage

Active Publication Date: 2009-01-07
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While this strain gage is effective, it is environmentally damaging due to its mercury content, causing disposal problems

Method used

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  • Piezoresistive strain gauge using doped polymeric fluid
  • Piezoresistive strain gauge using doped polymeric fluid
  • Piezoresistive strain gauge using doped polymeric fluid

Examples

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Embodiment

[0037] The strain gauge of this example is made by encapsulating conductive silicone oil and metal electrodes with two layers of polydimethylsiloxane (PDMS) films. PDMS (Dow Corning Sylgard 184) was prepared by mixing curing agent and elastomeric substrate at a mixing ratio of 1:10. First, coat a thin layer of the PDMS mixture on a silicon wafer and then degas it in a vacuum chamber for 15 min. It was then cured in an oven at 70°C for 1 hour. The thickness of PDMS was measured to be about 500 μm. By mixing 10~30wt% CDX-7055 into silicone oil (Columbian Chemicals, Co. produced) carbon black powder or carbon nanotubes to obtain conductive silicone oil. First connect a pair of metal wires to one side of the silicon wafer to make the electrodes that make contact with the strain gauge material. Conductive silicone oil was applied by screen printing or embossing on the PDMS membrane with designed openings on the preformed PDMS membrane. Pour a layer of PDMS mixture over conduc...

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Abstract

The present invention relates to a strain gauge and methods of making such wherein the gauge contains a doped polymeric fluid suitable for measuring elongations of more than 10%.

Description

technical field [0001] The present invention relates to strain gauges containing a doped polymeric fluid suitable for measuring elongation in excess of 10%, and methods of making the same. Background technique [0002] Strain gauges or gages are used to measure the dimensional changes that occur primarily at the surface of a sample when mechanical and / or thermal forces are applied to the sample. A strain gauge is attached to the sample surface and mechanically amplifies the surface deformation of the surface so that the change can be measured by the indicator. [0003] In the measurement of biological fluid flow, Whitney (1953) first introduced mercury-in-rubber strain gauge plethysmography for measuring changes in tissue volume that occur in response to venous occlusion. In use, strain gauges in tension are placed around the limb to be studied. While this strain gage is effective, it is environmentally damaging due to its mercury content, causing disposal problems. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCH01C10/106G01B7/18Y10T29/49103
Inventor 郑庆祥钞晨张燕妮
Owner THE HONG KONG POLYTECHNIC UNIV
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