Contact stress sensor

A technology of contact stress and sensors, applied in the field of sensors, can solve the problems of poor temperature characteristics of devices, complicated process, and small thickness of foil strain gauges, etc., and achieve obvious changes in resistance value and length, and are easy to popularize and use.

Inactive Publication Date: 2013-11-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The two curved surfaces of the curved slit structure are generally supported by an elastic medium. Real-time measurement of the contact stress on the upper and lower contact surfaces of the elastic medium is of special value: on the one hand, the monitoring results can be used as a reference for external standard operations, and on the other hand, it can be used as a reference for extreme environments. However, due to space constraints, the measurement of contact stress is still a difficult point in measurement technology. The common foil strain gauge has a small thickness and an approximate planar structure, which can be placed in a small enough slit Among them, but the structural design and principle of this kind of strain gauge determine that it can only be used to test the tensile force, and cannot be directly used for the test of the contact stress. Although the general contact stress sensor can be installed in the slit, because of Based on the piezoresistive effect, the problems of poor temperature characteristics of the device and complex process have not been well resolved

Method used

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Embodiment 1

[0025] Such as figure 1 , figure 2 As shown, the contact stress sensor in this embodiment includes a flexible support base 1 with four circular through holes 11, a strain gauge 2, a flexible transmission line 3 and a flexible medium 4, wherein the flexible support base 1 is located at the bottom, and the strain The meter 2 and the flexible transmission line 3 are connected as a whole by wire bonding and then bonded to the upper surface of the flexible support base 1 by AB glue. Four circular through-holes 11 are also the main structure that enables the contact stress sensor in this embodiment to be used for contact stress monitoring. Due to the existence of these holes, under the action of force, the strain gauge 2 on the flexible support base 1 Simultaneous bending and deformation of multiple parts corresponding to the position of the through hole 11 makes the length change of the sensitive grid in the strain gauge 2 more obvious in a smaller thickness range, that is, the c...

Embodiment 2

[0030] The structure and working principle of the contact stress sensor in this embodiment are the same as that of the contact stress sensor in Embodiment 1, the difference is that four square through holes 11 are arranged on the flexible support base plate in this embodiment; The material of the flexible support substrate 1 of the contact stress sensor is polyimide with an elastic modulus of 2.25 GPa, and the material of the flexible medium 4 is rubber with an elastic modulus of 25 MPa.

Embodiment 3

[0032] The structure and working principle of the contact stress sensor in this embodiment are the same as that of the contact stress sensor in Embodiment 1, the difference is that four rectangular through holes 11 are arranged on the flexible support base plate in this embodiment; The material of the flexible support substrate 1 of the contact stress sensor is polyimide with an elastic modulus of 4GPa, and the material of the flexible medium 4 is rubber with an elastic modulus of 50MPa.

[0033] The number of through holes on the flexible support base in the above embodiments is not limited to four.

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Abstract

The invention discloses a contact stress sensor. The contact stress sensor comprises a flexible supporting base, a strainmeter, a flexible transmission line and a flexible medium, wherein the flexible supporting base is provided with a plurality of through holes and located at the bottommost position, the strainmeter and the flexible transmission line adhere to the upper surface of the flexible supporting base after being connected into a whole in a lead bonding mode, and the flexible medium covers and adheres to the upper surface of a combination of the strainmeter and the flexible transmission line. Due to the adoption of the flexible supporting base, the flexible transmission line and the flexible medium, the contact stress sensor is capable of bending and deforming along with changes of installation environments, and particularly applicable to measuring contact stress of an upper contact surface and a lower contact surface of an article located in a curved surface structure; due to the fact that the through holes are formed in the supporting base, the contact stress sensor can be used for measuring not only pulling stress but also compressive stress, and measuring accuracy is enhanced.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a contact stress sensor. Background technique [0002] The two curved surfaces of the curved slit structure are generally supported by an elastic medium. Real-time measurement of the contact stress on the upper and lower contact surfaces of the elastic medium is of special value: on the one hand, the monitoring results can be used as a reference for external standard operations, and on the other hand, it can be used as a reference for extreme environments. However, due to space constraints, the measurement of contact stress is still a difficult point in measurement technology. The common foil strain gauge has a small thickness and an approximate planar structure, which can be placed in a small enough slit Among them, but the structural design and principle of this kind of strain gauge determine that it can only be used to test the tensile force, and cannot be directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22
Inventor 丁杰雄边志远褚博文赵旭东刘广民何建国邓梦付振华李海宁姜忠关利超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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