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Shape memory alloy strain sensor strain value detection method

A technology of strain sensor and memory alloy, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measuring device, etc., can solve the problems of inaccurate and lack of strain value measurement of shape memory alloy strain sensor

Inactive Publication Date: 2018-03-02
SHANGHAI JIAO TONG UNIV +2
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  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method for measuring the strain value of a shape memory alloy strain sensor, which is used to solve the lack of shape memory caused by environmental temperature changes and pre-strain differences in the prior art The strain value measurement of the alloy strain sensor is inaccurate to reduce the problem of measurement error

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  • Shape memory alloy strain sensor strain value detection method
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  • Shape memory alloy strain sensor strain value detection method

Examples

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Embodiment 1

[0065] A method for measuring the strain value of a shape memory alloy strain sensor, using nickel-titanium shape memory alloy wire as a test sensor and a reference sensor respectively, the diameter of the wire is 0.15mm, and the alloy composition is calculated by mass percentage: nickel: 56%; Titanium 44%. Its martensitic transformation initiation temperature M s =-10°C, it is a superelastic alloy wire at room temperature. Such as figure 1 As shown, the length of the component to be tested is 120cm, the width and height are both 15cm, and the two ends of the component are supported by two fulcrums. Hold, and apply a certain prestress to make the test sensor taut, and then solder the 4 wires (two current input lines, two voltage signal output lines) of the resistivity test system to the test sensor. At the same time, connect the four leads of the other test channel to another unstressed reference sensor of the same material.

[0066] Such as figure 2 As shown, at the ini...

Embodiment 2

[0068] A method for measuring the strain value of a shape-memory alloy strain sensor. A nickel-titanium shape-memory alloy film is fixed on an adhesive-backed plastic film with a thickness of 10 microns, a width of 3 mm, and a length of 30 mm by adhesive tape to make a basic Shape memory alloy sensor. The thickness of the film is 10 microns. The film is aged and annealed at 400°C for 3 hours, and the martensite transformation end temperature of the film is -40°C. The composition of the film is calculated by mass percentage: nickel: 56%; titanium 44%. During the test, take two pieces of nickel-titanium shape memory alloy films with the same specifications, one is pasted on the object to be tested as a test sensor; the other is in a free state as a reference sensor. Weld the 4 wires (two current input wires, two voltage signal output wires) of the resistivity testing system to the test sensor with soldering. At the same time, connect the four leads of the other test channel to an...

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Abstract

The invention provides a shape memory alloy strain sensor strain value detection method. The method comprises steps that 1), shape memory alloy is respectively taken as a test sensor and a reference sensor; 2), a value test system is employed to detect the non-deformed test sensor and the reference sensor, resistivity of the reference sensor and the non-deformed test sensor is respectively acquired, and resistivity difference is calculated; 3), the value test system is employed to detect the deformed test sensor and the reference sensor, resistivity of the reference sensor and the deformed test sensor is respectively acquired, and resistivity difference is calculated; and 4), according to resistivity change values, a strain value of the test sensor is calculated. The method is advantaged in that structure deformation and displacement can be monitored with high precision in real time, and the measurement error of the shape memory alloy strain sensor caused by different test environmentsor prestrain can be eliminated to a great degree.

Description

technical field [0001] The invention belongs to the field of strain sensors for measuring deformation or displacement, and relates to a method for measuring the strain value of a shape memory alloy strain sensor, in particular to using a shape memory alloy as a strain sensing material to prepare a shape memory alloy strain sensor and to measure the strain of the shape memory alloy. The strain value of the sensor is measured to reduce and eliminate the measurement error. Background technique [0002] Strain sensors are precision devices used to monitor the strain state of materials and structures, and are widely used in many fields, especially in the safety monitoring of civil structures such as buildings and bridges. At present, the more typical strain sensors are sensors based on resistivity changes. According to the linear relationship between resistivity and strain during the elastic deformation process of materials, the strain can be obtained by measuring the resistivity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 左舜贵施曙东金明江许严陈韬金学军
Owner SHANGHAI JIAO TONG UNIV
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