Research on a Precision Calibration Model of a Flexible Strain Sensor Based on a Variable Section Cantilever Beam

Author:

Wang Qi12,Cui Jianjun2,Tang Yanhong3,Pang Liang3,Chen Kai2,Zhang Baowu4

Affiliation:

1. School of Information Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China

2. National Institute of Metrology, Beijing 100029, China

3. Metrology and Testing Institute of Tibet Autonomous Region, Lhasa 850000, China

4. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China

Abstract

The flexible strain sensor’s measuring range is usually over 5000 με, while the conventional variable section cantilever calibration model has a measuring range within 1000 με. In order to satisfy the calibration requirements of flexible strain sensors, a new measurement model was proposed to solve the inaccurate calculation problem of the theoretical strain value when the linear model of a variable section cantilever beam was applied to a large range. The nonlinear relationship between deflection and strain was established. The finite element analysis of a variable section cantilever beam with ANSYS shows that the linear model’s relative deviation is as high as 6% at 5000 με, while the relative deviation of the nonlinear model is only 0.2%. The relative expansion uncertainty of the flexible resistance strain sensor is 0.365% (k = 2). Simulation and experimental results show that this method solves the imprecision of the theoretical model effectively and realizes the accurate calibration of a large range of strain sensors. The research results enrich the measurement models and calibration models for flexible strain sensors and contribute to the development of strain metering.

Funder

Science and Technology Program of the Tibet Autonomous Region

Optical Fibre Sensing Characteristics of Low Pressure and High Radiation Environment Application Test Theory and Test Equipment

Differential Fabry-Perot Laser Interferometry Microdisplacement Metrology and Applications

Development of a New Measurement Device for External Thread Parameters Based on a Robotic Arm

National Key Research and Development Program of China

Fundamental Research Funds for the National Institute of Metrology Program of China

Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument

Publisher

MDPI AG

Subject

Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry

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