A kind of strain sensor with big sensing gauge length based on webcam

Chunzhe Li; Zhihao Yang; Jun Ma; Dong Sun; Xuefeng Zhao

doi:10.1117/12.2613227

18 April 2022 A kind of strain sensor with big sensing gauge length based on webcam

Chunzhe Li, Zhihao Yang, Jun Ma, Dong Sun, Xuefeng Zhao

Proceedings Volume 12046, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022; 120461B (2022) https://doi.org/10.1117/12.2613227
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Conference Poster

Abstract

Strain is an important parameter reflecting structural state, which is particularly important in the field of structural health monitoring (SHM). It can be used to evaluate the mechanical properties, failure behavior, crack development and residual stress of structural members and materials. It is particularly important in the field of structural health monitoring (SHM). In this paper, a new type of large gauge strain sensor is proposed. The proposed sensor is based on micro vision and uses a camera to capture small displacement. The packaging structure of strain sensor with sensing gauge length of about 50 cm is designed. In order to realize the monitoring in the field environment, the microscopic images in the experiment are obtained by webcam, which has broad application prospects. In the field of view of the camera, the maximum distance that the probe in the sensor can move is certain, but when the sensing gauge distance increases, the accuracy of strain measurement will be improved. The strain data obtained by the sensor is compared with the data obtained by FBG sensors to verify the measurement accuracy. It is found that the measurement accuracy is suitable for SHM of infrastructure.

Citation Download Citation

Chunzhe Li, Zhihao Yang, Jun Ma, Dong Sun, and Xuefeng Zhao "A kind of strain sensor with big sensing gauge length based on webcam", Proc. SPIE 12046, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022, 120461B (18 April 2022); https://doi.org/10.1117/12.2613227

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