A device for detecting concrete autogenous shrinkage deformation by laser sensing measurement

By combining laser sensors and distributed fiber Bragg grating sensors, the problems of low accuracy and significant environmental impact in traditional detection methods are solved, realizing high-precision, non-contact detection of concrete self-shrinkage deformation, which is suitable for batch testing under multiple working conditions.

CN224480140UActive Publication Date: 2026-07-10GUANGZHOU NORTH SECOND RING TRANSPORT TECH CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGZHOU NORTH SECOND RING TRANSPORT TECH CO LTD
Filing Date
2025-07-23
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Traditional testing methods for detecting the autogenous shrinkage deformation of concrete suffer from problems such as contact measurement errors, significant influence from environmental fluctuations, low measurement accuracy, and poor data comparability.

Method used

By combining laser sensors and distributed fiber Bragg grating sensors, a non-contact method is used to measure the self-shrinkage deformation of concrete. Utilizing the monochromaticity and directionality of laser light, along with a modularly designed roller bracket and snap-fit ​​assembly, a dual feedback mechanism of overall displacement and local strain is constructed to improve measurement accuracy and system reliability.

Benefits of technology

It achieves high-precision, non-contact detection of concrete self-shrinkage deformation, eliminates the influence of environmental temperature and humidity changes, improves measurement resolution and detection efficiency, and is suitable for batch testing under multiple working conditions.

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Abstract

This utility model discloses a laser-sensor-based concrete self-shrinkage deformation detection device, belonging to the field of building material performance testing technology. The device includes a base plate. Through the arrangement of the detection components and corrugated pipe, the corrugated pipe linearly converts the concrete shrinkage strain into axial displacement during use, while guide rollers constrain radial displacement. The laser optical path and the fiber optic sensor sensing path are physically isolated, allowing the two systems to operate independently. Furthermore, a laser displacement sensor replaces the infrared sensor, utilizing the strong monochromaticity and good directionality of laser light, along with a laser reflector, to eliminate the influence of environmental temperature and humidity changes on the optical path and improve resolution. Distributed fiber optic sensors are pre-embedded within the corrugated pipe wall, fusing with laser displacement data to construct a "global displacement-local strain" dual feedback mechanism. This multi-sensor collaborative design significantly improves system reliability.
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