Composite fiber detection module and device

Abstract

The invention discloses a composite fiber detection module comprising a substrate having a stress bearing surface, wherein a fiber structure I, a fiber structure II and a fiber structure III which are parallel up and down are arranged on the stress bearing surface; the fiber structure I is of a tubular structure and used for great measuring range measurement of shear force; the fiber structure II is of a single fiber structure and used for initial high-accuracy survey of the shear force; and the fiber structure III is of an embedded type structure and used for direction judgment. Through arranging three different fiber structures on the stress bearing surface of the same substrate, the composite fiber detection module can realize the great measuring range and initiall high-accuracy survey measurement and the direction judgment and obtain accurate and comprehensive information. During actual use, a plurality of composite fiber detection modules can be mutually connected to form a three-dimensional structure or extend along the same direction plane, thereby greatly improving the flexibility of the application of the module. In addition, the invention also discloses a composite fiber detection device.

Description

technical field [0001] The invention relates to the technical field of using an optical fiber device to realize synchronous measurement of deformation and motion direction, in particular to a composite optical fiber detection module and a composite optical fiber detection device. Background technique [0002] my country is one of the countries with the most serious geological disasters in the world. Every year, hundreds of millions of losses are caused by landslides and other slope instability disasters, which seriously affect the safety of people's lives and property. Therefore, it is necessary to establish an effective monitoring network and timely forecast And protection has become an important way to resist disasters and reduce losses. [0003] Optical fiber sensing technology is to realize the measurement of environmental parameters by measuring the changes of certain parameters (such as intensity, phase, frequency, polarization state, etc.) , the optical fiber sensor us...

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Problems solved by technology

[0004] At present, coaxial cable-based time domain reflectometry (TDR) monitoring technology, optical time domain reflectometry and Brillouin optical time domain reflectometry (BOTDR) are domestic research hotspots, but these technologies are used in slope stability monitoring. Each has its own defects. Among them, TDR has poor sensitivity when there is no shear force, so it is difficult to act on the measurement occasions with high initial accuracy and large stroke. OTDR has high initial accuracy in application, but it is difficult to achieve large range and Azimuth determination; BOTDR has the advantages of small optical signal loss, long distance measurement, and a single optical fiber is cheap, and can easily determine the position of deformation, but its measurement distance is small, and it still needs to be improved in the realization of azimuth determination. Research

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