A multi-point series distributed optical fiber displacement sensor and its measurement system
A distributed optical fiber and displacement sensor technology, which is applied to measuring devices, instruments, and optical devices, can solve the problems of short coverage distance, high cost of multiple measuring points, and small number of measuring points, achieving reasonable cost and excellent engineering Structural adaptability, effect of no temperature compensation
Active Publication Date: 2021-06-15
HARBIN INST OF TECH
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[0006] The purpose of the present invention is to solve the problems of the existing civil engineering structure monitoring of the displacement sensing system, such as the small number of measuring points, short coverage distance, and high cost of multiple measuring points, and proposes a multi-point serial distributed optical fiber displacement sensor and its measurement system
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[0021] The technical solutions in the embodiments of the present invention will be described in conjunction with the drawings in which the accompanying drawings in the embodiments of the present invention will be apparent from the embodiments of the present invention, not all of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the present invention, there are all other embodiments obtained without making creative labor without making creative labor premises.
[0022] Combine Figure 1 - Figure 3 The present invention proposes a multipoint-based distributed optical fiber displacement sensor, including 1 distributed strain sensing fiber 1, adhesive 2, N change cross-section cantilever beam 3, 2 cantilever beam base 4, N The routine pad 5 and 2 fixed base 6; N is a positive integer greater than or equal to 1; the distributed strain sensing fiber 1 is adapted to the upper and lower surface of the changeable cantilever beam 3 via the adhesive 2, ...
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The present invention proposes a multi-point serial distributed optical fiber displacement sensor and its measurement system. The distributed sensing optical fiber is pasted on the upper and lower surfaces of a variable-section cantilever beam to form a displacement sensor. The surface senses the sensing relationship between the strain changes of the optical fiber, and realizes the measurement of the displacement of the end of the cantilever beam. The displacement measurement accuracy and range of the sensor can be adjusted, and a single displacement sensor can realize multi-directional displacement measurement. The displacement sensor introduced in the present invention can carry out multi-point series connection through an optical fiber, and use a high-spatial-resolution long-distance distributed optical fiber strain sensing system to measure the displacement changes of all series-connected measuring points, forming a long-distance synchronous displacement monitoring of super multi-measuring points system. The invention can meet the long-distance, super-many measuring points and high-precision displacement measurement requirements of large-scale civil engineering structures, and has reasonable cost, simple system structure and convenient implementation.
Description
Technical field [0001] The present invention belongs to the field of fiber sensing technology, and more particularly to a multipoint series-type distributed optical fiber displacement sensor and its measurement system. Background technique [0002] The displacement change of the civil engineering structure is an important characteristic of its structural state change. It has important significance for displacement information of civil engineering structures to analyze its structural mechanics, monitoring structural development, and evaluating structural security. However, civil engineering structure has the characteristics of large volume, long distance, complex construction, high key position, small displacement, etc., such as bridge, tunnel, railway, road, oil pipeline and other structures may be possible in designing service during design Generate structural diseases, and the displacement changes in the early stage of structural diseases are typically mm magnitude. Therefore, ...
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IPC IPC(8): G01B11/02
CPCG01B11/02
Inventor 董永康徐金龙巴德欣李惠
Owner HARBIN INST OF TECH