An Inner Enclosed Cantilever Beam Fiber Grating Sensor
A fiber grating and cantilever beam technology, applied in the field of sensors, can solve the problems of inability to work stably for a long time, affect the performance of the sensor, and complex structure, and achieve the effects of simple structure, low cost, and resistance to seawater corrosion.
Inactive Publication Date: 2019-08-13
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0004] Direct exposure of fiber gratings to deep water and high pressure environments will affect the performance of the sensor and cannot work stably for a long time
In the patent with the publication number CN200420023342, although a pressure-resistant container and a bellows are used to protect the sensor and have certain flexibility, the structure of this method is complicated and the cost is high
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[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the invention.
[0031] see figure 1 , figure 2 The structure of the cantilever member (1) of the existing enclosed cantilever fiber grating sensor in the embodiment of the present invention is as follows. The inner sealing hole (17) is inside the cantilever beam member (1), parallel to the central axis of the cantilever beam (15), and has a certain distance from the neutral plane (16), which can avoid the strain of the fiber grating (4) under the action of external force case of z...
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The invention relates to an inner seal type cantilever beam fiber grating sensor, which belongs to the field of sensors. According to the inner seal type cantilever beam fiber grating sensor provided by the invention, inner seal holes are formed in a cantilever beam component provided with a fixed end and a stressed end and are used for placing fiber gratings used as sensitive elements; each inner seal hole is provided with two glue injection holes getting through to the inner seal hole from a cantilever beam; a fiber grating area is fixed between the two glue injection holes in each inner seal hole by using an optical fiber fixing adhesive through the glue injection holes. The encapsulated cantilever beam component, a force application rod and a force application rod installation piece are combined to form the sensor so as to be arranged on an object to be detected; when the object to be detected is acted by a force load, a fiber grating demodulator connected with the fiber gratings and a submarine cable monitors the magnitude of the force load through monitoring the change of fiber grating characteristic wavelengths. The inner seal type cantilever beam fiber grating sensor provided by the invention integrates the advantages of the fiber gratings and the cantilever beam structure, can be used for monitoring the force load of an engineering structure in deep water, and has the characteristics of seawater corrosion resistance, high water pressure resistance, simple structure and low cost at the same time.
Description
technical field [0001] The invention relates to an inner-sealed cantilever beam optical fiber grating sensor applicable to deep hydraulic load monitoring, which belongs to the field of sensors. Background technique [0002] As a new type of photonic device, the fiber grating has a good linear relationship between the change of the central wavelength of the characteristic light and the temperature change and strain. Because the fiber grating has no power supply on site, no electromagnetic interference, high measurement accuracy and resolution, fast response speed, large expansion capacity, it can be used in harsh environments such as high temperature, high humidity and chemical erosion for a long time, and line loss does not affect measurement and transmission. The advantage of long distance has been extensively applied research and achieved fruitful results. With the breakthrough of mass production technology, fiber gratings are becoming practical, and are widely used in op...
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IPC IPC(8): G01D5/353
CPCG01D5/3538
Inventor 杨德兴徐健姜亚军杜波波
Owner NORTHWESTERN POLYTECHNICAL UNIV