A new surface-mounted adjustable range fiber grating displacement meter
A fiber grating and surface mount technology, applied in the field of new surface mount adjustable range fiber grating displacement meter, can solve the problems of unsatisfactory measurement effect, loss of detection data, low reliability and performance, and achieve easy networking and packaging. Simple, waterproof effect
Inactive Publication Date: 2015-07-29
SHANDONG UNIV
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Problems solved by technology
[0003] The fiber grating-based surface-mounted displacement sensor integrates the advantages of fiber grating sensors and overcomes the shortcomings of traditional electrical sensors. However, in the monitoring process where the range and accuracy cannot be estimated, it is easy to exceed the range or lack of accuracy. Even severe measurement accidents such as damage to the sensor and loss of detection data due to excessive displacement have occurred. Its reliability is low, and the measurement effect is not satisfactory for special occasions.
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[0028] According to the actual situation on site, select a specific range, fix the fixed end of the measuring outer arm 5 to the adjusting arm 4, and fix the outer measuring end of the measuring outer arm 5 to a small displacement such as a crack. When the crack cracks or shrinks, the displacement changes drive the measuring outer arm 5 to expand or contract inward, thereby driving the dovetail slider 6 of the dish-shaped bracket 3 to perform linear reciprocating motion in the defined dovetail groove 7, resulting in the fixed fiber grating 8 The grating fixing mechanism 2 moves back and forth relative to the middle gap, and then pulls and compresses the fiber grating 8, causing the center wavelength to change. Use the wavelength demodulator to monitor the center wavelength of the fiber grating, collect the corresponding data information, and eliminate the temperature change factor, so that the wavelength change value corresponding to the displacement increment or decrement can ...
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The invention particularly discloses a novel surface-mounted FBG (fiber bragg grating) displacement meter with an adjustable measurement range. The novel surface-mounted FBG displacement meter comprises a shell, a butterfly-shaped support, an outer measuring arm, an adjusting arm, a grating fixing mechanism and an FBG sensor. The butterfly-shaped support, the outer measuring arm, the adjusting arm and the grating fixing mechanism are arranged on the surface of the shell; the outer measuring arm is connected with one end of the butterfly-shaped support through the adjusting arm; the grating fixing mechanism is connected with the other end of the butterfly-shaped support; one end of the FBG sensor is fixed on the grating fixing mechanism, while the other end of the FBG sensor is connected with an optical fiber demodulator; and the butterfly-shaped support is of an asymmetric structure. The surface-mounted FBG displacement meter is designed on the basis of the FBG e sensing principle, is made from a stainless steel material and has the advantages of high strength, excellent durability and simple encapsulation; the sensor fixation manner is flexible, the measurement range and the measurement precision can be adjusted according to actual conditions on site and therefore the application range is wide; all sensors are selected from optical elements and the water-proof effect is good; and the displacement meter can be easily networked, so that on-line measurement can be realized in real time.
Description
technical field [0001] The invention specifically relates to a novel surface-mounted optical fiber grating displacement meter with adjustable range, especially a surface-mounted optical fiber grating displacement meter that can adjust the range and precision according to actual measurement conditions. Background technique [0002] At present, in large-scale civil engineering and model tests, it is often necessary to monitor the displacements of different ranges such as cracks and cracks in real time. Conventional electrical sensors have a limited service life, are susceptible to electromagnetic signal interference, are large in size, and have poor waterproof performance, which cannot meet the requirements of real-time monitoring. Fiber gratings are small in size, light in weight, anti-electromagnetic interference, waterproof and moisture-proof, and easy to use and maintain. Sensors based on fiber gratings have a wide range of bandwidth, small additional loss, strong anti-int...
Claims
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IPC IPC(8): G01B11/02
Inventor 王宁王静隋青美王正方蒋善超路士增杨帅贾磊曹玉强
Owner SHANDONG UNIV