Full distributed fiber displacement sensor based on fiber grating positioning
A technology of displacement sensor and optical fiber grating, applied in the direction of instruments, optical devices, measuring devices, etc., can solve the problems of difficult application, small range, large displacement measurement error, etc., and achieve the effect of high displacement sensitivity
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Embodiment 1
[0033] In Example 1, 1# displacement sensor is connected in series with 3 fiber gratings with different wavelengths, all of which are Bragg gratings, and their performance parameters are shown in Table 1. In the displacement loading experiment, due to the limitation of the laboratory space, the load length of the structure cannot be designed too large, but this factor is not affected in the actual project. In order to improve the displacement range and sensitivity coefficient of the displacement sensor, a multi-section bearing Carrier fiber. Among them, the 1# displacement sensor is equipped with 4 sections of 3.96m loaded optical fiber sections (all of which are tensioned optical fiber sections), and the displacement is applied through the displacement slide table. , 7575.8με), to ensure that the loading strain is less than the ultimate strain.
Embodiment 2
[0035] In order to increase the displacement and reduce the applied strain amplitude, the 2# displacement sensor in Example 2 is connected in series with two fiber gratings with different wavelengths, both of which are Bragg gratings, and their performance parameters are shown in Table 1. In the displacement loading experiment, the 2# displacement sensor is equipped with 5 sections of 5.0m loaded optical fiber sections (all of which are tensioned optical fiber sections), and the displacement is applied through the displacement slide table. The loading displacement is 0.5cm, 1cm, 1.5cm, 2cm, 2.5 cm (corresponding strains are 1000με, 2000με, 3000με, 4000με, 5000με), to ensure that the optical fiber does not debond during the tension process. During the experiment, the position of one end of the fixed fiber remains unchanged, and the other end is displaced by a displacement slide to achieve the purpose of changing the distance between the fiber gratings and realize the structural ...
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