Fiber grating type sensor

Abstract

The invention relates to the fields of slope slip and roadbed settlement, and discloses a fiber grating type sensor. The sensor comprises the components of a fiber (3) which is provided with a fiber grating (4), a housing (1), and a transmission part which is arranged in the housing (1) and is used for transmitting deformation of the housing (1) to the fiber grating (4). One end of the fiber (3) penetrates through the housing (1). The fiber grating type sensor according to the invention can realize high-sensitivity monitoring on deep-part placement and furthermore realizes an advantage of compact structure.

Description

technical field [0001] The invention relates to the field of side slope slip and roadbed settlement monitoring, in particular to an optical fiber grating sensor. Background technique [0002] The foundation of buildings or the slopes and roadbeds of roads and railways will slowly settle over time, or deform during geological disasters, thus posing a threat to the buildings on the bottom. Therefore, the monitoring of slopes or subgrades is very important. At present, typical sensors for deep displacement monitoring include capacitive or eddy current displacement sensors. The displacement is measured by the electrical sensor and converted into an electrical signal input to the analysis equipment for calculation, and finally the deep slip is obtained. However, electronic sensors have problems such as poor sealing, easy leakage, easy corrosion, electromagnetic interference, and lightning strikes, and there are many problems in practical engineering applications. [0003] The o...

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Problems solved by technology

However, electronic sensors have problems such as poor sealing, easy leakage, easy corrosion, electromagnetic interference, and lightning strikes, and there are many problems in practical engineering applications.

[0003] The optical fiber sensor uses optical signals for sensing and transmission, and there is no problem with the above-mentioned electronic sensors. The existing optical fiber grating displacement sensor uses a spring installed under the disk, and the spring is connected to the optical fiber grating to sense the deep displacement. This design Displacement and strain of the soil must be transmitted to the FBG sensor by using a disc with a larger diameter, which limits the radial size of the sensor and increases the difficulty of installation. Longer, which reduces the spatial resolution of deep displacement monitoring and reduces the sensitivity of the sensor

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