Fiber bragg grating osmotic pressure sensor based on double-S-beam structure and testing system

By adopting dual S-beam structure and low-temperature glass welding technology in the FBG osmotic pressure sensor, the problem that the sensor is difficult to achieve long-term stability and high-precision monitoring in actual engineering is solved, and the osmotic pressure test effect with higher accuracy and stability is achieved.

CN119714630APending Publication Date: 2025-03-28INST OF DISASTER PREVENTION
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Patent Information

Application Number
CN202411913804.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing FBG osmotic pressure sensors have shortcomings in structural design and calibration testing, and it is difficult to achieve long-term stable and high-precision osmotic pressure monitoring in actual engineering.

Method used

The double S beam structure with left and right symmetrical double S beam structure is used as the substrate of the sensor. The stress is concentrated in the double S beam area through the design of the double S beam substrate, and low-temperature glass welding is used to replace traditional adhesives to ensure the stiffness and stability of the sensor.

Benefits of technology

A higher precision osmotic test was achieved, with a sensor sensitivity of about 1.87 pm/kPa and a linearity of more than 99%, showing good stability and real-time performance in indoor slope model tests.

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Abstract

The invention belongs to the technical field of FBG sensors. According to the fiber bragg grating osmotic pressure sensor based on the double-S-beam structure and the testing system, a double-S-beam substrate is arranged in a bilateral symmetry mode and comprises a substrate body and a double-S beam located in the middle, the double-S beam comprises a first S beam and a second S beam, the first S beam and the second S beam are opposite in position, and the position between the first S beam and the second S beam is hollowed out; the bottom of the double-S-beam substrate is connected with the base force column, the upper half portion of the double-S-beam substrate is connected with the bottom plate, the FBG is arranged in a groove in the center of the double-S-beam substrate and penetrates through the hollow position between the double S-beams, and the lower half portion of the double-S-beam substrate is suspended and does not make contact with the bottom plate. When the diaphragm in the base senses the osmotic pressure, the force column brings the change of the double-S-beam substrate, the deformation is completely transmitted to the FBG, and the osmotic pressure is determined according to the change of the FBG; according to the invention, the osmotic pressure test with higher precision is realized.
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