A kind of internal stress measuring device and preparation method thereof

Abstract

The invention discloses an internal stress measuring device and a preparation method thereof. The internal stress measuring device is mainly composed of a main body and a bottom cover. Both the main body and the bottom cover are processed by 3D fused deposition printing technology, which is an integrated design and overcomes the shortcomings of the traditional processing technology of the existing sensor. The internal stress measuring device is set as a double-layer integrated structure, and the first fiber grating sensor and the second fiber grating sensor are embedded in the device, so that the first fiber grating sensor and the first diaphragm, the second fiber grating sensor and the hollow cylinder are Due to the characteristics of fragility, slenderness, easy breakage and poor shear resistance, bare fiber grating is difficult to directly achieve practical application in civil engineering, and it can not only measure soil overburden The pressure can also measure the water pressure in the lower part of the soil, so as to achieve the goal of two purposes of a sensor. The preparation method shortens the processing cycle and reduces the manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of fiber grating pressure sensors, in particular to an internal stress measuring device and a preparation method thereof. Background technique [0002] Fiber Bragg Grating (FBG) is an optical sensor that uses an intense ultraviolet laser to inscribe in the center of a standard single-mode fiber in a spatially varying manner, and is used in civil engineering, aerospace, petrochemical, electric power, Medical, shipbuilding and many other fields. [0003] Existing sensors generally use traditional molding technology, and traditional molding technology has some shortcomings in sensor development: model processing cycle is long, small batch production is expensive, sensors are generally assembled, and can only measure soil pressure. Due to its fragility, slenderness, easy breakage and poor shear resistance, bare fiber grating cannot directly meet the standard of practical application in civil engineering. SUM...

AI Technical Summary

Problems solved by technology

[0003] Existing sensors generally use traditional molding technology, and traditional molding technology has some shortcomings in sensor development: long model processing cycle, high cost of small batch production, sensors are generally assembled, and can only measure soil pressure

Bare fiber gratings cannot directly meet the standards for practical applications in civil engineering due to their fragility, slenderness, easy breakage, and poor shear resistance.

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