Strain sensor able to withstand large deformation in high temperature environment

Abstract

The invention discloses a strain sensor able to withstand large deformation in a high temperature environment. The sensor relates to the technical field of mechanical sensors and is able to sense and measure largely deformed structures in a high temperature environment at low cost. The strain sensor comprises a protection box, springs and two sapphire fibers. The springs are cylindrical helical springs; the two sapphire fibers are integrated into different springs respectively. The protection box is formed by two oppositely arranged moveable boxes. The two sapphire fibers are sealed in the protection box, connected to the two boxes forming the protection box through one end of their own and closely attached to the surfaces of the structures at two sides of the protection box through high temperature withstanding adhesive agent. The springs integrated by one sapphire fiber and the protection box are in fixed arrangement to measure strains. The springs integrated by the other sapphire fiber and the protection box are not in fixed arrangement so as to measure the deformation caused by an environment to the sapphire fiber. The invention finds applications for large deformation measurement in a high temperature environment.

Description

technical field [0001] The invention relates to the technical field of mechanical sensors, in particular to a strain sensor subjected to large deformation in a high-temperature environment. Background technique [0002] With the continuous development of aircraft design technology, the operating environment of aircraft has become more and more complex. Harsh environments such as high temperature, high pressure, and corrosion will have a certain impact on the aircraft structure. In order to accurately grasp the situation of the aircraft structure in flight test and daily maintenance, especially in high temperature environment, the strain sensor is used to detect the stress change of the aircraft structure. Moreover, the concept of a flexible structure is also proposed in the current design, and the deformation of the flexible structure will be larger than that of the conventional structure. [0003] For the measurement of high temperature environment, the current application...

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Problems solved by technology

[0003] For the measurement of high temperature environment, the current application is more mature fiber optic sensor, but the fiber optic sensor can only measure the conventional strain, due to the characteristics of the fiber itself, such as the fiber attenuation caused by Rayleigh scattering, inherent absorption, bending and extrusion, etc., will reduce the optical fiber. The service life makes it difficult for fiber optic sensors to withstand large deformations

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