An optical fiber sensing system temperature compensating method

Abstract

The invention provides an optical fiber sensing system temperature compensating method comprising the following steps: 1, temperature calibrating is carried out on an optical sensor to obtain a temperature sensitivity coefficient K[T1]; 2, temperature calibrating is carried out the optical sensor attached in an adhesive mode to the surface of a test piece, of which the materials is same with a to-be-measured piece so as to obtain a material uniform thermal expansion coefficient K[T2]; 3, strain calibrating is carried out on the optical sensor to obtain a strain sensitivity coefficient K [Epsilon]; and 4, in strain and deformation measurement carried out on the to-be-measured piece, strain applied to the to-be-measured piece is measured by an optical fiber strain sensor, and an optical fiber temperature sensor is used to make temperature compensating for the strain sensor; and influences by uniform thermal expansion are rejected to obtain effective deformation strain data. The invention is mainly used for occasions such as strain and deformation caused by fore bearing and non-uniform thermal expansion in optical fiber sensing network measurement, and difficulties in measuring by the optical fiber sensor with regard to deformation and uniform thermal expansion of the measured piece and strain and temperature cross sensitivity are overcome.

Description

technical field [0001] The invention belongs to the field of structural health monitoring, in particular to a temperature compensation method for an optical fiber sensing system. Background technique [0002] With the continuous development of aircraft and spacecraft, large-scale, complex and functional gradually become the inevitable trend of the development of modern engineering structures, which makes the service environment of the structure itself increasingly complex, and the damage forms of the structure itself are constantly diverse. Due to impact, vibration, The problem of structural damage caused by factors such as extreme environments has also become increasingly prominent. For engineering structural parts, the main damage types such as internal cracks in the structure, internal fractures in composite materials, and corrosion of metal structures have the characteristics of strong concealment of damage, complex structural failure mechanisms caused by damage, and dif...

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Problems solved by technology

[0005] At present, the application of fiber gratings in many developed countries in the world mainly focuses on the monitoring of structural strain, temperature, and deformation. China has also begun to use fiber gratings to monitor structural strain, temperature, and deformation. Difficulties in the deformation and uniform thermal expansion of the test piece and the cross-sensitivity of strain and temperature

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