Principles and Application of Polyimide Fiber Bragg Gratings for Surface Strain Measurement

摘要: Although theoretical investigation has demonstrated that fewer strain transfer layers imply a greater ratio, as well increased accuracy, most researchers are still focused on investigating encapsulated Fiber Bragg gratings (FBGs) in surface measurements. This is because, traditional view, bare FBGs too fragile to be mounted the substrate for measuring strain. Polyimide may provide better balance point between accuracy and protection. A new method measure with polyimide fiber proposed. Bare have coating, but like regular non-coated FBGs. gives higher ratio response frequency. can considered uncoated The coupling of matrix material improved compared without coating. In order verify capacity measurement, obtain concrete specimen SM130-700 interrogator from Micron Optics Incorporation (MOI) sampling frequency maximum 2000 Hz. experiment demonstrates work even dynamic measurements such explosion measurement. Validation this paper also proposed increase FBG substrate.