Related Experiment Video
Updated: Apr 12, 2026

Production of a Strain-Measuring Device with an Improved 3D Printer
Published on: January 30, 2020
Distributed strain measurement based on long-gauge FBG and delayed transmission/reflection ratiometric reflectometry
Abstract:
In this paper, we propose a delayed transmission/reflection ratiometric reflectometry (DTR(3)) scheme using a long-gauge fiber Bragg grating (FBG), which can be used for dynamic structural deformation monitoring of structures of between a few to tens of meters in length, such as airplane wings and helicopter blades. FBG sensors used for multipoint sensing generally employ wavelength division multiplexing techniques utilizing several Bragg central wavelengths; by contrast, the DTR(3) interrogator uses a continuous pulse array based on a pseudorandom number code and a long-gauge FBG utilizing a single Bragg wavelength and composed of simple hardware devices. The DTR(3) scheme can detect distributed strain at a 50 cm spatial resolution using a long-gauge FBG with a 100 Hz sampling rate. We evaluated the strain sensing characteristics of the long-gauge FBG when attached to a 2.5 m aluminum bar and a 5.5 m helicopter blade model, determining these structure natural frequencies in free vibration tests and their distributed strain characteristics in static tests.
Related Concept Videos
Measurements of Strain
Design Example: Strain Gauge Bridge or Wheatstone Bridge
Temperature Dependent Deformation
Deformation of Member under Multiple Loadings
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
Stress-Strain Diagram
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

