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Optical fibers have been successfully utilized for point sensors targeting physical quantities (stress, strain, rotation, acceleration), chemical compounds (humidity, oil, nitrates, alcohols, DNA) or radiation fields (X-rays, β particles, γ-rays). Similarly, bundles of fibers have been extremely successful in imaging visible wavelengths for medical endoscopy and industrial boroscopy. This work presents...
Based on the characteristics of strains which lead to failures of turbine blades inside the aero-engine, a three-dimensional fiber-optic tip-clearance measuring method using two-circle reflective coaxial fiber bundles as three measuring units is presented. Firstly, mathematical model of each unit when there exists radial clearance together with inclination at axial and circumferential direction of...
The purpose of this study is to develop a model-based method for detecting optical fiber sensor fault in aero-engine linear discrete time invariant (LDTI) system considering both disturbances and uncertainties. Firstly, the fiber-optic sensors are analyzed and utilized to measure the aero-engine compressor output and aero-engine compressor is reduced to a 4-input 3-output single-spool state space...
the purpose of this study is to develop a method for identifying dynamic posture in the lower extremity using optical fiber sensor, which could control the mechanical structure to follow the movement of the joint. Firstly, lower extremity is reduced to two-joint model and the principle of kinematics is analyzed. Secondly, the fiber tape is used in the dynamic pose identification system which is the...
Displacement sensor of two-circle reflective coaxial fiber bundle for measuring slide bearing of rotating machinery is designed. A mathematical model of modulation function for the fiber bundle sensor is established. The factors influencing the sensorpsilas characters, including receiving fiber core radius a0, axis space d between transfer fiber and receiving fiber, the maximum entrance angle thetas...
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