Revisiting Piezoelectric Sensor Calibration Methods Using Elastodynamic Body Waves

The Inhomogeneous Waves in a Rotating Piezoelectric Body

This paper presents the analysis and numerical results of rotation, propagation angle, and attenuation angle upon the waves propagating in the piezoelectric body. Via considering the centripetal and Coriolis accelerations in the piezoelectric equations with respect to a rotating frame of reference, wave velocities and attenuations are derived and plotted graphically. It is demonstrated that rot...

Damage Detection Using Guided Waves and Piezoelectric Wafer Active Sensor Arrays

This paper presents our research work on using the guided waves for damage detection generated by piezoelectric wafer active sensors (PWAS) arrays that are permanently attached to the structure. The data collection and processing is performed using the embedded ultrasonics structural radar (EUSR) concept. Research objectives includes: (a) improving damage detection in the array near field; (b) ...

Robotic TCF and rigid-body calibration methods

Blind Sensor Calibration using Approximate Message Passing

The ubiquity of approximately sparse data has led a variety of communities to great interest in compressed sensing algorithms. Although these are very successful and well understood for linear measurements with additive noise, applying them on real data can be problematic if imperfect sensing devices introduce deviations from this ideal signal acquisition process, caused by sensor decalibration...

Misalignment Calibration Using Body Frame Measurements

Manufacturing flaws and construction realities always impose a misalignment between multiple sensors (even though they remain rigidly coupled together). An algorithm was developed to determine the misalignment between any two three-axis sensors whose unit vectors are known in the inertial frame and can be measured in body coordinates. The input to the misalignment algorithm is a locus of measur...