Laser interferometry: particle motion/strain estimation (surface measurements)
Description
This dataset contains time-domain measurements of ultrasonic wave propagation in a resin cylindrical specimen excited by piezoelectric transducers (PZTs) and observed using a laser interferometer. The objective is to provide synchronized electrical actuation/response traces together with interferometric surface-motion measurements at multiple positions, enabling analysis such as particle displacement/velocity comparison across locations, time-of-flight estimation, and (with an assumed or calibrated wave speed) strain estimation. Experimental principle and setup: An AWG drives a TX amplifier connected to a PZT actuator mounted on one end of the resin cylinder, while an identical PZT at the opposite end is measured via an RX amplifier. PZT_TX/PZT_RX and the laser interferometer output are recorded on the same oscilloscope time base; the interferometer measures surface motion at four reflector positions (R1–R4) along the cylinder. Data Organization: All files are under the top-level folder “Laser_Interferometer_Dataset/”. Subfolders correspond to the actuation waveform (and, where indicated, the amplitude condition encoded in the folder name): “Gaussian_Input_20AmpInput_30AmpOutput/”, “Hamming_Input/”, “Hamming_Input_20AmpInput_30AmpOutput/”, “Hanning_Input/”, “Rectangle_Input/”, “Rectangle_Input_20AmpInput_30AmpOutput/”, and “Sinuous_Input/”. Each waveform folder contains the same set of Excel-compatible time-series files: “Pos_R1_Disp”, “Pos_R2_Disp”, “Pos_R3_Disp”, “Pos_R4_Disp” (interferometer displacement at positions R1–R4), “Pos_R1_Vel”, “Pos_R2_Vel”, “Pos_R3_Vel”, “Pos_R4_Vel” (particle velocity at R1–R4), and “PZT_TX”/“PZT_RX” (oscilloscope electrical traces of actuator drive and receiver response). Each file contains the recorded time vector and the corresponding measured signal (units as provided in the file).
Files
Steps to reproduce
Prepare a resin cylindrical specimen. Mount one PZT as an actuator at one end of the cylinder and mount an identical PZT as a receiver at the opposite end. Attach four reflective targets along the cylinder longitudinal direction to define the laser measurement locations R1–R4. Electrical excitation/acquisition: Connect AWG → TX amplifier → actuator PZT. Connect receiver PZT → RX amplifier → oscilloscope. Record the actuator drive and receiver response as oscilloscope channels (saved as PZT_TX and PZT_RX). Laser interferometer acquisition (time-synchronized): Aim the laser interferometer at reflector position R1 and record the interferometer output on the same oscilloscope time base (same sampling/time reference) as the PZT channels. Repeat the interferometer measurement for R2, R3, and R4 while keeping the excitation and oscilloscope settings consistent, producing displacement and velocity time series for each position (Pos_R1…Pos_R4). Repeat across excitation waveforms: Generate and apply different actuation waveforms (e.g., Gaussian-windowed, Hamming/Hanning-windowed, rectangular, sinusoidal), and save each waveform case into its own folder under Laser_Interferometer_Dataset/ (folder names encode waveform type and, when applicable, the amplitude condition). Data verification and reuse: For each waveform folder, confirm that Pos_R1_Disp…Pos_R4_Disp, Pos_R1_Vel…Pos_R4_Vel, and PZT_TX/PZT_RX are present. The synchronized traces can then be used for time-of-flight analysis between positions, frequency-domain analysis (FFT), and strain estimation from velocity when a longitudinal wave speed is assumed or calibrated.
Institutions
- Universidad Politécnica de MadridMadrid, Madrid
- Université Gustave EiffelÎle-de-France, Champs-sur-Marne