Actuator–FBG response matrices

This dataset contains frequency-swept actuator–sensor response measurements acquired during ultrasonic burst excitation in a test structure instrumented with piezoelectric transducers (PZTs) and a fiber Bragg grating (FBG) sensing channel (photodetected output). One PZT is used as the actuator (Actuator 1), and the resulting responses are recorded on multiple sensing channels. The dataset is intended for transfer/response characterization (actuator → sensor) as a function of excitation frequency, and for assessing repeatability across repeated measurement runs.

Data organization:
All files are located in the top-level folder “PZT_FBG_Response_Matrices_DataSet/”. The four MATLAB files “Actuador 1 M1.mat”, “Actuador 1 M3.mat”, “Actuador 1 M4.mat”, “Actuador 1 M6.mat” correspond to four repeated acquisitions of the same experiment definition (same channel layout and excitation sweep), recorded in separate runs. The file “Actuator_Sensors_Relative_Positions.png” documents the relative placement and numbering of the actuator/sensor channels used by the acquisition software (e.g., the actuator location and sensing-channel indices, including the FBG channel). The Excel file “PZT_FBG_Response_Matrix_IndexMap.xlsx” provides the complete index mapping between the acquisition table indices and the MATLAB variable names, together with the associated actuation/sensing metadata.

MATLAB file contents and index meaning: Within each .mat file, the primary signals are stored as variables s0 … s56. Each sK is a single-precision time-domain vector (typically 20000×1) representing one recorded response waveform for a specific actuator–sensor path under one excitation frequency. During acquisition, the software labels responses with indices 1–57; in the saved MATLAB files these correspond to s0–s56 (software index i maps to MATLAB variable s(i−1)), as listed explicitly in the provided Excel mapping file. In the documented setup, the excitation is BURST3, with 30 V drive amplitude and 40 dB gain, and the actuation frequency is swept over discrete values from 50 kHz to 500 kHz (as enumerated in the acquisition-definition table and in the Excel index map). Users should interpret each sK by referencing PZT_FBG_Response_Matrix_IndexMap.xlsx (actuator number, sensor number/channel, excitation parameters, and frequency) and Actuator_Sensors_Relative_Positions.png (channel numbering and relative geometry).