% Vibration measurement on:
% Piezo stack in MEL lab - 5 may 2021

% Excitation: hammer dytran with metal tip : 230e-6V/N
% Response: laser vibro dual fibres 1mm/s/V

% recorded signals and saved traces
% laser fibres on both sides edges of stack 
--> photo: piezo_rotation.jpg
--> plot: piezo_stack_rotation_5may2021.png
% meas3 hammer on edge right: green
% meas4 hammer on centre top : blue
% meas5 hammer on edge left : orange

% laser fibres on base and top of stack (vertical axis)
--> photo: piezo_vertical.jpg
--> plot: piezo_stack_rotation_vertical_5may2021.png
% meas7 hammer on vertical centre top : orange

% Stack rotated 90deg - laser fibres on upper interface of stack (top and bottom of interface plate, ~1cm apart)
--> photo: none
--> plot: piezo_stack_rotation_interface_5may2021.png
% meas8 hammer on interface top : orange
