Add measurement of spurious resonances

piezostack_apa300_mel_lab_5may2021/piezo_stack_mel_5may2021.m

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+% 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