Plan A: Lightsable
Luke Skywalker holding his green lightsable.
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Plan B: Radial Strain Measurement Device
Sample inside a triaxial cell
1. On Specimen Clamp
2. Laser Measurement
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3.Cantilever beam measures bending strain then converting to radial strain
4.Capacitive Proximity Sensor
Some Open Questions
1. Laser measurement, what kind of sensor? dimension to fit in triaxial cell?
2. What's the best material for a cantilever beam so that the stiffness
is suitable for the application?
3. Strain gauge: What's the configuration of the resistors?
sensitivity of the strain gauge?
4. Capacitive Proximity Sensor, can it withhold 1MPa cell pressure?
Updates
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Biasing opamp with 0.5 V
I wanna use 1.1v internal vref, and unipolar mode of the ATTINY chip.
differential oppamp with a gain of 10
Trying to understand this chart
Need some big resistors
bias the ground voltage
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