The
nanopositioning drive project came about as a desire to automate the
positioning of a mirror within an interferometer. This project is
undertaken with the long-term goal of producing a handheld device that
is capable of performing quick, easy, and accurate measurements as they
apply to spectroscopy. The engineering challenge comes from the fact
that the motion of the mirror must be precise on a nanometer scale with
velocity stability better than one percent. Motion and vibration levels
of the drive system will be evaluated using high precision laboratory
instruments to ensure it meets the design criteria. The team will
design an experiment that involves a test fixture, procedure, and data
analysis. Variables that will change during the experiment include the
step size, motor type, and mechanical linkage method. Outputs to the
experiment are motor vibration amplitude and velocity stability.
Efforts will be made to reduce the recorded vibration amplitude either
by electronically modifying the input waveform or using another
mechanical solution.
Target
Specifications
These metrics are listed in order of
importance.
|
Rank
|
Need
|
Metric
|
Marginal Value
|
Ideal Value
|
Units
|
|
1
|
High Quality Motion
|
Velocity Stability
|
1
|
<1
|
%
|
|
2
|
Speed
|
Linear Velocity
|
.75<V<1.25
|
1
|
cm/s
|
|
3
|
Equipment Verification
|
Successful Repeat Rate
|
2
|
<2
|
%
|
|
4
|
Motion
|
Distance
|
1
|
---
|
cm
|
|
5
|
Durability
|
Acceleration
|
>10
|
>>10
|
Gs
|
|
7
|
Test Fixture
|
Cost
|
1500
|
<1500
|
USD
|
|
6
|
Testing Conditions
|
Temperature
|
73
|
73
|
°F
|
