1. System Design

2. System Design

3. Motion of motor shaft
 String tied around motor shaft and
allowed to hang vertically; distance
from base of shaft measured
 Voltage varied and motor instructed
to make one turn; distance of string
from base of shaft measured
 One sample t-test with 5%
significance level confirmed null
hypothesis that data above threshold
comes from normal distribution with
mean equal to expected distance
traveled of 29.6 mm (p = 0.3608)

4. Motion of Lens-Transducer system
One sample
t-test
Forward Backward
Mean
significantly
different
from 2 mm
(α = 0.05)
No No
P-value 0.2630 0.2194
 When compared against each other with
a two-sample t-test, the data from the
‘forward’ and ‘backward’ groups were
found to be statistically equivalent
(α = 0.05, p = 1.0000)

5. Effect of mass on deflection of central axis
 Customer requires maximum deviation of
object from central axis of lens-
transducer system be less than 1 mm
 Angular conversion gives limit of 0.3°
 Depending on where center of gravity of
lens-transducer system is (likely between
middle and end of shaft) its weight would
cause unacceptable deviation
 We added a track to guide motion and
prevent deflection (downside – more force
for motor to work against)

6. Alignment of motion system
 Image printed and attached to front end of probe
(lens)
 Device instructed to move by 2 mm intervals and
camera used to take pictures at each interval (4 trials,
6 images each)
 Pictures overlaid on each other and certain points (red
dots) tracked
 Deviation of center dot used to determine angular
deviation of central axis, and from that deviation (in
mm) at object

7. Alignment of motion system
Trial 1 Trial 2 Trial 3 Trial 4
h0: m = 0
ha: m ≠ 0
h0 ha ha ha
p-value 0.0514 0.0085 0.0185 0.0292
h0: m = 1
ha: m < 1
h0 h0 h0 h0
p-value 0.8877 0.9458 0.9336 0.8377
 One-way ANOVA revealed all
groups are statistically
equivalent (α = 0.05, p = 0.8978)
 One sample t-tests showed that
only trial 1 had a mean deviation
statistically equivalent to 0 mm
 One sample t-tests showed that
no group had a mean deviation
significantly less than 1 mm
 Majority of data below 1 mm
line; 3D-print for more accuracy

8. Future Changes to Design
 Change lens mounts to a singular piece for consistent attachment and alignment
of lenses to the probe body
 Cap is divided into two pieces to allow the transducer wire to pass through
and seal the system