2. Phantom VI
• Develop LabVIEW
Virtual Instrument (VI)
for control of and data
acquisition from the
Phantom high speed
digital camera.
3. Phantom VI
The PXI box connects to a
PCIexpress card in the PC
The PXI-6602 and PXI-6259 Data
Acquisition cards are installed in the PXI
box.
4. Phantom VI
The PXI-6259 card is connected
by the data cable to the SCC-68
Inside the SCC-68 are multiple
connection points.
5. Measurement and Automation Explorer (MAX)
I used MAX to configure the data acquisition devices to enable
communication between the Phantom LabVIEW VI and the camera.
6. Phantom VI
The Phantom Camera has 3 external
cable connectors on its back end.
The Capture and triggering cables connect
to the BNC connectors attached to the
SCC-68 counter outputs.
7. Phantom VI
The camera is set for External frame rate sync
(Red Arrow) and Resolution (Black Arrow) in
the Acquisition Settings window of the
Phantom 640 software.
When the message at the bottom of the
screen says “Waiting for Pretrigger…”, the
camera is ready for the signal from the
projectile breaking the plane of the laser
which will start the recording.
8. Phantom VI
• On the Front Panel of
the LabVIEW VI the user
can enter 3 capture
frame rates, and the
time desired for each
rate to run.
• More rate changes can
be easily added to the
VI.
9. Phantom VI
• The Block Diagram
shows how the VI
works.
• The entire program
is a stacked
sequence.
• The desired Frame
Rate value is fed to
a pulse counter on
the PXI-6259 card.
• The time is kept in a
while loop.
10. Phantom VI
• When the time expires,
the loop ends, which
advances the sequence
to the next frame rate/
time combination.
11. Phantom VI
• The camera records the
images as a Cine file in its
internal RAM.
• The Phantom software is
used to save the raw
video Cine file to a disk as
an .avi or .mov or .cin
• Border data, such as a
time stamp, can be added
to the images from the
button on this screen.
12. Video Conversion
The raw video file
recorded by the
camera may be up to
1 GB of data.
Video conversion
software can be used
to compress the
output video to a
more reasonable size
to conserve disk
space, or send via
email.
It can also be used to
change video formats.
14. Temp Monitor
• I created a LabVIEW VI
to monitor sample
temperatures using an
Omega RTD.
15. Temp Monitor
The Front Panel has controls for the file
path and sample rate. It also displays
the readings both on a thermometer
and as a waveform.
The block diagram shows how the
program reads the data via a connection
to the SCC-68. The program outputs the
average of 20 samples read from the
RTD probe and writes the data to a text
file.
18. EVMS Research
• Once I have an image
with clearly visible
trajectories, I used
Image Tool software to
pick the center of mass
of the particles at each
point along their
trajectories.
• The X-Y coordinates of
each point are recorded
in a text file.
• Each shot is printed and
its trajectories are
labeled on the printout.
19. EVMS Research
• The XY coordinates from the
image require a
transformation before they
can be used.
• I used Excel to open the text
file and to calculate X-512
and 512-y
• In this form the coordinates
from the image match the
camera coordinates.
20. EVMS Research
• The new
coordinates are
pasted into the
Data
Transformation
sheet of the Excel
Reduction File,
which transforms
the camera
coordinates to
Ejecta coordinates
measured in cm.
21. EVMS Research
• The ejecta
coordinates
are pasted into
the X-Y Values
sheet, which
calculates the
velocity in the
x direction.
22. EVMS Research
• The next step is to
calculate the
parabolic coefficients
of the ballistic
trajectories.
• The squared term is
found by dividing the
gravitational
acceleration
constant by the
square of the
velocity in the x
direction.
23. EVMS Research
• Since one of the
parabolic coefficients
is now known, I can
get a more accurate fit
to the data by
transforming the Y
value by adding the
squared term to the
LHS of the equation.
24. EVMS Research
• The ejecta’s x and
transformed y coordinates
are copied into JMP
statistical analysis software
to do a linear fit to the data.
• The values of the remaining
parabolic coefficients are
calculated along with
standard error for each and
Rsquare which describes
the overall quality of the fit.
25. EVMS Research
With all of the
parabolic
coefficients
known, I can
now calculate
the original
position on the x
axis, the ejection
angle and the
ejection velocity
of each particle
visible in the
image.
26. EVMS Research
The X position is normalized by dividing by
the measured crater radius.
This value is plotted, in linear and logarithmic
form, against the velocity and ejection angle.
27. Future Work
• The data I have analyzed here will be
compared with similar data obtained by
measurements of shots taken using the
Vertical gun with projectiles of different
densities.
• The existing scaling relationships (Housen et
al. 1983) will be analyzed to determine how to
relate projectile density to crater formation
and evacuation.
30. THANK YOU!
Dr. Mark Cintala
Dr. Jennifer Anderson
Frank Cardenas
Tom See
Terry Byers
Joseph Schneider
Dr . Susan Lederer
Courtney Crooks
Brian From
