Inexpensive very high speed photography for mechanics
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Inexpensive Very High Speed Photography For Mechanics. Funded by the Early Undergraduate Research Program By: Melissa Chudyk , Steven Dutter , and Steven Wilser Advisor: Daniel L. MacIsaac. Setup. The Time Machine.

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Inexpensive very high speed photography for mechanics

Inexpensive Very High Speed Photography For Mechanics

Funded by the Early Undergraduate Research Program

By: Melissa Chudyk, Steven Dutter, and Steven Wilser

Advisor: Daniel L. MacIsaac



The time machine
The Time Machine

This is The Time Machine, a device created by Brian Mumford. The purpose of The Time Machine is high speed, and time lapsed photography.

The Time Machine consists of a 16 character LCD screen, five push buttons, and a sensitivity control. There are also four jacks at the top end of the machine. They are the flash output, sensor input, shutter output, and AC adaptor.

The Time machine has ten modes of operation that you can use. All of the modes can be used for different photographing situations.


Balloon popping 1 st attempt using microphone to trigger flash
Balloon Popping, 1st Attempt using microphone to trigger flash



Flash modification
Flash Modification flash

Before

After


Resistor trials
Resistor trials flash

1k Ohm resistor,

Too Dark

10k Ohm resistor,

Too Light


Resistor trial cont
Resistor Trial Cont. flash

4.7k Ohm resistor,

Not too dark or light


Popping water balloons
Popping water balloons flash

-Used 4.7k Ohm resistor in flash

-Microphone sensor was setup near balloon to trigger flash


Multiple exposure of ping pong ball
Multiple Exposure of Ping Pong Ball flash

-1k Ohm resistor

-Left shutter open, set flash to fire 10 times

-Rolled ping pong ball off ramp in order to get this motion

-microphone sensor set off flash when ball first hit ground


Dropping water balloons using a delay
Dropping Water Balloons using a Delay flash

-Using 4.7k Ohm resistor in flash

-When balloon hit ground the microphone sensor triggered the flash

-All Balloons were dropped from same height

-.01 second delay used


Balloon droppings cont
Balloon Droppings Cont. flash

.02 Second Delay

.03 Second Delay


Balloon dropping cont
Balloon Dropping Cont. flash

.04 Second delay

.05 Second delay


Capturing pellet mid flight
Capturing Pellet Mid-Flight flash

-Used ballistics sensor to trigger flash

-used 680 Ohm resistor

-positioned flash as close as possible


Capturing pellet trials
Capturing Pellet Trials flash

270 Ohm Resistor,

Too Dark and Blurry

820 Ohm Resistor,

Too Blurry


Money shot
Money Shot flash

-Captured pellet inside of water balloon

-4.7k Ohm resistor

-Ballistic sensor triggered flash


Simple kinematics
Simple Kinematics flash

  • Length of gun barrel = 0.397 m

  • Length of barrel and sensor = 0.58 m

  • Velocity of pellet determined by sensor = 198 m/s

  • Mass of pellet = 7.5 g = 0.0075 kg

  • Distance from barrel to backstop = 6.12 m

  • Speed of sound = 340.29 m/s

  • Acceleration of pellet in barrel:

  • Force exerted on pellet:


Simple kinematics cont
Simple Kinematics Cont. flash

  • The time sound takes to get to the backstop:

  • Time between sound hitting backstop and pellet hitting backstop, determined from LabView data = 0.028 s = 28 ms

  • Time for pellet to hit backstop = the time of sound to hit + the time between = 0.018 s + 0.028 s= 0.046 s = 46 ms

  • Average velocity of pellet:

  • Time pellet is in barrel using acceleration in barrel:

  • Time pellet is in barrel using length of barrel:


Visit our website at
Visit our website at: flash

http://physicsed.buffalostate.edu/EURP08


Reference
Reference flash

  • Winters, Loren (1996). A Tutorial in High-Speed Photography with Electronic Flash. Retrieved July 3, 2008, from http://www.hiviz.com

  • Mumford, B. The time Machine. Retrieved June 2, 2008, from The Time Machine Camera Controller/Intervalometer Web site: http://www.bmumford.com/photo/camctlr.html

  • Winters, L.M. (1990 May). High-speed flash photography with sound triggers. The Journal of the AcousticalSociety of America , 87, Retrieved August 7, 2008, from http://scitation.aip.org


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