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

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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


Setup

Setup


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


Balloon popping with flour using microphone to trigger flash

Balloon Popping, with flour using microphone to trigger flash


Flash modification

Flash Modification

Before

After


Resistor trials

Resistor trials

1k Ohm resistor,

Too Dark

10k Ohm resistor,

Too Light


Resistor trial cont

Resistor Trial Cont.

4.7k Ohm resistor,

Not too dark or light


Popping water balloons

Popping water balloons

-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

-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

-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.

.02 Second Delay

.03 Second Delay


Balloon dropping cont

Balloon Dropping Cont.

.04 Second delay

.05 Second delay


Capturing pellet mid flight

Capturing Pellet Mid-Flight

-Used ballistics sensor to trigger flash

-used 680 Ohm resistor

-positioned flash as close as possible


Capturing pellet trials

Capturing Pellet Trials

270 Ohm Resistor,

Too Dark and Blurry

820 Ohm Resistor,

Too Blurry


Money shot

Money Shot

-Captured pellet inside of water balloon

-4.7k Ohm resistor

-Ballistic sensor triggered flash


Simple kinematics

Simple Kinematics

  • 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.

  • 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:

http://physicsed.buffalostate.edu/EURP08


Reference

Reference

  • 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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