Introduction
Methods
Camera
Specs
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General
When creating
a high-speed video. There are three basic things to do. First, the
camera is positioned and focused on a well-lit subject. Next, the
record button on the video camera is depressed. Finally, after the
event, the camera is stopped. This can be done in multiple ways. If
a trigger is used, the camera stops automatically. If the event being
captured is predictable, the record button can simply be pressed a
second time after the event is done. To get the videos on a computer,
we captured them to a regular video camera, and then using a capture
card, put them on a computer.
Splashes
To capture video
of water splashes, I used a "splash box" device. This consists
of a wooden box frame with a dropper attached to the top. Directly
below the dropper is a photogate sensor. The photogate consists of
an infrared transmitter and reciever. When the infrared beam is broken
by a water droplet, a voltage signal is sent to the video camera.
Using the trigger point on the
video camera, a suitable time frame could be obtained.
Collisions
The collision
videos were made using a very large slingshot. This slingshot launched
various balls at a wall approximately 8 feet away from the slingshot.
A sound trigger, which uses a piezoelectric microphone to detect lound
sounds, was used to trigger the video camera. Again, the trigger
point setting was used to get a good time frame.
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