High-speed cameras
SELECTING CAMERAS
FOR HIGH SPEED
IMAGING TECHNIQUES
There are a number of important criteria to consider when
choosing a high-speed camera
// TIM CALLENBACH
High-speed imaging such as Digital
Image Correlation, Particle Image
Velocimetry, and Schlieren Imaging
provide insight into various aspects of the
strength and durability of materials, the
characteristics of engine combustion
processes, the aerodynamics of objects in
flight, and much more.
Digital Image Correlation (DIC), is a
non-contact 2D or 3D imaging technique
used to determine the extent of
deformation, vibration and strain on
materials undergoing some type of
physical stress. DIC analyzes high-speed
video to identify and measure movements,
some of which are incredibly small, within
a high-contrast speckle pattern that has
been applied to the surface of the material
being tested. The speckle pattern
movements are examined to provide
automatic calculations and visualization of
the degree of deformation, vibration or
84 SHOWCASE \\ AEROSPACETESTINGINTERNATIONAL.COM
strain found on the material. Various color
palettes can be used to display the stress
measurements for effective visualization.
Test materials are typically, but not
exclusively, made from metals, composites,
ceramics or polymers.
DIC can be used for applications such as
the structural testing of an aircraft’s wings
or fuselage, bird impact testing, turbine
engine testing, wheels and braking system
testing, and more.
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