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solutions have been developed that can successfully measure bead position and bead
width. However, they cannot provide a cross-section profile, which is necessary to verify dispense volume at every position. For example,
if vibration causes the dispense nozzle to scuff
the part surface and leave only a thin film of
bead, a 2D system may not be able to detect
the inadequate coverage.
To provide a cross-section profile of the
bead, 3D techniques may offer a more suitable
solution. In fact, the industry is leaning toward
3D laser triangulation. However, the arbitrary
dispensing direction and limited space available around the dispensing nozzle presents a
design challenge for developers using general-purposed single-laser line 3D sensors.
One approach has been to implement a
motorized single laser line to trail the arbitrary
dispensing direction. However, with 400 to
1,000mm/s speeds common in modern high-
productivity equipment, motion systems capa-
ble of responding quickly and reliably enough
to handle sharp dispensing direction changes
tend to be complex and costly.
Another option, taken by Coherix (Ann
Arbor, MI, USA: www.
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3D visualization and inspection capability on
the bead empowers design engineers to specify the bead in a manner directly related to
its functionality and enables manufacturing
to more reliably control and optimize the dispensing processes.
different codes, and the image signals are captured in one single photograph. These coded
image signals are subsequently separated using an encryption key on the computer.
A German company has already developed a prototype of the technology, which means
that within an estimated two years, more people will be able to use it.
To illustrate the technology, the researchers have successfully filmed how light—a collection of photons—travels a distance corresponding to the thickness of a paper. In reality, it
only takes a picosecond, but on film the process has been slowed down by a trillion times.
Currently, high-speed cameras capture images one by one in a sequence. The new technology is based on an innovative algorithm, and instead captures several coded images in one
picture. It then sorts them into a video sequence afterwards.
The film camera is initially intended to be used by researchers who literally want to gain
better insight into many of the extremely rapid processes that occur in nature. Many take
place on a picosecond and femtosecond scale. “This does not apply to all processes in nature,
but quite a few, for example, explosions, plasma flashes, turbulent combustion, brain activity
in animals and chemical reactions. We are now able to film such extremely short processes,”
says Elias Kristensson.
Most days, Elias Kristensson and Andreas Ehn conduct research on combustion—an area
which is known to be difficult and complicated to study. The ultimate purpose of this basic
research is to make next-generation car engines, gas turbines and boilers cleaner and more
fuel-efficient. Combustion is controlled by a number of ultrafast processes at the molecular
level, which can now be captured on film.
Source: Lund University; http://www.lunduniversity.lu.se/article/the-worlds-fastest-film-camera-when-light-practically-stands-still - Gail Overton, Senior Editor, Laser Focus World
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