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For over two decades, optical scanner technology has been improving the way we process raw materials, inspect finished goods and how we conduct a variety of other processing operations. Hermary Opto's scanner technology employs light in various forms to measure the shape or a particular dimension of an object. We apply this technology using two distinctive methods;
 Optical Triangulation -
where light is projected onto an object at a known angle and is viewed
from a different angle. A measurement of the object position relative to the projector and viewer is then obtained. |
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Hermary Opto's scanner technology is widely used in log optimization systems in sawmills. With the high mesurement resolutions and computer processing speeds that are available, sensing technology now has a broad range of applications including automotive manufacturing, transportation management, and food processing. | |
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 Our scanner technology operates on the basis of optical triangulation. For example, close one eye and fix your other eye on an object in the distance. Now, reverse the process. Your eyes see the same object from slightly different angles. Our brains resolve the images from two angles into one image which also has range information. This is what we see through a process called passive 3D ranging. Similarly
with laser camera sensor technoloy, the sensor projects laser beams
onto an object and then images the laser spot reflected from the object
on an electronic camera. The position of the image on the camera is
related to the range of the object. This allows a computer to measure
the shape or size of an object. |
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  With
the sheet of light method, the plane is seen as a curve on the surface
which is imaged by a two dimensional camera looking from either an
upstream or downstream position. The laser plane is the reference, so
the scanner reports points in XY co-ordinates only. A given point in
the XY profile mathematically determines the intersection of the laser
reference plane and the corresponding line through the lens centre and
illuminated pixel. Each camera then reports a series of pixels which is
translated into a corresponding series of points that represent the
cross section.
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Hermary Opto scanners employ the co-planer configuration, which has
several advantages. With this method, an array of laser reference beams are arranged in a
plane and in the same plane, a linear imaging system is positioned so
that it can see the laser reference beams inside a predetermined scan
zone. Space requirements for a co-planer scanner are minimal, typically
a few inches, whereas sheet of light scanners require substantial space
in the Z direction to achieve reasonable triangulation. In addition,
co-planer systems view a narrow strip directly across from itself,
whereas a sheet of light scanner views a large area either upstream or
downstream making it more difficult to shield from plant lighting which
both methods require. Most importantly, co-planer scanners have the
ability to see an entire surface which allows for three dimensional
profile scanning. |
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We encourage you
to contact us with your scanning
requirements and look forward to your comments and inquiries.
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