CALIBRATION SOLUTIONS
HIGH END CAMERA SERIES
INFRATEC
Simultaneous mapping of wide temperature ranges
The HDR function of the high-end camera
series ImageIR® facilitates the analysis
of objects with extreme temperature
gradients
If you want to measure temperatures in a
very wide range with an infrared camera,
you normally do this in stages. The neutral
density filters are changed gradually
from time to time. Adjusted to a specific
temperature range, they prevent high-
intensity infrared radiation from striking
the camera detector and falsifying the
measurement result by depolarising the
detector pixels. The new High Dynamic
Range (HDR) function of the Infrared
ImageIR® camera series from InfraTec
eliminates the need for such interruptions.
It enables measurement scenarios with
extremely different temperatures to be
recorded continuously.
Capture temperature ranges of over 1,500
K in one image thanks to six positions
The starting point of the HDR function
is a fast rotating filter wheel. Designed
for such tasks, it rotates at more than
5,000 revolutions per minute. The wheel
provides up to six positions ensuring
maximum flexibility for demanding
measurement tasks. When recording in
HDR mode, multiple thermograms with
different integration times and different
filters are recorded quickly in succession
and compiled into an overall image with a
high dynamic range.
To activate the HDR function, it is sufficient
to select a previously defined calibration
range. After that, the rotation of the
rotating filter wheel and the composition of
the thermogram starts automatically. The
measuring range can span up to 1,500 K.
In the case of the ImageIR® 8300 hp, this
setting can be used to capture full-frame
images with (640 × 512) IR pixels. Based
on the frame rate synchronization of the
camera with the rotational speed of the
wheel, it is possible to achieve a temporal
resolution of 350 Hz.
Each position of the individual neutral
density filters has its own integration
time and corresponding temperature
calibration. The filters weaken the signal
of the measurement objects within the
desired temperature range, which reliably
prevents interference effects. Users
obtain high-contrast images in a wide
temperature range characterized by high
measurement accuracy.
Solution for measurement tasks with
high object temperatures and spectral
thermography
The tremendous benefits that come
with it become clear as soon as users
thermally analyse measurement objects
that experience temperature changes
over a very wide range within a very short
time. The necessary changing of filters
with a standard rotating filter wheel would
interrupt the measurement for several
seconds, rendering the results unusable.
The HDR function makes it possible to
quickly switch between calibration ranges
up to the maximum camera frequency.
In addition to extremely high temperature
applications, the fast rotating filter wheel
offers a wide range of measurement
options, in which different spectral ranges
need to be measured. Finally, users can
also use up to six spectral filters instead
of neutral density filters. Equipped in this
way, the ImageIR® infrared camera series
supports the professional examination of
materials with different radiation properties.
Regardless of which components users
choose for their desired model, the camera
can always be used with a fixed rotating
filter wheel.
For further information, please visit www.InfraTec.eu
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PECM Issue 43