imanto - Fraunhofer IWS

FRAUNHOFER-INSTITUT FÜR WERKSTOFF- UND STRAHLTECHNIK IWS
imanto
Lighting, Software, Tools
Non-destructive screening, 100 % inspection, and characterization
by hyperspectral imaging
OVERVIEW
imanto offers
Modern optical spectroscopy must meet many demands with regard to flexibility, acquisition time, data
evaluation, process integration, and process interaction. Furthermore another upcoming requirement for
industrial products is nowadays a 100 percent quality
control option. A dedicated spectroscopic technology,
which meets all the mentioned criteria, is the hyperspectral imaging (HSI) technology. With imanto the
Fraunhofer IWS offers powerful tools and solutions to
realize optical imaging spectroscopy for different requirements.
TECHNOLOGY
Based upon early multispectral imagers, the ongoing
technological development allows the usage of larger
sensor sizes. The new sensors offer several hundred
spectral bands for a few hundred spatial positions at
one time. Furthermore the HSI technology has no
moving optical parts, thus the robustness of the systems is increased.
Standard HSI-systems are available for the ultraviolet/visual spectral range (UV/VIS) and for the near
infrared range (NIR – sometimes also called shortwave infrared: SWIR). The available information includes:
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information in UV/VIS
400 - 1000 nm
o
optical properties:
color, absorption, scattering
o
fluorescence properties
o
electronic states
o
surface morphology
information in NIR
1000 - 2500 nm
o
chemical features
o
sample composition
o
contaminations and defects
o
surface morphology
Dependent on the probed sample, the adequate spectral range is selected. The acquisition speed for the
systems is up to 300 Hz. Also a combination of two
different HSI systems to gather both information classes can be realized.
 non-destructive product testing, process monitoring and materials characteristics analysis
 lighting tools:
options for reflective (glancing) substrates
and special adaptions
 software package:
real-time option, multivariate statistics
 VIS- and NIR-HSI microscopy
 customer-driven solutions
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feasibility studies
process monitoring development
industrial adaptions
data mining and statistical analysis
real-time solutions
DATA HANDLING
A challenging task for hyperspectral imaging is the
data handling due to the high acquisition rates. To
overcome this problem, imanto pro has been developed to provide a fast calculating software. The software package can be used for stand-alone applications as well for real-time tasks. Algorithms for data
mining and statistical analysis can be integrated into
imanto pro – just according to your demands.
YOUR ADVANTAGE
The scientists of the Fraunhofer IWS help to analyze
the necessary background for the implementation of
the HSI technology and to adapt the system to process control or production lines. Beside the hardware
integration all further steps can be supported by
Fraunhofer IWS: feasibility studies, software adaption,
development and implementation of data processing
algorithms and companionship during industrial adoptions. In fact, a broad portfolio of services can be
tailored to the given specifications. Hardware tools for
lighting, microscopy and further accessory can be
additionally developed and customized to the special
needs.
imanto lighting
 sources
 spot size
 beam angle
 unit power
 spectral range
 dimmable option
 unit size (WxHxD)
3 - 6 per unit
5 cm or 7 cm
other on request
8°
max. 150 W
(20-50 W / source)
800 - 2500 nm
341 x 85 x 195 mm
(VP – variable power)
261 x 85 x 185 mm
(CP – continuous power)
IMANTO LIGHTING
For several imaging and spectral applications a broadband lighting is necessary for the acquisition of full
information depth. The halogen lighting covers the
full spectral range from visual up to the near infrared/SWIR range.
FLEXIBLE LIGHTING SOLUTION
A flexible setup allows the adaption to almost every
lighting challenge. High quality components enable a
long-term operability.
All lighting solutions are ready-to-use and will be
combined with a special designed power source.
Power sources with constant output for process tasks
are available as well as infinitely variable power
sources for research tasks. The modular platform provides a huge number of configurations and lighting
options with respect to the number and orientation of
light sources and the used power. For special applications an UV-enhancement option is also possible.
All light sources are equipped with a primary beam
stop. This feature allows a more uniform lighting.
Especially in combination with the imanto diffuse
lighting option, any interfering specular reflections
can be significantly prevented. Due to the small angle
of divergence the illumination beam can be applied to
a dedicated sample area and the heating of samples
and measurement setups can be reduced to a
minimum.
imanto lighting CP
imanto lighting VP
IMANTO DIFFUSE LIGHTING
Hyperspectral measurements of high specular reflecting materials like metal substrates and others require
a very homogeneous lighting for a high data quality.
Otherwise the reflection intensity superimposes the
chemical and/or color (spectral) information from
UV/VIS- and NIR-range by overexposure of the
detector.
MEASURE REFLECTING SUBSTRATES
Scientists of the Fraunhofer IWS provide an easy-touse diffuse lighting chamber for reliable hyperspectral
measurements for any kind of reflecting samples.
Made of optical PTFE, with 98 % reflection for the
whole UV/VIS and near infrared spectral range, the
imanto pro device can easily perform reliable measurements. Equipped with two imanto lighting VP units
the light intensity is adjustable to the samples needs.
In addition, each light source can be separately
switched. The designed working width of 30 cm
shows homogeneity of > 95 percent.
Beside a common version, this additional tool can also
be easily adapted to your specific interests (different
working widths, light sources etc.).
imanto lighting DC with a hyperspectral camera
imanto diffuse lighting
 material
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imanto lighting DC (inside view)
homogeneity
working width
exit slit width
size (W x H x D)
weight
optical PTFE
≥ 98 % reflection
> 95 %
30 cm
5 cm
35 x 25 x 25 cm
3 kg
IMANTO PRO
Stand-alone tasks become more and more important
for hyperspectral imaging. Therefore Fraunhofer IWS
developed a software package for research and
industrial use. In stand-alone tasks the spectroscopic
characteristics come to the fore and additional efforts
must be done for data exploration and analysis.
The imanto PRO software package offers the full
acquisition and measurement control. All spectroscopic measurement setups are supported – from
emission to transmission and several reflection setups.
In combination with the possibilities of the timeresolved (“staring imager”) and spatial-resolved
measurement modes, a very flexible software solution
is provided.
Beyond the pure data acqusition, all needed functions
for data analysis and manipulation are given.
Chemometric models for advanced data treatment
can be integrated as well. To overcome the problem
of the huge data amount and computing time,
additional libraries are integrated for highspeed
calculations.
This feature also enables the real-time application of
the software algorithms and the application of
process and quality control tasks. The data treatment
and information output can be customized to the
needed requirements.
Hardware and software demands
 Intel® Core i5 processor or better;
quad-core processor recommended
 MicrosoftTM Windows 7
 .NET Framework 4
 RAM 4 GB+
 monitor with resolution of 1366 x 768 pixel
at minimum
 optional: CameraLink interface
 optional: real-time interface
imanto PRO user interface
INTEROPERABILITY
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data format: ENVI
spectra export in single or
automatic mode, export to csv-files
easy access to picture export
SPECIAL FEATURES
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continuous measurements
on-line data processing
use of chemometric models
o SVM, PCA, LDA, QDA
•
integration of CAMO® classification engine
and Intel® MKL for ultra-fast calculations
SUPPORTED MEASUREMENT SETUPS
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emission setup
transmission setup
reflection setup
o diffuse lighting
(see imanto accessory)
o specular reflection
o microscopy setups
time-resolved measurements
o staring imager
spatially resolved measurements
o supported movement systems:
x-table, cross-table, conveyor belt
imanto MICROSCOPY
Since the spatial resolution of standard lens combinations for hyperspectral imaging systems is limited, the
scientists of the Fraunhofer IWS have developed, in
cooperation with industrial partners, a solution for the
combination of HSI and microscopy for UV/VIS as well
as the near infrared spectral range. The microscope
hardware is thereby very flexible: filters and polarizers
can be integrated into the beam path; the eye-piece
can be used in alteration with the HSI system without
any hardware change.
IMAGING MICROSCOPY
Imaging microscopy is a powerful tool to investigate
small sample structures in biological and material
science tasks. The enhancement of near infrared spectral range gives totally new possibilities for sample
characterization due to the use of chemical information of the samples. By using a high-precision x-y
motorized sample stage, the sample analysis can be
further automatized. The HSI resolving capacity is now
raised up to 200 nanometers in visual range and up to
2 microns in near infrared range.
imanto microscopy
 NIR and UV/VIS imaging in one system
 resolving capacity: < 200 nm
UV/VIS
< 2 µm
NIR
 specular reflectance and transmission
measurements
 motorized 3-axis workbench
 fourfold nosepiece
 use of standard microscope lenses
 optional: integration of filters and polarizers
IMANTO APPLICATION EXAMPLES
SORTING APPLICATIONS
SURFACE IMAGING
The main tasks for NIR sorting applications are established in the food industry and polymer sorting. The
real-time ability of the data analysis is important for
these applications. Usually chemometric data analysis
algorithms are implemented for this task. In certain
cases simpler decisions based on spectral intensity
levels can also be used. However, the data analysis
must be adapted each time to the given application
and conditions. The grabbed information can be subsequently transferred to sorting machines or other
process line machines.
NIR surface investigations are commonly found in
process and quality control application tasks. The
ability of bringing hidden features to the front helps
to evaluate the product or process step. In combination with an automated statistical analysis a clear
yes/no decision on the basis of a certain threshold
level can be done. Possible substrates can be polymers, glass, metals and others. Beside the thin film or
contamination screening (both based commonly on
chemical absorption) the surface roughness of flat
substrates and holes or gaps can also be monitored by
the analysis of the reflection intensities.
HSI based investigation of a FTO (fluorine doped tin
oxide) thin film on a glass substrate.
2 cm
Left: image of the substrate and right: visualization in near
infrared range at 1727 nm
Visualization and statistical analysis of a greasy contamination
Application of HSI for “rye and stones” – a sorting
task, which can be realized with NIR imaging
Left: NIR image of rye (red, yellow) and stones (blue) at
1247 nm, right: spectral differences between both materials
Polymer screening by means of NIR hyperspectral
imaging and chemometric data analysis
2 cm
Left: image of the steel plate and right: clear classification
(yes/no decision; orange: contamination) after NIR imaging
Investigation of OLEDs and small sample structures
Left: NIR-image of an experimental OLED-device at 1279
nm, right: control of printed “donut” polymer structures at
1379 nm (image recorded with imanto microscopy)
Left: Optical image of white polymers; middle: visualization
in near infrared (sum image) and right: differentiation by
chemometric analysis
Contact address:
Fraunhofer IWS Dresden
Winterbergstrasse 28
01277 Dresden
Germany
www.iws.fraunhofer.de/imanto
Dr. Philipp Wollmann
Phone: +49 351 83391-3316
Fax: +49 351 83391-3300
[email protected]
Dr. Wulf Grählert
Phone: +49 351 83391-3406
Fax: +49 351 83391-3300
[email protected]
Bring the information to light:
Spectral analysis by hyperspectral imaging

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