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OCA 30 /
OCAH 230 Video-Based Semi-Automatic Contact Angle
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Description:
Contact angle measuring device for the semi-automatic
measurement of the wetting behavior of solids, as well as for
series tests and systematic analysis. The OCA 30 enables the
reduction of subjective factors and time involved for contact
angle measurements in research, quality- and production
inspection.
Typical fields
of application:
For the software-controlled measurement and analysis of
- the static
and dynamic contact angle according to the Sessile and
Captive Drop method
- the drop
shape according to the Pendant Drop method
- the wetting
behavior on solid surfaces
- the surface
free energy of solids and their components
- the surface
and interfacial tension out of the analysis of the drop
shape
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Equipment:
The OCA 30 consists of
the basic instrument with the following technical equipment:
- Dosing bay for
installation of the optional manual syringe units and single or
multiple (max. 4, optional 6) needle support with a vertical and
horizontal fine adjustment
- Measuring stage
software controlled motorized adjustable in Y- and Z- axis
adjustable for accurate sample positioning and drop pick up from the
dosing needle, in X-axis manual adjustable
- Lens mount with
adjustable tilt
- High-performance
six-fold power zoom lens with an integrated continuous fine focus
- High-speed video
system with adapter and CCD-camera
- High-performance
video digitizing board (frame grabber) for the PC
- Halogen lighting with
continuously adjustable intensity without hysteresis for a
homogeneous back lighting
- Control and measuring
electronics with built-in digital temperature display and serial RS
232C interface
- Power supply with
automatic voltage adjustment
Features of
performance:
The 32-bit software SCA 20 developed for Windows XP/2000/NT offers by
various expansion steps:
- Control of the sample
position in Y- and Z-direction, the electronic syringe modules, the
tilting base assemblies, wafer stages and temperature control units
- Static and dynamic
contact angle measurement according to the Sessile and Captive Drop
method
- Calculation of the
surface and interfacial tension from the contours of pendant and
sessile drops as well as of liquid lamellas on plates, rods and
threads
- Calculation of the
surface free energy of solids and their components (e.g. dispersion,
polar and hydrogen bond force contribution, acid and base portions
respectively) according to the theories of Wu, Zisman, Owens-Wendt,
Extended Fowkes, Schultz 1 + 2, Fowkes, van Oss & Good
(Acid-Base), Equation of States (EOS)
- Calculation of
wetting envelopes from the surface free energy
- Statistics and
measurement error analysis
Technical Data:
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Maximum
sample size (L x W x H) |
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220 x ∞
x 70 mm, 8"-Wafer on WT 200 M/E |
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Size of
sample stage |
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100 x
100 mm |
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Position
accuracy |
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± 0.1
mm |
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Range
of contact angle measurement |
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0 …
180° ; ± 0.1° measuring accuracy of the video system |
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Range
of surface and interfacial tension |
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1·10-²
… 2·10³ mN/m; resolution: min. ± 0.05 mN/m |
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Optics |
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Six-fold
zoom lens (0.7 … 4.5-fold magnification) with integrated fine
focus (±6 mm) and high light transmitting capacity.
CCD-camera with a resolution up to 1600 x 1240 pixels (768 x 576
pixels standard)
Field of view (FOV): 1.75 x 1.4 … 11.7 x 9 mm
Optical distortion: < 0.05 % |
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Video
system |
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High-performance
image processing system with 132 MBytes/s data transfer rate
(compatible to European standard CCIR and US standard RS-170)
Up to 50 images/s digitizing speed (60 images/s with RS-170) |
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Measuring
methods |
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Sessile
and Captive Drop method
Tilting Plate/Base method
Pendant & Oscillating Drop method
Lamella method |
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Temperature
measurement and range |
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2x
Pt100 input for -60 … 450 °C (Pt100 optional), 0.1 K
resolution; 1/3 DIN IEC 751 (± 0.03 %), class B |
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Size
of device (L x W x H) |
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590 x
220 x 550 mm |
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Weight |
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20 kg |
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Power
supply |
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100 …
240 VAC; 50 … 60 Hz; 80 VA |
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Alternative/Supplementary
units and accessories |
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Manual
and electrical single dosing units; manual and electrical multiple
dosing units; manual and electrical wafer stages and tilting base
assemblies; electrical tilting base unit; liquid, peltier and
electrical temperature control units (-10 … 400 °C); suction
plate; film sample holder; optical contact angle and surface
tension standards; dosing needles; syringes; PTFE-tubes;
temperature inert glass cells; complete PC systems |
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