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ACA 50
Automatic Contact Angle Meter
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Description:
Contact angle measuring device for the fully automatic
measurement of the wetting behavior of solids (e.g. wafers or
glass substrates for flat panel displays) under clean-room
conditions, as well as for series tests and systematic analysis.
The ACA 50 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 analysis
of 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 ACA 50 consists of
the basic instrument with the following technical equipment:
- Single needle support
or optional a multiple needle support (max. 6 dosing needles and
electronic syringe units) with fully automatic needle selection and
vertical and horizontal positioning
- Measuring stage,
fully automatic adjustable in three axis for accurate sample
positioning
- Lens mount with
motorized adjustable tilt (± 5°)
- Motorized powerful
7-fold zoom lens with software controlled magnification, aperture
and focus
- Video measuring
system with high-resolution CCD-camera
- High-performance
video digitizing board (frame grabber) for the PC
- Illumination with
continuously adjustable intensity for a homogeneous back lighting
- Control and measuring
electronics for the teach-in procedure, graphic display with
keyboard and video display
- Power supply with
automatic voltage adjustment
Features of
performance:
The 32-bit software SCA
50 developed for Windows 2000/XP offers by various expansion steps:
- Control of the sample
position in X-, Y- and Z-direction, the needle selection and
position in Y- and Z-direction, the measuring lens with adjustment
of zoom, focus and aperture, the electronic syringe modules, the
tilting base assemblies, wafer stages and temperature control units
- Development,
administration and up- and download of control programs
- 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 and van Oss & Good
- Statistics and
measurement error analysis
Technical Data:
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Maximum
sample size (L x W x H) |
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320 x ∞
x 70 mm, 12"-Wafer on WT 300 M/E with 0.5x front lens |
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Maximum
sample weight |
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3kg |
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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 in the sample level; 5 µm vertical to the sample
level |
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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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Motorized
powerful 7-fold zoom lens (0.75 … 5.25-fold magnification)
with integrated software controlled magnification, aperture and
focus
CCD-camera with a resolution of max. 752 x 582 pixels
Field of view (FOV): 1.2 x 0.9 … 8.5 x 6.4 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 |
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Measuring
methods |
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Sessile
and Captive Drop method
Tilting Plate method
Pendant Drop method
Optical Wilhelmy Plate and Rod/Thread method |
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Size
of device (L x W x H) |
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830 x
330 x 450 mm |
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Weight |
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35 kg |
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Power
supply |
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100 …
240 VAC; 50 … 60 Hz; 55 VA |
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Clean-room
classification |
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100 |
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Alternative/Supplementary
units and accessories |
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Single
dosing unit; multiple dosing unit; manual and electronic wafer
stages and tilting base assemblies; liquid, peltier and electrical
temperature control units (-10° …
350°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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