Citations
Our contact angle meters for wafer applications are recognized as benchmark tools in numerous scientific and research fields,
a testament to their frequent citation in scholarly publications.
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The following table describes the differences between the measuring process of each model

DMo model |
Positioning of first measurement | Generation of droplet | Deposition of droplet (control / recognition) | Analysis of droplet | Positioning of next measurement | Full-scale continuous measurements |
502WA | ▲ by rotary knob |
● | ▲ / ● | ● | ▲ | ▲ |
702WA | ▲ by command button |
● | ● / ● | ● | ● | ▲ |
902WA | ● | ● | ● / ● | ● | ● | ● |
▲ manual ● automatic
- Fast image capturing system with standard 400 fps at 640x480 resolution USB3.0 CMOS camera, max. 2700fps at 640x64 resolution
- Automatic single dispenser system with a set of 5 glass syringes and 5 SUS needles for precise adjustment of droplet volume and quick refilling and replacement of liquid samples
- Automatic recognition of drop deposition
- Live image display and droplet volume monitoring
- Diameter 335mm 360º rotation sample stage with a maximum load capacity of 0.4kgs
- Fine adjustable stage travel for exact positioning, travel distance: x-axis: 150mm, y-axis: fixed, z-axis: fixed
- Focusing aid with displayed index graph and value and brightness adjustment to achieve perfect focus
- Movie converter to convert data images to MPEG-1 or AVI movie format
- Determination of contact angles, droplet volume, residual droplet volume, sessile drop volume, height, and radius of the sessile drop
- Measured results are displayed in a spreadsheet for easy reference and comparison, and saved in CSV format for easy export to and manipulation in MS Excel
- User-specified analysis report function, providing measurement results and parameters
- Adjustable level of the body and stage
- Droplet calibration standard for standard view, bearing one full circle for calibration and three droplet silhouettes of 5º, 60º, and 108º for periodic inspection of measurement accuracy
Hardware
- Tilting stage for measurements of roll-off angles, incl. FAMAS software add-in [Sliding method] (except 902WA)
- Add-on module [Dynamic sliding method] to measure roll-off speed and roll-off acceleration. Only in combination with the tilting stage package (except 902WA)
- Multi-manual dispenser holder
- Multi-automatic dispenser system
- Large capacity pump dispenser, incl. a 50μl liquid container
- Surface free energy kit
- Pendant drop kit (for standard & wide view)
- Droplet calibration standard (for wide 1 view)
- Pendant drop kit (for standard & wide view)
- Kit for captive-bubble-measurements
- Pendant drop calibration standard (for standard view)
- Pendant drop calibration standard (for wide 1 and wide 2 view)
- Surface cleanliness and homogeneity after cleaning processes (typically for removal of organic contaminations)
- Surface properties such as wettability and adhesion of modified surfaces and thin film coatings
- Wetting and dewetting properties in immersion lithography processes using the sliding method with external tilting stage and/or using the extension/contraction method
DMo-902WA | DMo-702WA | DMo-502WA | |
Camera system |
USB3.0 CMOS camera with: 400fps at 640x480 pixels 500fps at 640x400 pixels 1000fps at 640x200 pixels 2700fps at 640x64 pixels |
||
Optical system |
focus: manual focus with 3-step manual zoom field of view: 6.1x4.7mm, 11.1x8.2mm, 15.8x11.8mm ±6% |
||
Measuring methods |
contact angle: sessile drop (static & dynamic), advancing/receding, tilting1) surface/interfacial tension: pendant drop (static & dynamic) |
||
Analysis methods |
contact angle: θ/2, tangent, curve fitting (ellipse, circle) surface/interfacial tension: Young-Laplace, ds/de surface free energy of solids: OWRK, Owens-Wendt, Kaelble-Uy, Kitazaki-Hata, Wu, acid-base, Zisman |
||
Measuring range |
contact angle: 0 to 180° surface/interfacial tension: 0 to 2000mN/m |
||
Resolution |
contact angle: 0.01° surface/interfacial tension: 0.01mN/m |
||
Accuracy2) |
contact angle: 0.2° surface/interfacial tension: 0.2mN/m |
||
Maximum sample surface area and height (Dia.xH) | max. 300x35mm |
||
Maximum sample weight | 400g | ||
Sample stage operation: X-axis Y-axis Z-axis Rotation axis |
150mm (aut.) --- --- 360° (aut.) |
150mm (aut.) --- --- 360° (man.) |
150mm (man.) --- --- 360° (man.) |
Dispenser operation: Z-axis Droplet deposition Droplet generation Dispensing resolution |
35mm automatic automatic 0.1μl |
35mm automatic automatic 0.1μl |
35mm manual automatic 0.1μl |
Measuring temperature | ambient | ||
Dimensions (WxDxH) of: Main instrument Control box |
375x684x432mm 290x240x100mm |
375x684x432mm 260x200x70mm |
|
Approximately weight of: Main instrument Control box |
12.5kg 4.3kg |
11.0kg 4.3kg |
10.0kg 1.6kg |
Electric power: Voltage Frequency Power consumption |
AC100-240V 50/60 Hz 115W 120VA |
AC100-240V 50/60 Hz 25W 48VA |
|
Operating environment |
temperature: +10 to +35℃, humidity: 30-80%RH (non-condensing) positioned away from sources of electrical noise and vibration |
1) An optional external tilting stage is required
2) Accuracy is the repeatability in terms of standard deviation based on the manufacturer’s calibration standard
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