/en/products-services/accessories /en/products-services/products

Drop Shape Analyzer


Automatic wettability and adhesion analysis of wafers and other round samples

Drop Shape Analyzer – DSA100W for wettability and adhesion on wafers

The Wafer configuration of the DSA100 Drop Shape Analyzer is geared towards the automatic, standardized quality control of wafer surfaces and other round samples. The instrument precisely determines the homogeneity of the cleaning of a surface based on the contact angle. It also enables coatings to be characterized, for example by differences in wetting of exposed and unexposed photo varnish.


  • Characterization of the cleaning and coating homogeneity of wafers

  • Adhesion evaluation between wafer and coating

  • Wetting investigation of exposed and unexposed photo varnish

  • Ideal for analyzing other round samples, e.g. hard drives or brake disks

Measuring methods

  • Contact angle of a drop on a solid surface

  • Contact angles of two drops dosed in parallel

  • Automated position-dependent contact angle measurement and evaluation

  • Contact angle using a gas bubble beneath a solid surface in a liquid

  • Surface free energy of a solid using contact angle data

  • Surface tension using the curvature of a perfectly symmetrical drop on a circular sample pedestal

  • Roll-off behavior and advancing/receding contact angle of a drop on a tilted surface

  • Carrying out a measurement up to 20 consecutive times and displaying the results together

  • Remote control of ADVANCE for integration in custom-designed, complex automations

Measuring results

  • Static contact angle

  • Advancing and receding contact angle

  • Contact angle using a bubble in a liquid

  • Surface free energy (SFE) according to the following models: Owens-Wendt-Rabel-Kaelble (OWRK), Fowkes, Extended Fowkes, Van Oss & Good (Acid-Base), Schultz, Wu, Zisman, Equation of State

  • Position-dependent contact angle and SFE

  • Temperature

Fast and automatic measurement at any position

The heart of the DSA100W is a software-controlled setup of a round rotating sample table mounted on a horizontal axis. Wafers are kept safely in position thanks to a vacuum connection. With this arrangement, every position on the wafer can be accessed quickly, automatically and accurately for measuring the contact angle.


The dosing unit produces drops with precisely adjusted volume, which guarantees exactly reproducible measuring conditions. The gentle depositing of the drop and our dynamically controlled dosing system prevent measurement deviations caused by unintentional pre-wetting.



Software-controlled analysis of the whole sample

The ADVANCE software controls the measurement automatically based on standardized measuring procedures. In doing so, positions, which have been defined and stored in advance, are approached and measured one after the other. This ensures a fast and completely standardized measuring procedure with high sample throughput.



Reliable drop shape analysis thanks to high imaging quality

The DSA100W features a high-resolution camera and a quality zoom lens for accurate display of the drop with optimum size. The high image quality that this achieves leads to a precisely measured contact angle. Combined with the intelligent image evaluation algorithm of the ADVANCE software, drop shape analysis with the instrument provides exact results.


Liquid Needle dosing

Surface free energy in seconds

With the Liquid Needle, the contact angle measurement technology is perfectly prepared for quality assurance as well as R&D. Learn more about the ideas that enable the Liquid Needle to combine speed with scientific excellence.

Dosing automation at the highest level

Equip your instrument with the optional Dosing Hub, our flexible positioning and changing system for up to three combinable dosing units. Together with software-controlled dosing solutions, the system performs automatic and fast surface free energy measurements with up to four liquids, for example. The Dosing Hub also integrates temperature-controlled dosing units and other special solutions.

Go to accessory page