Why do you need ADSA-RealDrop? 98% drop shapes are non-axisymmetric. You can download a PowerPoint file here.

History of Contact Angle Meter— From Goniometer to modern Contact Angle Meter

In 1983, Pro. A.W.Neumann initiated a new era of modern contact Angle measurement. He Upgraded contact angle meter from goniometer to the meter meets with the application of surface chemistry by the well-known algorithm- ADSA-P. The modern fully automatic video optical contact Angle measuring instrument was developed by the A.W.Neumann team.

In 1983, Pro. A.W.Neumann initiated a new era of modern contact Angle measurement. He Upgraded contact angle meter from goniometer to the meter meets with the application of surface chemistry by the well-known algorithm- ADSA-P. The modern fully automatic video optical contact Angle measuring instrument was developed by the A.W.Neumann team.

In 1997, Professor Neumann proposed ADSA-D/ADSA-MD in ADSA technology and believed that it could test the contact angle value under the top view condition. However, due to non-axisymmetric shape, more than 98% drop shapes is actually impossible to use suitable volume as the boundary condition to  measure acceptable of contact angle value in practical application. Actually, ADSA-D only has a accuracy with 3% for measuring contact angle compared with ADSA-RealDrop method.（Reference：Axisymmetric Drop Shape Analysis: Computational Methods for the Measurement of Interfacial Properties from the Shape and Dimensions of Pendant and Sessile Drops. JOURNAL OF COLLOID AND INTERFACE SCIENCE 196, 136–147 (1997)）。

1, Chemical Diversity

2, Surface Roughness

3, Heterogeneity

1, Levelness of sample surface

2, Flatness of sample surface

The contact angle is difficult to form asymmetric drop shape with almost same left and right value of contact angle from the  side view.