Definition - What does Optical Tensiometry mean?
Optical tensiometry is the method of characterizing properties of material surface and interfacial interactions between liquid, solid and gas phases. The optical tensiometer is also known as contact angle goniometer and can accurately measure static and dynamic contact angles.
The drop profiles used are sessile drop, meniscus, pendant drop, reverse pendant drop, receding contact angle, advancing contact angle and captive bubble. It can also measure parameters such as contact angle, surface tension, wettability, and absorption.
Trenchlesspedia explains Optical Tensiometry
An optical tensiometer records drop images and analyzes the shape of the drop automatically. The shape of the drop is a function of the surface tension of the liquid, gravity, difference in density of the sample liquid and its surrounding medium, and the properties of the solid surface.
The image captured by the optical tensiometer is analyzed using a drop profile fitting method to determine the contact angle and surface tension.