• Measurements in depressions of well plates.
• Measurement between electronic components on populated boards.
• Measurement on concave optical lenses.
• Surface investigations for the interior of tubes and hoses.

• Contact angle measurement using the top view distance method.
• Special contact angle method for measuring in recesses.
• Surface free energy determination from contact angles of several test liquids using common models.
• High resolution for small contact angles.
• Easy measurements in patterns such as well plates.
• Available as a stand-alone instrument or as a measuring head module for DSA100, DSA30, or DSA25.

The Top View Analyzer – TVA100B is unique in using the top view distance method for measuring the contact angle of a liquid on a solid from above. This method is ideal for measurements in depressions and on concave surfaces where conventional side view analysis is not possible.

The method involves determining the curvature of a drop's surface, which correlates with the contact angle, from the distance of reflected light spots in a video image. These spots are created by LEDs positioned above the drop. The calculation requires variables such as working distance, LED spacing, optical enlargement, and dosed drop volume.

• Camera System: USB 3.0 connection, up to 2300 fps.
• Optics: 6.5× zoom, manual.
• Illumination: LED, adjustable.
• Dosing System: Electronic pipette for precise drop generation with a resolution of 0.01 µL, minimum drop volume of 0.2 µL, and capacity of 10 µL.
• Contact Angle: Range from 3.5° to 75°, with accuracy of ±0.1° (3.5° to 23°) and ±1° (23° to 75°).

The TVA100B features high-quality optics and a high-resolution camera for precise measurement of point distances. The drop volume is dosed with precision, allowing for quick changes of the liquid to determine the surface free energy of the sample.