Convex eyeglass lens inspection

Broadening the Abilities of the Surface Analyst

The Surface Analyst™ has the unique ability to measure on almost any surface: vertical, horizontal, smooth, rough, mirrored and in an easy, accurate, fast, and non-destructive way. However, until now, measuring on concave and convex surfaces presented an obstacle. Now BTG Labs’ Surface Analyst boasts a new specialized head for measuring on concave and convex surfaces.

Before, the only way to measure on these surfaces was with a benchtop goniometer which can only measure on flat or convex materials. Goniometers measure contact angle from a horizontal view. However, a concave material prevents visual of the horizon line needed to determine the contact angle. The closest one could get to measuring a concave surface was to use a flat coupon of the same material. While this would offer insight to the surface energy of the material, it would not be exact because it would not be the actual concave part, thus allowing for guesswork.

Discovering New Applications for Contact Angle Measurements

Several industries require measurements on these concave and convex surfaces including optical lenses, packaging cylinders, automobile headlights, and even the inside of tank cannons. This new head attachment can also measure on curved sections and cylindrical parts. Many of these parts require surface preparation for bonding, coating, sealing, painting, and printing.

Automobile headlights, for example, obtain a hydrophilic interior coating to prevent condensation build up. Optical eye lenses often use special coatings to protect the lens from scratching, reflection, or glares. Measuring the surface of these materials prior to adhesion leads to the success of bonds, paint, print, or coatings.

BTG Labs works continually to expand the abilities of the Surface Analyst. See the new demonstration video of the Surface Analyst’s measurements on concave and convex lenses.