Bilateral Telecentricity: A Precondition For High-Precision Optical Metrology

By Dr. Rolf Wartmann, Bad Kreuznach

In the realm of noncontact optical metrology, the rapid advancement of techniques owes much to the integration of electronic image processing, enabling automated processes. Central to this progress are object-side telecentric lenses, pivotal for ensuring consistent imaging regardless of object distance, a critical aspect for precise measurements. However, while the focus has predominantly been on object-side telecentricity, the role of image-side telecentricity has been overlooked, despite its equal importance.

In this context, understanding the concept of bilateral telecentricity is vital. Bilateral telecentric lenses, designed to maintain telecentricity not only on the object side but also on the image side, offer a solution to the challenges posed by asymmetrical edge images resulting from defocusing.

This article delves into the fundamental principles of bilateral telecentricity and its significance in achieving high-precision optical metrology, as well as the advantages of Schneider Optics' series of bilaterally telecentric measurement lenses, poised to meet the escalating demands for accuracy in non-contact measurement systems.