Both the working distance and the mechanical length of Core Plus lenses and illuminators have been optimised to make the system as compact as possible: compared to other telecentric lens
and illuminator systems with similar fields of view, the Core Plus series is up to 45 per cent shorter.
Also, the system should incorporate a high dynamics 3D scan head, exchangeable f-theta telecentric lens
, linear and rotary/swivel stages for realizing complex multi-axis laser processing strategies on axisymmetric, prismatic and free-form parts.
Also, the model described in this section is mainly based on the assumptions of the telecentric lens
, which cannot be applied directly to the standard perspective lens condition.
Such a 3D scanner working in micrometer range is typically equipped with a telecentric lens
having a limited Depth Of Field (DOF) at a specified working distance [WD.sub.C].
Zhang, "Design of an optical system consisting of a special telecentric lens
for side-scattering measurement on individual cells," Optical Engineering, vol.
Reference  theoretically describes the measurement errors caused by out-of-plane displacement and self-heating of the camera; it further establishes a high-accuracy two-dimensional digital image correlation (2D-DIC) system using a bilateral telecentric lens
to minimize the errors.
In the optical fringe projection system, a specially installed telecentric lens
, together with four-step phase shift method, was employed for the projection in order to retrieve accurate and real-time phase data of the deformed surface.
As usual for such sensors, it has a telecentric lens
. With such a lens, object rays are not running concentric, but approximately perpendicular to the very large lens plane and to the--relatively smaller--measuring object.
In fact, for real camera lenses, such as a fixed length lens, a zoom lens, or even an expensive high-quality telecentric lens
, image distortions unavoidably exist due to lens aberrations and misalignment of optical elements .
The TM includes a telecentric lens
for point-to-point measurements and image capture for local or network data storage.
VT-S700 uses a telecentric lens
and is said to reduce image distortion and improve inspection accuracy at the edges of large field-of-view.
For example, at the end of the white paper Will a Telecentric Lens
Optimize My Machine Vision System?