<title>Telecentric lens for precision machine vision</title>

A novel image analysis technique for 2D characterization of overlapping needle-like crystals

“…The imaging equipment used to acquire grayscale images of the L-glutamic acid crystals is shown in Figure 1. A Basler ace acA2440-20gm Monochrome GigE Camera (Basler AG, Germany) with 3.45 × 3.45 µm pixel size and 8.4 × 7.4 mm sensor size, was attached to a 4.0X SilverTL Telecentric Lens, which in contrast to a normal lens minimizes distortion [47]. The camera in combination with the 4x magnification lens allows each pixel to represent 0.8625 × 0.8625 µm of the real world and decreases the field of view to a size of 2.1 × 1.7 mm.…”

Design of a double-sided telecentric zoom lens

“…(18) for individual elements of the optical system. If the condition 1 < M − 0.86N 2 < 2.76 is fulfilled, then the optical element can be realized as a simple lens [25,26].…”