HDV500 Manual

T

telecentric

A lens property where the light from the object stays parallel to the optical axis across the entire field of view, thereby eliminating optical distortion. This can only happen if the entrance aperture of the lens is larger than the field of view, requiring a large and expensive lens.

Object

Telecentric lens

Sensor

telecentric illumination

Using optics to direct light from an LED onto an object under inspection, producing a high contrast silhouette. Telecentric illumination increases edge contrast and measurement accuracy by decreasing diffuse reflections from the object. See the following figure.

V

VED

See video edge detection.

video edge detection (VED)

A system where a video camera and digital image processing are used to detect edges or other features.

Z

zoom optics

Optics which can change magnification based on a user selection. Zoom control can be manual or motorized, depending on the metrology system.

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