Visual engineering MKX Uživatelský manuál stáhnout pdf (Strana 6)

iVu Sensors

PresensePLUS

LENSES

LIGHTING

363More information online at bannerengineering.com

Photoelectrics

Sensors

Fiber Optic

Sensors

Special Purpose

Sensors

Measurement &

Inspection Sensors

Vision

Wireless

Lighting &

Indicators

Safety

Light Screens

Safety

Laser Scanners

Fiber Optic

Safety Systems

Safety Controllers &

Modules

Safety Two-Hand

Control Modules

Safety Interlock

Switches

Emergency Stop &

Stop Control

Working

Distance

Image Quality

A camera that captures a high quality image assures the most accurate information for

later analysis. To insure a high image quality, choose a lens that:

• Magnifies the feature of interest to fill the FOV

• Captures required FOV without adding distortion to the image

• Optimizes your FOV based on working distance

• Focuses entire scene of inspection

Resolution: The ability of a vision sensor to differentiate between two features that are

close together. If the features blur together, a higher resolution lens is required.

Distortion: The lens can influence image quality by how it collects and focuses light on

the imager chip. Different lenses have different degrees of optical distortion, or undesired

change in the shape of an image.

Depth of Field: The in-focus range of a vision system that includes the

areas which remain in focus behind and in front of the target.

The sensor’s lens focuses the reflected light onto the imager chip.

The quality of the lens will influence the quality of the image.

Lenses have one main function: To create a 2D image of the scene,

by focusing the entire field-of-view (FOV) on the imager chip.

Lens Basics

Focal Length: The distance from the lens to the camera’s imager. It is specified in

millimeters. Focal length determines the relationship between working distance

and the angle of view. Shorter focal length results in wider FOV.

Angle of View: Angle of view indicates how much of the visual scene can be

captured by the lens at a given distance.

Working Distance: The distance from the camera to the target object

under inspection.

Vision Lenses

Lens Imager

Reflected

Light

Focal

Length

Lens

Imager

Depth of Field

(focus tolerance)

Target

Resolution

25 mm Lens 4 mm Lens

Lens

Part

Focal Length

Imager

Image

Part

Image

Lens

Focal Length

Imager

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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