Visual engineering MKX Instrukcja Użytkownika Pobierz pdf (Strona 3)

VISION

iVu Sensors PresencePLUS SENSORS LENSES LIGHTING

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Vision Sensors

Vision sensing is electronic imaging, applied in a manufacturing setting for the

purpose of control. Process, machine, robotic and quality control are typical

applications on the plant floor. Vision is comprised of two major elements:

A hardware element (camera, controller and lighting) and a software element

(control system, image algorithms and graphical user interface).

Inspection

“Visual inspection” refers to the process of acquiring an image, analyzing that

image based on set parameters and reporting the results. A digital camera

captures images and the sensor software analyzes the images using vision tools

to pass or fail the product.

Vision tools are specific software algorithms used to analyze an image. Each

vision sensor uses a specific tool set to extract and isolate certain features within

the image in order to determine whether a part passes or fails an inspection.

Process

Visual inspection is a three-step process:

1. The sensor acquires an image of the part.

2. The microprocessor analyzes the image.

3. The microprocessor determines if the inspection passes or fails

based on a set of parts, and reports the results to the manufacturing

line. The part is then either passed to the next process, or it is

rejected and removed.

Part

Light

Source

Imager

Output

Results

Lens

Process the image

make a decision

ACQUIRE ANALYZE

DETERMINE

SENSOR

2. Lens: The lens focuses the light onto the sensor’s imager. The main

consideration for selecting a lens is focal length. To determine the focal

length, the field-of-view and working distance must be determined. The

field-of-view is the area of the inspection captured on the sensor’s imager.

The working distance is the distance between the back of the lens and the

target object.

3. Sensor: The sensor contains the imager, microprocessors and I/O.

The imager has an array of tiny light-sensitive cells that converts the

target into an image.

Microprocessors analyze the image and make determinations about it

based on user-determined tolerances and criteria.

The sensor exports the inspection results through some type of I/O

(example, Discrete or Ethernet).

Horizontal

FOV

Vertical

FOV

Horizontal

FOV

Working

Distance

Vertical

FOV

Field of View and Working Distance

Parts

1. Light Source: The light source is a critical component of any vision inspection system. Lighting is the most powerful tool for creating contrast to amplify the feature

of interest, while minimizing other features of the part. Selecting the best light source depends on the shape, surface texture, color and opacity of the part.

PROXIMITY MODE

Backlight Ring Dome Directional Low-angle On-axis

OPPOSED MODE

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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