Vision sensors are a direct source of information for the entire machine vision system, consisting primarily of one or two graphic sensors, sometimes with light projectors and other ancillary equipment.
The main function of the vision sensor is to obtain enough of the original image to be processed by the machine vision system.
Image sensors can use laser scanners, line and area array CCD cameras or TV cameras, or the latest digital cameras.
A visual sensor refers to an instrument that acquires image information of an external environment using an optical element and an imaging device, and generally describes the performance of the visual sensor with image resolution.
The accuracy of the vision sensor is not only related to the resolution, but also to the detection distance of the object being measured.
The farther the object is measured, the worse its absolute positional accuracy.
The basic principle of visual sensor
Vision sensors have thousands of pixels that capture light from a single image.
The clarity and detail of the image is usually measured in resolution and is expressed in number of pixels.
Some of the vision sensors provided by Banner Engineering can capture 1.3 million pixels.
Therefore, the sensor can “see” a very delicate target image no matter how many meters or centimeters away from the target.
After capturing the image, the vision sensor compares it to the reference image stored in memory for analysis.
For example, if the vision sensor is set to identify a machine component that is correctly inserted with eight bolts, the sensor knows that the component with only seven bolts, or the component with the bolt misalignment, should be rejected.
In addition, the visual sensor can make a judgment no matter where the machine component is located in the field of view, whether or not the component is rotated within 360 degrees.
Vision sensor application area
The low cost and ease of use of vision sensors have attracted machine designers and process engineers to integrate them into applications that have relied on manual, multiple photoelectric sensors, or not test at all.
Industrial applications of vision sensors include inspection, metrology, measurement, orientation, flaw detection and bifurcation.
The following are just some application examples:
At the car assembly plant, inspect whether the beads coated by the robot to the door frame are continuous and have the correct width.
In the bottling plant, inspect whether the cap is properly sealed, whether the filling level is correct, and enre that no foreign matter has fallen into the bottle before the capping.
On the packaging line, make sure the correct packaging label is in the correct position.
In the pharmaceutical packaging line, check for ruptured or missing tablets in the blister pack of aspirin tablets.
In metal stamping companies, stamping parts are inspected at speeds of more than 150 per minute, 13 times faster than manual inspection.