What are the non contact optical inspection methods?
Noncontact inspection systems include laser micrometers, vision measuring machines, profile projectors and microscopes. All these instruments allow measuring small work pieces without touching them. Let’s look at these instruments separately to get a better understanding of how they work.
What are optical inspection methods?
Optical inspection is an enhancement to simple visual inspection performed with the naked eye because it involves the use of lenses to improve or enhance the image of an object so an accurate evaluation can be made about some characteristic or attribute of the object.
What are the advantages of non contact inspection?
The advantages of noncontact scanners over contact devices include fast data collection, and more comprehensive collection of points means a clearer view of the entire part. They are (except for CT scanners) highly portable and flexible to use, with no or very few compensations for the data being collected.
Which type of probe system is used in CMM?
The touch trigger probe is the most common type of probe used on CMMs today. Touch trigger probes are precision-built, touch-sensitive devices that generate an electronic signal each time the probe contacts a point on the work piece.
Which is non-contact type 3D scanner?
Non-contact 3D measurement technologies, as the name suggests, provide a means to collect 3D data without touching objects. They include 3D laser scanners, structured light scanners, photogrammetry solutions and optical CMM scanners.
What is another name of Computer Aided Inspection?
What is another name of computer aided inspection? Explanation: Machine vision is a technique which allows a sensor to view a scene and derive a decision logically without further human intervention. Advantages of machine vision systems are consistency, high speed and reliability.
What is Aoi in PCB manufacturing?
AOI is an automated visual inspection methodology used primarily to test for defects in printed circuit board assemblies (PCBAs). AOI autonomously scans PCBAs with cameras and detects two types of failures: 1. catastrophic failures, such as missing components, and 2.
What is Aoi in manufacturing?
Automated optical inspection (AOI) is an automated visual inspection of printed circuit board manufacture where a camera autonomously scans the device under test for both catastrophic failure (e.g. missing component) and quality defects (e.g. fillet size or shape or component skew).
What is the disadvantage of contact-type scanner?
1) Accuracy. This is a compromise between accuracy and speed. If the software algorithm is strong enough, lack of accuracy can be made up. However, the degree of remedy is limited by the human eye (can’t see difference from human eye).
How are non-contact inspection techniques different from contact inspection?
11.3.2 Non-contact Inspection Techniques Non-contact inspection techniques use sensors instead of a mechanized probe favoured by contact inspection methodologies. The sensor is located at a certain distance from the object to be inspected, to measure or gauge the desired features of the object. KEYPOINT
How are noncontact measurements used in industrial inspection?
The noncontact solutions are a relatively new approach in a time-honored discipline. They range across laser scanners, structured light scanners and industrial CT scanners. All of them capture the “shape” of the part so that measurements can be made and analyzed using inspection software.
How is non-contact inspection of internal threads of machined parts?
The second technique is based on image processing and uses innovative machine vision; a line-scan technique which uses a CCD camera with a “sight pipe” panoramic optical device. The two methods are complementary; together they allow the practical inspection of all needed features of the internal thread. The methods were tested successfully.
What are the different types of inspection techniques?
There are two types of inspection techniques – contact and non-contact. See Figure 11.1. KEYPOINT There are two types of inspection techniques: contact and non-contact. END KEYPOINT Figure 11.1: Contact and non-contact inspection 11.3.1 Contact Inspection Techniques
