An optical comparator is a measurement tool used to inspect and measure the dimensions of small manufactured parts. Images of the part are magnified using illumination sources, lenses and mirrors to make the 2-D measurement. ... The simplest way is to have an instrument over the silhouette of the image.
What can an optical comparator measure?
It can measure angles, radii, lengths and widths. One of the most effective ways to measure small radii--an inherently difficult measurement to make on any inspection system--is by using a chart gage on an optical comparator.
What is an optical comparator an optical comparator is an instrument that?
An optical comparator is an instrument that projects a greatly magnified image of a part feature onto a screen for examination. It is used to compare the shape, size, and location of its features against prescribed limits.
How accurate is an optical comparator?
The dimensional capabilities of an optical comparator are 2D and 2 ½D for that of a vision system. As stated before, the accuracy of an optical comparator is approximately 0.0005” while a vision systems capabilities are double that at approximately 0.0002”.
What does optical comparator measure?
An optical comparator is a measurement tool used to inspect and measure the dimensions of small manufactured parts. Images of the part are magnified using illumination sources, lenses and mirrors to make the 2-D measurement.
How do you use an optical comparator?
Optical comparators are a type of optical measuring instrument. The measurement principle is similar to that of optical microscopes. The target is placed on the stage, and a light is shined on the target from underneath. This causes the target's profile, or shadow, to be projected on the screen.
Can a comparator be used for measurement?
A device that compares the unknown length with the standard. Such measurement is known as comparison measurement and the instrument, which provides such a comparison, is known as Comparator. Comparators are generally used for linear measurements.
How do you measure an angle with optical comparator?
There is a method of checking by putting a sheet called "chart" with fine scale like a protractor on the screen. On an optical comparator with a calculation function, the angle is calculated by specifying two straight lines.
Why the accuracy of optical comparator is more than mechanical comparator?
Advantages of Optical Comparators High accuracy will be achieved since it is having very less moving parts. Parallax error will be avoided. Less weight compared to other comparators due to fewer parts.Jan 28, 2018
Which comparator is more accurate?
The dial indicator or the dial gauge is one of the simplest and the most widely used Mechanical comparator. Electronic gauges are more accurate and reliable than mechanical, which has made them the preferred choice in many applications.
What are the advantages of optical comparators?
Advantages of Optical Comparator High accuracy will be achieved as it has very few moving parts. Less weight than other comparators because of fewer parts. The parallax error will be avoided. Due to the high magnification, very suitable for accurate measurement can be obtained.May 13, 2020
What are the advantages of comparators?
Advantages of Electrical Comparator: Vibrations are reduced due to least weight of mechanical. It consists of less moving parts. By AC supply the friction errors are reduced. For measuring units the indicating instrument can be held at remote locations.Oct 28, 2018