What is an optical comparator used for measuring?
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.
What principle does mechanical optical comparator work?
Mechanical optical comparator co. The optical comparator uses the reflection of light as its basic working principle. The optical comparator projects the magnified image of the workpiece in the display screen to compare with the standard parameter.
What is digital optical comparator?
An optical based inspection system that is capable of measuring hundreds of critical dimensions in seconds. The unit houses built in automated reporting providing operators real-time information in regards to their QA processes.
How accurate is an optical comparator?
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”.
How does optical comparator measure true position?
The two features should be sharing a centerline, in other words. This can be measured on a comparator, so long as the part is properly squared to the lens, just by finding the centers of both features and the distance between them. This assumes a comparator with a digital readout (DRO).
What is difference between mechanical and optical comparators?
Mechanical-Optical Comparators are same as the Optical comparators but the Plunger in mechanical-Optical comparator will be replaced with the Pivoted levers. The Plunger is replaced with the lever mechanism.
What are the uses of comparators?
A comparator consists of a specialized high-gain differential amplifier. They are commonly used in devices that measure and digitize analog signals, such as analog-to-digital converters (ADCs), as well as relaxation oscillators.
Which is a disadvantage of an optical comparator?
Disadvantages of Optical Comparator It is not suitable for continuous use due to the scale to be view through the eyepiece. It is suitable to use in a dark room only. Optical instruments are expensive.
Who invented the optical comparator?
The optical comparator is invented by James Hartness, president of J&L Machine Co., in 1922. It projects the shadow of an object onto a screen a few feet away and can be compared with a chart showing tolerance levels for the part.
How do you calibrate an optical comparator?
The correct way to calibrate the screen with a master glass scale on the stage, magnify it on the screen and measure the image projected by another glass reading scale. If an overlay is not used or magnified, the image on the screen is never measured. In this case, the magnified accuracy should not be a problem.
What is used with an optical comparator to measure angled features?
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.
How do I calibrate my optical comparator?
What type of circuit do comparators use?
A comparator is an electronic circuit, which compares the two inputs that are applied to it and produces an output. The output value of the comparator indicates which of the inputs is greater or lesser. Please note that comparator falls under non-linear applications of ICs.
Which one of the following is the advantages of optical comparator?
Following are the 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.
What are the advantages of comparator?
Advantages of Mechanical-Optical Comparators : 1. They have a less number of mechanical moving parts, hence less friction and inertia effect, and gives higher accuracy 2. The scale can be made to move past a datum line and thus have high range and no palallax.
How do you measure the radius of a profile projector?
How to Measure a Radius/Diameter. Place the object to be measured on the screen and adjust the height of the table to focus. Next, align the centre point of the circle on the projected image with the point where the screen reference line is public.
What is an optical comparator and how is it used?
The lever acts as the plunger.
How to use an op amp as a comparator circuit?
These op amp comparator circuits are typically used in applications where low performance is acceptable.
How to calibrate optical comparator?
Calibration of the X-Axis and Y-Axis scales involves comparing the scale readout with a length standard. Test points should be taken every 1 inch across the measuring range of Optical Comparator for each axis. The measured value on the scale readout should be within the stated manufacturer’s specifications.
Can I use a comparator without implementing comparable?
You don’t use Comparable. You use Comparator. Comparable is an interface implemented by objects to specify their sort order with other objects of the same type. Comparator is a generic interface that simply takes two objects and tells you their sort order. So you can do: