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What is the definition of magnification?

The enlarged view of an object by an optical instrument. Magnification allows you to see details that you cannot see with the naked eye.

Learn more about magnification in the class "Basics of the Optical Comparator 130" below.

Basics of the Optical Comparator 130

Inspection Department

Class Information

Tooling U classes are offered at the beginner, intermediate, and advanced levels.
The typical class consists of 12 to 25 lessons and typically requires at least two hours of instruction time.

Class Name	Basics of the Optical Comparator 130
Description	This class explains the principles of optical inspection and describes the optical comparator.
Prerequisites	none
Difficulty	Beginner
Number of Lessons	16

magnification

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Class Outline

Class Objectives

Objectives

What Is Optical Inspection?

Light Waves

Non-Contact Measurement

Magnification

Types of Optical Measuring Instruments

What Is the Optical Comparator?

Parts of the Optical Comparator

The Mirror System

The Viewing Screen

Charts

Types of Optical Measurements

Types of Optical Comparators

Advantages of the Optical Comparator

Disadvantages of the Optical Comparator

Summary

Define optical inspection.

Describe the properties of light waves.

Describe the benefits of non-contact measurement.

Describe the purposes of magnification.

List common optical measuring instruments.

Define the optical comparator.

Identify the parts of the optical comparator.

Describe how mirrors affect a light path.

Describe the properties of the viewing screen.

Describe the purpose of charts.

Identify the different measurements taken on the optical comparator.

Identify the different types of optical comparators.

Describe the advantages of an optical comparator.

Describe the disadvantages of an optical comparator.

Class Vocabulary

Term	Definition
angle	A figure formed at the intersection of two lines.
angle measurement	A type of measurement method that compares an unknown angle with a known angle. Many charts are available with different angle markings.
ball bearing	A rotating support containing metal balls that is placed between two parts allowing them to move easily with little friction.
caliper	A measuring device on the optical comparator that has a scale and is used to measure the length of a part.
chart	A piece of translucent paper or frosted glass that contains measurement information for comparison. Charts can quickly determine if a part fits within tolerance specifications.
collimator lens	A type of lens that produces parallel beams of light. The collimator lens projects intense light toward the part.
comparison measurement	A type of measurement method that compares an unknown measurement with a known measurement. Comparison measurement allows inspectors to accept or reject a part quickly.
contoured surface	Any curved surface or feature differing from a straight line.
direct measurement	A type of measurement method that allows an inspector or operator to use a hand-held instrument to directly measure a part feature on the optical comparator screen.
electron	A negatively charged particle that orbits the nucleus of an atom. Electrons emit energy in the form of light.
fixture	A dedicated workholding device used to locate and hold a part during machining or inspection.
ground glass	The finely grained glass material used to make a viewing screen. Ground glass produces a fine texture that provides a bright, clear image for inspection.
lamp enclosure	The part on the optical comparator that covers the light source. The lamp enclosure protects the optical comparator from heat damage.
laser	A type of instrument that emits an intense, narrow beam of light to measure part features. Laser light yields very accurate and consistent measurements.
lenses	A shaped piece of glass with two opposite curved surfaces used in an optical instrument to form an image by focusing light.
light	The energy emitted from electrons. Light is what makes vision possible.
light source	The place where light originates in an optical instrument. The light source is usually very powerful and must be protected by an enclosure.
magnification	The enlarged view of an object by an optical instrument. Magnification allows you to see details that you cannot see with the naked eye.
measuring microscope	An instrument that magnifes part features for direct measurement. The measuring microscope is much smaller than the optical comparator.
mirror	A smooth piece of glass that forms images by reflection. Mirrors are used in optical comparators to redirect light.
non-contact measurement	A measurement method that inspects a part without actually touching it. Non-contact instruments often use light to inspect a part.
optical comparator	An instrument that projects a magnified image of a part feature onto a screen for inspection. It is also known as an optical projector.
optical inspection	A method of inspection that uses sight, light, and magnification to inspect the features of a part.
optical projector	A common term for the optical comparator.
overlay chart	A type of chart made of translucent paper that contains an outline of a specific part and its dimensions. An overlay chart is placed over the viewing screen and checks if a part fits in acceptable tolerance zones.
projection magnification lens	A type of lens that magnifies an illuminated image onto the optical comparator screen. Projection magnification lenses come in a variety of different magnifications.
projector screen	Another term for a viewing screen.
radii	The distance from the center of a circle to a point on its circumference. The plural term for "radius" is "radii."
range	The limit of measurement values that an instrument is capable of reading. The dimension being measured must fit inside the range of the instrument.
screen ring	A ring consisting of markings around its edge for measuring angles. The screen ring fits around the entire viewing screen.
slide	A moving piece on the staging table that allows a part to move to different positions. Slides allow the user to position the part so its shadow falls in the correct location on the optical comparator screen.
staging table	The surface that supports the part on an optical comparator. The staging table has slides that move the part in different positions to change its view.
standard	A unit of measurement to which other units are compared. The length of a light wave is used as the ultimate standard for measurements of length.
tolerance	The unwanted but acceptable deviation from a desired dimension. Increasingly accurate dimensions require tighter tolerances.
translucent paper	A type of paper that permits the passage of light. Overlay charts are made of translucent paper.
viewing screen	A round, glass surface on the optical comparator that displays a magnified image of a part. The viewing screen is also known as a projector screen.
vision system	An instrument that uses a type of video camera to magnify part features for inspection.
watt	A measurement that describes the intensity of light or power.
wave	A shape or outline that has successive curves. Light travels in waves.

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