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WHAT IS
METROLOGY & 3D MEASUREMENT?

 

Automated Optical Inspection (AOI)

 

Time-of-Flight Imaging and LIDAR Imaging

 

Laser Pattern Projection and Point Cloud Imaging

 

Scheimpflug Scanning

Metrology is the scientific study of measurements. As technology becomes more advanced, the number of ways in which measurements can be made increases as well, and with much higher accuracy and precision than ever before.

Why Metrology & 3D Measurement?

Measurement systems are used across many industries to analyze and gauge critical properties and characteristics of matter. In process control, designated characteristics such as the color, dimensions, or shape of a sample, must be measured or observed at a specified sampling rate to ensure that no significant deviations occur. These metrology systems are used to improve throughput while maintaining safe operating conditions within manufacturing facilities and operating plants and to ensure product quality is conserved.

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Optics for Metrology & 3D Measurement

Making accurate measurements optically relies on imaging systems consisting of lenses with extremely low perspective or parallax error and illumination systems that light an object of interest and its environment appropriately. Telecentric lenses are a type of imaging lens that almost completely eliminate parallax error as well as image distortion. As such, telecentric lenses typically yield the most accurate dimensional measurements of all imaging lens types. Similarly, telecentric illumination is ideal for metrology applications as it results in extremely high-edge contrast images when used as backlight.

While extremely accurate for making measurements, telecentric lenses are typically larger and heavier machine vision lenses, which may be unsuitable for harsh environments subjected to shock and vibration. To maintain high-performance precision and reliability in these environments, non-telecentric fixed focal length imaging lenses are ruggedized to resist pixel shift from shock and vibration. While telecentric lenses eliminate perspective error, these lenses do not and are used for stereoscopic imaging. For 3D measurement applications including Time-of-Flight imaging, scheimpflug scanning, and LIDAR, laser patterns projected onto the sample object are imaged by a machine vision lens and manipulated into point cloud-like data structures which provide additional context about localized height or depth.

Edmund Optics (EO) is a world class optics and photonics manufacturer with over 78 years of experience in optics, design, testing, and manufacturing. Additionally, EO offers a broad selection of versatile and off-the-shelf products, which are continuously updated to support current, relevant challenges for metrology & 3D measurements. Learn more about Edmund Optics and our World-Class Imaging Optics and Manufacturing Capabilities.

Edmund Optics’ Solutions for Metrology & 3D Measurement

Edmund Optics’ Solutions for Metrology & 3D Measurement

Technical Information and Tools

Technical Tools

Technical calculators based on commonly used and referenced equations in the Optics, Imaging and Photonics industries.

Imaging Lens Selector Tool
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Application Notes

Technical information and application examples including theoretical explanations, equations, graphical illustrations, and much more.

11 Best Practices for Better Imaging
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6 Fundamental Parameters of an Imaging System
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From Lens to Sensor: Limitations on Collecting Information
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Imaging Lens
Selection Guide
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Distortion and the
Telecentricity Specification
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Lens Selection Based
on Resolution - Advanced
Read  

Ruggedization of
Imaging Lenses
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Limitations on Resolution and Contrast: The Airy Disk
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Telecentric Design Topics
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Diffraction Limit
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Object Space Resolution
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Resolution
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Imaging Electronics 101: Understanding Camera Sensors for Machine Vision Applications
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Telecentric Illumination:
Why You Need It in Machine Vision Applications
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Imaging Electronics 101: Basics of Digital Camera Settings for Improved Imaging Results
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Resolution and
Contrast Comparison
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The Advantages of Telecentricity
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Telecentric Lens Size Control
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Published Articles

Links to technical articles appearing in industry publications authored by Edmund Optics or featuring contributions from EO's engineering team and key management.

"Vision Systems for 3D Measurement Require Care to Ensure Alignment" by Jessica Gehlhar - Industrial Photonics
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"The Importance Of Ruggedization For Imaging Lenses" by Daniel Adams - Assemblaggio & Meccatronica
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"How To Maximise The Performance Of An Imaging System" by Daniel Adams - Assemblaggio & Meccatronica
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"Lens sees clearly even through shock and vibration" by Jessica Gehlhar and Cory Boone -
Design World
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"Vision & Sensors Lens Selection Guide, Part 1" by Nick Sischka - Quality Vision & Sensors
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"Lens Selection Guide, Part 2" by Nick Sischka - Quality Vision & Sensors
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"How Smaller Pixel Sizes Impact Lens Selection" by Nick Sischka - Vision Systems Design
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Metrology & 3D Measurement System?

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