National Physical Laboratory

Optical Dimensional Standard

Optical Dimensional Standard
The NPL Optical Dimensional Standard

A single high-precision calibration artefact, bearing a vast range of different scales designed to meet virtually all optical dimensional calibration needs.

Where high precision calibration and verification of the imaging system is required, a multi-functional Optical Dimensional Standard is available, consisting of a single high-precision calibration plate bearing a vast range of different scales, designed to meet virtually all optical dimensional calibration needs. Optical instrumentation companies, vision machine and image analysis developers, system integrators and end-users can all benefit from using the NPL Optical Dimensional Standard.

The NPL Optical Dimensional Standard is a 100mm square quartz plate bearing many thousands of bright chrome structures ranging in sizes between 1µm to 60mm. There are twenty-two patterns, scaled and repeated on the glass six times enabling it to be used at different magnifications. Additionally, there are six linear scales and an X-Y stage position calibration grid. The measurement uncertainty can be as low as ±0.05μm on the linear scales and features smaller than 100μm in size.

Calibration patterns on the Optical Dimensional Standard:

Optical Dimensional Standard Calibration Patterns

General Application Areas:

  • Vision inspection systems
  • Image analysis
  • Travelling microscopes
  • Microscopy
  • Non-contact measurements
  • Particulate measurement
  • Pharmaceuticals industry
  • Micro-electronics
  • Production engineering
  • CMM with camera fitted
  • Frame-grabbers
  • CCTV cameras

Further information on the Optical Dimensional Standard and pattern dimensions Adobe Acrobat PDF file

Key features:

  • Multifunctional useThis single dimensional standard contains all the optical scales needed for high precision calibrations. The standard is supplied with a selection of customer chosen features already calibrated. Thereafter further calibrations can be provided at a later date as requirements develop.
  • Versatility
    The single calibration standard can be used over a wide range of dimensions, from 1µm linewidths to 60 mm x 60 mm 2-D areas.
  • Tailor-made functionality
    Although this standard encompasses all the previously available NPL optical standards on one plate, it also contains much more, and the tool can be calibrated to meet individual requirements. Initially, certain structures on the standard are calibrated to meet the specific needs of the customer and then additional structures can be calibrated at a later date. This makes it more economical and practical for both the customer to purchase and to have calibrated. Using Chromium makes the structures very robust and hence the scale will last a long time.


Customer Service tel: +44 20 8943 6245

Last Updated: 18 Aug 2015
Created: 5 Sep 2007


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