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Optical Measurement Methods

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Definition: Optical measurement methods are non-contact measurement techniques for capturing the geometric, topographic or deformation properties of a workpiece. They use light as the carrier of information, e.g. lasers, white light or camera systems. The aim is precise and rapid data acquisition without mechanical contact.

Practical relevance: The methods include 3D laser scanning, fringe projection, white-light interferometry and digital image correlation (DIC). They are suitable for sensitive surfaces, complex free-form geometries and dynamic measurement tasks. Dimensional deviations, surface parameters or strains are evaluated. Influencing factors are surface reflection, calibration and ambient conditions.

Decision-making perspectives:

  • Technical decision-makers: Selection of suitable systems for rapid inline or laboratory testing.
  • Purchasing/project management: Assessment of investment costs, accuracy and integration capability.
  • Science: Analysis of measurement uncertainties and comparison with tactile methods.
  • Insurance/law: Documented geometry verification without component damage.

Typical testing or verification methods: 3D scan, fringe projection, white-light interferometry, digital image correlation.

FAQ:

  • When are optical measurement methods advantageous?
  • With sensitive surfaces, complex geometries or when rapid, non-contact measurement is required.
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