Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. analysis and testing techniques
6. interferometry

Anotations

Scope note:

A technique based on the Doppler-effect for determining vibration velocity and displacement at a fixed point. It uses a two beam laser interferometer measuring the difference in frequency between a test beam and an internal reference beam.