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. measuring

Anotations

Scope note:

Measurement method originally used to to detect properties of electrical transmission lines; and more recently as a technique to determine dielectric water content in stone structures and in soil. It involves applying stepped voltage in pulses and observing reflected waveforms which reflect discontinuities by amplitude. The distance to the reflecting impedances is measured by the time it takes a pulse to return.