14
transducer distance
3.3
Measurement Arrangements
3.3.1
Terms and Definitions
Diagonal arrangement
The transducers are mounted on the opposite sides of the pipe (see Fig. 3.5).
Reflection arrangement
The transducers are mounted on the same side of the pipe (see Fig. 3.6).
Fig. 3.5: Diagonal arrangement
Fig. 3.6: Reflection arrangement
Sound path
The distance covered by the ultrasonic signal after crossing the pipe once. The number of the sound paths is:
• odd if the measurement is conducted in the diagonal arrangement (see Fig. 3.5)
• even if the measurement is conducted in the reflection arrangement (see Fig. 3.6).
Transducer distance
Distance between the transducers. It is measured between the inner edges of the transducers.
reflection arrangement
diagonal arrangement
(positive transducer distance)
diagonal arrangement
(negative transducer distance)
transducer distance
transducer distance
