Novatest S.r.l.
Manual for Multichannel Ultrasonic Pile Integrity Tester
180
4
）
Adjust acoustic time correction value (this step is not
necessary if acoustic time initial reading has input into
instrument);
3. Calculation
1
）
Click “Process-single structural member calculation” to
calculate;
2
）
Check suspected data, manually reinterpret test points with
incorrect interpretation of the first head wave and calculate
again;
3
）
Judge according to abnormal acoustic parameters of test
point:
Acoustic speed: steady and good repeatability, data has
①
comparability.
Amplitude: sensitive to defect, but
②
effect from surface
coupling conditions is large.
Frequency: the
③
regularity between this parameter and
defect is not clear yet and only for reference.
Abnormality in acoustic parameter is not structural defect, synthetic
judgment shall be made in combination with the following factors:
Deviation of acoustic parameter compared with average
①
value;
Whether abnormality is regional;
②
Whether abnormal area has appearance defect
③
