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Manual for ZBL-U5 series of Ultrasonic Detector
acoustic time value;
2)
Amplitude value A: The amplitude value of received head
wave of ultrasonic, it is used to measure the energy of
ultrasonic and the unit is dB;
3)
Acoustic velocity value V ： The transmission speed of
ultrasonic in concrete; it is a calculated value and the
calculation method is to divide spacing by T value, the unit
is km/s.
3.5.1 Terminology
1)
Dynamic sampling: It refers to the process of continuously
and
interpreting
parameter.
2)
Dynamic waveform: It refers to the continuously refreshing
waveform in single- channel waveform range on screen in
dynamic sampling.
3)
Static waveform: It refers to the static waveform in
single-channel waveform range on screen when stop
sampling.
4)
Head wave (preliminary wave): The first wave crest or
trough of waveform received by instrument.
5)
Noise range: Manual-set noise range in dynamic sampling,
it is used to distinguish waveform from noise; any
waveforms with amplitude not exceeding such range is
considered as noise.
6)
Threshold value: It is one of the automatic judging criteria
of head wave, only the waveform exceeding threshold value
repeatedly
transmitting,
and
displaying
collecting,
waveform
30
processing,
and
acoustic
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