43 The Influence of Rod Waveguide on Acoustic Emission …
493
Fig. 43.4 The size of the rod waveguide
a. The photographof rod waveguide
b. The enlargement of sensor
Fig. 43.5 The way of sensors fixed
the waveform is shown in Fig. 43.6. At the same time, the AE signals were gathered
by sensors and the parameters of AE signals were extracted. AE signal acquisition
system parameters are shown in Table 43.2.
AE signal processing and analysis methods can be roughly divided into three
categories: single parameter analysis method, waveform analysis technology and
pattern recognition method based on multi-parameter analysis. In recent years, the
Fig. 43.6 The waveform of sending signal
Table 43.2 AE signal
acquisition system parameters
Parameter
Value
Type of acoustic AE analyzer
DS5-16C
Preamplifier (dB)
40
Peak detect time (µs)
30
Hit detect time (µs)
150
Hit lock time (µs)
300
Type of sensor
R54A
The diameter of sensor (mm)
8
The range of frequency for sensor (kHz)
Broadband
Sampling frequency (MHz)
3
Band-pass filters
Direct through
493
Fig. 43.4 The size of the rod waveguide
a. The photographof rod waveguide
b. The enlargement of sensor
Fig. 43.5 The way of sensors fixed
the waveform is shown in Fig. 43.6. At the same time, the AE signals were gathered
by sensors and the parameters of AE signals were extracted. AE signal acquisition
system parameters are shown in Table 43.2.
AE signal processing and analysis methods can be roughly divided into three
categories: single parameter analysis method, waveform analysis technology and
pattern recognition method based on multi-parameter analysis. In recent years, the
Fig. 43.6 The waveform of sending signal
Table 43.2 AE signal
acquisition system parameters
Parameter
Value
Type of acoustic AE analyzer
DS5-16C
Preamplifier (dB)
40
Peak detect time (µs)
30
Hit detect time (µs)
150
Hit lock time (µs)
300
Type of sensor
R54A
The diameter of sensor (mm)
8
The range of frequency for sensor (kHz)
Broadband
Sampling frequency (MHz)
3
Band-pass filters
Direct through