Ultrasound

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Ultrasound

• presented
• by BAM

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Equipment BAM

• Power supply
• Waveform generator (any arbitrary of pulse forms)
• Power Amplifier
• Oscilloscope
• Computer

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Measurements Overview
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Measurement - Historic Masonry

• Kirche am Anger
• Potsdam-Babelsberg
• Brandenburg / Germany

Year of construction 1850-52 By Ch. H. Ziller
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Transducers
A1220 array with transversal transducers (no
coupling agent required)
12 Transmitters

Polarisation of waves
12 Receivers
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Result measurement Historic Masonry
Position cm
4 8 12 16 20 40
60 80
100
0
Represents the depth of 118 mm
100
200
Depth mm
300
400
500
600
700
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Measurements Overview
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Specimen Brickwork 25 cm
Specimen Homogeneous brickwork Used for
Selection of optimal transducers
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Transducers A1220
A1220 array with transversal transducers (no
coupling agent required)
12 Transmitter

Polarisation of waves
12 Receiver
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Results
Only the first row of bricks was detectable with
the A1220 The system seems not to be suitable
for masonry investigation
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Measurements Overview
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Specimen Brickwork 25 cm
Specimen Homogeneous brickwork Used for
Selection of optimal transducers
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Transducers planar and exponential
Broad band (planar) transducer (coupling agent
glycerine) G 0,1 R and G 0,2 R nominal
Frequency 80 to 250 kHz
Narrow band transducer (point contact,
exponential horn) nominal Frequency 50 and 100
kHz
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Results specimen 25cm (G 0,2 GC)
Intensity a.u.
t
Time µs
Intensity a.u.
t
Time µs
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Measurements Overview
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Specimen Brickwork 49 cm
Measuring line 0-70cm
Specimen Brickwork with voids used for tomography
Location of voids
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Transducers planar and exponential
Broad band (planar) transducer (coupling agent
glycerine) G 0,1 R and G 0,2 R nominal
Frequency 80 to 250 kHz
Narrow band transducer (point contact,
exponential horn) nominal Frequency 50 and 100
kHz
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Aperture Angle

• Intensity of transmitted signal related to the
  aperture angle
• (Broad band transducer)

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Measurements Overview
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Measurements tomography 1
Intensity a.u.
t
Time µs

• DATA FOR TOMOGRAPHY
• Measurement time of flight
• (Broad band transducer G0,2R)
• Signal No 3 and 32

Intensity a.u.
t
Time µs
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Measurements tomography 2
Intensity a.u.
t
Time µs

• DATA FOR TOMOGRAPHY
• Measurement time of flight
• (Narrow band transducer
• exponential horn)
• Signal No 1 and 21

Intensity a.u.
t(?)
Time µs
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The END
BAM at work