measurement of impact velocity of cladding metal by photonic doppler velocimetry (pdv) ·...
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Measurement of impact velocity
of cladding metal by Photonic
Doppler Velocimetry (PDV)
P. Nesvadba
J. Kucera
M. Kunzel
J. Pachman
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Problems:
• Measurement of impact velocity during the
welding process by PDV
• Development of methodology for determination
of impact velocity
• Construction of the equipment for commercial
using
• Offer of the compact instruments
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vc
vp
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Measurement of the impact velocity vp
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Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
PDV is a laser interferometric technique for measuring velocities of moving
surfaces up to tens of kilometers per second. 4/16
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Laser, amplifier, 4-channel PDV
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
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Holder (support)
Probe
Scatter of the emitted laser
Optical fiber
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
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Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
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Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Test the effect of changes in the angle probe installation
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Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
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Spectrogram velocity measurement by PDV
Time [10-5 s]
Velo
city [
m/s
]
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
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Time [mks]
Ve
loc
ity [
m/s
]
Time [mks]
Dis
tan
ce
[m
m]
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Transformation of spectogram to graphs velocity - time and distance - time
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Dis
tance [
mm
]
Velocity [m/s]
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Transformation of the data to graph distance - velocity 12/16
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Time [mks]
Dis
tan
ce
[m
m]
Comparison of the impact velocity for two type explosive by acceleration
of Cu plate 2.0 mm thickness.
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
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Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
An example of positioning sensors around the periphery of the base metal plate
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Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Conclusion:
• PDV instruments is suitable method for measurement of
impact velocity during the welding process.
• They were found appropriate procedures for practical
application of measurement by PDV.
• For customers it is possible to offer the compact
instruments.
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