measurement of impact velocity of cladding metal by photonic doppler velocimetry (pdv) ·...
TRANSCRIPT
Measurement of impact velocity
of cladding metal by Photonic
Doppler Velocimetry (PDV)
P. Nesvadba
J. Kucera
M. Kunzel
J. Pachman
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
2/16
vc
vp
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Measurement of the impact velocity vp
3/16
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
Laser, amplifier, 4-channel PDV
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
5/16
Holder (support)
Probe
Scatter of the emitted laser
Optical fiber
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
6/16
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
7/16
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
Test the effect of changes in the angle probe installation
8/16
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
9/16
Spectrogram velocity measurement by PDV
Time [10-5 s]
Velo
city [
m/s
]
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
10/16
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
11/16
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
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
13/16
Measurement of impact velocity of cladding metal
by Photonic Doppler Velocimetry
An example of positioning sensors around the periphery of the base metal plate
14/16
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.
15/16
OZM Research Bliznovice 32, 538 62 Hrochuv Tynec, Czech Republic
Tel: +420 608 742 777 Fax: +420 469 692 882 E-mail: [email protected] http://www.ozm.cz
THANK YOU FOR YOUR
ATTENTION
16/16