Measurement of impact velocity of cladding metal by Photonic Doppler Velocimetry (PDV) ·...

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



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



5/16

Holder (support)

Probe

Scatter of the emitted laser

Optical fiber



6/16



7/16



Test the effect of changes in the angle probe installation

8/16



9/16

Spectrogram velocity measurement by PDV

Time [10-5 s]

Velo

city [

m/s

]



10/16

Time [mks]

Ve

loc

ity [

m/s

]

Time [mks]

Dis

tan

ce

[m

m]



Transformation of spectogram to graphs velocity - time and distance - time

11/16

Dis

tance [

mm

]

Velocity [m/s]



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.



13/16



An example of positioning sensors around the periphery of the base metal plate

14/16



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

Measurement of impact velocity of cladding metal by Photonic Doppler Velocimetry (PDV) ·...

Documents

Transcript of Measurement of impact velocity of cladding metal by Photonic Doppler Velocimetry (PDV) ·...