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

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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

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

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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OZM Research Bliznovice 32, 538 62 Hrochuv Tynec, Czech Republic

Tel: +420 608 742 777 Fax: +420 469 692 882 E-mail: ozm@ozm.cz http://www.ozm.cz

THANK YOU FOR YOUR

ATTENTION

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