<s>
A	O
laser	B-Algorithm
surface	I-Algorithm
velocimeter	I-Algorithm
(	O
LSV	O
)	O
is	O
a	O
non-contact	O
optical	O
speed	O
sensor	O
measuring	O
velocity	O
and	O
length	O
on	O
moving	O
surfaces	O
.	O
</s>
<s>
Laser	B-Algorithm
surface	I-Algorithm
velocimeters	I-Algorithm
use	O
the	O
laser	O
Doppler	O
principle	O
to	O
evaluate	O
the	O
laser	O
light	O
scattered	O
back	O
from	O
a	O
moving	O
object	O
.	O
</s>
<s>
Laser	B-Algorithm
surface	I-Algorithm
velocimeters	I-Algorithm
work	O
according	O
to	O
the	O
so-called	O
difference	O
Doppler	O
technique	O
.	O
</s>
<s>
Laser	B-Algorithm
surface	I-Algorithm
velocimeters	I-Algorithm
work	O
in	O
the	O
so-called	O
heterodyne	O
mode	O
,	O
i.e.	O
</s>
<s>
Laser	B-Algorithm
surface	I-Algorithm
velocimeters	I-Algorithm
measure	O
speed	O
and	O
length	O
of	O
moving	O
surfaces	O
on	O
coils	O
,	O
strips	O
,	O
tubes	O
,	O
fiber	O
,	O
film	O
,	O
paper	O
,	O
foil	O
,	O
composite	O
lumber	O
,	O
or	O
almost	O
any	O
other	O
moving	O
material	O
,	O
including	O
hot	O
steel	O
.	O
</s>
