Laser beta lasermike LS8000-3 - Manual (Page 15)

LaserSpeed 8000-3 Instruction Handbook
System Overview
Part No. 93463 / Drawing No. 0921-01561 Page 15 of 221 Revision A (Sep 2007)
κ
Material Surface
Measurement Region
d
Resulting
Electrical Signal
with Frequency ( )
f
t
Side View
Material Movement
Top View
Fringe distance (d) is a function of laser wavelength
(
λ) and beam angle (κ): κ
λ
sin 2
=
d
Period is the inverse of frequency:
f
t
1
=
Velocity is distance divided over time:
t
d
v
=
Velocity is integrated to find Length
∫ ⋅ = T
dt v L
0