OCT
87
Model
5528A
Straightness
and
S
quarenes
s
Co
nsiderations
Therefore -
V' I
Ope
= m, X + bl
-.:
8.33X
- 0
.3
Ytrue
::
YLMS -
Y,lope
X
=
0.0 0.1 0.2 0.3 0.4 0.5 0
.6
0.7
0.8
0.9
YLMS =
-<>
.3
0.9 1.5 2.5 2.9 3.6 4.2 5.1 5.9 7.2
Y,t
ope
=
-<>
.3
0
.5
1.4 2.2
3.0
3.9 4.7 5.5 6.4 7.2
Yt
rue
-
0.0 0.4
0.1 0.3
-0.
1
-0
.3 -0.5
-<>.4
-<>.5
0.0 (microns)
For
Axis
2 -
Our raw data
h.
-
YLMS
::
-0.5, -1
.2,
-2
.5,
-3.8, -4.0, -4.8, -5.9, -6.2, -7,4,
-8
.8 (microns)
x
""
0.0. 0.
05
, 0.1. 0.1
5,
0.2. 0.25, 0.3, 0.35, 0.4, 0,45 (me
tre
)
Number
of points = 10
Calculations for
Axis
2 -
Total distan
ce
travelled:
AX
- 0.45
metre
Slope m2
""
.!loY
/
AX
- (-8.8-(-0.5))/(0.45-0.0)
= -18,44 micron
s/
metr
e
In
tercept
""
b2
= - 0.5 microns (at X = 0, you
want
Y'fU
II
= 0)
Therefore -
YSl
ope
= ml X + bl
""
20.67X
- 0.5
Vt
r
ue
=
YLM
S - YSlope
x = 0.0
0.05
0.1 0.15 0.2 0
.25
0
.3
0
.3
5
0.4
0.45
VLMS =
-0
.5
1
.2
-2.5 -
3.8
-4.0 -4.8 - 5.9 -6
.2
-7
.4
- 8.8
V' t
ope
=
-0
.5
-1.42 -2.34 -3.27 -4.19 - 5.1
-6
.
03
-6
.
96
-7.88 -8.8
0.0 -0
.22
-0.
16
-0.
53
0.19
0.31
0.
13
0
.7
6 0.48 0.0 (microns)
LEAST
SQUARES
FIT
METHOD
To
remove sl
ope
from yo
ur
measurement data, using
the
least
Squares
fit
Method, you should
a.
Determine both the slo
pe
(m) and t
he
int
ercep
t (b) fr
om
ca1c
ul
mi
ons
on
your raw data.
b.
Id
entify the
eq
uation of the line of your slope -
V
,lop
e =
mX
+ b,
21-3
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