Model
5528A
First
look
10
7
51
AIR
SENSOR AND
107
57
MATERIAL
TEMPERATURE
SENSOR
To
appre
ci
ale why the
se
se
n
so
rs are used,
yo
u should hil
ve
so
me understanding of
how
the
characte
ri
stics
of
the air and
yo
ur
material
ca
n affect yo
ur
meas
urement
s.
See
Section 6
("
DISTANCE MEASUREMENTS") for more-detailed
information
aboutlhese
se
n
so
r
s.
Why
Measure
Air Te
mperature,
Pressure,
or
Humidity?
The wavelength
of
the light produ
ce
d by the laser
is
used as
Ihe
scale
for
di
sta
nce and vel
oci
ty
measurement
s.
(The other measurements are "
differential"
measurements -
see
Appendix
A
for
detail
s.
)
The wavelength (in air) of
any
light depends
on
the
ve
locity
of
lighlthrough
air. This,
in
turn
,
depends
on
I he lemperature, press
ur
e,
and (
to
a l
esser
extent) relative
humidity
. For example, air
that
is
les
s
den
se (as
in
the
case
of
low pre
ss
ure, high-temperature air) results in a higher velocity
of
light and a longer light wavelength.
The Measurement Display unit multiplies the
number
of
wavelengths it counts (from the Laser
Head) by a
ca
libration fact or that includes Ihe
ca
lculated
ve
l
ocity-of-light
compensaTion, thereby
correcting
for
any difference between the
"c
urrent
"
ve
locit
y
of
light
(In air) and the velocity
of
light in a vacuum.
Why
Measure
Material
Temperature?
Th
e most signiri
ca
nt
so
ur
ce
of
error in
ma
c
hin
e tool
di
stance meas
urement
s
is
the effect
of
temperature on Ihe
ma
chine
1001.
By
co
mpen
sa
ting
for
material temper
atur
e, you adjust the
actual measurement
va
lue to what the measurement value
would
be
at the standard material
temperature of 20°C (
68°F
)· . This
wi
ll allow you to compare measurements made at
different
temperature
s.
How
are
Air
and
Material Characteristics
Input
to
the
Measurement
Display Unit?
Th
ese
c
ha
racteristics
can
be entered manually
or
automat
ic
all
y.
Attaching the sensors will en
ab
le
autornatic
input
of
the
da
t
a;
otherwise,
yo
u must
determine
the
correct
ca
librat
ion
numbers and
enter them
manually. Instructions for
inputting
air and m<lterial
co
mpensation factors
ar
e
provided in Section 6
("
DISTANCE MEASUREMENTS
")
of
this User
's
Guide.
'T
hi~
w;n
established
in
"
im~
on
1
93
1 by Ihf! 'nlf'rnal
io
nal
Commilh~c
Oil
WCllShl
~a
nd Mf'amle~
'
IC
I
'M
I.
Sec
ANSI 869.6.2-
1
973.
"I
Cll1pe
r~l
u
r
c
/.
I tumidity
(nvlronment
lor
Dllncn
~io
n~1
Metrotogy
".
page
6.
2-11
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