1
Lesson 2
Part I
OPTICAL FLAT CONSTRUCTION
8
linear
9
From the table in foldout-8 you can deter-
mine that:
expansions
a 3 C increase in temperature causes a linear
______________of _____ micro inch in pyrex.
a 3 C temperature increase causes a _________
expansion of _____ micro inch in fused quartz.
15
perfectly
16
In addition to being round, the optical
must:
flat
be made of _______________ material.
be made of material with a _____ coefficient of
__________ ________________ .
have mating surfaces which are nearly _________
___________ .
22
23
When an optical flat is used to measure the
flatness of a gage block surface, a monochroma-
tic light source is required. The ____________
No Response Required
light will be directed toward the mating
_________________ of the gage block.
29
surfaces
30
When the reflected _______ ________ are out
flat
of phase, they interfere with each other and pro-
waves (rays)
duce dark bands (lines). The dark bands which
in
result from the interference are called
phase
_______________________ ________ .
mating
out of phase
36
interference
37
Figure 4 shows that the __________ the dis-
bands
tance between air gap surfaces, the larger num-
optical
ber of _______________ ______. When the distance
flat
between air gap surfaces is decreased, the num-
gage
ber of interference bands will be _____________
block
45
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