7-11.
If the temperature of a black body
is increased 10 times, the IR
radiation will be increased what
number of times?
1.
100
2.
1,000
3.
10,000
4.
100,000
7-12.
All materials commonly used in
visible light optics are
transparent at IR frequencies.
1.
True
2.
False
7-13.
Which of the following qualities is
desired in optical material used In
IR
1.
2.
3.
4.
imaging systems?
Transparent to visible light
High coefficient of thermal
expansion
Low mechanical strength
High surface hardness
7-14.
What optical materials, if any,
have all of the qualities desired
in IR optics?
1.
Silicon, germanium, and zinc
selenide
2.
Silicon, germanium, and zinc
sulfide
3.
Silicon, zinc selenide, and
zinc sulfide
4.
None
7-15.
What component in the JR imaging
system is the most important?
1.
Detector
2.
Optic
3. Receiver
4.
Sensor
7-16.
A photographic film is an example
of what type of detector?
1.
Elemental
2.
Imaging
3.
Photon
4.
Thermal
7-17.
What type of energy-matter
interaction involves the absorption
of
1.
2.
3.
4.
radiant energy in the detector?
Thermal effect
Photon effect
Elemental
Imaging
IN ANSWERING QUESTIONS 7-18 THROUGH 7-21,
SELECT THE DESCRIPTION FROM COLUMN B THAT
MATCHES THE TERM LISTED IN COLUMN A.
A. TERM
B.
DESCRIPTION
7-18.
Photon effect
1.
Radiation
causes
7-19.
Photoconductivity
photocathode
surface
7-20.
Photoelectric
electron
emission
7-21.
Photoemissive
to the
surrounding
space
2.
Radiant
energy
photons
interact
directly
with
detector
material
3.
Radiant
energy
changes
detector
material’s
electrical
conduction
4.
Radiant
signal
causes a
difference
of
potential
across a PN
junction
46
