All RF Cafe quizzes would make perfect fodder for employment interviews for technicians or engineers
- particularly those who are fresh out of school or are relatively new to the work world. Come to
think of it, they would make equally excellent study material for the same persons who are going to
be interviewed for a job.
Some of these books used in quizzes are available as prizes
in the monthly RF Cafe Giveaway.
Note: Many answers contain passages quoted in whole or in part from the text.
quiz is based on the information presented in "Introduction
to Infrared and Electro-Optical Systems," by Ronald G. Driggers and Melvin H. Friedman.
Graciously provided by
1. What is the term for light distribution on the image plane from a point
a) Point spread function
b) Light distribution function
Specular distribution function
d) Snell's Law
What is the term for when there is a fixed phase relationship of an EM field between two points
in space or two points in time?
3. What is the term describing "any
deviation of light rays from rectilinear paths which cannot be interpreted as reflection or refraction?"
d) Specular addition
4. Which material listed below has the highest total emissivity
(defined as total spectral signature wrt a blackbody)?
a) Snow & graphite
b) Paper & brick
c) Polished gold & polished brass
brass & oxidized steel
Match the lens ray tracing diagram with its application type.
a) Magnifying glass
b) Telescope ____
Search light ____
6. What is a 'Cold Shield' as used
in electro-optical systems?
a) A military acronym for special night combat exercises
b) A cooled aperture adjacent to the detector plane
c) Super-cooled armor placed
around an infrared system
d) The cold calibration standard used in conjunction with a
7. What are the two general classes of
a) Electronic and photonic
b) Photon (quantum)
c) Up and down spin
d) Commercial and military
8. What is a bolometer?
a) A device for generating a broadband
b) A device for generating a narrowband noise spectrum
c) A device
for measuring the inverse resistance of light
d) A device which varies its electrical
resistance depending on the total electromagnetic power incident upon it.
9. What is the modern name of the U.S. Army's former Night Vision Laboratory
a) Post-Day Vision Laboratory (PDVL)
b) Night Vision & Electronic
Sensors Directorate (NVESD)
Robert C. Byrd Night Vision Laboratory (RCBNVL)
b) Night Vision &
Electronic Sensors Directorate (NVESD)
The [infrared] effort began approximately 50 years
ago at the then U.S. Army Night Vision Laboratory (NVL). Today NVL is known as the U.S. Army Communications &
Electronics Command (CECOM), but is still referred to as NVL in the community and that acronym.
(see page 373)
10. What is Persistent Surveillance?
a) The use of wide-area coverage airborne sensors
b) Long-term surveillance
c) Unyielding surveillance
d) Narrowly focused surveillance
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answers and explanations.