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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Introduction to Infrared and Electro-Optical Systems
RF Cafe Quiz #48

RF Engineering Quizzes - RF CafeAll RF Cafe Quizzes make great 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. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

Introduction to Infrared and Electro-Optical Systems - RF CafeThis 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 Artech House

 

1.  What is the term for light distribution on the image plane from a point source?

a)  Point spread function

b)  Light distribution function

c)  Specular distribution function

d)  Snell's Law

 

 

2.  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?

a)  Commonality

b)  Planar

c)  Incoherence

d)  Coherence

 

 

3.  What is the term describing "any deviation of light rays from rectilinear paths which cannot be interpreted as reflection or refraction?"

a)  Reflection

b)  Refraction

c)  Diffraction

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

d)  Oxidized brass & oxidized steel

 

 

Optical Lens Ray Tracing - RF Cafe5.  Match the lens ray tracing diagram with its application type.

a)  Magnifying glass ____

b)  Telescope          ____

c)  Camera             ____

d)  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 "hot" standard

 

 

7.  What are the two general classes of electro-photonic detectors?

a)  Electronic and photonic

b)  Photon (quantum) and thermal

c)  Up and down spin

d)  Commercial and military

 

 

8.  What is a bolometer?

a)  A device for generating a broadband noise spectrum

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 (NVL)?

a)  Post-Day Vision Laboratory (PDVL)

b)  Night Vision & Electronic Sensors Directorate (NVESD)

c)  Robert C. Byrd Night Vision Laboratory (RCBNVL)

d)  Night Vision Laboratory (NVL)

 

 

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

 

Need some help? Click here for the answers and explanations.

Quizzes from vintage electronics magazines such as Popular Electronics, Electronics-World, QST, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes Vintage Electronics Magazine Quizzes

 

 

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