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Posted By: Sree.... Member Level: Diamond Posted Date: 11 Feb 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech OPTO ELECTRONICS & LASER INSTRUMENTATION Set No. 3 Question paper
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Code No: RR422204 Set No. 3
IV B.Tech II Semester Supplementary Examinations, June 2007
OPTO ELECTRONICS & LASER INSTRUMENTATION
(Instrumentation & Control Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. Discuss about the following in detail with the necessary figures and graphs.
(a) Multimode graded index fibres.
(b) Single mode fibres. [8+8]
2. Explain about the following with the necessary figures.
(a) Optical fibers for communication.
(b) Optical fibers for Instrumentation. [8+8]
3. (a) Explain any two pumping schemes with neat diagrams for Ruby Laser. Com-
pare the performances.
(b) Name the first gas laser that was operated successfully. Explain the construc-
tion and working principle of this laser with a neat diagram. Show the energy
level diagram also. [8+8]
4. (a) Describe the working of Moire-fringe modulation fiber optic sensor.
(b) Write in detail about IR sources. [8+8]
5. (a) Differentiate between a transducer and a sensor.
(b) Explain a method for measurement of current by a single mode fiber optic
sensor with the help of a diagram.
(c) How do you estimate the transmission line loss using the above sensor.
[5+6+5]
6. Explain with neat diagrams how lasers are used in the following applications
(a) Lasers in surgery
(b) Lasers in low power measurement. [8+8]
7. (a) With the help of neat sketches explain reconstruction of hologram with a wave
identical to reference wave and with a wave conjugate to reference wave?
(b) Explain in detail various recording and reconstruction devices of hologram?
[8+8]
8. (a) What is meant by modulation of a signal? Discuss Raman - Nath acousto-
optic modulator.
(b) Why this modulator has a limited modulation bandwidth. [8+8]
? ? ? ? ?
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