FIBRE OPTICS AND LASER INSTRUMENTS Question paper Nov/Dec 2010


B.E/B.Tech Degree Examination November/December 2010, 
Seventh Semester, 
Electrical and Electronics Engineering, 
EI1001-FIBRE OPTICS AND LASER INSTRUMENTS

Answer all the questions.


Part-A

(10*2=20)
1. State the advantages of optic fibre.
2. What is acceptance angle?
3. Mention the applications of fibre optic sensor.
4. Define Moire fringes.
5. What are the properties of LASER?
6. What is cavity damping?
7. What is LASER heating?
8. Define Vaporization.
9. What are holographic components?
10. List the medical applications of LASER.

Part-B
(5*16=80)
11.(a)(i) Explain step and Graded index fibre. (8)
(ii) Write a note on intrinsic and extrinsic absorption. (8)
Or
11.(b)(i)Discuss linear and non-linear scattering. (8)
(ii) Explain the characteristics of optical sources and detectors. (8)

12.(a)(i) Describe the fibre optic instrumentation system for the measurement of strain. (8)
(ii) Explain different types of modulators used in fiber optic instrumentation system. (8)
Or
12.(b)(i) Explain the principle of interferometric method of measurement of length. (8)
(ii) Explain the method of measurement of temperature using fibre optic sensors. (8)

13.(a)(i) Describe LASER modes. (8)
(ii) Explain Q-switching and Mode locking. (8)
Or
13.(b) With neat diagram explain the working of liquid and semiconductor laser. (8+8)

14.(a) Describe the method for the measurement of 
(i) Acceleration and
(ii) Current
Or
14.(b) Explain the industrial application of LASER in material processing. (16)

15.(a)(i) Discuss holography for non-destructive testing. (8)
(ii) Describe the LASER instruments for surgery and removal of tumors of vocal cards. (8)
Or
15.(b)(i) Explain holography in detail. (8)
(ii) Explain the medical applications of LASER in gynecology and oncology. (8)