FACULTY OF ENGINEERING B.E. 4/4 (Inst.) I – Semester (Suppl) Examination, May 2013 Subject : Optoelectronic Instrumentation Time : 3 hours
Max. Marks : 75
Note: Answer all questions from Part-A. Answer any FIVE questions from Part-B. PART – A (25 Marks) 1. Define mode locking.
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2. Explain about population inversion in a 3 level system.
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3. Define Laser spectroscopy.
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4. Explain working of a laser strain guage.
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5. Define splicing.
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6. Explain measurement of voltage using fibre optic sensor.
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7. Mention the advantages of graded index fibres.
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8. Compare various optical fibre manufacturing techniques.
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9. Mention application of optoelectronic isolators.
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10. When a LED has 2 volts applied to its terminals, it drawn 100 mA and produces 2 mw optical power. What is the LED’s conversion efficiency from electrical to optical power. 3 PART – B (50 Marks) 11.a) With an energy level diagram explain CO2 laser. b) Mention advantages of semi conductor lasers.
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12.a) Explain Q-switching and mode locking properties of lasers. b) Explain operating principle of holography.
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13. Explain the following applications of laser in detail a) Laser welding b) Blood less eye surgery
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14. Explain the following modulation techniques using optical fibre a) Electro optic b) Acousto optic
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15. Explain working principles of a) Photo coupler b) Temperature measurement using optical sensor
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16. Explain the measurement of temperature and pressure using fibre optic sensor.
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17. Briefly discuss about : a) Laser spectroscopy b) Fundamentals of transmission theory
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