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1997 Course Opto Electronics

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Total No. of Questions : 10] [Total No. of Pages : 2 [3664] - 62 P 1113 B.E. (Industrial Electronics) OPTO ELECTRONICS (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Explain with energy diagram working of He-Ne laser. [8] Explain working of gas discharge lamp and list advantages, disadvantages and applications. [8] Q2) a) b) Explain working of Bulk photo detector, LDR with neat diagram. [8] Why photomultiplier tubes are required? Explain with neat diagram it operation. [8] Q3) a) Explain battery charging application of solar cell with neat circuit diagram. [8] Explain solar cell operation with neat diagram. [8] b) Q4) a) b) Explain four important specifications of Opto-coupler. Draw a source detector combinations circuit diagram i) LED - phototransistor. ii) Incandescent lamp - LDR. iii) LED - LASCR. iv) LASER Diode - Photo Diode. Q5) Write short note on : a) IR and UV detectors. b) Thermal Detectors. c) Photo-Detector characteristics. [8] [8] [18] P.T.O. SECTION - II Q6) a) b) Explain working of CRT display. With neat diagram explain Bar-Graph display. Q7) a) Explain with construction details and refractive index profiles i) Step-index multimode fiber. ii) Graded-index multimode fiber. [8] Explain with neat diagram how light propagates through optical fiber. [8] b) [8] [8] Q8) a) b) Explain attenuation characteristics of optical fiber. How to measure illumination using LDR as a sensor. [8] [8] Q9) a) b) Explain displacement measurement using optical fiber sensor. Explain working principle of hologram. [8] [8] Q10)Write short notes on : a) OTDR. b) RPM measurement using optical sensor. c) Compare optical fiber and coper wire. [3664] - 62 -2- [18]

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