
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

2003 Course Laser Applications in Instrumentation (Elective I)

3 pages, 26 questions, 0 questions with responses, 0 total responses,

	pune_eng	+Fave Message
	Profile Timeline Uploads Q & A

Home > pune_eng >

Instantly get Model Answers to questions on this ResPaper. Try now!
NEW ResPaper Exclusive!

Formatting page ...

Total No. of Questions :12] [Total No. of Pages : 3 P1562 [3764]-286 B.E. (Instrumentation & Control) LASER APPLICATIONS IN INSTRUMENTATION (Elective - I) (2003 Course) Time :3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from section I and section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Use of electronic pocket calculator is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Explain the importance of Einstein s equations in emissions of radiation. [8] b) Explain in detail the process of emission and absorption of radiation.[8] OR Q2) a) b) State the different processes due to which the small gain coefficients of laser get affected. [8] Write short notes on : i) Laser modes. ii) [8] Q switching. Q3) a) What is different laser system features which are applicable to most commercial and industrial lasers? Explain each in short. [12] b) Estimate the efficiency of a GaAs laser operating well above threshold. The refractive index of material is 2.6 and laser cavity length is 0.3 mm. The loss coefficient is 900 per metre length and the internal quantum efficiency is 0.8. [6] OR P.T.O. Q4) a) Explain the construction and working of diode laser. [8] b) How the laser products are classified for safety standards? [4] c) Calculate the threshold pumping power of a Nd: Glass laser for critical population inversion of 10 10 21/m3 and spontaneous life time of 200 s. The upper level is at energy of 1.6eV. [6] Q5) a) Describe how Fabry-Perot interferometer is used with small coherent length source for displacement measurements. [8] b) What is Speckle Pattern? Describe subjective and objective speckles. [8] OR Q6) a) b) Describe the dynamic tracking of speckle pattern for displacement measurements. [8] Describe the properties of speckle pattern in short. [8] SECTION - II Q7) a) b) Explain the principle of operation of Laser vibrometer. [8] Compare the two options for the electronic processing of the Doppler signal? [8] OR Q8) a) Explain the frequency domain processing of Doppler signal in detail.[8] b) Discuss the performance parameters of operation of laser velocimeter? [8] Q9) a) Explain the Sagnac effect? Show how is the phase shift is proportional to the angular velocity. [8] b) Explain the components required for all fiber FOG configuration. [8] OR Q10)a) b) Show that the frequency of the sagnac signal in RLG is proportional to the angular velocity of rotation. [8] Explain in detail the Fiber Optic Gyroscope. [3764]-286 2 [8] Q11) a) b) Write a short note on Holographic Interferometer. [9] What are different emulsions used to record the holograms? Mention the characteristics of it. [9] OR Q12)a) A thin strip of the hologram undergoing stress parallel to the x-axis is illuminated by a He-Ne laser. The fringes are localized in a plane having slope of 1.6 per unit length in x-direction and the fringe spacing is found to be 2 mm. Hence find the strain. [8] b) Explain the any one applications of holographic interferometer that you know. [10] #### [3764]-286 3

Formatting page ...

Tags : Pune, Engineering, University of Pune, Engineering question papers, Pune University, previous year question papers, question papers, india, model question paper, pune university paper pattern, pune university syllabus, old question papers

pune_eng chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: