PRINCIPLE OF OPTICAL MEASURING INSTRUMENTS 1.INTERFERENCE: When two wave trains of the same frequency & the same amplitude traveling in the same direction.

Slides:

Advertisements

Similar presentations

Lecture 4: Interference and diffraction of light (I)

Advertisements

Interferometry It deals with experimental study of the phenomenon of interference. Instruments used in this study are based on principle of interference.

Interference and Diffraction

Diffraction The bending/spreading of waves as they go through gaps or around edges The effect is greatest when gap width is equal to or smaller than the.

Diffraction and Interference

Chapter 24 Wave Optics.

What’s so Special about a Laser?

IVA. Electromagnetic Waves and Optics

PHY 1371Dr. Jie Zou1 Chapter 37 Interference of Light Waves.

The Hong Kong Polytechnic University Optics II----by Dr.H.Huang, Department of Applied Physics1 Interference Conditions for Interference: (i) (  2 

Part 1 Interference of light

Chapter 16 Interference and Diffraction Interference Objectives: Describe how light waves interfere with each other to produce bright and dark.

B. Wave optics Huygens’ principle

Young’s Double Slit Experiment: This is an important historical experiment, because it provided convincing evidence that light was a wave. There was.

Mfd Sir Isaac Newton ( ) believed that light consisted of particles or corpuscles. The Dutch scientist, Christian Huygens ( ), agreed.

I NTERFERENCE AND D IFFRACTION Chapter 15 Holt. Section 1 Interference: Combining Light Waves I nterference takes place only between waves with the same.

Interference Diffraction and Lasers

Chapter 37 Wave Optics. Wave optics is a study concerned with phenomena that cannot be adequately explained by geometric (ray) optics.  Sometimes called.

By Bhaskar Department of Physics K L University. Lecture 3 (30 July) Interference.

The wave nature of light Interference Diffraction Polarization

CHAPTER 37 : INTERFERENCE OF LIGHT WAVES

Diffraction is the bending of waves around obstacles or the edges of an opening. Huygen’s Principle - Every point on a wave front acts as a source of tiny.

WAVE OPTICS & LASER.

Transverse or longitudinal waves transport energy from one point to another. Each particle in the medium vibrates or oscillates, and disturbs the neighbouring.

I NTERFERENCE AND D IFFRACTION Chapter 15 Holt. Section 1 Interference: Combining Light Waves I nterference takes place between waves with the same wavelength.

Ch 16 Interference. Diffraction is the bending of waves around obstacles or the edges of an opening. Huygen’s Principle - Every point on a wave front.

Wave superposition If two waves are in the same place at the same time they superpose. This means that their amplitudes add together vectorially Positively.

Interference & Diffraction. Interference Like other forms of wave energy, light waves also combine with each other Interference only occurs between waves.

Diffraction – waves bend as they pass barriers

Example Two identical point sources produce water waves with a wavelength of 0.04 m. The sources are 0.1 m apart. What is the maximum angle for a line.

Lecture Nine: Interference of Light Waves: I

Interference & Diffraction Gratings

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Interference and Diffraction Chapter 15 Table of Contents Section.

WAVE OPTICS - I Electromagnetic Wave Wave front Huygens’ Principle

Waves Progressive waves Transverse and longitudinal waves Polarization

DIFFRACTION AND INTERFERENCE. Specification Topics Interference The concept of path difference and coherence The laser as a source of coherent monochromatic.

Chapter 24 Wave Optics Conceptual Quiz Questions.

 The extent to which light waves bend depends on the size of the opening.

Chapter 15 Preview Objectives Combining Light Waves

Interference & Diffraction Light Part 4. Interference Like other forms of wave energy, light waves also combine with each other Interference only occurs.

Chapter15 Section 1 Interference. Objectives Describe how light waves interfere with each other to produce bright and dark fringes. Identify the conditions.

Like other waves, light waves can add constructively and destructively as shown above. Examples: –Colors seen in soap bubbles –Colors seen in a thin film.

Chapter 10.2 Wave Interference and Diffraction Interference.

Interference. Overlap  Waves from multiple point sources overlap. Crest on crest Trough on trough Crest on trough  Overlapping waves add directly. Principle.

Interference and Diffraction

B. Wave optics Huygens’ principle

Chapter 25 Wave Optics.

Announcements Final exam day events (Friday, May 12, 10:00am to 12:00pm) 50-point multiple choice end-material test (covering material from chapters 33-36).

The wave nature of light Interference Diffraction Polarization

Diffraction & Interference

Interference of Light Waves

Wave superposition If two waves are in the same place at the same time they superpose. This means that their amplitudes add together vectorially Positively.

Wave superposition If two waves are in the same place at the same time they superpose. This means that their amplitudes add together vectorially Positively.

Diffraction of Water Waves

Interference and Diffraction of Waves

Diffraction and Interference

WAVE OPTICS - II Electromagnetic Wave Diffraction

Thin film Interference

Interference of Light Waves

MICHELSON INTERFEROMETER

Young’s Double Slit Experiment.

Example Example 3: This experiment demonstrates the interference of light. S1 S2 S single slit slide light source translucent screen interference fringe.

Two-beam interference:

B. Wave optics Huygens’ principle

Wave Interference.

DIFFRACTION AND INTERFERENCE

Interference and Diffraction

Presentation transcript:

PRINCIPLE OF OPTICAL MEASURING INSTRUMENTS 1.INTERFERENCE: When two wave trains of the same frequency & the same amplitude traveling in the same direction are superimposed on one another they produce interference If at any point the waves are in phase, there is an increase in resultant amplitude, i.e. a constructive interference. If the waves are out of phase & there is decrease in the resultant amplitude, i.e. destructive interference 18/2/20121lec# 13 & 14

PRINCIPLE OF OPTICAL MEASURING INSTRUMENTS 2. CONDITIONS FOR INTERFERENCE OF LIGHT WAVES: 1.The two sources should continuously emit waves of the same wave length or frequency 2.For obtaining interference fringes, the amplitude of the two interfering wave trains should equal or very nearly equal 3.The two sets of wave-trains from the two sources should either have the same phase or a constant in difference in phase 4.The two sources should be very narrow 18/2/20122lec# 13 & 14

PRINCIPLE OF OPTICAL MEASURING INSTRUMENTS 3. MONOCHROMATIC BEAM OF LIGHT: A Monochromatic beam of light gives light of only one wave length or one color. It is difficult to get a truly monochromatic source of light. However by using light filters it is possible to get a source that gives light within a narrow bend of wave lengths ±5x m Light emitted by certain elements eg. Mercury, sodium & cadmium is suitable. In metrology this light is usually obtained from an electrical discharge lamp 18/2/20123lec# 13 & 14

PRINCIPLE OF OPTICAL MEASURING INSTRUMENTS Depending upon the optical setup, the interference bands can appear as parallel bands, or as concentric circles The interference phenomenon can be used to make the measurement of high precision by utilizing the fact that the path difference b/w two dark bands or two light bands is one wave length 18/2/20124lec# 13 & 14

PRACTICAL # 03 Object: To learn different uses of Combination set Apparatus: Combination set with 300mmblade, square head & centre head, sections for angle measurement Procedure: As Demonstrated Learning Outcome: After performing measurements with combination set we feel confidence to make its application independently 18/2/2012lec# 13 & 145

PRACTICAL # 03 Combination Sets can be used as: Outside try square Inside try square Mitre Square Sprit level 45 level Plumb level Depth gauge Height gauge Marking gauge Centre head use Protractor use 18/2/2012lec# 13 & 146