Tacheometric surveying

Slides:

Advertisements

Similar presentations

TACHEOMETRIC SURVEYING

Advertisements

TACHEOMETRIC SURVEYING

Option G: Electromagnetic Waves G2: Optical Instruments.

Subject: PHYSICS Topic: Convex lens Light refraction in Prism Ray diagram of a convex lens Ray diagram illustrating graphical construction rules of a.

1© Manhattan Press (H.K.) Ltd. Final image at infinity Eye-ring Eye-ring 12.6 Refracting telescope.

Lenses. Transparent material is capable of causing parallel rays to either converge or diverge depending upon its shape.

Convex and Concave Lenses

Surveying I. Lecture 2..

Sz. Rózsa: Surveying I. – Lecture 2

Chapter 23 Mirrors and Lenses.

Lenses Astrophysics Lessons 1. Homework No homework except to revise for the mock exam next Friday!

Convex and Concave Lenses

J.M. Gabrielse Review: The Refraction of Light Light moves at different speeds through different media. When it travels from one medium into another, the.

Chapter 34 Geometric Optics. What is Geometric Optics It is the study of light as particles. Geometric optics treats light as particles (or rays) that.

Chapter 23 Mirrors and Lenses. Notation for Mirrors and Lenses The object distance is the distance from the object to the mirror or lens Denoted by p.

Chapter 34: Thin Lenses 1 Now consider refraction through this piece of glass: optic axis This is called a “Double Convex Lens” converging light focal.

Ch. 18 Mirrors and Lenses Milbank High School. Sec Mirrors Objectives –Explain how concave, convex, and plane mirrors form images. –Locate images.

Types of Lenses If you have ever used a microscope, telescope, binoculars, or a camera, you have worked with one or more lenses. A lens is a curved transparent.

Light and Reflection Level 1 Physics. Facts about Light It is a form of Electromagnetic Energy It is a part of the Electromagnetic Spectrum and the only.

Optics: Lenses & Mirrors. Thin Lenses Thin Lenses: Any device which concentrates or disperses light. Types of Lenses:  Converging Lens: Parallel rays.

Reflecting Telescopes Astrophysics Lesson 3. Homework Collect last homework – feedback on Friday. Past Paper Question for this Friday.

Design Realization lecture 26 John Canny 11/25/03.

F f When viewing a distant object through a converging lens, the image forms 2. at a position q < f ~ 4. at a position q > f ~ 3. at an exact position.

Physics 1809 Optics 2: Spherical Lenses and Optical Instruments Purpose of this Minilab Use lens formula to determine focal length of a lens. Learn about.

Convex Lens A convex lens curves outward; it has a thick center and thinner edges.

Sz. Rózsa: Surveying I. – Lecture 1

1© Manhattan Press (H.K.) Ltd. Terms used for lenses Images in lenses Images in lenses 12.2 Converging and diverging lenses Lens formula Lens formula.

KEYWORDS: refraction, angle of incidence, Angle of refraction, refractive index KEYWORDS: refraction, angle of incidence, Angle of refraction, refractive.

A. can be focused on a screen. B. can be projected on a wall.

Chapter 23 Mirrors and Lenses.

Refracting Telescopes Astrophysics Lesson 2. Homework No homework except to revise for the mock exam on Friday!

The Simple Astronomical Telescope. The angular magnification, M, (also sometimes called magnifying power) produced by an optical instrument is defined.

Chapter 36 Image Formation (Lens and Mirrors) Using the ray approximation of geometric optics, we can now study how images are formed with mirrors and.

Curved Lenses SNC2P – Optics. Lenses Lenses are thin pieces of glass or plastic that have at least one curved side. There are two basic types of lenses:

ERT247/4 GEOMATICS ENGINEERING

Images formed by lenses. Convex (converging) lenses, f>0.

The Simple Astronomical Telescope. The angular magnification, M, (also sometimes called magnifying power) produced by an optical instrument is defined.

Lenses – Application of Refraction AP Physics B. Lenses – An application of refraction There are 2 basic types of lenses A converging lens (Convex) takes.

You should be able to: Draw ray diagrams for converging and diverging lenses Use the equation 1/u+1/v =1/f for converging lenses Perform.

Refraction When light passes from one medium to another, it bends.

Lesson 4 Define the terms principal axis, focal point, focal length and linear magnification as applied to a converging (convex) lens. Define the power.

Its now time to see the light…..  A lens is a curved transparent material that is smooth and regularly shaped so that when light strikes it, the light.

Refraction of light through a Convex Lens. Lens diagram a cross section through the centre plane.

Thin Lens Chapter Bending of Light Any transparent object that is curved with affect the path of light rays. Ex: o Glass bottle full of water will.

Rays and imaging v_optics/examples/optics_bench.html.

ERT247/4 GEOMATICS ENGINEERING

Surveying 1 / Dr. Najeh Tamim CHAPTER 5 ANGLES, DIRECTIONS, AND ANGLE MEASURING EQUIPMENT.

1.Describe two differences between electromagnetic waves and other (mechanical) waves. 2.Write down the names of all seven types of electromagnetic waves.

Objective To use angles of elevation and depression to solve problems.

Mirrors. Types of mirror There are two types of mirror Plane (flat) Curved Concave (curves in) Convex (curves out)

How Does a Lens Work? Light travels slower in the lens material than in the air around it. This means a linear light wave will be bent by the lens due.

REFRACTION OF LIGHT & OPTICAL INSTRUMENTS Chapter 14.

Refraction. Refraction of Light When light waves pass from one medium to the next, its speed changes, causing it to bend. Going from lower to higher index.

Ray Diagrams for Lenses

Module 5 Optional Component

Lenses Topic 13.4.

Stadia Theory SURVEY2.

Ch.13 Applications (應用) of Convex Lenses

Tacheometric Surveying Mr. Vedprakash Maralapalle, Asst. Professor

TACHEOMETRIC SURVEYING

Tacheometric Surveying

Visit for more Learning Resources

Presentation transcript:

Tacheometric surveying

Tacheometer Tacheometer is transit theodolite fitted with stadia diaphragm, and analltic lens Anallatic lens: Additional convex lens is provided between the eye piece and the object glass at a fixed distance from the object glass. The purpose of providing anallatic lens is to make additive constant (f+d) exactly zero.

Advantage Disadvantage Anallatic lens is provided in external focusing telescope, not required in internal focusing telescope. Advantage it simplifies the calculation by making the additive constant ‘0’. Therefore, there is only one constant which is multiplying constant. Distances are directly calculated by multiplying the difference of stadia hair readings by 100. Disadvantage Brightness of the image is much reduced due to absorption of light.

Principle of tacheometry The principle of techeometry is based on property of isoscales triangles, where the ratio of distance of the base from apex and length of the base is always constant. D1/S1=D2/S2=D3/S3=f/I (multiplying constant) F= focal length of object and i= stadia intercept

Theory of stadia Tacheometery

The stadia readings with horizontal sight on a vertical staff held 50 m from a tacheometer were 1.285 m and 1.780 m. the focal length of the object glass was 25 cm. the distance between the object glass and the vertical axis of the tacheometer was 15 cm. calculate the stadia interval.

Theory of anallatic lens Notation S = staff intercept CD1 O= Optical centre of object glass A= Optical centre of anallatic lens V= vertical axis of inst. P= Principal focus of the anallatic lens f1 and f2= conjugate focal lengths of the object glass f= focal length of object glass f’= focal length of the anallatic lens K= distance between object glass and anallatic lens d= distance between optical centre of object glass and vertical axis of instrument M=distance between optical centre of object glass and real image dc i= length of real image dc, when anallatic lens is provided I’= length of real image d3c3, when anallatic lens is not provided D= distance between vertical axis of instrument and the staff

Home assignment (no need to submit): How does the an anallactic lens work to reduce the additive constant to zero? Illustrate the working of anallactic lens by a neat diagram and discuss the effect on constants using appropriate expression? Derive the distance and elevation formulae for following cases of tachometry. Inclined sight and staff vertical (for angle of elevation and depression both) Inclined sight and staff normal (for angle of elevation and depression both)