PPT - Ultrasonics - Civil Engineering (CE) PDF Download

 Page 1


PH0101 UNIT 1 LECTURE 6 1
 Introduction to Ultrasonics
 Properties of Ultrasonic waves
 Ultrasonic Production- Magnetostriction
Method
 Ultrasonic Production- Piezo Electric Method
 Applications of Ultrasonics
 Worked Problem
Page 2


PH0101 UNIT 1 LECTURE 6 1
 Introduction to Ultrasonics
 Properties of Ultrasonic waves
 Ultrasonic Production- Magnetostriction
Method
 Ultrasonic Production- Piezo Electric Method
 Applications of Ultrasonics
 Worked Problem
PH0101 UNIT 1 LECTURE 6 2
Introduction to Ultrasonics
 The word ultrasonic combines the Latin roots ultra,
meaning ‘beyond’ and sonic, or sound.
 The sound waves having frequencies above the audible
range i.e. above 20000Hz are called ultrasonic waves.
 Generally these waves are called as high frequency
waves.
 The field of ultrasonics have applications for imaging,
detection and navigation.
 The broad sectors of society that regularly apply ultrasonic
technology are the medical community, industry, the
military and private citizens.
Page 3


PH0101 UNIT 1 LECTURE 6 1
 Introduction to Ultrasonics
 Properties of Ultrasonic waves
 Ultrasonic Production- Magnetostriction
Method
 Ultrasonic Production- Piezo Electric Method
 Applications of Ultrasonics
 Worked Problem
PH0101 UNIT 1 LECTURE 6 2
Introduction to Ultrasonics
 The word ultrasonic combines the Latin roots ultra,
meaning ‘beyond’ and sonic, or sound.
 The sound waves having frequencies above the audible
range i.e. above 20000Hz are called ultrasonic waves.
 Generally these waves are called as high frequency
waves.
 The field of ultrasonics have applications for imaging,
detection and navigation.
 The broad sectors of society that regularly apply ultrasonic
technology are the medical community, industry, the
military and private citizens.
PH0101 UNIT 1 LECTURE 6 3
Properties of ultrasonic waves
(1)  They have a high energy content.
(2)  Just like ordinary sound waves, ultrasonic waves
get reflected, refracted and    absorbed.
(3)  They can be transmitted over large distances
with no appreciable loss of energy.
(4) If an arrangement is made to form stationary waves of
ultrasonics in a liquid, it serves as a diffraction grating. It is called
an acoustic grating.
(5) They produce intense heating effect when passed through a
substance.
Page 4


PH0101 UNIT 1 LECTURE 6 1
 Introduction to Ultrasonics
 Properties of Ultrasonic waves
 Ultrasonic Production- Magnetostriction
Method
 Ultrasonic Production- Piezo Electric Method
 Applications of Ultrasonics
 Worked Problem
PH0101 UNIT 1 LECTURE 6 2
Introduction to Ultrasonics
 The word ultrasonic combines the Latin roots ultra,
meaning ‘beyond’ and sonic, or sound.
 The sound waves having frequencies above the audible
range i.e. above 20000Hz are called ultrasonic waves.
 Generally these waves are called as high frequency
waves.
 The field of ultrasonics have applications for imaging,
detection and navigation.
 The broad sectors of society that regularly apply ultrasonic
technology are the medical community, industry, the
military and private citizens.
PH0101 UNIT 1 LECTURE 6 3
Properties of ultrasonic waves
(1)  They have a high energy content.
(2)  Just like ordinary sound waves, ultrasonic waves
get reflected, refracted and    absorbed.
(3)  They can be transmitted over large distances
with no appreciable loss of energy.
(4) If an arrangement is made to form stationary waves of
ultrasonics in a liquid, it serves as a diffraction grating. It is called
an acoustic grating.
(5) They produce intense heating effect when passed through a
substance.
PH0101 UNIT 1 LECTURE 6 4
Ultrasonics Production
Ultrasonic waves are produced by the
following methods.
(1) Magneto-striction generator or oscillator
(2) Piezo-electric generator or oscillator
Page 5


PH0101 UNIT 1 LECTURE 6 1
 Introduction to Ultrasonics
 Properties of Ultrasonic waves
 Ultrasonic Production- Magnetostriction
Method
 Ultrasonic Production- Piezo Electric Method
 Applications of Ultrasonics
 Worked Problem
PH0101 UNIT 1 LECTURE 6 2
Introduction to Ultrasonics
 The word ultrasonic combines the Latin roots ultra,
meaning ‘beyond’ and sonic, or sound.
 The sound waves having frequencies above the audible
range i.e. above 20000Hz are called ultrasonic waves.
 Generally these waves are called as high frequency
waves.
 The field of ultrasonics have applications for imaging,
detection and navigation.
 The broad sectors of society that regularly apply ultrasonic
technology are the medical community, industry, the
military and private citizens.
PH0101 UNIT 1 LECTURE 6 3
Properties of ultrasonic waves
(1)  They have a high energy content.
(2)  Just like ordinary sound waves, ultrasonic waves
get reflected, refracted and    absorbed.
(3)  They can be transmitted over large distances
with no appreciable loss of energy.
(4) If an arrangement is made to form stationary waves of
ultrasonics in a liquid, it serves as a diffraction grating. It is called
an acoustic grating.
(5) They produce intense heating effect when passed through a
substance.
PH0101 UNIT 1 LECTURE 6 4
Ultrasonics Production
Ultrasonic waves are produced by the
following methods.
(1) Magneto-striction generator or oscillator
(2) Piezo-electric generator or oscillator
PH0101 UNIT 1 LECTURE 6 5
Magnetoagnetostriction Generator
Principle: Magnetostriction effect
When a ferromagnetic rod like iron or
nickel is placed in a magnetic field
parallel to its length, the rod
experiences a small change in its
length.This is called magnetostricion
effect.