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ULTRASONIC SENSOR
Nemish V. Bhojani 150130103017
GOVERNMENT ENGINEERING
COLLEGE,GANDHINAGAR
ULTRASONIC SENSORS
Technology and Use In Industry
ULTRASONIC SENSORS HISTORY
 Ian Donald and Tom Brown
 Used to test ships
 Built first Ultrasound in 1958
ULTRASONIC SENSORS
 Piezoelectric vs. Electrostatic
 Working Environments
 Near-Sightedness
 Traditional vs. New
Piezoelectric Ultrasonic
Sensor
Electrostatic Ultrasonic
Sensor
PIEZOELECTRIC EFFECT
 Discovered in 1880 by Pierre and Paul-Jacques Curie
 Name comes from piezein – Greek for “to press”
 Solid Material (Crystal, Ceramic, etc…)
 Voltage is created across solid material
 Piezoelectric Transducer does conversion
 Inverse Piezoelectric Effect creates rapid mechanical vibrations.
Balanced Charges
Charges out of
Place
Electric Dipole
Moments Cancel
Out
Voltage is Created
ELECTROSTATICS
Charges induced by a nearby
charge.

HOW DOES THE SENSING OCCUR?

ULTRASOUND
 Popular Imaging Technique
 Determining tissue formation in pregnant women
 Visualizing blood flow in body or fetus
 Early detection of cancerous and benign tumors
INDUSTRY USES
 Car Distance Sensors
 Assembly Lines
 High-Powered Cleaning
 Non-Destructive Testing
THANK YOU!

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