transducers & transmitters

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Transducers & Transmitters By Mahnoor Butt M12-CE16

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Page 1: Transducers & transmitters

Transducers & Transmitters

By Mahnoor ButtM12-CE16

Page 2: Transducers & transmitters

Transducers

Transducers are electric or electronic devices that transform energy from one form to another.

For Example: microphones, loudspeakers, thermometers, position and pressure sensors, and antenna.

Page 3: Transducers & transmitters

Working Principle

Page 4: Transducers & transmitters

Transducer Elements

Sensing element

Transduction element

Transducer contains two parts that are closely related to each other i.e. the sensing element and transduction element.

Page 5: Transducers & transmitters

Sensing element

The sensing element is called as the sensor. It is device producing measurable response to change in physical conditions.

A microphone converts sound waves that strike its diaphragm into an electrical signal that can be transmitted over wires.

Page 6: Transducers & transmitters

The transduction element convert the sensor output to suitable electrical form.

Transduction element

Page 7: Transducers & transmitters

It is a device that converts an electrical quantity into a non electrical physical quantity. It is a precision actuator having an electrical input and a non electrical output.

Amplifier

LoudspeakerMicrophone

Input Device

Controller Output Device

Inverse Transducers

Page 8: Transducers & transmitters

Selection of Transducer

Selection depends on:

• The physical quantity to be measured.

• The best transducer principle for the given physical input.

• The order of accuracy to be obtained.

Page 9: Transducers & transmitters
Page 10: Transducers & transmitters

Transmitter

A device which converts the reading from a primary sensor or transducer into a standard signal and transmits that signal to a monitor or controller to a longer distance.

Page 11: Transducers & transmitters

Working Principle

When we provide the ac current to any simple wire, it produces the potential difference at both ends of wire and so the current starts flowing into it. But when the wire is no longer able to hold the current, it starts radiating the energy outwards in form of radio waves , and these waves are also called the electromagnetic waves.

Page 12: Transducers & transmitters

Types of Transmitters

• Pressure transmitters

• Temperature transmitters

• Flow transmitters

• Level transmitters

Page 13: Transducers & transmitters

Difference

Transducer

• Voltage-output device

• more sensitive to electromagnetic interference

• For short electrical connection range

Transmitter

• current-output device

• less susceptible to electromagnetic interference

• For larger distances

Page 14: Transducers & transmitters

Thank you…