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Transducers

Gordon Shering

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Introduction

What is a transducer.

Different types of transducers. Examples of commercial transducers.

Using transducers on control systems.

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What is a Transducer?

A device for turning one form of energy into

another form of energy.

Input Output

Transducer

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What is a Transducer?

The input can be length, force, pressure, light,

tempature etc.

The output can be anything but most typically anelectrical (analogue) signal.

The analoge siganal may be converted into a digital

signal with an ADC for computer systems

Input Output

Transducer

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Transducers

The input can be length, force, pressure, light,

tempature etc.

The output can be anything but most typically anelectrical (analogue) signal.

The analoge siganal may be converted into a digital

signal with an ADC for computer systems

Input Output

Transducer

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Position Transducers

A Potentiometer may be used tomeasure position or movement.

Electrical contacts age and can becomeunreliable.

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Liquid Level Transducers

A Potentiometer used with a float to

measure liquid level.

Is this used in a car to measure petrol?.

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Pressure Transducers

A Potentiometer used with bellows

or a diaphragm to measure presure.

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Pressure Transducers

Other ways to measure pressure.

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Position Transducers (Magnetic)

Using magnetic coupling has the advantagethat there are no rubbing contacts.

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Position Transducers (Capacitive)

Using capacitive coupling can also be usedand also has the advantage that there are norubbing contacts.

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Position Transducers (Optical)

Optics can be used to give a digital outputdirectly. In this case rotational position is beingmeasured.

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Position Transducers (Optical)

What is the name for the cyclic code on the right.? Why is the wheel on the write normally used instead

of the wheel on the left.?

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Force Transducers (Strain gauge)

A strain gauge can be used to measure force. This could be used as a weighing machine.

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Force Transducers (Strain gauge)

Real commercial strain gages aredesigned to give maximumsensitivity.

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Temperature Transducers

A thermo couple uses two differentmetals that generate a voltage whenthey are heated.