Post on 03-Apr-2018
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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.