Chapter: Measurements and Instrumentation - Transducers and Data Acquisition Systems

Transducers

The input quantity for most instrumentation systems is nonelectrical. In order to use electrical methods and techniques for measurement, the nonelectrical quantity is converted into a proportional electrical signal by a device called transducer.

TRANSDUCERS

 

Ø     The input quantity for most instrumentation systems is nonelectrical. In order to use electrical methods and techniques for measurement, the nonelectrical quantity is converted into a proportional electrical signal by a device called transducer.

 

Ø     Another definition states that transducer is a device which when actuated by energy in one system, supplies energy in the same form or in another form to a second system.

 

Ø     When transducer gives output in electrical form it is known as electrical transducer. Actually, electrical transducer consists of two parts which are very closely related to Each other.

 

Ø     These two parts are sensing or detecting element and transduction element. The sensing or detecting element is commonly known as sensor.


Ø     Definition states that sensor is a device that produces a measurable response to a Change in a physical condition.

 

Ø  The transduction element transforms the output of the sensor to an electrical output, as shown in the Fig.






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