1. Active Transducer :
It is the type of transducer devices that does not require any exterior power supply for producing output and which is in a function to convert physical signals into electric powered signals by means of ability of itself. The active sensor does no longer need any other power supply to convert signals from one form to some different form. A thermocouple is instance of active transducer. Active transducer generates output in form of voltage and electric powered signals.
2. Passive Transducer :
It is externally powered transducer and is a type of gadget that is no longer in a position to convert physical signals into electric powered signals through itself, it converts signals by means of any other energy source i.e which produces variation when comes in contact with any passive element. Strain gauges, capacitive transducer, thermistors are examples of passive transducer. Its output form relies upon on variant in passive associated.
Difference between Active Transducer and Passive Transducer :
|S.No.||Active Transducer||Passive Transducer|
|1.||It is kind of transducer which generates output in form of voltage or current, without any exterior power supply.||It is kind of transducer whose interior parameters including capacitance, resistance and inductance modifies or changes when it comes in contact with any passive element.|
|2.||Its working principle includes drawing energy from measured source.||Its working principle includes drawing power from external source which results in a change in its physical properties.|
|3.||It has its own power supply for its functioning.||For its functioning, it requires an external power supply.|
|4.||It has a much simpler design, unlike Passive Transducer.||It has a design that is complex as compared to an Active Transducer.|
|5.||Smallest change in pressure that it can be detected in its output is very low, i.e it has a low resolution.||It can detect small changes in output easily and more accurately, i.e. it has a high resolution.|
|6.||The output of active transducers depends on signal which is used for measurement.||The output of passive transducers depends on signal from external power supply.|
|7.||These kinds of transducers are also known as self-generating transducers as they do not need any external power source.||These are also known as externally powered transducers as they need an external power supply to perform tasks.|
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