Based on the physical phenomenon Primary transducer Secondary transducer 2. Based on the power type Classification Active transducer Passive transducer 3. Based on the type of output the classification of transducers are made Analog transducer Digital transducer 4. Based on the electrical phenomenon is a best Classification of Trasnducer Resistive transducer Capacitive transducer Inductive transducer Photoelectric transducer Photovoltaic transducer 5.
Based on the non-electrical phenomenon Classification of transducer Linear displacement Rotary displacement 6. Based on the transduction phenomenon Transducer Inverse transducer. Factor to be considered while Selecting Transducer It should have high input impedance and low output impedance, to avoid loading effect.
It should have good resolution over is entire selected range. It must be highly sensitive to desired signal and insensitive to unwanted signal. Preferably small in size. It should be able to work n corrosive environment. The transducer which requires an external excitation to provide its output is referred to as a passive transducer.
Since these transducers use power from an auxiliary source, they also called Externally Powered Transducers. Some of the examples of passive transducers are,. One of the examples of resistive transducers is a potentiometer or POT.
The potentiometer is used for linear displacement measurement. A POT excited by a voltage source E i is shown in the below figure. Definition of Active Transducer : The transducer which does not require any external excitation to provide its output or for its operation is referred to as an active transducer.
Some of the examples of active transducers are, Photovoltaic cell it is used in light meters, solar cells Thermocouple used for measurement of temperature, radiation, and heat flow Piezo-electric crystal it is used for measurement of acceleration, vibrations, etc.
Piezo-electric Crystal : A piezoelectric crystal used in the measurement of acceleration is shown in the figure below. Active Transducer Passive Transducer The class or classification of transducers which doesn't require any external electrical energy for their actuation or operation are known as Active Transducers. The class or classification of transducers that require external electrical energy for their actuation or operation are said to be known as Passive Transducers.
The active transducers use applied non-electrical input energy for their operation and produce an electrical output. The passive transducers need additional electrical power for their operation to measure applied non-electrical input energy. These are also called self-generating transducers. The passive transducers are also called externally powerd transducers. The energy conversion process mechanical, chemical, thermal, or optical is simple.
Example : The linear potentiometer is the examples of the passive transducer. It is used for measuring the displacement. The POT requires the external power source e i for work. It measures the linear displacement x i. Consider the L is the length of the potentiometer. R i is their total internal resistance and x i is their input displacement. The output voltage is calculated by the formula shown below. The active and passive transducer both converts the physical forces into easy measurable energy.
The active transducer converts the energy without taking the auxiliary energy supply. And in the passive transducer, the external power source is required for energy conversion. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Skip to content The most crucial difference between the active and passive transducer is that the active transducer does not use any external power source for producing the output, whereas the passive transducer requires the additional energy source for working.
Key Differences between Active and Passive Transducer The transducer which gives the electrical output in the form of voltage and current without any external energy source is known as the active transducer.
The transducer whose physical properties varies because of the input or measurand signal is known as the passive transducer. The active transducer does not require any additional source while the passive transducer requires the additional energy source.
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