Hello, friends, I hope you all are doing great. In today’s tutorial, we will discuss the Difference Between Active & Passive Transducer. there is no need of an exterior power supply for the production of output in the active transducer while for passive transducer exterior power supply is required.
The physical quantities such as pressure, displacement, temperature, can not measure easily. To measure these values any instrument is needed that transforms them into the measurable form. For these conversion devices used are called a transducer. In today’s post, we will have a detailed look at both active and passive transducers with the details and find their differences. So let’s get started with Difference Between Active & Passive Transducer.
Difference Between Active & Passive Transducer
Active Transducer
- It is a type of transducer that transforms such signal in the electrical that is nonelectric.
- The example of nonelectrical parameters are temperature, pressure, light, etc
- It does not need any exterior energy source for operation.
- Normally three main types of active transducer piezo electric, thermal and photo.
- It working operation based on the use of power from the measured quantity.
- Its physical design is simple than the passive transducer.
- Its resolution is less.
- It is such sensitive very less change can measure throguh it
- Its examples are tacho generator, Thermocouple, Photovoltaic cell.
- It generated an output signal from the signal to be measured.
Passive Transducer
- The type of transducer whose interior factors such as capacitance, resistance, and inductances vary with the change of input is called a passive transducer.
- Its main types are resistive, capacitive, and inductive.
- For operation, it needed an extra power source.
- LVDT is a type of transducer that generates the electric signal according to the change in position of the body.
- LVDT is like a transformer having a core that can be change postion
- It generated output with the use of an exterior signal.
- LVDT used to measure the displacement used in satellite
- Examples of passive transducers are Thermistor, Differential transformer, Photomultiplier tube, Photovoltaic cell.
- Its working principle depends on that it uses exterior power to vary the exterior parameters of the transducer.
- Its design is complicated than the active transducer.
- LDR is also a passive transducer that works as a light detecting device.
- Ldr employed in-camera for light detection
- The potentiometer is a transducer that used to measure the rotational displacement.
- Reostate is a transducer used to finds linear displacement
- Its resolution is larger than the active transducer.
Advantages of Active Transducers
- The active transducers operate separately, so they are easy to construct.
- These transducers come with features of direct conversion of measured value into electrical signal.
- It is lower cost than passive transducers, easy to make, and low cost.
Disadvantages of Active Transducers
- Their features produce an output signal that is proportional to measured parameters. Active transducers come with lower resolution than passive transducers.
- It is important to check that the accuracy of active transducers is lower than passive.
Advantages of Passive Transducers
- Passive transducers have features of high product accuracy since they have features to sense small changes in physical quantities.
- These transducers measure minor changes in output and are used for high accuracy values.
Disadvantages of Passive Transducers
- As passive transducers needed an external power supply, they have a complex design. Since they are using extra circuits and power control for their work, they are more complex designs than active transducers.
Active Transducer vs. Passive Transducer
Active Transducer
- This transducer does not need an external power supply for producing an output signal called an active transducer.
- Active transducers draw energy needed for working directly from physicals quaintly measured.
- It comes with a simple design and circuit.
- It does not use more power than other transducers.
- It generated an output signal of low amplitude. So it needed amplification.
- It produces output in voltage or current form.
- This transducer is also called aself-generating transducer.
- The main examples of active transducers are thermocouples, tachogenerators, piezoelectric crystals, photovoltaic cells, etc.
Passive Transducer
- This transducer needs more power supply for working.
- It uses energy from working with an external power supply.
- The design and circuit are complicated.
- It uses more power supply. It produces output signal of high amplitude so it not uses amplification of output signal.
- Passive transducers generated output when a chance in the passive circuit occurred for resistance, inductance, and capacitance.
- Passive transducers are also called externally powered transducers.
- The main examples of passive transducers are differential transformers, thermistors, photomultiplier tubes, etc.
FAQs
What are common examples of active transducers?
The active transducers has its own power supply such as common examples are thermocouple and piezoelectric crystals.
Are passive transducers accurate?
Passive transducers are high accurate than active transducers since passive transducers not needed external power supply to work since they trasnform one type of energy into another form. They measures small changes of physical quantities
Which type of transducer is good?
Active transducers comes with low manufacturing cost since their design is simple and not needed any power supply
What are the applications of active and passive transducers?
Active transducers best where simple and low cost options are used and passive transducers used for system where high accuracy needed.
That is all about the difference between active and passive transducer. If you have any query ask in comments. Thanks for reading. Have a good day.
