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Difference between Sensor and Transducer Comparative Chart 

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Difference between Sensor and Transducer Comparative Chart 
Stechies

The questions related to the difference between sensor and transducer have always been a hot favorite with interviewers. Sensor and transducers are physical devices that are used interchangeably; this is because the difference between transducer and sensor is not known by many. Used in electronic gadgets, appliances and devices, transducers and sensors are different from each other in more ways than one. One of the main differences between sensors and transducers is that while both are physical devices, the former senses physical quantities prior to converting them into signals; conversely, the latter is used for converting a specific form of energy into another.

In this article, we aim to define transducer and sensor and bring out the points of distinction between sensors and transducers via a chart depicting sensor vs transducer pointers in a simple manner. Read on for more.

Transducer vs Sensor

Basis of difference

Sensor

Transducer

Meaning

A sensor is designed to sense any physical change occurring in the surrounding. It is responsible for converting the change into a readable quantity.

A transducer actuates to transform energy from a given form to another.

Comprises of

Sensor has no other component except itself.

Signal conditioning and sensor form parts of the transducer.

Functionality

Detects changes and generates corresponding electrical signals.

Responsible for converting energy into a different form.

Applications

Magnetic sensor, Accelerometer sensor, Proximity sensor, Light sensor, etc.

Thermistor, Thermocouple, Potentiometer, etc.

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Sensor suggests a user’s capacity to receive information regarding physical quantities that are not perceivable through human senses as these quantities are of subliminal nature or extremely minute.

Transducer suggests that the quantities sent to input and output devices are not the same.

Dependency

A sensor may not be a transducer.

A transducer will always contain a sensor.

Complexity of performance

In comparison to a transducer, a sensor is less complicated in its performance. It directly transforms a given physical quantity into a different physical quantity (for example, resistance, capacitance, etc.).

A transducer serves to be a more complicated device as it is designed to transform the physical quantity that is provided to the input part into another output signal (voltage, current, etc.). Thus, a transducer fuses the conditioning system and sensing elements in order to provide output signals that are proportional to input quantities.

Feedback

A sensor measures a physical quantity only and cannot give a feedback to the desired system on its own.

A transducer is capable of converting between different forms of energy. It is generally used for providing feedback to a desired system through the output device after due processing takes place in the signal conditioning unit.

What is Sensor?

As per the definition of sensor, it is a physical device that is useful for measuring the changes in the surroundings after measuring their physical quantities (light, heat, sound, etc.) and transforming them into signals (current, voltage, etc.) that can be easily read by users. Sensors provide accurate readings if the calibration is done properly. For instance, mercury present in a thermometer transforms the body temperature change into easily measured reading that can be sighted through a calibrated glass tube; it does so because of its expansion and contraction courtesy temperature changes. Similarly,

  • Motion sensors are applied in home security systems as well as automation door systems.
  • Photosensor sense changes in infrared/ultraviolet light.
  • Accelerometer sensors are utilized in the mobile for the purpose of detecting screen rotations.
  • The basic input unit to a sensor is in the form of a transducer (generally referred to as the sensing element). However, a sensor is capable of including advanced circuitry for making it easy for users to deal with the interface connected to the end application.

What is Transducers?

As per the definition of transducer, it is a physical device that alters the physical attributes of given non-electrical signals to form electrical signal that can be measured easily. This process of conversion of energy in the transducer is referred to as transduction. Transduction takes two steps to complete; firstly, it senses signals and then strengthens them for the cause of further processing.

  • Transducers comprise of three main components; these are signal conditioning/processing device, input device and the output device.
  • The input devices are designed to accept and measure quantities and send them as proportional analogue signals to processing/ conditioning devices.
  • The conditioning device then modifies, filters and sends the signal to output devices in an easily-understandable format.
  • A transducer is also capable of converting electrical signals into physical quantities for the sake of creating an actuator. As soon as this process takes place the transducer ceases to be a sensor. For instance, a piezoelectric transducer is capable of being used for sensing and/or actuation purposes.

Key difference between transducer and sensor

The following differences between sensor and transducer will help you understand these physical devices in a better way.

  • The physical changes are sensed by the sensor in the surrounding and intimated in the form of readable quantities to users. On the other hand, a transducer is used for transforming a certain form of energy into a different format.
  • The sensor does not have any other component for sensing/ processing purpose while a sensor and signal conditioning unit are used for making a transducer work.
  • The sensor primarily functions to sense physical changes in the environment; on the other hand, a transducer is used for converting physical quantities into electrical signals.
  • The examples of sensors are barometer, gyroscope, accelerometer, etc. The thermocouple, thermistor, antennas, etc. are examples of transducers.

Conclusion

Sensors and transducers are used for measuring physical quantities such as temperature, light, displacement, heat, etc. These physical devices are quite diverse in nature and functionality and should not be confused in any way. We have tried to touch upon the various points of difference between sensors and transducers in this article. In case you have any further queries or inputs then please drop us a line in the comments section below- we shall get back to you at the earliest.


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