【gas transmitter, sensors suppliers】What is the difference between a Sensor and a Transducer? | en.ofweek.com

This is a really good question. In today's world, both these terms are used in various contexts interchangeably. When I started Transducer Engineering in my sophomore year, my professor used to use the term 'sensor' for a particular element in today's class and he would call the same a 'transducer' in tomorrow's class. They both are widely used for the purpose of measurement. Let me start by giving some definitions.

Sensor - As the term suggests, it is a body which reacts to a physical, chemical or biological condition. It senses. It can be considered as a detector.
Transducer - The conversion of energy from one form to another is known as Transduction. A transducer serves for this purpose.

Now why there is confusion is that,
A Sensor can sense in any form(usually electronic) i.e due to some mechanical change, it can react in electrical form. Thus there is a conversion, similar to that of a transducer.
A classic example would be a thermocouple. Or a pressure sensor which might detect pressure and convert it into electric current (3-15psi to 4-20ma)

A Transducer is more than a sensor. It consists of a sensor/actuator along with signal conditioning circuits.
A signal conditioning circuit, by the name is a circuit which conditions the signal so that it is strong enough for further processing. A system might contain many stages before the signal finally reaches its destination to derive meaningful information.
So one way to define is that the output from a sensor may or may not be meaningful i.e most of the times it needs to be conditioned and converted into various other forms. The transducer output is always meaningful.

The output of a motor is meaningful. The output of a loudspeaker is meaningful. They are transducers. A sensor is nothing but just a primary element which senses any physical phenomenon or it gives an indication in any
change of the physical phenomenon.
We can say that Every transducer is also(or has) a sensor but every sensor need not be a transducer. Sometimes it is.

A compass is a simple sensor of magnetic north, wherein the magnetic element in the compass is the transducer

Hope this helps. If there is anything wrong in my explanation, do comment/suggest. I'm happy to learn and happy to help :)

EDIT: Sometimes in a sensor, there is no conversion at all. Ex. Thermometer, where the temperature is sensed and is directly measured. In a transducer there is always a conversion i.e transduction. Ex. RTD, Thermocouple etc where the temperature is sensed and the measurement is made in terms of voltage.

Thus you can say that a SENSOR may or may not have a conversion and it only senses. A TRANSDUCER always involves a conversion and also has signal conditioning involved.

1. sensor: which converts one physicalquantity into electrical
   Transducer which converts one form of energy into
   another form.Example pressure Measurement{BOURDAN TUDE}.
   
   2.sensor just sens the physical quantity(parameter).it does
   not convert to any form.
   transducer=sensor+transduction element.it converts one form
   of energy into another form.
   
   3.sensors: which can respond to a change in physical
   parameter (in its surruonding) and produce a change in a
   physical parameter that can be sensed.eg:when a peizo
   electric crystal is supplied a potential difference then
   its change its dimension.
   
   Transducer:which convert an change in physical parameter
   (involving some form of energy) into some USEFUL energy's
   form.Eg:peizoelectric crystal with electrodes is a
   transducer.
   
   4.A device that measures or detects a real-world condition,
   such as motion, heat or light and converts the condition
   into an analog or digital representation. An optical sensor
   detects the intensity or brightness of light, or the
   intensity of red, green and blue for color systems.
   
   Transducer which convetrs 1 form of energy in another form
   
   5.sensor is nothing but just a primary element which senses
   any physical phenomenon or it gives an indication in any
   change of the physical phenomenon.
   while..
   transducer converts one form of energy to the another form
   of energy.
   EVERY TRANSDUCER IS ALWAYS HAVING A SENSOR BUT EVERY SENSER
   DOESNT NEED TO B A TRANSDUCER.
   
   sensor output is always electric output. but transducer
   output will not be a electric output always. all sensors
   are transducers, but all transducers are not sensor. its
   simple
   
   a sensor is the complete assembly required to detect and communicate a particular event, while a transducer is the element within that assembly which accomplishes only the detection of the event.
   
   A compass is a simple sensor of magnetic north, wherein the magnetic element in the compass is the element .

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