A transducer is a system that converts a physical chemical or any natural quantity into a desired form of energy as an indicator.
The first stage of a transducer is the sensor which utilizes a certain physical phenomena to tranfer the quantity we want to measure into another measurable quantity.
for example resistive temperature sensors employs the fact that some certain materials experience decrease in resistance versus an increase in temperature. This sensor would be placed in an electrical network where subjected to certain voltage. Now, the current passing this sensor "resistor" will indicate the resistance value according to Kirchhoff's law and consequently indicate the surrounding temperature.
Other devices such as amplifiers and analog to digital converters with certain configuration can make a visual means to display these information.
A transducer converts one variable into another variable that is easier to measure.
Consider a strain gage transducer. There are materials that change their electrical resistance when stressed. If a constant current passes through such an element, the voltage across it will depend on the resistance, which depends on the stress. So, one can make a transducer that converts load to voltage.
Similarly for other process parameters like pressure, flow etc.
An example of an electromagnetic transducer is an antenna. Once calibrated, it can be used to measure radio frequency emissions from a device, commonly to see if it passes government limits. An example of an electrochemical transducer is a carbon monoxide sensor. These are used in homes, to warn of defective furnaces.
There are various definitions for "transducer", however the most general being "Any device that converts one form of energy into another form of energy, specifically when one of the quantities is electrical." a fan would certainly fall into this definition. It converts electrical energy into kinetic energy in the form of spinning blades and moving air.
Back in the olden days, for instance, they were mechanical gizmos that moved a rheostat in response to a movement of a physical sensor, like a pressure sensor.
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A transducer is a system that converts a physical chemical or any natural quantity into a desired form of energy as an indicator.
The first stage of a transducer is the sensor which utilizes a certain physical phenomena to tranfer the quantity we want to measure into another measurable quantity.
for example resistive temperature sensors employs the fact that some certain materials experience decrease in resistance versus an increase in temperature. This sensor would be placed in an electrical network where subjected to certain voltage. Now, the current passing this sensor "resistor" will indicate the resistance value according to Kirchhoff's law and consequently indicate the surrounding temperature.
Other devices such as amplifiers and analog to digital converters with certain configuration can make a visual means to display these information.
A transducer converts one variable into another variable that is easier to measure.
Consider a strain gage transducer. There are materials that change their electrical resistance when stressed. If a constant current passes through such an element, the voltage across it will depend on the resistance, which depends on the stress. So, one can make a transducer that converts load to voltage.
Similarly for other process parameters like pressure, flow etc.
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An example of an electromagnetic transducer is an antenna. Once calibrated, it can be used to measure radio frequency emissions from a device, commonly to see if it passes government limits. An example of an electrochemical transducer is a carbon monoxide sensor. These are used in homes, to warn of defective furnaces.
There are various definitions for "transducer", however the most general being "Any device that converts one form of energy into another form of energy, specifically when one of the quantities is electrical." a fan would certainly fall into this definition. It converts electrical energy into kinetic energy in the form of spinning blades and moving air.
Depends a lot on the physical quantity... and the construction of the transducer.
a transducer detects change in any physical quantity and converts to a corresponding change in electrical signals.
eg. piezoelectric, photo diodes, blah
Back in the olden days, for instance, they were mechanical gizmos that moved a rheostat in response to a movement of a physical sensor, like a pressure sensor.