What is transducer? Give the advantages of electrical/electronic transducers. List the transducers used for temperature measurement.
Answers
TRANSDUCER:
A transducer is defined as a device that receives energy from one system and transmits it to another, often in a different form.
Advantages of electrical transducer :
The main advantages of electrical transducer (conversion of physical quantity into electrical quantities) are as follows: Electrical amplification and attenuation can be easily done. Mass-inertia effects are minimised. Effects of friction are minimised. The output can be indicated and recorded remotely at a distance from the sensing medium. The output can be modified to meet the requirements of the indicating or controlling units. The signal magnitude can be related in terms of the voltage current. (The analog signal information can be converted in to pulse or frequency information. Since output can be modified, modulated or amplified at will, the output signal can be easily used for recording on any suitable multichannel recording device.) The signal can be conditioned or mixed to obtain any combination with outputs of similar transducers or control signals. The electrical or electronic system can be controlled with a very small power level. The electrical output can be easily used, transmitted and processed for the purpose of measurement.
Transducers used for temperature measurement :
Four types of transducers are commonly used for making temperature measurements with a DMM: resistance temperature detectors (RTDs), thermistors, IC sensors and thermocouples. Each type has advantages and disadvantages.