Resistive Transducer (Resistance Transducer)
Table of Contents
The term “resistive transducer” refers to a transducer whose resistance varies as a result of environmental factors. The ac or dc measuring devices measure the change in resistance. Temperature, displacement, vibration, and other physical quantities are measured using resistive transducers.
It can be challenging to measure physical quantities. The physical quantities are transformed by the resistive transducer into variable resistance that meters can quickly measure. In industrial applications, the process of variation in resistance is frequently used. The Resistance Transducer has the ability to function as both a primary and a secondary transducer. Physical quantities are converted from a mechanical signal by the primary transducer into an electrical signal by the secondary transducer.
Resistive transducer example – The diagram below depicts the sliding resistive transducer’s circuit.On the resistive element are the sliding contacts. The slider pans across the screen. The resistive element of the transducer, which is measured by voltage source E, changes in value as the slider is moved.
An electrical signal is created from the slider’s displacement.
Working Principle of Resistive Transducer
The resistive transducer element operates under the premise that resistance is directly proportional to conductor length and inversely proportional to conductor area.
Where R – resistance in ohms.
A – cross-section area of the conductor in meter square.
L – Length of the conductor in meter square.
ρ – the resistivity of the conductor in materials in ohm meter.
The variation of the length, area, and resistivity of the metal is taken into account when designing the Resistance Transducer.
Advantages of Resistive Transducer
The following are the advantages of the Resistance Transducer.
- Fast response is provided by the resistive transducer.
- Variable resistance can be measured using either current or voltage, AC or DC.
- It has a wide range of resistance and comes in a variety of sizes.
The following are the applications of the Resistance Transducer.
- Strain gauges – When the strain is applied to their semiconductor material, the resistance changes. So The measurement of pressure, force-displacement, etc. is done using this characteristic of metals.
- Potentiometer – So Examples of resistive transducers are translation and rotatory potentiometers. The resistance of their conductor, which is used to measure displacement, varies with the variation in their lengths.
- Thermistor – It operates on the tenet that the temperature affects how the thermistor material’s temperature coefficient changes. The temperature coefficient of the thermistor is negative. So The inverse relationship between resistance and temperature is indicated by a negative temperature coefficient.
- Resistance Thermometer – Temperature changes cause changes in the metals’ resistance. So Temperature measurements are based on this conductor property.