Author name: Abhay Krishnan

The Thermistor or simply Thermally Sensitive Resistor is a temperature sensor that works on the principle of varying resistance with temperature. They are made of semiconducting materials. The circuit symbol of the thermistor is shown in the figure. Construction of Thermistor A thermistor is made of oxides of metals such as Nickel, Manganese, Cobalt, Copper, […]

We know that the resistance of metallic conductors increases with temperature. Thermal sensors using this property of metallic conductors are called Resistance Temperature Detector(RTD). Construction of RTD The resistance temperature detector is constructed by wounding the resistance wire on a mica base. The wire is wound like a helical coil on the support to reduce

Temperature sensors are devices used to measure temperature that is generated by a system. It allows us to detect any physical change to that temperature by producing some output. Classification of Temperature Sensors Different types of Temperature sensors are available depending upon their applications. Two basic physical types of Temperature Sensors are Contact Temperature Sensors.

A capacitive transducer is a passive transducer that works on the principle of variable capacitances. It is used to measure physical quantities such as displacement, pressure, etc. Construction of capacitive transducer A capacitive transducer contains two conducting parallel metal plates separated by a dielectric medium. Working Principle of capacitive transducer The capacitance between these two

RVDT (Rotary Variable Differential Transformer) is a passive transducer, that works on the principle of mutual induction. It is used to measure the angular displacement. The design of RVDT is similar to LVDT, except for the design of the core. Read More: LVDT Construction,Principle and Advantages. Construction of RVDT RVDT consists of one primary coil

LVDT (Linear Variable Differential Transformer) is a passive transducer, that works on the principle of mutual induction and can be used to measure displacement, pressure, and force. Construction of LVDT LVDT consists of one primary coil and two secondary coils wounded on a cylindrical core. The core is made up of a ferromagnetic material such

An inductive transducer works on the basic principle of change in inductance due to any change in the measurand. A change in measurand changes the flux and this change in flux changes the inductance. This change in inductance can be calibrated in terms of measurand. Inductive transducers works on one of the following principles Change

A Strain gauge(resistance strain gauge) is an important type of resistance transducer whose resistance varies with applied force. It can be used to convert force, pressure, tension into a change in electrical resistance. The applied strain can be measured by this change in resistance. Basic Principle We know that the resistance of a conductor is

A potentiometer is a device where a resistive wire is wound on an insulating core provided with a sliding contact. It can be excited with a DC or AC voltage source. The slider movement can be translational (straight) rotational or a combination of both. Schematic diagram of a resistive potentiometer is shown in figure. Here,

Resistance transducer is one of the simplest and important groups of transducers. These are transducers whose electrical resistance is varied in accordance with the input quantity (measurand). Quantities like displacement, acceleration, force, pressure, temperature etc. can be transduced using this type of transducers. Basic Principle of Resistance Transducer The basic principle of a resistance transducer