Moving Coil Microphone works on Faraday’s law of electromagnetic induction, which states that, “when a conductor moves in a magnetic […]

Carbon microphone consists of a thin moving diaphragm, used as primary (first) transducer, which senses the sound pressure waves and

Hair hygrometer is a type of absorption hygrometer, which works on the principle that, “change in moisture content causes change in

Bourdon tube pressure gauge consists of bourdon tube bent into an arc of circle. Cross-section of the tube is elliptical.

The diaphragm is a thin plate of circular shape clamped firmly around its periphery. Also, it can be called as

Bellows is a longitudinally expansible and collapsible member consisting of several turns (convolutions) or folds. Thus, the bellows is a

lonization is the process of removing an electron from an atom producing a free electron and positively charged ion. Due

In this topic, you study the difference between active and passive transducers.

A Pirani gauge is a device used to measure low pressure or vacuum levels. Fig. 1: Pirani Gauge.

Thermocouple vacuum gauge operates on the principle of thermo-dynamics, which states that, “At low pressures, Thermal conductivity (Heat conductivity) decreases with decreasing