Whatis a Sensor? A sensor is a device, module, orsubsystem whose purpose is to detect events or changes in its environment andsend the information to other electronics, frequently a computer processor. Asensor is always used with other electronics.Sensors are mostly used in a lot ofeveryday objects such as lamps, computers, vehicles and a variety of otherobjects.A sensor’s sensitivity indicates howmuch the sensor’s output changes when the input quantity being measured changes.  Whatis an Electromagnetic Sensor? An electromagnetic sensor is anelectronic device used to measure a physical quantity such as loudness,pressure, voltage and power.It can also be used to find out theamount of photons, electrons and neutrons in elements. Some Electromagnetic sensors commonlyused are the Ohmmeter, voltmeter, magnetic compass, metal detectors and radar.  Magnetic sensors also detect changes anddisturbances in a magnetic field like flux, direction and strength.

Magnetic sensorscan also be divided into two categories, those that measure magnetic fields andthose that measure vector components of the field.           Principleof Operations of an Electromagnetic Sensor Magnetic sensors are actuated by thepresence of a magnet. Their main operating principle is based on the use of thereed contacts, whose thin plates are sealed in a glass with inert gases. The presenceof a magnetic field makes the thin plates flex and touch each other causing an electricalcontact.

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The plate’s surface also has been treated with a special material suitablefor low current or high inductive circuits.There are also several ways oftechnologies used to make a magnetic sensor work. Some of these includefluxgate, Hall Effect, nuclear precision, optical pump and superconducting quantuminterference devices each having a unique approach to using magnetic sensors.