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  LVDT is an acronym for Linear Variable Differential Transformer and is a common type of electromechanical sensor that can convert the rectilinear motion of an object along an axis into a corresponding electrical signal. Common applications that use LVDT are vibration, traction, compression, stress measurement Construction: An LVDT consists of a hollow cylinder with a shaft or push rod that moves freely back and forth inside the hollow cylinder.  The pushrod is connected to a magnetically conducted core.  A primary coil is wrapped around the middle of the hollow cylinder and is energized by constant amplitude AC source, known as the primary excitation  While two secondary coils having an equal number of turns are wrapped on either side of the cylinder at equal distances from the primary coil.    The two secondary coils are connected in the series generating AC output voltage.  A signal conditioning circuit that is housed inside the LVDT structure is...

Piezoelectric Pressure Sensor A piezoelectric sensor is a device that uses the piezoelectric effect to measure changes in pressure, force, strain or temperature by converting them to an electrical charge.  The word piezo is derived from the Greek word piezein which means “Press” or “Stress”. The piezoelectric effect is observed in various materials available in different forms such as crystalline, ceramics, lead-free piezoceramics, semiconductors, and polymers. The  Lead zirconate titanate and quartz crystal are the common types of piezoelectric materials used in piezoelectric pressure sensors.  The piezoelectric material can be referred to as a bidirectional transducer as it generates an internal voltage resulting from an applied pressure or mechanical force due to piezoelectric the effect, contrarily,  it can also generate internal pressure or mechanical strain when an electric field is applied due to the inverse piezoelectric e...

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  Pressure measurement A lot of people may have encountered pressure measurement in the day to day life, such as checking the air pressure in a tire. What most people don’t know is that they are using a pressure sensor.  Before we dive into details about pressure sensors, let’s first understand what is pressure. Pressure is an expression of a force exerted on a surface per unit area. Mathematically, the pressure is represented as: Pressure (P) = Force (F) / Unit Area (A) Units of Pressure A pressure sensor or transducer is used to measure the pressure of liquids or gases and is represented using standard unit “Pascal”.  Pascal = Newton / Meter 2 The pressure sensor monitors the pressure and can simply display it one of the several units used across the globe such as:  Pascal,  bar, PSI (pounds per square inch), atm (atmospheric pressure) Measurement of pressure inside a pipeline or a container in an industrial environment is a challenging task, keeping in mind t...