Errors in Platinum Resistance Thermometers To fully understand the accuracy of a temperature measurement, it is imperative that all the sources of errors are understood and where possible quantified. Accuracy is not a statement of the correctness of a temperature sensor independent of its system. It is the total accuracy of the sensor system, and […]
Temperature, the most frequently measured process variable on the planet, can be measured in various ways. Many temperature measurement devices incorporate a resistive material that when exposed to an environment, the resistance will change in response to the temperature in a predictable manner. This style of sensor is referred to as a resistance temperature detector
Strain Gage Load Cell The strain-gage load cell consists of a structure that elastically deforms when subjected to a force and a strain-gage network that produces an electric signal proportional to this deformation. Examples of this are beam and ring types of load cells. Strain Gages Strain gages use a length of gage wire to
Piezoresistive Pressure Sensors Piezoresistive sensors (also known as strain-gage sensors) are the most common type of pressure sensor in use today. Piezoresistive effect refers to a change in the electric resistance of a material when stresses or strains are applied. Piezoresistive materials can be used to realize strain gages that, when incorporated into diaphragms, are
Capacitive humidity sensors and capacitive moisture sensors are mostly based on the changes in the permittivity of the dielectric material. The permittivity of atmospheric air, some gases, and many solid materials are functions of their moisture contents and their temperature. The main advantage of this type of sensor is that a relatively small change in
Hi friends, in this article, I am going to discuss about lvdt working principle, lvdt advantages and disadvantages. My article will increase your knowledge, I hope so. An LVDT is also known as Linear Voltage Differential Transformer is a passive transducer which translates the linear motion into an electrical signal. It consists of
The Wiegand effect relates to the nonlinear magnetization behavior of a Wiegand wire that switches its polarity under a strong magnetic field. A Wiegand wire is a low-carbon Vicalloy (a family of cobalt–iron–vanadium alloys) wire, typically consisting of 52% cobalt, 37.37% iron, 10% vanadium, 0.4% manganese, 0.2% silicon, and only 0.03% carbon. The features of
The Barkhausen effect relates magnetism to acoustics. In 1919, a German scientist Heinrich Barkhausen found that whenever he moved a magnet close to an iron-cored wire, an audible roaring sound (called Barkhausen noise or Barkhausen emission) was heard through an amplified speaker. The sound reflects a sudden (instead of a smooth or gradual) shifting or
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Magnetostrictive Sensor Working Principle The magnetostrictive effect relates a material’s elastic state to its magnetic state. Nearly all FM materials such as iron, nickel, cobalt, and their alloy, exhibit a change in size and shape resulting from magnetization change. This effect is known as Joule effect. Joule effect can be understood by considering an FM
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When a current flows through a thin flat conductor placed in a magnetic field, the magnetic field exerts a transverse force (i.e., Lorentz force) on the moving charge carriers and pushes them to one side of the conductor. The charge then builds up and forms a measurable voltage between the two sides of the conductor.