Inductive displacement sensor

Inductive Displacement Sensors and Linear Gaging Sensors linear variable differential transformer principle Micro-Epsilon transSENSOR... 

Figure 2.10 illustrates different types of inductive displacement sensor (a) self-inductance, (b) mutual inductance and (c) differential transformer. In most cases a mutual inductance system can be converted into a self-inductance system by series or parallel connections of the coils. The mutual inductance device (figure 2.10(b)) becomes a self-inductance device (figure 2.10(a)) when terminals b and c are connected. 

Figure 2.10 Inductive displacement sensors (a) self-inductance (two examples) (b) mutual inductance (two examples) (c) differential transformer. (From Peura R A and Webster J G Basic sensors and principles in Medical Instrumentation Application and Design, 2nd edition, edited by J G Webster, copyright (5) 1992 Houghton Mifflin Co., Boston.)...

An inductive displacement sensor measures the axial displacement of the ring with regard to the cone. When the axial force is constant, this shift corresponds to the wear in the friction surfaces. The sensors specially developed for this test rig measure... 

Displacement sensors can be based on measurements of capacitance as well as inductance. The fundamental principle of operation is the capacitance of a parallel plate capacitor as given by... 

Stimulus mechanical measurands Position and displacement (dimension) Absolute (for position) and relative (for displacement), odometers, strain and displacement sensors Optical, capacitive, resistive, inductive. Hall, magnetostrictive effect... 

Since some of the operational research reactors were constructed more than 30 years ago, it is recommend that surveillance instruments be installed to monitor in primary coolant pump. Inductive accelerometers and displacement sensors are widely used in nuclear power plants, and in the industry in general, and have been proven to be reliable. By monitoring piunp vibration, one can anticipate failure conditions and make the necessary repairs well in advance. 

Inductive Potentiometric Displacement Measurement distributed electromagnetic parameters Micro-Epsilon vipSENSOR industrial use, productions plants, OEM - sensor... 

The two secondary windings are connected in series opposition so that the output voltage is the difference of the voltages in the secondary windings (i.e. V0 = V, - V2, Vt > V2). A ferromagnetic core moves inside the primary coil and thus varies the mutual inductance between the primary and secondary coils which in turn varies the secondary voltages. The displacement of the pressure sensor (capsule, bellows or... 

Note the difference in operation of the inductive transducer (Fig. 6.12) where the core of an inductor is displaced linearly by a distance xs along the axis of the coil and the reluctive sensor (Fig. 6.14) which responds to a small displacement x of the armature.]... 

The operation of proximity sensors can be based on a wide range of principles, including capacitance, induction, Hall and magnetic effects variable reluctance, linear variable differential transformer (LVDT), variable resistor mechanical and electromechanical limit switches optical, photoelectric, or fiber-optic sensors laser-based distance, dimension, or thickness sensors air gap sensors ultrasonic and displacement transducers. Their detection ranges vary from micrometers to meters, and their applications include the measurement of position, displacement, proximity, or operational limits in controlling moving components of valves and dampers. Either linear or angular position can be measured ... 

Inductive sensors are devices that transduce the change in the measured physical parameter, that is in the form of a mechanical displacement, into variations of a coil s inductance. The inductance, L, of a coil can be expressed as ... 

Figure 2.10(b) illustrates a mutual-inductance sensor which employs two separate coils and uses the variation in their mutual magnetic coupling to measure displacement. These devices can be used to measure cardiac dimensions, monitor infant respiration and ascertain arterial diameters [2]. 

Inductive sensors for displacement measurement are based on the fact that inductance of a cod, L = n Gfi, where n = number of turns of coil, G = form factor, and ju = effective permeability of the medium. Each of these three parameters can be changed by mechanical displacement. Linear variable differential transformer inductive sensors show good linearity over a large range of displacement, high resolution, and better sensitivity compared with strain gauge [11]. 

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