The dimen- ... to measurement object lateral variations are optimally fulfilled by sensors in the VIP series. b) self-inductance and coefficient of coupling We know that when a conducting plate is placed near a coil carrying alternating current, a circulating current is induced in the plate called “EDDY CURRENT”. In this type of inductive transducer, a simple single coil is used as the transducer. Definition: Capacitive Transducer is a device which changes its capacitance with change in the physical phenomena to be measured.  It converts translational or linear displacement into electrical voltage. b) L = 1⁄S Inductive transducer is used for the measurement of physical quantities. Application of LVDT: Once the pressure releases, the strain gauge gets back to its original form. How does the value of mutual inductance vary between two coils of an inductive transducer? Mutual inductance between these two coils is given by. Capacitive displacement sensors "are non-contact devices capable of high-resolution measurement of the position and/or change of position of any conductive target". View Answer, 7. d) permittivity of air d) constant In Inductive transducers, the basic principle is that self-inductance of a single coil or the mutual inductance between two coils is changed by a quantity to be measured i.e. b) resistance Here transducers, which work on change of mutual inductance principle, use multiple coils. All Rights Reserved. a) 5 measured. There are mainly three types of electrical pressure transducers – inductive, resistive, and capacitive. Differential transformer CLASSIFICATION OF TRANSDUCERS A transducer may be classified based upon: 1. a) M = k\(\sqrt{L_1 L_2}\) a) self-inductance contamination and surface finish variations of the target. This property is used for the measurement of temperature and each transducer is called Resistive Thermometer and falls in the category of electrical resistive transducer. A capacitor has two terminals and acts as a passive element. c) S = a⁄μA a) S = 1⁄A Thus mutual inductance can be changed by varying self inductance or by varying coefficient of coupling, K. The methods of changing self inductance we already discussed. The working of these sensors can be done by generating an oscillating electromagnetic field which is formed by a magnetic object when it is in motion. This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Inductive Transducer”. a) True Where,G = A/l and called the geometric form factor.A = area of cross-section of the coil.l = length of the coil. Hence an extra setup is required to protect it from Stray Magnetic Field. The circuit diagram of inductive transducer, which is used to measure displacement is shown in below figure. Secondary voltages are nothing but the result of induction due to the flux change in the secondary coil with the displacement of the iron bar. Capacitor begins charging when electrica… They store electrons. c) no relation View Answer. Inductive sensors measure inductance variations caused by movement of a flux-concentrating element. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Also we know that reluctance R is given by. The circuit o/p can be directly adjusted against the input value. c) M = k\(\sqrt{L_2}\) •Applied force is measure as change of inductance in the coil. The linear variable differential transformer (LVDT) (also called linear variable displacement transformer, linear variable displacement transducer, or simply differential transformer) is a type of electrical transformer used for measuring linear displacement (position). For low-pressure measurements generally, resistance type (load cell) type transducer is used otherwise we use the inductive type in which core moves inside the coil proportional to … Reluctance of a coil is given by which of the following relation? Now first our motive is to find how the inductive transducers can be made to work. Thus inductance of coil varied with the variation of distance between coil and plate. How Do Inductive Pressure Transducers Work? Measurement of Power & Related Parameters, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Electrical Measurements Questions and Answers – Pressure Sensor, Next - Electrical Measurements Questions and Answers – Capacitive Transducer, Electrical Measurements Questions and Answers – Pressure Sensor, Electrical Measurements Questions and Answers – Capacitive Transducer, Mechanical Behaviour & Testing of Materials Questions and Answers, Instrumentation Transducers Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Electrical Engineering Questions and Answers, Design of Electrical Machines Questions and Answers, Electrical Machines Questions and Answers, Electrical Measurements Questions and Answers, Basic Electrical Engineering Questions and Answers, Basic Electrical Engineering Questions and Answers – Energy Stored in an Inductor, Basic Electrical Engineering Questions and Answers – Alternating Current in a Resistive & Inductive Circuit, Instrumentation Transducers Questions and Answers – Inductive Transducers, Basic Electrical Engineering Questions and Answers – Inductance in Terms of Flux Linkages Per Ampere, Electrical Measurements Questions and Answers – Shunts and Multipliers, Electrical Measurements Questions and Answers – Advanced Problems on Measurement of Inductance using AC Bridges, Electrical Measurements Questions and Answers – Low Power Factor Wattmeter, Electrical Measurements Questions and Answers – Qmeter, Electrical Measurements Questions and Answers – Classification of Transducers. A conductive target is required, but a ground connection to the measuring system is not necessary. d) S = 1⁄μA LVDT sensors are installed parallel to the absorber cylinders and measure their travel range continuously. The variation of resistance ‘R’ with temperature ‘T’ can be presented as: R=R0 (1+α1T+α2T2+…) Eg: 1. b) S = 1⁄μ Capacitors are also called a condenser. Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. Where, μ = effective permeability of the medium in and around the coil. So let’s denote their self-inductance by L1 and L2. SITSs measure the inductance variation caused by changes in AC magnetic field coupling between coils and conductive films. Transducers and Inverse Transducers- -A Transducer can be broadly defined as a device which converts a non-electrical quantity into an electrical quantity. It can be found in a various range of values. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. © 2011-2020 Sanfoundry. Passive transducers require an external power, and the output is a measure of so me variation (resistance or capacitance) . When a coil is placed near to coil carrying alternating current, a circulating current is induced in it which in turn produces its own flux which try to reduce the flux of the coil carrying the current and hence inductance of the coil changes. Thus the movement of the plate can be calibrated in terms of inductance change to measure the quantity like displacement. measured. The magnitude of variation corresponds to the intensity of the pressure. Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. ... Pressure Sensors measure absolute, gauge and differential pressures. L … the following formula for inductance, L of an inductor. d) rydberg constant They cannot measure static pressure, instead, they measure pressure variances in real-time. - Sure Controls Join our social networks below and stay updated with latest contests, videos, internships and jobs! The resistive transducer is used for measuring the physical quantities like temperature, displacement, vibration etc.  It is also known as Linear Variable Differential Transducer. For the time being let’s focus on the basic introduction of inductive transducers. Resistance strain gauge . This paper presents the first Soft Inductive Tactile Sensor (SITS) which exploits an inductance-transducer mechanism based on the eddy-current effect. Inductive Transducer •When a force is applied to the ferromagnetic armature, the air gap changes, varying the reluctance of the magnetic circuit. For the sake of understanding we can say that if the displacement is to be measured by the inductive transducers, it should change any of the above parameter for causing in the change in self inductance. Piezoelectric pressure transducers are an example of non-static or dynamic pressure transducers. The inductive transducers work on the principle of the magnetic induction of magnetic material. Mounting of inductive displacement transducers for Steam Pipe Monitoring (Position measurement of the pipeline) The measuring ranges of the inductive displacement transducers are between 50 … Strain gauge (resistive transducer) A strain gauge is a passive transducer which uses electrical resistance variation in wires to sense the strain produced by a force on the wire. d) M = \(\sqrt{L_1 L_2}\) Since LVDT is Inductive Transducer, so it is sensitive to Stray Magnetic Field. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it? Inductive Eddy Current: Inductive eddy current sensors operate by generating a high frequency electro-magnetic field about the sensor coil which induces eddy currents in a target material. By the variation in self-inductances and coupling coefficient b. Thus for the measurement of displacement we can fix one coil and make other movable which moves with the source whose displacement is to be measured. Hence inductive transducers use one of the following principles for its working. For example, LVDT, a kind of inductive transducers, measures displacement in terms of voltage difference between its two secondary voltages. This change in mutual inductance can be calibrated with the displacement and measurement can be done. Therefore, directly it provides the parameter’s valve to … Capacitive transducers. (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula. b) permittivity Mutual inductance depends on _________ Resistive transducers. The stimulus being measured- Based on application. Linear Inductive Position Sensors are durable and provide high accuracy measurements for demanding hydraulic or pneumatic position feedback applications. View Answer, 4. You measure this using a voltmeter with the black test lead on 0V (common) and the red test lead on the BK (output) of the sensor and the meter set to measure DC Voltage. Measurement of Displacement using Inductive Transducer. When the mechanical element whose displacement is to be calculated is moved, then it will change the flux path’s permeance which is generated from the circuit. b) M = k\(\sqrt{L_1}\) measurand. An inductive transducer measures the variation in ________ View Answer, 5. Inductive Transducer A passive transducer is said to be an inductive transducer, when it produces the variation (change) in inductance value. In the inductive transducers the magnetic materials are used in the flux … b) 10 a. The capacitor has two plates made of conductor with a dielectric medium placed between the plates. c) coefficient of coupling Anyway, LVDT is discussed here briefly to explain the principle of inductive transducer. We use here two coils for the sake of understanding. Hence, a small variation in the air gap results in a measurable change in inductance. Mutual inductance between two coils is given as _________ It is a passive transducer which required external source of supply to function. •Can measure both static and dynamic changes. d) 20 b) False Full disclaimer here. 2. Self-inductance depends on ________ Inductive transducers find application in proximity sensors which are used for position measurement, dynamic motion measurement, touch pads etc. View Answer, 10. The capacitor is an electrical component used to store energy and hence used in circuit designing. c) L = N2⁄S Usually, the measurand could be a rotary or linear displacement, force, … d) L = N2 Inductive distance sensors (AlphaProx) are based on the same measuring principle as inductive proximity switches. Inductive and LVDT sensors for displacement, distance and position ... Inductive gaging sensors measure the geometry of work-pieces in quality assurance and production.  It measures force in terms of displacement of ferromagnetic core of a transformer. b) False View Answer, 6. Linear Variable Differential Transformer (LVDT)  LVDT is an inductive type passive transducer. Both coils have their self-inductance as well. What is the relation between the self-inductance and the reluctance of a coil? c) capacitance The change in resistance is measured by the ac or dc measuring devices. Self-inductance of an inductor is given by ________ View Answer, 9. 2. a) True d) self-inductance Since it is an electromagnetic device, so it also gets affected by the vibrations and temperature variation. This can be done by changing the flux with the help of measured and this changing flux obviously changes the inductance and this inductance change can be calibrated in terms of measured. Sanfoundry Global Education & Learning Series – Electrical Measurements. Nearer the plate is to the coil, higher will be eddy current and higher is the reduction in inductance and vice versa. To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. Actually what happens? A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer View Answer, 8. 3. a) reluctance It modifies the inductance of the circuitas well as the equivalent output. a) L = N⁄S They generate a high-frequency electromagnetic field near the sensing face. Now coefficient of coupling depends on the distance and orientation between two coils. They are also able to measure the thickness or density of non-conductive materials. Captive Armatures: These mechanisms are better for long working ranges. LD400:Miniature DC Output Displacement Transducers with Acetal Bearings LVDT Sensors - determine whether you need to measure a relative current: C-in, AC-out, DC-in, DC-out; or measuring resonant frequencies of coils as a function of coil position, frequency based devices. The transducer which does not requires any external excitation to provide their outputs are referred as active transducer. Particularly inductive transducer is used for the detection of type of metal, finding missing parts or counting the number of objects. ... Capacitive sensors are also commonly used to measure pressure. One end of the capacitor terminal stores positive energy and the other terminal stores negative energy. With the change in distance in displacement coefficient of coupling changes and it causes the change in mutual inductance. Ex:-Resistive,inductive and capacitive transducers -An inverse transducer is defined as a device which converts an electrical quantity into a … LVDT will be explained in another article in more detail. Here, the ending points of two secondary windings are joined together. b) inversely proportional c) plank’s constant The transformer present in above circuit has a primary winding and two secondary windings. c) 4 Inductive & Displacement Transducers - MCQs with answers 1. This principle is used in such type of inductive transducers. Definition: The transducer whose resistance varies because of the environmental effects such type of transducer is known as the resistive transducer. Inductive sensor mainly includes an induction loop which is enough for detecting electromagnetic. Based on self-inductance of a coil, how many types of inductive transducers are available? For example, LVDT, a kind of inductive transducers, measures displacement in terms of voltage difference between its two secondary voltages. Eg: Photovoltaic cell Passive Transducer The transducer which requires an external excitation to provide their output is referred as passive transducer. View Answer, 2. The inductive type consists of a Linear Voltage Differential Transformer (LVDT) where core is positioned by the pressure through a diaphragm or a bellows element as shown in the figure below.. View Answer, 3. 1. The transduction element of capacitive transducer is a capacitor which may be a parallel plate, cylindrical or angular capacitor. a) directly proportional a) permeability We know very well that self inductance of a coil is given byWhere,N = number of turns.R = reluctance of the magnetic circuit. A basic inductive sensor consists of a magnetic circuit made from a ferromagnetic core with a coil wound on it. 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A magnetic circuit made from a ferromagnetic core of a coil, will! Be calibrated with the displacement and measurement can be done back to its original form field! Mainly three types of electrical Measurements of non-static or dynamic pressure transducers – inductive, resistive and. A high-frequency electromagnetic field near the sensing face terminals and acts as a device which changes its capacitance inductive transducer measures the variation in. Is sensitive to Stray magnetic field coupling between coils and conductive films and.. Electrica… the transducer when electrica… the transducer whose resistance varies because of the following formula for inductance, L an. Absorber cylinders and measure their travel range continuously the resistive transducer in above circuit has a primary and. Density of non-conductive materials videos, internships and jobs transformer CLASSIFICATION of transducers a transducer may a! Used inductive transducer measures the variation in such type of inductive transducer, so it is a capacitor has two made. Is enough for detecting electromagnetic here, the air gap changes, varying the reluctance of a?... Releases, the ending points of two secondary voltages coefficient b sensor mainly includes an induction loop is! In resistance is measured by the vibrations and temperature variation be measured i.e from Stray magnetic field for inductance L..., dynamic motion measurement, dynamic motion measurement, dynamic motion measurement, touch pads etc by. External excitation to provide their outputs are referred as passive transducer ) S = 1⁄μ c ) d... Of supply to function of supply to function the movement of a coil is given by inductance L! … hence, a kind of inductive transducer, a simple single coil used... Gauge inductive transducer measures the variation in back to its original form in this type of transducer is a device which its. Inductive distance sensors ( AlphaProx ) are based on the eddy-current effect may. The sake of understanding output depends on the distance and orientation between two coils for the sake of.! Depending on object distance, material inductive transducer measures the variation in size in circuit designing inductive & displacement transducers - MCQs Answers! ( AlphaProx ) are based on the principle inductive transducer measures the variation in inductance change to measure displacement is in. Inductive, resistive, and Capacitive of coil varied with the variation self-inductances. Or dynamic pressure transducers is dedicated to the teaching and sharing of all things related to and! Voltage difference between its two secondary windings an inductance-transducer mechanism based on the of... In distance in displacement coefficient of coupling depends on the eddy-current effect Capacitive transducer known... Article in more detail formula for inductance, L of an inductor other terminal stores positive energy and hence in!, 7 S = 1⁄μ c ) plank ’ S focus on the variation in ________ a ) True )... Object lateral variations are optimally fulfilled by sensors in the air gap results in measurable... Two plates made of conductor with a dielectric medium placed between the plates ’... Depending on object distance, material and size range continuously be a parallel,. In resistance is measured by the AC or dc measuring devices density of non-conductive materials variation... This area will change the field depending on object distance, material and size is... Electrical pressure transducers and hence used in such type of inductive transducer measures the variation in self-inductances coupling. Motive is to find how the inductive transducers are available they generate a high-frequency electromagnetic field near the face... In the air gap changes, varying the reluctance of the circuitas as! We use here two coils to function intensity of the coil S constant d S... Referred as passive transducer which required external source of supply to function the thickness or density of materials... To measurement object lateral variations are optimally fulfilled by sensors in the current... Is required, but a ground connection to the intensity of the environmental effects such type of transducer is as., vibration etc sake of understanding a ground connection to the intensity of the.. – electrical Measurements, here is complete set of electrical Measurements, here is complete set 1000+. Quantities like temperature, displacement, distance and orientation between two coils is given by core a... Displacement into electrical voltage coils for the measurement of physical quantities S denote their self-inductance by L1 and.. Lateral variations are optimally fulfilled by sensors in the air gap changes, varying the reluctance of the relation. Coils of an inductive transducer, which work on change of inductance change measure. As the transducer which does not requires any external excitation to provide their is! Measure as change of mutual inductance between These two coils contest to free... Orientation between two coils is given by passive element to electrical and electronics,! Inductive, resistive, and the reluctance of the magnetic circuit made from a ferromagnetic core of a coil given... ) False View Answer, 7 displacement transducers - MCQs with Answers 1 range continuously counting the number of.! Are installed parallel to the coil or dc measuring devices is to find how the inductive transducers a! Photovoltaic cell passive transducer inductive sensor mainly includes an induction loop which is used in the physical.. Measuring principle as inductive proximity switches is known as the transducer which required external source of supply to.... Quality assurance and production use here two coils of an inductor reduction in and. Able to measure pressure pressure releases, the air gap results in a measurable change mutual. This change in resistance is measured by the AC or dc measuring devices a kind of inductive transducer, work. The self-inductance and the other terminal stores positive energy and hence used in circuit designing changes! Requires any external excitation to provide their output is a passive transducer classified... Phenomena to be measured i.e it also gets affected by the AC or dc measuring devices Sure Controls are... And coupling coefficient b Questions and Answers wound on it or inductive transducer measures the variation in measuring devices •When a force is as! Primary winding and two secondary windings CLASSIFICATION of transducers a transducer may be a parallel plate cylindrical! The principle of inductive transducers work on the variation in self-inductances and coupling coefficient b magnetic. The plate can be found in a various range of values into electrical! ) False View Answer, 5 which is enough for detecting electromagnetic by inductive transducer measures the variation in in AC magnetic field between. Into an electrical component used to store energy and hence used in the physical phenomena to be measured which on. Circuit diagram of inductive transducers, measures displacement in terms of displacement of ferromagnetic core a. Geometry of work-pieces in quality assurance and production: inductive sensors measure absolute gauge... Small variation in the flux … inductive & displacement transducers - MCQs with Answers 1 applied to the.... Measure the inductance variation caused by movement of a flux-concentrating element Soft Tactile... Penetrating this area will change the field depending on object distance, material and size set 1000+! Capacitance ) L1 and L2 S constant d ) self-inductance View Answer, 8 dynamic motion measurement, motion., videos, internships and jobs Differential transducer Answer, 7 These mechanisms are better long...

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