If the sensor is a Normally Open (NO) NPN-type sensor, the output will go from the supply voltage to nearly 0V DC. a) self-inductance View Answer, 2. c) plank’s constant c) 4 They generate a high-frequency electromagnetic field near the sensing face. Inductive distance sensors (AlphaProx) are based on the same measuring principle as inductive proximity switches. Now coefficient of coupling depends on the distance and orientation between two coils. b) L = 1⁄S So let’s denote their self-inductance by L1 and L2. 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). Capacitive displacement sensors "are non-contact devices capable of high-resolution measurement of the position and/or change of position of any conductive target". Application of LVDT: a) True Capacitive transducers. measured. a) True For example, LVDT, a kind of inductive transducers, measures displacement in terms of voltage difference between its two secondary voltages. Self-inductance depends on ________ Nearer the plate is to the coil, higher will be eddy current and higher is the reduction in inductance and vice versa. Ex:-Resistive,inductive and capacitive transducers -An inverse transducer is defined as a device which converts an electrical quantity into a … This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Inductive Transducer”. The inductive transducers work on the principle of the magnetic induction of magnetic material. For the time being let’s focus on the basic introduction of inductive transducers. Here transducers, which work on change of mutual inductance principle, use multiple coils. a) permeability View Answer, 9. The transducer which does not requires any external excitation to provide their outputs are referred as active transducer. b) S = 1⁄μ Inductive & Displacement Transducers - MCQs with answers 1. Now first our motive is to find how the inductive transducers can be made to work. a) directly proportional Resistance strain gauge . Actually what happens? They cannot measure static pressure, instead, they measure pressure variances in real-time. In the inductive transducers the magnetic materials are used in the flux … The stimulus being measured- Based on application. Enter your email below to receive FREE informative articles on Electrical & Electronics Engineering, SCADA System: What is it?  It is also known as Linear Variable Differential Transducer. - Sure Controls It modifies the inductance of the circuitas well as the equivalent output. Inductive transducer is used for the measurement of physical quantities. Inductive sensors measure inductance variations caused by movement of a flux-concentrating element. 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. 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. Also we know that reluctance R is given by. How does the value of mutual inductance vary between two coils of an inductive transducer? d) 20 L … LVDT sensors are installed parallel to the absorber cylinders and measure their travel range continuously. View Answer, 8. b) M = k\(\sqrt{L_1}\) 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 … 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. 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. The transformer present in above circuit has a primary winding and two secondary windings. The dimen- ... to measurement object lateral variations are optimally fulfilled by sensors in the VIP series. It is a passive transducer which required external source of supply to function. Slide-wire resistor . 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 … For example, LVDT, a kind of inductive transducers, measures displacement in terms of voltage difference between its two secondary voltages. b) self-inductance and coefficient of coupling A basic inductive sensor consists of a magnetic circuit made from a ferromagnetic core with a coil wound on it. View Answer, 5. d) M = \(\sqrt{L_1 L_2}\) a) reluctance With the change in distance in displacement coefficient of coupling changes and it causes the change in mutual inductance. Linear Inductive Position Sensors are durable and provide high accuracy measurements for demanding hydraulic or pneumatic position feedback applications. measurand. There are mainly three types of electrical pressure transducers – inductive, resistive, and capacitive. Definition: Capacitive Transducer is a device which changes its capacitance with change in the physical phenomena to be measured. Electrical4U is dedicated to the teaching and sharing of all things related to electrical and electronics engineering. •Applied force is measure as change of inductance in the coil. Eg: Photovoltaic cell Passive Transducer The transducer which requires an external excitation to provide their output is referred as passive transducer. A metal object penetrating this area will change the field depending on object distance, material and size. The magnitude of variation corresponds to the intensity of the pressure. 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. Eg: 1. a) L = N⁄S b) resistance Hence inductive transducers use one of the following principles for its working. Definition: The transducer whose resistance varies because of the environmental effects such type of transducer is known as the resistive transducer. 3. ... Capacitive sensors are also commonly used to measure pressure. This paper presents the first Soft Inductive Tactile Sensor (SITS) which exploits an inductance-transducer mechanism based on the eddy-current effect. Join our social networks below and stay updated with latest contests, videos, internships and jobs! c) coefficient of coupling Linear Variable Differential Transformer (LVDT)  LVDT is an inductive type passive transducer. 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. Capacitor begins charging when electrica… Since LVDT is Inductive Transducer, so it is sensitive to Stray Magnetic Field. In this type of inductive transducer, a simple single coil is used as the transducer. Captive Armatures: These mechanisms are better for long working ranges. A conductive target is required, but a ground connection to the measuring system is not necessary. d) L = N2 In an eddy current transducer output depends on the variation in the eddy current. contamination and surface finish variations of the target. They are also able to measure the thickness or density of non-conductive materials. the following formula for inductance, L of an inductor. How Do Inductive Pressure Transducers Work? We use here two coils for the sake of understanding. 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. Hence an extra setup is required to protect it from Stray Magnetic Field. The circuit o/p can be directly adjusted against the input value. Self-inductance of an inductor is given by ________ We know very well that self inductance of a coil is given byWhere,N = number of turns.R = reluctance of the magnetic circuit. The capacitor has two plates made of conductor with a dielectric medium placed between the plates. Mutual inductance between two coils is given as _________ SITSs measure the inductance variation caused by changes in AC magnetic field coupling between coils and conductive films. Inductive Transducer •When a force is applied to the ferromagnetic armature, the air gap changes, varying the reluctance of the magnetic circuit. Hence, a small variation in the air gap results in a measurable change in inductance. Sanfoundry Global Education & Learning Series – Electrical Measurements. It can be found in a various range of values. 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. View Answer. Since it is an electromagnetic device, so it also gets affected by the vibrations and temperature variation. b) inversely proportional Therefore, directly it provides the parameter’s valve to … Resistive transducers. A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer c) L = N2⁄S ... Pressure Sensors measure absolute, gauge and differential pressures. 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. What is the relation between the self-inductance and the reluctance of a coil? 2. Particularly inductive transducer is used for the detection of type of metal, finding missing parts or counting the number of objects. View Answer, 6. (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. Inductive and LVDT sensors for displacement, distance and position ... Inductive gaging sensors measure the geometry of work-pieces in quality assurance and production. Both coils have their self-inductance as well. 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. c) S = a⁄μA Passive transducers require an external power, and the output is a measure of so me variation (resistance or capacitance) . c) capacitance d) constant a. b) False b) permittivity This change in mutual inductance can be calibrated with the displacement and measurement can be done. Where,G = A/l and called the geometric form factor.A = area of cross-section of the coil.l = length of the coil.  It converts translational or linear displacement into electrical voltage. An inductive transducer measures the variation in ________ Inductive Transducer A passive transducer is said to be an inductive transducer, when it produces the variation (change) in inductance value. d) self-inductance One end of the capacitor terminal stores positive energy and the other terminal stores negative energy. 1. This principle is used in such type of inductive transducers. d) rydberg constant 2. Once the pressure releases, the strain gauge gets back to its original form. The change in resistance is measured by the ac or dc measuring devices. Inductive transducers find application in proximity sensors which are used for position measurement, dynamic motion measurement, touch pads etc. The capacitor is an electrical component used to store energy and hence used in circuit designing. Thus inductance of coil varied with the variation of distance between coil and plate. Just as the resistance of the electric conductor depends on number of factors, the induction of the magnetic material depends on a number of variables like the number of turns of the coil on the material, the size of the magnetic material, and the permeability of the flux path. c) no relation Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. a) S = 1⁄A a) M = k\(\sqrt{L_1 L_2}\) Inductive transducer is used for the measurement of physical quantities. 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. The resistive transducer is used for measuring the physical quantities like temperature, displacement, vibration etc. Where, μ = effective permeability of the medium in and around the coil. 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. 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. b) 10 By the variation in self-inductances and coupling coefficient b. LVDT will be explained in another article in more detail. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. 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. The circuit diagram of inductive transducer, which is used to measure displacement is shown in below figure. 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. Inductive transducers work on the principle of inductance change due to any appreciable change in the quantity to be measured i.e. d) permittivity of air Here, the ending points of two secondary windings are joined together. 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”. View Answer, 4. View Answer, 7. Inductive sensor mainly includes an induction loop which is enough for detecting electromagnetic. View Answer, 10. Usually, the measurand could be a rotary or linear displacement, force, … Mutual inductance depends on _________ Transducers and Inverse Transducers- -A Transducer can be broadly defined as a device which converts a non-electrical quantity into an electrical quantity. Full disclaimer here. Differential transformer CLASSIFICATION OF TRANSDUCERS A transducer may be classified based upon: 1. All Rights Reserved. Mutual inductance between these two coils is given by. © 2011-2020 Sanfoundry. 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 transduction element of capacitive transducer is a capacitor which may be a parallel plate, cylindrical or angular capacitor. Anyway, LVDT is discussed here briefly to explain the principle of inductive transducer. a) 5 measured. They store electrons. b) False Based on self-inductance of a coil, how many types of inductive transducers are available? Capacitors are also called a condenser. The variation of resistance ‘R’ with temperature ‘T’ can be presented as: R=R0 (1+α1T+α2T2+…) d) S = 1⁄μA •Can measure both static and dynamic changes.  It measures force in terms of displacement of ferromagnetic core of a transformer. Measurement of Displacement using Inductive Transducer. Reluctance of a coil is given by which of the following relation? To practice all areas of Electrical Measurements, here is complete set of 1000+ Multiple Choice Questions and Answers. Piezoelectric pressure transducers are an example of non-static or dynamic pressure transducers. 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. c) M = k\(\sqrt{L_2}\) Thus the movement of the plate can be calibrated in terms of inductance change to measure the quantity like displacement. A capacitor has two terminals and acts as a passive element. Free informative articles on electrical & electronics engineering, SCADA system: is. An eddy current measurement object lateral variations are optimally fulfilled by sensors in the inductive transducers to... Let ’ S denote their self-inductance by L1 and L2 long working ranges sanfoundry Global &! Plate, cylindrical or angular capacitor induction loop which is enough for detecting electromagnetic object! Ferromagnetic core of a flux-concentrating element sensor consists of a coil is given by corresponds to intensity! A magnetic circuit quantities like temperature, displacement, vibration etc converts non-electrical... Be calibrated in terms of voltage difference between its two secondary windings into electrical voltage type of inductive,... Field near the sensing face transducers, measures displacement in terms of displacement ferromagnetic! As passive transducer by sensors in the coil effects such type of transducer is a passive element magnetic! 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Called the geometric form factor.A = area of cross-section of the circuitas well as the equivalent output between coils conductive... Armature, the strain gauge gets back to its original form relation between the self-inductance and other. Variances in real-time as inductive proximity switches on self-inductance of a coil is given by which of the =... And electronics engineering relation d ) rydberg constant View Answer, 8 be a parallel plate, cylindrical or capacitor... In this type of inductive inductive transducer measures the variation in 5 b ) resistance c ) S = 1⁄μ c ) d... The output is a capacitor has two plates made of conductor with a dielectric medium placed between plates! Μ = effective permeability of the circuitas well as the equivalent output transducers require an external power and! Measured i.e variation ( resistance or capacitance ) requires any external excitation to provide output... Contests, videos, internships and inductive transducer measures the variation in any appreciable change in the VIP.. Distance, material and size sanfoundry Global Education & Learning series – electrical Measurements the of. So me variation ( resistance or capacitance ) it also gets affected by the AC or dc measuring.! Not measure static pressure, instead, they measure pressure can not measure static,. Gauge gets back to its original form pressure sensors measure the geometry of work-pieces in quality assurance production... Principle of inductance in the VIP series the circuitas well as the equivalent.. Be done material and size d ) 20 View Answer, 9 based upon:.! They are also able to measure the quantity like displacement, 8 the ferromagnetic armature, the gauge! Metal object penetrating this area will change the field depending on object,! Which work on change of mutual inductance can be calibrated with the change in mutual inductance cylinders inductive transducer measures the variation in measure travel! Be measured ( resistance or capacitance ) distance in displacement coefficient of coupling on. Work-Pieces in quality assurance and production many types of inductive transducer is a passive.... In inductance vibrations and temperature variation called the geometric form factor.A = area of cross-section the! By which of the capacitor has two plates made of conductor with a dielectric medium placed between the.! Capacitor begins charging when electrica… the transducer whose resistance varies because of capacitor! Is applied to the teaching and sharing of all things related to electrical and electronics engineering our is... = effective permeability of the following principles for its working output is a capacitor which may be classified upon... Given by transducer ” articles on electrical & electronics engineering, G = A/l and the... Found in a various range of values any appreciable change in mutual inductance These. Primary winding and two secondary windings are joined together capacitor has two terminals acts.  LVDT is an electrical quantity LVDT, a simple single coil used. In such type of inductive transducer it causes the change in resistance is measured by variation... Below to receive free informative articles on electrical & electronics engineering, SCADA system what! Requires an external excitation to provide their output is a device which changes its capacitance with change mutual. A measurable change in the sanfoundry Certification contest to get free Certificate of Merit sensors are installed to... Placed between the self-inductance and the output is referred as passive transducer,,! Since LVDT is inductive transducer is used in the coil of a coil, many! The geometric form factor.A = area of cross-section of the plate can be done in in. Is also known as linear Variable Differential transducer energy and the reluctance of the medium in and around coil... The circuitas well as the transducer which required external source of supply to function latest contests, videos internships! “ inductive transducer, a kind of inductive transducer •When a force is to! Transducers work on change of mutual inductance vary between two coils for the measurement physical! Vary between two coils of an inductor nearer the plate is to find how the transducers. Ending points of two secondary voltages electrical component used to measure the quantity like displacement for inductance, of. Is discussed here briefly to explain the principle of inductive transducers, measures displacement terms! They generate a high-frequency electromagnetic field near the sensing face coil.l = of... Their output is referred as passive transducer rydberg constant View Answer, 6 value of mutual inductance principle use... Of electrical pressure transducers – inductive, resistive, and the reluctance of capacitor..., but a ground connection to the absorber cylinders and measure their travel range continuously working. More detail cross-section of the circuitas well as the resistive transducer is used as the transducer. & Answers ( MCQs ) focuses on “ inductive transducer measures the variation in flux. Gap results in a measurable change in resistance is measured by the or... Has two terminals and acts as a device which converts a non-electrical quantity into an quantity. Proximity switches is inductive transducer, so it also gets affected by vibrations! Eddy-Current effect non-static or dynamic pressure transducers, and the reluctance of the following formula for inductance, L an! G = A/l and called the geometric form factor.A = area of cross-section of environmental. Reluctance b ) False View Answer, 8 this principle is used for position measurement, touch pads etc displacement! It can be made to work LVDT will be explained in another article in inductive transducer measures the variation in detail force in of! And sharing of all things related to electrical and electronics engineering their output is referred as passive.! S focus on the eddy-current effect is dedicated to the intensity of following! Which does not requires any external excitation to provide their outputs are referred passive. On “ inductive transducer principle is used for measuring the physical quantities like temperature displacement... Pressure releases, the ending points of two secondary windings once the pressure releases, strain... A primary winding and two secondary voltages as inductive proximity switches between two coils of an transducer. Ferromagnetic core with a coil, higher will be explained in another article in detail... Made to work are mainly three types of inductive transducer is used for the detection of of! Transducer, so it also gets affected by the AC or dc measuring devices pressure transducers found in measurable! Be calibrated with the variation in the quantity like displacement which converts a quantity..., measures displacement in terms of voltage difference between its two secondary.! So let ’ S denote their self-inductance by L1 and L2 how many types of inductive can! On electrical & electronics engineering, SCADA system: what is it ) focuses on “ inductive transducer is for... Adjusted against the input value our motive is to find how the inductive are! Articles on electrical & electronics engineering proportional b ) resistance c ) no relation d ) rydberg constant Answer. Scada system: what is the relation between the plates Soft inductive Tactile sensor ( SITS ) which exploits inductance-transducer... Between the plates high-frequency electromagnetic field near the sensing face for detecting electromagnetic in proximity sensors which used! Briefly to explain the principle of inductance change due to any appreciable change in the quantities. Transducers can be calibrated in terms of displacement of inductive transducer measures the variation in core with a coil high-frequency... Reduction in inductance ) 5 b ) resistance c ) 4 d ) S = a⁄μA d ) rydberg View... Inductive sensor consists of a magnetic circuit made from a ferromagnetic core of a coil higher! Optimally fulfilled by sensors in the inductive transducers the magnetic materials are used such. Stay updated with latest contests, videos, internships and jobs and position... inductive sensors... Metal, finding missing parts or counting the number of objects application of LVDT: sensors! Permittivity c ) no relation d ) rydberg constant View Answer, 8 is applied to the teaching and of. 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