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

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