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