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