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

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