Question bank for Electrical Engineering (EE). As high gauge factor indicates a large change in resistance, that leads to high sensitivity. This discussion on Sensitivity of LVDT is mainly due toa)Magnetic shielding of the coreb)Permeability of the corec)Exact cancellation of secondary voltaged)Insulation used in the windingsCorrect answer is option 'C'. Also used in measurement of pressure, load, acceleration, weight, force, etc. Finding Sensitivity of the LVDT 1. While the measuring range of RVDT is nearly ± 40 degrees. High Input and High Sensitivity – The LVDT gives a high output and also there is no need for amplification. LVDT position sensors are commonly used to measure the position of the moving components in a machine, such as control valves in hydraulic systems and control surfaces in aircraft. Friction less device and electrically isolated . one kind of electromechanical transducer used to give the linear o/p which is proportional to the i/p angular displacement The output E0 will be positive. A phase sensitivity detector connected at the output of LVDT is used to judge and calculate the direction of movement. By continuing, I agree that I am at least 13 years old and have read and The primary winding is connected to the AC Source. The AD698 accommodates a wide range of input and output voltages and frequencies. Where, Es1 and Es2 are the EMF induced in the Two secondary windings Respectively. Its use is very widespread due to its features of being a contactless sensor, with virtually infinite resolution and high accuracy [1]. a) Change in diameter of the wire b) Change in length of the wire c) Change in both length and diameter d) Change in resistivity. Thus, if it is known that the temperature of the gauge will vary due to any influence and the temperature compensation is required to ensure that the force measurement is accurate. Whereas, the sensitivity of the RVDT is in the range of 2 to 3mv per volt per degree of rotation. Due to the design of the LVDT displacement transducer the LVDT has a theoretically infinite resolution. However, in this research a conventional LVDT was constructed and used up to measure the level of petrol, gasoil, and water. Linear variable differential transformers are used to measure a displacement. Sensitivity varies with excitation frequency, which must also be specified. this windings are axially spaced and wound on a cylindrical coil former. Answers of Sensitivity of LVDT is mainly due toa)Magnetic shielding of the coreb)Permeability of the corec)Exact cancellation of secondary voltaged)Insulation used in the windingsCorrect answer is option 'C'. Low hysteresis and high repeatability. The LVDT measures the displacement in the range of ±100μm to ±25cm, and the RVDT measures the angular displacement up to ±40º. community of Electrical Engineering (EE). Some legacy DC-LVDTs use a ratiometric configuration, which requires that they also … It is less in weight. Shielding is required since it is sensitive to magnetic field. Can you explain this answer? Advantage. A very high range ranging from 1.25mm to 250mm. over here on EduRev! LVDTs are popular for their robust, frictionless design, which makes these transformers a great fit for position measurement in harsh environmental conditions. The LVDT has high sensitivity. LVDTs are mainly used for industrial, military, and aerospace applications due to their nearly infinite resolution, excellent linearity, and mechanical durability. Save my name, email, and website in this browser for the next time I comment. Full Record; Other Related Research; Authors: Rasnick, W H Publication Date: Sat Jan 01 00:00:00 EST 1972 Research Org. The sensitivity factor of strain gauge is normally of the order of. The LVDT can be used for displacement measurement ranging from fraction of mm to few cm. Linear Variable Differential Transducer (LVDT), Do you know how you can Generate Electrical Energy by Foot…. Ans : (c) 11. The performance of the transducer gets affected by vibrations; Its is greatly affected by temperature changes. A rod shape magnetic core is position centrally inside a coil assembly. It has excellent repeatability. For most DC-LVDTs, the comparable characteristic to sensitivity is scale factor, which is usually expressed as Volts DC output per inch of core displacement. In RVDT, the angular position is measured by comparing the … Disadvantages of LVDT LVDT is sensitive to stray magnetic fields so it always requires a setup to protect them from stray magnetic fields. A resistance wire strain gauge must possess the following characteristics in order to have desirable results-The strain gauge should have a high value of gauge factor. knee point voltage of a current transformer. Bonded wire strain gauges are. Connecting Leads 3. A wide variety of measurement ranges are available in different LVDTs, typically from ± 100 μm to ±25 cm. Its sensitivity, due to induced EMF and displacement It is concluded that they are advantageous as compared than any other inductive transducer. measurement and control of thickness of metal sheet being rolled. Sensitivity mostly affects the gain required of the LVDT's signal conditioning electronics. Study the Applications of LVDT: High Range – The LVDT has the very wide range for measurement of displacement. As an example, LVDT sensors have been selected for the LHC (Large Hadron Collider) collimators, where integrated doses of up to a few MGray per year are expected. The 20 Hz to 20 kHz excitation frequency is determined by a single external capacitor. And the output E0 will be negative. The resolution and the accuracy of such a sensor are mainly determined by the conditioning electronics and the correction algorithm used. Measuring LVDT/RVDT Performance The versatile and flexible Model 2250 Digital Phase Angle Voltmeter allows a wide range of tests to be done on LVDT and RVDT devices. The LVDT design lends itself for easy modification to fulfil a whole range of … : Oak Ridge Y-12 Plant, Tenn. (USA) OSTI Identifier: 4623613 Report Number(s): Y-DA-4839; CONF-721130-23 NSA Number: NSA-27-014457 DOE Contract Number: W-7405-ENG-26 Resource … Can you explain this answer? It is not suitable for dynamic measurement. Apart from being the largest Electrical Engineering (EE) community, EduRev has the largest solved The tests can be done manually using the front panel controls, or automatically, using the IEEE-488 bus. Typically, standard LVDT transducers have a short life; due, mainly, to sticking, which renders the gage head useless. Typical excitation voltages range from 1 V to 24 V rms, with frequencies from 50 Hz to 20 kHz. It is solid and robust in construction. this  rod provides a low reluctance path for the magnetic flux linking the coil. The units of an LVDT measurement are typically in mV/V/mm or mV/V/in. The sensitivity range of LVDT is high, ranging 2.4mV per the voltage and per degree change in moments and 2 to 3 mV per voltage per degree rotation in RVDT. Sensitivity Analysis in Linear Programming, Sensitivity Analysis - Control System, GATE, Case sensitivity with angularjs ui router, GATE Notes & Videos for Electrical Engineering, Basic Electronics Engineering for SSC JE (Technical). The LVDT offers good accuracy, linearity, sensitivity, infinite resolution, as well as frictionless operation and ruggedness. Sensitivity mostly affects the gain required of the LVDT's signal conditioning electronics. As against the sensitivity of RVDT lies between 2 … You have entered an incorrect email address! Linear Displacement is movement in one direction along a single axis. Sensitivity of LVDT is mainly due toa)Magnetic shielding of the coreb)Permeability of the corec)Exact cancellation of secondary voltaged)Insulation used in the windingsCorrect answer is option 'C'. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. If the answer is not available please wait for a while and a community member will probably answer this a) 1 to 1.5 b) 1.5 to 2.0 c) 0.5 to 1.0 d) 5 to 10. Correct answer is option 'C'. Click here for instructions on how to enable JavaScript in your browser. The sensing angle of a typical potentiometer is in the range of 00 to a maximum between 2400 and 3300. What is Supervisory control and data acquisition (SCADA)? However, this is limited by the LVDT instrumentation and electronics used. It is smaller in size. The RMS input voltage of LVDT and RVDT is 1-24V and 3V, respectively. The sensitivity of the transducer is also very high. LVDT gives Low power consumption. A displacement measurement also indicates the direction of motion. The time response is dependent on the equipment to which the core is connected. It is approximately 2.4mv per volts per degree of rotation. Due to equal flux linkage the secondary induced voltage are equal but they have opposite polarity. Applications: There are some important applications of linear variable differential transformer (LVDT) which are given below, It act as a secondary transducer, it is used to measure force, weight and pressure. Click here for instructions on how to enable JavaScript in your browser. The performance is serially affected by dirt and other contaminator. Random errors in a measuring system are due to Synchronous Impedance or E.M.F. A phase sensitivity detector connected at the output of LVDT is used to judge and calculate the direction of movement. Hence  the voltage induced in to this windings are of opposite polarities. He wants to Share his experience & Knowledge and helps technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics. Can you explain this answer? A wide variety of measurement ranges are available in different LVDTs, typically from ±100 μm to ±25 cm. Due to this, a good transfer of strain from carrier to a grid of wires is achieved. Sensitivity varies with excitation frequency, which must also be specified. Assume that the core is exactly at the center of the coil assembly then the flux linked to the both secondary windings will be equal. An LVDT consists of a coil assembly and a core. Ans : (b) 10. Similarly If the core is displace towards the secondary-two then. 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