Lecture series on industrial instrumentation by prof. Welcome to the lesson 10 of industrial instrumentation. What is reason for connecting secondaries of lvdt in series opposition. Download nptel audio lectures mp3 and subtitles srt. Linear variable differential transformer wikipedia. Introduction to transducers classification and selection by ms. Nevertheless, for a given lvdt, some limits determine a change in linearity. A very basic transducer which is always useful in the field of instrumentation, i have studied about this in my college days. It is an electromechanical device designed to produce an ac voltage output proportional to the relative displacement of the transformer and. Control engineering online course video lectures by iit bombay. Engineering technology simulation learning videos 181,457 views. The video is about operational principle of lvdt its constructional details and its working. Now let me explain about the lvdt with its principle of operation and i will explain how it is constructed for its well known operation and you can understand the working of linear variable differential transformer transducer lvdt. The text transcription of nptel video lectures is provided in the following website.
Electrical engineering industrial instrumentation nptel. Linear variable differential transformer or lvdt is an electromechanical device that produces electrical output proportional to displacement of a movable core. Introduction, strain gauge, torque measurement, thermistor, thermocouples, lvdt, flowmeter, ph and viscosity measurement, dissolved oxygen sensors. The national programme on technology enhanced learning nptel, a project funded by the ministry of human resource development mhrd was first conceived in 1999 to pave the way for introducing multimedia and web technology to enhance learning of. The matter presented here is prepared by the author for their respective teaching assignments by referring the text books and reference books. Introduction to transducers classification and selection.
Nptel, an elearning initiative by the 7 indian institutes of technology and the indian institute of science with the support of the mhrd, govt. Linear variable differential transformer design and. Lvdt is another linearly variable different displacement transducers have a limit. Nptel, online courses and certification, learn for free. What are the advantages with differential op of lvdt.
Nptel syllabus control engineering video course introduction to control problem industrial control examples. Active sensors design and manufacture advanced positionsensing solutions for motion control and measurement systems. The potentiometer is an electric instrument that used to measure the emf electro motive force of a given cell, the internal resistance of a cell. Principles of modern cdma mimo ofdm wireless communicationscourse sponsored by aricent. Alok barua, department of electrical engineering,iit kharagpur. The lvdt can be used in all applications where displacements ranging from fraction of a mm to a few cm have to be measured. Lvdt functional advantages and operating principles. In the first course, mainly the dc motor control both steady state and dynamic, and steady state torque. Lecture series on data structures and algorithms by dr. Why use linear variable differential transformers technical note background linear variable differential transformers lvdts are used to measure linear displacement straight line distance travel along a single axis.
Learn for free, pay a small fee for exam and get a certificate. Nptel provides elearning through online web and video courses various. Movement of the float can be tracked by attaching a potentiometer or lvdt to it. How to download all of the lectures in pdf for a course in. Now let me explain about the lvdt with its principle of operation and i will explain how it is constructed for its well known. Application of finiteelement modelling of magnetic fields in a linear variable differential transformer lvdt is demonstrated and electromagnetics of. Friction free operation no mechanical contact between core and coil usually infinite mechanical life infinite resolution electromagnetic coupling limited only by electrical noise low risk of damage most lvdts have open bore holes null point repeatability zero displacement can be measured single axis sensitivity effects of. Linear variable differential transformer lecturebtech by. Machinery fault diagnosis and signal processing prof. Digital display of the temperature of 3 zones can be seen in the above picture. Data structures and algorithms nptel online videos. What is the range of primary excitation voltage of. Use completed lvdt distancevoltage conversion equation below to calibrate lvdt in dspace. And the way how the energy is getting converted is.
The sensors are offered in gagehead configuration also known as penprobe or pentype sensors, in captivecore configuration also known as guidedcore and in opencore configuration. Lvdt lvdt watch industrial instrumentation electrical engineering course from iit kharagpur video lectures by prof. For example, if a lvdt sensor measures a displacement up to 20 mm and it provides an output as a number between 1 and 100 then the resolution of the sensor. Our success in international markets is based on the philosophy of providing system designers with the most accurate, reliable and cost effective position. Now, i will explain how to auto download nptel audio lectures mp3, subtitles srt of the video lectures. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. In the previous post, we have seen how to download nptel video lectures mp4 flv without going through nptel website. A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer. Linear variable differential transformer design and verification using matlab and finite element analysis 79 each variable is changed 9 times within the rang e, while keeping all other parameters fixed. Actuate lvdt to 0position of ema and install rod end. Nptel online certification courses since 20, through an online portal, 4, 8, or 12week online courses, typically on topics relevant to students in all years of higher education along with basic core courses in sciences and humanities with exposure to relevant tools and technologies, are being offered. Theoretically an lvdt can have infinite resolution. Broad offering of sensors based on lvdt technology linear variable differential transformer for measurement of linear displacements.
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. The full form of lvdt is the linear variable differential transformer. Nptel electrical engineering video lecture online study. You will find all pdf s and also as mp3 file for all video lectures which are in nptel. Industrial instrumentation online course video lectures by. Linear variable differential transformers lvdts are linear positiondisplacement transducers that are exceptionally rugged, frictionless and provide a long cycle life with proper use. Record voltage of lvdt when ema is at 0position and rod end installed. Nptel provides elearning through online web and video courses various streams. Data structures and algorithms nptel video lectures naveen garg, nptel video lectures, nptel online courses, youtube iit videos nptel courses. Transformer basics electric machines single phase transformer three phase transformer transformer type instrument transformer transformer test transformer accessories transformer oil maintenance of transformers installation of transformers transformer protection. Nptel material is available for free on nptel website. It is basically an inductive based sensor or inductance based sensor and primarily it is used for the measurement of displacement. The capturing and coding of a number of rules of thumb that are used to find initial. Mention the common specifications for commercially available lvdt 38.
Figure 3, figure 4, figure 5, figure 6, figure 7, figure 8 and figure 9 show the effect on the. Lvdt support electronics although an lvdt is an electrical transformer, it requires ac power of an amplitude and frequency quite different from ordinary power lines to operate properly typically 3 vrms at 3 khz. You can find them according to your branch and subject in the below link national mission on education through ict this was initiated by iit madras. And also it is used to compare emfs of different cells. Transfer function models of mechanical, electrical, thermal and hydraulic systems. Diaphragm slug catheter weight lvdt muscle balance force isotonic contraction same force isometric contraction same length muscle sounds. Our products include linear and rotary position sensors, lvdts, tilt sensors and electronic signal conditioning circuits. Linear variable differential transformers operation. Potentiometer construction, working and applications. Nptel online videos, courses iit video lectures well organized. Verify that dspace plot accurately shows displacement versus time. This channel contains technical lectures on civil engineering from seven indian institutes of technology iits and indian institute of science iisc, ban. Acting as a secondary transducer it can be used as a device to measure force, weight and pressure. Lvdt works under the principle of mutual induction, and the displacement which is a nonelectrical energy is converted into an electrical energy.
Discuss a diaphragm gage with strain gage for displacement measurement 36. Data structures and algorithms data structures and algorithms. Linear variable differential transformer design and verification using matlab and finite element analysis 77 1. Design of 420 ma current transmitter for lvdt sensor. Lvdt working principle animation instrumentation tools.
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