Abstract
The presented report discusses the study of LVDT and its various applications in civil engineering. LVDT is the most preferred choice for the measurement of displacement, pressure, force, level, flow, and other physical quantities in engineering applications and in industries. Measuring displacement, settlements, deformations of slopes is a critical need in many structural processes, so some sensors are used for this purpose like potentiometer, capacitance picks, LVDT etc. The main aim of studying LVDT’s is to find various other uses in structural processes advantageously which consumes less time and are more efficient. LVDT’s when used with ETPFS’s in a concrete beam can not only measure deflection of the beam but also cracks in it. LVDT has a wide range use in railways to measure dynamic displacement of rail bridges with advanced video based system. Because of its high sensitivity and high resolution LVDT’s can detect vibrations in structures. Apart from dial gauges, using a LVDT is a primitive technique for obtaining deformation in conventional structural tests. Although there are certain advantages to using LVDTs, such as high resolution and accuracy, simple installation, and real-time logging ability, there are also some disadvantages, such as high cost, the inability to obtain the whole displacement field, and extra charges for data acquisition.
Highlights
A Linear Variable Differential Transducer (LVDT) is a displacement based transducer
The major challenge faced in LVDT is linearity in limited stroke range
As LVDT works on the principle of mutual induction between the primary and two secondary windings, the relation between the input and output of the LVDT is derived using the concept of mutually coupled circuits [3]
Summary
A Linear Variable Differential Transducer (LVDT) is a displacement based transducer. It is a passive transducer used to measure displacement. The performance of the LVDT is subjective to the transducer geometry, the influence of physical parameters on linearity and sensitivity [2]. The output of the LVDT is voltage across the secondary windings, which are connected in series opposition. The flux linkage between the primary and secondary windings changes with the core position [4]. The output measure is based on the variation in mutual inductance between the primary winding and each of two secondary windings when the core moves due to subjected displacement [5]. The displacement to be measured is proportional to the position of the core which is extracted from the output voltage [8]. International Journal of Transportation Engineering and Technology 2017; 3(4): 62-66
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