Design, construction and evaluation of a DC in - DC out LVDT sensor

Date

3-1991

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Edvino G. Eusebio

Abstract

To be able to design, construct and evaluate a DC in - DC out Linear Variable Differential Transformer (LVD1) sensor with a targetted linear range of -6.35 to 6.35 mm, transformer construction formulas together with known _VDT dimensions were used. The constructed sensor consisted of a silicon steel core “,i(8.9 mm x 6.35 mm x mm) which slides through one central primary coil with two secondary windings on each side. Each of the three coils consisted of Number 30 AWG copper wires which were turned 720 times along a span of 25.4 mm in length. An easily tunable sine wave generator produced the AL input of 6.27 Vrms at 5 kHz for the LVDT sensor while a precision full wave rectifier with filter converted the AC output, which was proportional to the core's position, to DC. The input and output waveforms o, the the sensor were clean sine waves. les, results showed that, for stability of readings. the minimum input power supply ratings were V and -12.8 V from the ground. The linear range spanned from -8.7 to +8.3 mm excluding -0.3 to 0.3mm. Within the linear range, regression analysis of the average of three trials yielded a correlation coefficient of r = 0.9999895117 and a linear model given by Xr = 0.00412868 Vr + 0.005528 +/-0.006300 mm for the core on the right of the null position and a correlation coefficient r = -0.9999687193 and modelled by the line given by X1 = -0.00409472 V1 - 0.03349 +/-0.01491 the core on the left of null. At an input voltage of 6.27 Vrms, the sensor has a sensitivity of 243.2 mV/mm and a resolution of +/0.005 mm. Voltage were found to be constant with a mean tolerance (standard deviation) of +/- 2.281 mV and a close to zero mean coefficient of variation of 0.401 % for each position in x.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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