A microcomputer-based water level displacement measuring instrument using the LVDT sensor

Date

3-1998

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

This study aimed to design a water level displacement measuring instrument using the LVDT sensor, and interface this instrument to a computer for automated storage and display of data. The design consists of a lever system whose one end is connected to a float that is directly in contact with the water, and whose other end is connected to the LVDT core; the LVDT output voltage enters the amplifier circuit and the amplified voltage is connected to the ADC in the computer. A software program was developed to evaluate the decimal readings of each input voltage and convert this to predicted displacement. To increase the range of the LVDT used, the lever was elongated and marks were placed to represent 1.5:1, 2:1, 3:1 and 4:1 ratios of water displacement to core displacement. 'Their respective expected ranges were directly proportional to the ratio. Test results show that the relationship between actual and predicted displacement was not linear all throughout the expected range of any of the set-ups. All set-ups had a smaller range within which the two parameters just mentioned were directly proportional, but still the higher the ratio used, the greater the linear range achieved. Within these linear ranges, the coefficient of variation was computed. The 2:1 set-up proved to be the most accurate, 3:1, second, 4:1 third, and 1.5:1, the least accurate. Still, the greatest CV computed was 0.07 and thus the general system constructed can be used to measure water level displacements with high accuracy.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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