Hand-held microcontroller- based instrument for detection of lahars and pyroclastic materials

Date

3-2003

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

A highly sensitive and stable magnetic detection instrument with directional capabilities was developed to measure the magnitude and direction of the magnetic field stored in pyroclastic flows and lahars. The 3517 Allegro sensor used in the instrument was based on the fluxgate, hall-effect principle. An amplifier circuit was constructed to condition the signal from the sensor The instrument was interfaced to an AT90S8515 microcontroller using a 12-bit analog to digital converter (ADC). A software program was developed using Image Craft C programming language for processing and display of data to a liquid crystal display (LCD). The instrument was calibrated by applying different magnetic field intensities and was tested on rock samples in Buyuan channel, Mayon Volcano. Brgy. Buyuan. Legaspi City. The instrument was successfully used in detecting pyroclastic flows and lahars present along the Buyuan channel through measurement of the intensity and direction of their magnetic fields.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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