PC and microcontroller-based spectrophotometer using white led as light source and DVD as diffraction grating.

Date

4-2012

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Nelio C. Altoveros

Abstract

A PC- and microcontroller-based visible light spectrophotometer was built using inexpensive components, designed for educational purposes. A white light-emitting diode (LED) was used as the radiation source and a digital versatile disc (DVD) as the diffraction grating. The main controller of the instrument is a C language-programmed Z8F6421 microcontroller with a Visual Basic Graphic User Interface. The improvised spectrophotometer was characterized by analyzing potassium per-manganate solutions at different concentrations. The results obtained from the instrument were compared with the results from a commercial spectrophotometer using the same solutions. The instrument gave desirable absorbance measurements with a correlation of 0.99 to the concentration values. Though it was designed using in-expensive components, spectrophotometric principles were still followed specifically the Beer-Lambert's Law. PACS: 42.15.Eq[Optical System Design], 07.05.Hd [Data Acquisition: Hardware and Software], 42.25.Fx [Diffraction]

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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