Flux measurement of light using microcomputer-based instrumentation and analysis

Date

6-1999

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Terencio D. Lacuesta

Abstract

An experiment was designed, implemented, and evaluated to measure the flux of light using a photodiode. The entire setup was interfaced to a microcomputer for an automated control and data recording of the experiment. The response of the photodiode to a 55W Halogen lamp and a 100W Xenon lamp was analyzed. The intensity per unit area of the light source was deduced from the data obtained from the transducer response. Several experimental conditions were considered such as: 1) There is an excess voltage signal coming from the operational amplifier caused by the noise coming from the photodiode and the op-amp; 2) The grating efficiency of the monochromator is not uniformly distributed along the specified wavelength range; and 3) The response of the photodiode varies along its effective wavelength range. The effect of these conditions on the experiment were analyzed using computational analysis methods. Results showed that the halogen lamp showed a generally higher flux compared to that of the Xenon Lamp. However, the Xenon Lamp have a relatively higher flux measured along the visible regions. There were no significant readings obtained for both samples along the ultraviolet regions. The experiment showed that the sensor was most effective along the visible and higher infrared range (770-1064 nanometers).

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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