Photovoltage-distance measurements using a constructed interference-free photometer

Date

4-1994

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Demetrio A Yco, Jr.

Abstract

An interference-free photometer capable of measuring the photovoltage-distance relationship was designed, constructed, and implemented in this study. Part of the study was the design and construction of a high voltage power supply for the light source. The power supply has an output voltage of 3000 volts and input electrical power of 100 watts. A jiffy jack was designed and constructed to be the stand and platform of the readily available phototransistor. The jack has an open height of 10 inches and a close height of 2 inches. Also designed and constructed was the stand and an adjustable housing of the light source. A characteristic photovoltage-distance relationship for the phototransistor used is obtained in the form of V = 0.157d2 -9.17 where V is the voltage output and d is the distance of the phototransistor from the light source. The above equation can be proven theoretically using three different laws: (i) the illuminance inverse square law, (ii) the photogenerated current equation and (iii) the I-V characteristic equation of a p-n junction of such semiconductor devices as photodiodes, phototransistors, photovoltaic or solar cells.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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