Photovoltage-distance measurements under compressed-aid and low vacuum conditions

Date

3-1997

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Demetrio A Yco, Jr.

Abstract

Measurements of the photovoltage-distance under compressed air and vacuum conditions were conducted. A dual purpose chamber was designed and fabricated to serve as environment for measurements. A photometer was also constructed to perform the current-to-voltage conversion mechanism. Compressed air was introduced inside the chamber at gauge pressures of 0 psi, 25 psi and 50 psi. The vacuum conditions of -33.3 kpa, -66.6 kpa and -100 kpa was obtained by utilizing gas compressor system. Measurements of the distance and voltage generated from the photometer were conducted under these conditions. Comparison of the results were also performed at different set-ups. Analysis of all data obtained were done by conducting Analysis of Variance (ANOVA) and curve fitting test. Results showed that pressure variations both below and above atmospheric condition have no very significant influence in the relationship between voltage and distance. However, comparison between the data obtained under vacuum condition and under the influence of compressed air has shown significant differences in the photovoltage-distance dependence. This proved that in a vacuum condition, efficient photodetection occurs due to unaffected current-to-voltage conversion mechanism. An interpretation of the Inverse-Square Law could be depicted at certain distances in the graphs of the results.

In all the data obtained, photovoltage-distance relationship can be best described by the equation,

V = k , at I, < = X < =12 In (V) = A + B*In (X). at X>12 where, k is a constant 1, and 12 are the distances.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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