Go to  Advanced Search

Spectral distribution of noise

Show full item record

Files in this item

Files Size Format Description   View
UBC_1950_A7 B2 S7.pdf 1.814Mb Adobe Portable Document Format   View/Open
Title: Spectral distribution of noise
Author: Bain, William Arthur
Degree: Master of Applied Science - MASc
Program: Engineering Physics
Copyright Date: 1950
Subject Keywords Noises
Issue Date: 2012-03-13
Publisher University of British Columbia
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
Abstract: An apparatus for the measurement of noise as a function of frequency is described. This apparatus has been used to determine the spectral distribution of the excess noise caused by the flow of a d-c. current through a resistance. The samples used for the experiments were a zinc oxide semiconductor and two metal layer resistors. The frequency region investigated was from 10 kc. to 400 kc. It was found that the excess noise in the ZnO semiconductor obeyed a 1⁄(ν₂)law at room temperature while at lower temperatures (solid CO₂ and liquid nitrogen) it was proportional to 1/ν at low frequencies and 1⁄(ν₂) high frequencies. The excess noise in the metal layer resistors was proportional to 1⁄ν at room temperatures while at 100°C there was a marked deviation from this law in the direction of a 1⁄ν₂ dependence for high frequencies. The measurements show that the 1⁄ν law gradually changes to a 1⁄ν₂ law at high frequencies in accordance with the theory proposed recently by Dr. A. van der ziel. They also indicate that the correlation times involved are a function of temperature; the exact nature of this dependence has yet to be determined.
Affiliation: Applied Science, Faculty of
URI: http://hdl.handle.net/2429/41367
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893