2012 BFY Abstract Detail Page

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Abstract Title: W44 - Noise Fundamentals
Abstract: Many instructors, and some students, have heard of Johnson-noise and shot noise in electric circuits, TeachSpin's apparatus provides a way to study both in detail in a trouble-free experimental arena. Students can see electrical noise, and measure spectral noise density, right from its definition. They can investigate, quantitatively, the dependence of Johnson noise on source resistance and bandwidth, as well as on temperature in the 77 - 350 K range using the dewar and proprietary probe provided. A measurement of Boltzmann's constant, to a precision of a few percent, is a by-product. Furthermore, quantitative measurements of the shot noise present in a photocurrent allow the measurement of the fundamental charge 'e' to similar precision.

Participants will:
-- Follow a noise signal from birth to quantitative measurement
-- Learn how noise density is defined and measured
-- See the dependence of Johnson noise on source resistance
-- Deduce a value for Boltzmann's constant from Johnson-noise data
-- Learn how shot noise is generated and measured
Abstract Type: Workshop

Workshop Documents

Workshop Document: Download the Workshop Document
Workshop Document (2): Download the Workshop Document (2)

Author/Organizer Information

Primary Contact: David Van Baak
TeachSpin