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Construction of a Watt balance that is calibrated by the use of a silicon photodetector
Umeå University, Faculty of Science and Technology, Department of Physics.
2016 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

In this experiment, we build a Watt balance that uses a silicon photodetector and a HeNe laser beam to measure the position of the weighting pans. The Watt balance is built using a laboratory balance and two coils attached to the pans are positioned in a magnetic field of two magnets. The signals are collected using LabView program, Ni acquisition board, and Agilent measurement unit. The balance allows us to measure masses using current, without the need of calibrated masses. We have calibrated the balance obtaining the coil B value of BL=4.83 Vs/m, and measured masses from 5 mg to 300 mg. For the masses, we measured that the accuracy is 1.2% as compared with the true masses.

Place, publisher, year, edition, pages
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:umu:diva-122049OAI: diva2:936832
Subject / course
Fysik C - Examensarbete
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-06-14Bibliographically approved

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