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Construction of a Watt balance that is calibrated by the use of a position sensitive detector
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]

We have constructed a Watt balance using a laboratory balance and HeNe laser. The balance is calibrated using a position sensitive detector and allows measurements of the absolute mass without the need of calibrated masses. The signals are measured using National Instruments data acquisition board, Agilent measuring unit, and a LabView program. We have performed test measurements of masses in the range from 5 mg to 300 mg. We find that the accuracy of the Watt balance is 3% and that it is limited by the mechanical stability of the laboratory optical table, measurement of the distance and position of the laser beam, and the current measured in the amperometer.

Place, publisher, year, edition, pages
National Category
Atom and Molecular Physics and Optics
URN: urn:nbn:se:umu:diva-122050OAI: diva2:936838
Subject / course
Fysik C - Examensarbete
Available from: 2016-06-14 Created: 2016-06-14 Last updated: 2016-06-14Bibliographically approved

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