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Construction of a Fiber-Coupled Frequency Modulated DFB-Laser-Based Radar for Measurement of Distances and Velocities
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The report describes the realization of the distance and velocity measurement with a fiber coupled frequency modulated continuous wave (FMCW) laser radar. It focuses on FMCW method and discusses the resolution, measurement range and accuracy of different implementations of radar systems.

For distance measurement, the system with 50 Hz sweep frequency displays the best performance with an absolute error smaller than 1.3 mm over the whole measurement range. The best precision evaluated using the Allan deviation is 0.1 mm at a integration time of 200 ms for a 100 Hz sweep frequency. With higher sweep frequency, the system provides results faster but the measurement range is smaller.

For velocity measurement, systems with 200 mV amplitude and 500 mV amplitude are always better than that with 1 V amplitude. A lower modulation amplitude shows less influence of residual amplitude modulation but less stability of beat signals.

Place, publisher, year, edition, pages
2017.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-142056OAI: oai:DiVA.org:umu-142056DiVA, id: diva2:1158075
Subject / course
Fysik C - Examensarbete
Available from: 2017-11-17 Created: 2017-11-17 Last updated: 2017-11-17Bibliographically approved

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CiteExportLink to record
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