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Development of an Ultra-precise Digital Phasemeter for the LISA Gravitational Wave Detector
2011 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The first direct detection of gravitational waves is greatly anticipated by scientists since it would lead to a whole new observational spectrum, beyond electromagnetic radiation and highly energetic particles. ESA and NASA are currently planning a space-based gravitational wave detector named LISA, or Laser Interferometer Space Antenna, but key technologies are yet to be developed before such ambitious mission can be realized. In this respect, the Laboratory for Enabling Technologies (LET) at EADS Astrium has been engaged with the development of state-of-the-art enabling technologies for LISA, including the development of an ultra-precise phasemeter. The LISA metrology concept requires the detection of picometer distance variations in the frequency range from 0.1 mHz to 0.1 Hz and with sensitivity of 12 pm/√Hz. Therefore, the phasemeter is required to perform with microradian precision (few μcycles/√Hz). The goal of this work was the development of a FPGA-based digital phasemeter as a technology demonstrator for LISA. As a result, a prototype for the LISA phasemeter was developed which can support up to eight parallel channels. Therefore, it allows for the measurement of phase differences between a pair of quadrant photodiodes, which can be useful for differential wavefront sensing. In addition, an analog compensation scheme for phase noise corrections was investigated. This investigation resulted in the design and fabrication of a pilot tone board for ADC jitter calibration. Finally, it was also demonstrated that, under certain conditions, the phasemeter can operate within the stipulated LISA requirements.

Place, publisher, year, edition, pages
Keyword [en]
Technology, LISA, gravitational wave detector, phasemeter
Keyword [sv]
URN: urn:nbn:se:ltu:diva-49924Local ID: 73aaa166-7134-49c8-9bd1-c639ef700dcdOAI: diva2:1023272
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20110124 (anonymous)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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