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The evaluation of phasemeter prototype performance for the space gravitational waves detection.

He-Shan Liu1, Yu-Hui Dong1, Yu-Qiong Li1

  • 1National Microgravity Laboratory (NML), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

The Review of Scientific Instruments
|March 6, 2014
PubMed
Summary

A new digital phase-locked loop phasemeter prototype achieves 2π μrad/√Hz sensitivity for space gravitational wave detection. Noise analysis and experiments detail performance, with thermal drift impacting low frequencies.

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Area of Science:

  • Astrophysics
  • Gravitational Wave Detection
  • Laser Interferometry

Background:

  • Future space missions require advanced readout schemes for gravitational wave detection.
  • Heterodyne laser interferometry is a leading candidate for detecting subtle phase variances.
  • Phasemeters are critical for extracting gravitational wave signals from beat notes.

Purpose of the Study:

  • To develop and evaluate a prototype phasemeter for space-based gravitational wave detection.
  • To analyze noise sources affecting phasemeter performance.
  • To assess the sensitivity and frequency response of the developed phasemeter.

Main Methods:

  • Development of a digital phase-locked loop (DPLL) based phasemeter prototype.
  • Detailed analysis of noise spectra density sources.

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  • Experimental evaluation of the phasemeter's sensitivity and performance.

    • Main Results:

    • The phasemeter prototype achieved a sensitivity of 2π μrad/√Hz within the 0.04 Hz-10 Hz frequency range.
    • Major noise sources contributing to the noise spectra density were identified and analyzed.
    • Thermal drift was observed to increase noise at frequencies below 0.1 mHz.

    Conclusions:

    • The DPLL-based phasemeter shows promise for future gravitational wave detection missions.
    • Understanding and mitigating noise sources, particularly thermal drift, is crucial for improving sensitivity.
    • The developed prototype demonstrates a viable approach for precise phase measurement in demanding environments.