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Ultra-low frequency vertical vibration isolator based on LaCoste spring linkage.

G Li1, H Hu1, K Wu1

  • 1Joint Institute for Measurement Science, Tsinghua University, Beijing 100084, China.

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This study presents an ultra-low frequency vibration isolator for precision measurements. The novel design significantly improves absolute gravimeter performance, achieving 2 μGal uncertainty.

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Area of Science:

  • Geophysics
  • Mechanical Engineering
  • Instrumentation

Background:

  • Precision measurements, such as absolute gravimetry, are sensitive to environmental vibrations.
  • Existing vibration isolation systems may not meet the stringent requirements for ultra-high precision measurements.

Purpose of the Study:

  • To design and build an ultra-low frequency vertical vibration isolator for applications in precision measurement.
  • To evaluate the vibration isolation performance of the developed system for absolute gravimetry.

Main Methods:

  • A LaCoste spring linkage mechanism was employed, suspending a test mass with a feedback-controlled system.
  • Optical reflection detected arm displacement, enabling a feedback control force to maintain balance.
  • Dynamic characteristics of the spring linkage were analyzed to adjust the natural oscillating period.

Main Results:

  • The vibration isolator achieved a natural oscillating period of up to 32 seconds.
  • Testing with the T-1 absolute gravimeter resulted in a statistical uncertainty of 2 μGal within 12 hours.
  • The system demonstrated significant vibration isolation capabilities.

Conclusions:

  • The developed ultra-low frequency vibration isolator is highly effective for high-precision absolute gravity measurements.
  • The feedback control mechanism successfully corrects for systematic drift, including temperature variations.
  • The isolator's performance validates its suitability for demanding geophysical applications.