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A simple pendulum laser interferometer for determining the gravitational constant.

Harold V Parks1, James E Faller2

  • 1JILA, University of Colorado and National Institute of Standards and Technology, Boulder, CO 80309, USA Sandia National Laboratories, Albuquerque, NM 87185, USA harold.parks@nrc-cnrc.gc.ca.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|September 10, 2014
PubMed
Summary
This summary is machine-generated.

Scientists measured the Newtonian constant of gravitation (G) using a suspended laser interferometer. This experiment utilized two pendulums and a laser to detect minute changes in gravitational force.

Keywords:
Fabry–Perot interfometergravitational constantphysical constantsprecision measurement

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Area of Science:

  • Experimental Physics
  • Gravitational Physics
  • Metrology

Background:

  • The Newtonian constant of gravitation (G) is a fundamental constant in physics.
  • Precise measurement of G is crucial for testing gravitational theories and understanding the universe.
  • Previous experiments have faced challenges in achieving high precision.

Purpose of the Study:

  • To measure the Newtonian constant of gravitation (G) with a novel suspended laser interferometer apparatus.
  • To refine experimental techniques for gravitational constant determination.

Main Methods:

  • Employed a suspended laser interferometer with two simple pendulums (72 cm length, 34 cm separation).
  • Utilized a Fabry-Perot cavity formed by mirrors on pendulum bobs.
  • Measured pendulum separation changes using a locked laser as a gravitational field was modulated by displacing tungsten masses (120 kg each).

Main Results:

  • Detailed account of the 2004 experimental setup and procedure.
  • Data analysis focused on detecting gravitational field-induced changes in pendulum separation.

Conclusions:

  • The experiment provided a method for measuring the gravitational constant using laser interferometry.
  • The findings contribute to the ongoing effort to precisely determine the Newtonian constant of gravitation.