icproblems.itmeathatthehighprecisionexperimentsfordeterminingthegravitationalcotantgandinvestigatioonallkindsofsystematicerrorsofthedifferentmethodsaredesirable.inthisthesis,wereportourrecentresearchworkondetermininggandphysicalpropertiesoftorsionpendulum.
hust-99measuringgexperiment.wedeterminedgbymeaofahigh-qandlong-periodtorsionpenduluminthetime-of-swingmethodinhuazhonguniversityofscienceandtechnology(hust),china.two6.25kgcylindricalattractingmaesofthecoerhericaltestma,whichhangsfromoneendofa400.00mmlengthaluminiumbeambya25μmtungstenfiberwhichisabout435mmlong.thecounterweightmaisfixedontheotherendofthebeam.thetorsionpendulumissuendedbya25μmtungstenfiberwhichisabout513mmlong,andenclosedinachamberatavacuumof2×10-5pa.theaaratuswaslocatedinacavelaboratoryinourcampus.theleastthickneofthecoveronthelaboratoryismorethan40m,andtheexitis150mawayfromthelaboratory.thedailychangeoftemperatureinthelaboratoryislethan0.005oc.theperiodsofthependulumwereabout4441and3484swithandwithouttheattractingmaesinthefarposition,reectively,andtheperiodchangewasabout27.theresultofourexperimentisg=(6.6699±0.0007)×10-11m3kg-1s-2withacombinedstandarduncertaintyof105m.themainfeatureofourexperimentisthatthesystematicbiasaoci
atedwiththefiberinelasticity,whichmayhaveafflictedotherpreviousexperiments,canbeavoidedduetoaveryhighqinthependulum.
determinationoffundamentalfrequencyofaphysicaloscillatorbyperiodfittingmethod.inthemostgravitationalexperimentsinlaboratorythemeasurementoftheforceactedona
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