A novel torsion balance for the measurement of the Newtonian gravitational constant
A novel torsion balance for the measurement of the Newtonian gravitational constant
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一种用于测量牛顿引力常数的新型扭力天平
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
C. Speake
中科院分区：
文献类型：
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作者：
T. Quinn;R. S. Davis;C. Speake
利用宽薄扭条在重载下的特殊性质，研制了一种用于测量牛顿引力常数的扭秤。测试质量为四个0.47 kg质量的组件的形式，所述质量悬挂在宽1.25 mm、厚30微米和长80 mm的Cu-Se扭转条上。源质量是四个10 kg质量的组件，可以相对于测试质量转动到不同位置。该系统的初步测试表明，相对较大的重力信号产生的重力信号，在大气压力下的空气中，应该很容易测量到0.1%。正如我们从以前使用扭带的经验中所预期的那样，观察到了极好的零稳定性。不久将进行一次不确定度为1%的G测量，以测试所有系统，并希望在合理的短时间内达到0.1%的不确定度。
A torsion balance has been built for the measurement of the Newtonian gravitational constant that takes advantage of the particular properties of a wide thin torsion strip under heavy load. The test mass is in the form of an assembly of four 0.47 kg masses suspended from a Cu-Se torsion strip 1.25 mm wide and 30 micrometers thick and 80 mm long. The source mass is an assembly of four 10 kg masses that can be turned to different positions with respect to the test masses. Preliminary tests of the system show that the relatively large gravitational signal produces a gravitational signal that, in air at atmospheric pressure, should easily be measurable to 0.1%. As we expect from our previous experience with torsion strips, an excellent zero stability is observed. A measurement of G with an uncertainty of 1% will be made soon to test all the systems and it is hoped to reach an uncertainty of 0.1% within a reasonably short time.