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NG Figure 4

Figure 4. The nano-Newton torsion balance can be seen within the vacuum chamber below. The balance utilises a highly compliant torsional spring to support the balance beam, the angular displacement of which is measured using a phase shifting homodyne angular interferometer with 633 nm HeNe laser. The entire system is calibrated using an electrostatic fin system which is traceable to national standards. The balance is expected to have a resolution below 10 nanoNewtons under medium vacuum with a range of up to 300 micro-Newtons in this configuration. To help achieve this, the entire balance assembly is constructed from Invar and mounted using slotted pins to mitigate thermal effects.
NG Figure 4
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