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. Author manuscript; available in PMC: 2017 Jul 5.
Published in final edited form as: Proc Annu Conf Progn Health Manag Soc. 2015;6:036.

Table 4.

Straightness error uncertainties due to sensor noise.

Sensor Axis Speeda Filter Expanded Uncertaintyb Standard Uncertainty
Accelerometer Slow Band-pass (2 Hz, 200 Hz) 0.081 μm 0.015 μm
Accelerometer Moderate Band-pass (1 Hz, 10 Hz) 0.14 μm 0.029 μm
Accelerometer Fast Low-pass (5 Hz) 0.26 μm 0.055 μm
a

‘Slow’ speed = 0.02 m/s, ‘Moderate’ speed = 0.1 m/s, and ‘Fast’ speed = 0.5 m/s

b

defines an interval estimated to have a level of confidence of 99.8 percent