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Errors and mistakes in surveying refer to inaccuracies in measurements and data recording. The errors are deviations from the actual value caused by human sensory limitations, equipment flaws, or environmental effects. These errors are typically unintentional and can result from the inherent imperfections in the instruments used, atmospheric conditions, or the observer’s inability to perceive exact measurements. On the other hand, mistakes are caused by the surveyor's lack of...
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Selected Errors in Spatial Measurements of Surface Asperities.

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Summary

Thermal stabilization is crucial for accurate surface roughness measurements using contact profilometry. Allowing 6-12 hours for thermal stabilization significantly reduces probe positioning errors, improving measurement reliability.

Keywords:
center of gravityelongationinterferometric measurementinterior thermal influencessurface asperitiesthermal errors

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Area of Science:

  • Metrology
  • Mechanical Engineering

Background:

  • Contact profilometry is widely used for surface roughness measurement.
  • Internal heat sources in measurement devices can cause thermal expansion, leading to errors.
  • Understanding these errors is vital for accurate spatial measurements.

Purpose of the Study:

  • To investigate the impact of internal heat sources on the thermal expansion of a contact profilometer's X-axis drive.
  • To quantify the synchronization error caused by thermal instability.
  • To assess the effect of probe movement on structural rigidity and surface leveling.

Main Methods:

  • Thermographic studies were employed to analyze thermal stabilization.
  • Laser interferometry was used to measure structural rigidity and leveling changes.
  • Contact profilometry was utilized to evaluate surface roughness measurement errors.

Main Results:

  • Initial synchronization errors reached 16.1 µm on a thermally unstable device.
  • Full thermal stabilization of the drive requires 6-12 hours.
  • Thermal stabilization significantly reduced X-axis probe positioning errors.
  • Profilometer structure vulnerability was measured at 0.8 µm over a 25 mm section due to center of gravity shifts.

Conclusions:

  • Adequate thermal stabilization is essential to minimize errors in contact profilometry.
  • Individual thermal stabilization times should be determined for specific device variants.
  • Accounting for thermal effects and structural rigidity improves the accuracy of surface geometry evaluation.