Abstract
We develop a new calibration method for minimizing the uncertainty and for establishing the uncertainty traceability of laser velocimetry, especially for laser Doppler velocimetry (LDV). Former calibration methods had uncertainties larger than the lower uncertainty limit of an LDV. With the new method, the uncertainty can be reduced using multiple scattering objects attached on a rotating disk. The working principle is based on the linear relationship between the orbit radii and the resulting output signals. A linear regression provides a promising estimate of the true orbit radius and hence the calibration constant. In the present work, we use multiple scattering points along a single slit aperture on a rotating disk. The feasibility was confirmed and the resulting calibration uncertainty was reduced down to 0.2 percent, which is smaller than the lower limit of an LDV uncertainty.
