| 主权项 |
1. Method for measuring the spatial and velocity distribution of scattering structures of a sample of semitransparent matter comprising the steps of
acquiring sequentially a plurality of spectral optical coherence tomography spectra I(k) comprising data belonging to a real image and data belonging to a mirror image, for which time intervals between two recordings are known so that a data set I(k, t) representing the time dependence of the recorded spectra is generated, transforming said data set I(k, t) to a data set I(z, v) by performing a k-z transformation and a t-v transformation, where z represents the positions of back-scattering structures of the sample along the axis of the incident light and v represents the velocity component along said the axis of back-scattering structures of the sample, the method comprising: selecting a velocity vD such that, after said t-v transformation, the range for v for all data belonging to the real image does not overlap with the range for v for all data belonging to the mirror image, wherein vMin≦vD<vDetMax wherein vMin is the minimum velocity producing a detectable phase difference between the data belonging to the real image and the data belonging to the mirror image and wherein for a time interval Δt between recordings of the spectra I(k), the maximum velocity vDetMax is π/(2k0Δt), where k0 is the central wavenumber, or maximum velocity vDetMax is π(2kMaxΔt), where kmax is the maximum wave number of the spectrum used for the measurement, imposing a Doppler shift on a light, whereby a sample light and a reference light used in the method appear at a point of recombination as originating from sources moving relatively to each other with the selected velocity vD, characterized in that the Doppler shift is imposed by reflecting the light with a mirror moving with a velocity component vD along the axis of the reflected light. |
