Patent ID: 8488124

Claim:
A method for spectral reflectometry comprising at least two consecutive measurements of an interference spectrum, each including the following steps: directing an optical radiation from a broadband light source toward an interferometer, splitting the radiation in the interferometer into a reference and a sample part, registering an interference spectrum of a radiation reflected in a reference path of the interferometer and backscattered from a sample with a spectrometer, processing obtained data by a processing and visualization unit, and eliminating coherent noise artifacts in the spectrum by simultaneous processing data obtained from the at least two consecutive measurements, wherein during one of the at least two measurements of the interference spectrum the phase between the reflected reference radiation and the radiation backscattered from the sample is modulated by a predetermined law by means of an interference control unit during exposure of the photoreceiving elements of the spectrometer, which results in averaging the phase and, hence, zeroing of the cross-correlation (useful) component of the registered spectrum, and wherein during the remaining of the at least two measurements of the interference spectrum, the phase between the interfering parts of the radiation is not modulated during exposure.