METHOD TO COMPENSATE FREQUENCY DRIFT IN INTERFEROMETER Russian patent published in 2015 - IPC G01J3/45 G01B9/02 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of optical measurements and relates to the method of compensation of frequency drift in a reference source of energy in a spectrometric device on the basis of a FT-interferometer. The method includes production of data into an arithmetic unit collected in response to a start signal, which was generated to reflect the position of the moving optical element of the interferometer, and representing the reference interferogram, production of data representing a target interferogram recorded by the FT-interferometer in response to the start signal, which was generated to display the position of the moving optical element of the interferometer. The reference and target interferograms are compared in the arithmetic unit to determine the phase shift between interferograms at least in one area far from the central outburst. On the basis of the produced data in the arithmetic unit the mathematical transformation is generated, depending on the value of phase shift or shifts. The mathematical transformation is used to control the action of the spectrometric device to produce an interferogram of a new pattern.

EFFECT: increased accuracy of measurements.

6 cl, 3 dwg