METHOD FOR MULTICHANNEL MEASUREMENT OF LIGHT WAVELENGTH SHIFT USING FABRY-PEROT INTERFEROMETER Russian patent published in 2015 - IPC G01B9/02 G01P3/36 

FIELD: physics.

SUBSTANCE: measurements are taken using a Fabry-Perot interferometer. Light from light sources is guided through a collimating system towards the Fabry-Perot interferometer and an interference pattern is focused by lenses on a recorder. The light guided to the Fabry-Perot interferometer comes from multiple independent sources which illuminate different regions of the interference pattern, and in each region of the interference pattern, blurring of interferometric rings is compensated for, said blurring being caused by misalignment of the mirrors of the interferometer, by replacing, on the recorder, the focal plane with a plane where beams of all interference patterns of a non-parallel Fabry-Perot interferometer intersect, creating a partial pseudo-focus.

EFFECT: enabling simultaneous measurement of shift of frequency of radiation from different independent sources in one channel and sharper interferometric rings on both sides of the centre of the interference pattern.

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