Patent ID: 10627210

Abstract:
A method for interferometrically determining geometric and/or optical parameters of a cavity comprises the method steps of: tuning the frequency f of a coherent light source (10) over a frequency range Δf, deriving a target beam and a reference beam from the coherent light source (10), wherein the target beam passes through the cavity at least once, generating an interference signal I(f) which is dependent on the frequency f of the light source by superimposing the reference beam on the target beam, capturing an interference spectrum of the interference signal I(f) over the frequency range Δf of the frequency f of the coherent light source, evaluating a plurality of measurement points of the captured interference spectrum over the frequency range Δf by numerically fitting the measurement points to a mathematical function produced, and determining the geometric and/or optical parameters of the cavity (40, 45) by determining the parameters of the mathematical function produced.