An interferometric detection method comprising the following steps: a) taking a first interferometric measurement on an observation region (R, R1) of an interferometer where said interferometer is adapted for receiving an input light beam and provides an output beam resulting from interrogating the observation region (R, R1), where said first interferometric measurement is taken by exciting the interferometer with a light beam which is at least in a wavelength range [ λ 1, λ 2]; b) characterizing the observation region (R, R1) of the interferometer by means of a function I ref Interferometric λ 1 λ 2, which represents the measured intensity modulated by the interferometer at the output of the interferometer as a function of the exciting light beam wavelength; c) conducting an experiment susceptible to modifying the observation region either on the observation region of the interferometer used in the first measurement or on a second observation region interferometrically equivalent to the first observation region; d) taking a second interferometric measurement by characterizing the modified observation region (R, R2) of the interferometer during the experiment by means of a function I out Interferometric λ 1 λ 2, which represents the measured intensity modulated by the interferometer at the output of the interferometer as a function of the exciting light beam wavelength, where in this second interferometric measurement the exciting light beam shows the same spectrum as the exciting light used in the first measurement in at least the wavelength range [ λ 1, λ 2]; e) constructing a transduction function f trans resulting from the quotient f trans λ 1 λ 2 = I out Interferometric λ 1 λ 2 I ref Interferometric λ 1 λ 2 characterized in that the method further comprises the following steps: f) establishing a measurement parameter on function f trans to determine the degree of modification of the observation region, wherein the measurement parameter is selected among the following: ∘ the amplitude of one of the peaks of function f trans, preferably of a peak corresponding to a smaller wavelength, ∘ the peak-to-peak amplitude between two consecutive peaks of function f trans, ∘ the slope (α) in the flank of a peak in function f trans; or, ∘ the variation of the area under the curve f trans [ λ a, λ b], where the range [ λ a, λ b] is a sub-range of [ λ 1, λ 2]; g) providing the value of the measurement parameter measured on function f trans obtained in step f). a) taking a first interferometric measurement on an observation region (R, R1) of an interferometer where said interferometer is adapted for receiving an input light beam and provides an output beam resulting from interrogating the observation region (R, R1), where said first interferometric measurement is taken by exciting the interferometer with a light beam which is at least in a wavelength range [ λ 1, λ 2]; b) characterizing the observation region (R, R1) of the interferometer by means of a function I ref Interferometric λ 1 λ 2, which represents the measured intensity modulated by the interferometer at the output of the interferometer as a function of the exciting light beam wavelength; c) conducting an experiment susceptible to modifying the observation region either on the observation region of the interferometer used in the first measurement or on a second observation region interferometrically equivalent to the first observation region; d) taking a second interferometric measurement by characterizing the modified observation region (R, R2) of the interferometer during the experiment by means of a function I out Interferometric λ 1 λ 2, which represents the measured intensity modulated by the interferometer at the output of the interferometer as a function of the exciting light beam wavelength, where in this second interferometric measurement the exciting light beam shows the same spectrum as the exciting light used in the first measurement in at least the wavelength range [ λ 1, λ 2]; e) constructing a transduction function f trans resulting from the quotient f trans λ 1 λ 2 = I out Interferometric λ 1 λ 2 I ref Interferometric λ 1 λ 2 characterized in that the method further comprises the following f) establishing a measurement parameter on function f trans to determine the degree of modification of the observation region, wherein the measurement parameter is selected among the following: ∘ the amplitude of one of the peaks of function f trans, preferably of a peak corresponding to a smaller wavelength, ∘ the peak-to-peak amplitude between two consecutive peaks of function f trans, ∘ the slope (α) in the flank of a peak in function f trans; or, ∘ the variation of the area under the curve f trans [ λ a, λ b], where the range [ λ a, λ b] is a sub-range of [ λ 1, λ 2]; ∘ the amplitude of one of the peaks of function f trans, preferably of a peak corresponding to a smaller wavelength, ∘ the peak-to-peak amplitude between two consecutive peaks of function f trans, ∘ the slope (α) in the flank of a peak in function f trans; or, ∘ the variation of the area under the curve f trans [ λ a, λ b], where the range [ λ a, λ b] is a sub-range of [ λ 1, λ 2]; g) providing the value of the measurement parameter measured on function f trans obtained in step f).