Patent ID: 7440107

Claim:
A spectrophotometer comprising an interferometer configured to produce, from a light beam entering said spectrophotometer, a sample of an interferogram according to fixed values of an optical path length difference, wherein said values of optical path length difference exhibit variable successive spacings that are adapted so that a spectral distribution of the light in the beam is evaluated from the following set of equations: ∑ k = 1 k = N ⁢ A k × cos ⁡ ( 2 ⁢ π ⁢ × f k × δ i ) = M i for each integer i from 1 to N, N being the number of light intensity measurements in the interferogram sample, and where M i is the i-th measurement of light intensity of the interferogram sample, δ i is the value of the optical path length difference corresponding to the measurement M i , f k is a mean frequency corresponding to a spectral component of the light in the beam, k being an integer from 1 to N making it possible to identify N different frequencies f k , and A k is an intensity of the spectral component of the beam corresponding to the frequency f k .