公开(公告)号：US11614402B2

公开(公告)日：2023-03-28

申请号：US16813495

申请日：2020-03-09

申请人： The Regents of the University of Colorado, a body corporate

发明人： Amanda Makowiecki ,  Ryan Cole ,  Nazanin Hoghooghi ,  Greg Rieker

IPC分类号： G01N21/39 ,  G01N21/359 ,  G01N21/3504 ,  G01J3/28 ,  G01N21/27

摘要： A system for recording transmission spectra of a sample with a spectrometer that produces baseline-free molecular response signal. A method for producing baseline-free signals includes applying a logarithmic function to a measured transmission spectrum to form an intermediate spectrum. Applying an inverse Fourier transform to the intermediate spectrum generates a modified free-induction-decay (m-FID) signal, which allows for the separation of molecular absorption features from baseline effects present in the m-FID signal. A weighting function is then applied that suppresses temporal portions of the m-FID signal that correspond to sources of baseline fluctuations as well as periodic effects (e.g. etalons). The method generates a baseline-suppressed m-FID signal that is converted to an absorption spectrum, which exhibits suppressed contributions from baseline fluctuations and periodic effects. When this method is combined with a spectral fitting model it generates measurements of physical properties of the sample without requiring correction for the light source intensity.

公开(公告)号：US20200284723A1

公开(公告)日：2020-09-10

申请号：US16813495

申请日：2020-03-09

申请人： The Regents of the University of Colorado, a body corporate

发明人： Amanda Makowiecki ,  Ryan Cole ,  Nazanin Hoghooghi ,  Greg Rieker

IPC分类号： G01N21/39 ,  G01N21/3504 ,  G01N21/359

摘要： A system for recording transmission spectra of a sample with a spectrometer that produces baseline-free molecular response signal. A method for producing baseline-free signals includes applying a logarithmic function to a measured transmission spectrum to form an intermediate spectrum. Applying an inverse Fourier transform to the intermediate spectrum generates a modified free-induction-decay (m-FID) signal, which allows for the separation of molecular absorption features from baseline effects present in the m-FID signal. A weighting function is then applied that suppresses temporal portions of the m-FID signal that correspond to sources of baseline fluctuations as well as periodic effects (e.g. etalons). The method generates a baseline-suppressed m-FID signal that is converted to an absorption spectrum, which exhibits suppressed contributions from baseline fluctuations and periodic effects. When this method is combined with a spectral fitting model it generates measurements of physical properties of the sample without requiring correction for the light source intensity.