Method of Enhancing Spectral Data
A method of enhancing spectral data such as a frequency, wavelength or mass spectrum comprises applying an inverse Fourier Transform to the data in the frequency, wavelength or mass spectrum, zero-filling and, optionally, apodizing that inverse transform data, and then applying a Fourier Transform to convert the inverse data back into the frequency, wavelength or mass domain. The resultant processed spectrum provides a more accurate indication of peak location, shape and height.
1 . A method of enhancing spectral data, said data comprising M discrete intensity values within one of a range of wavelength values, a range of frequency values and a range of mass values, said method comprising:
a) applying a first function to the spectral data to obtain an inverse transform of the spectrum,
b) zero-filling said inverse transform, and
c) applying a second function to the zero-filled inverse transform to obtain a spectrum comprising N discrete intensity values within said range of wavelength, frequency or mass values, wherein N>M.
2 . A method according to claim 1 , further comprising the step of:
i) apodizing said inverse transform, before zero-filling and applying the second function.
3 . A method according to claim 2 , wherein the second function is applied to the apodized zero-filled inverse transform.
4 . A method according to claim 1 or 2 , wherein when the inverse transform is zero-filled by a factor Z, and wherein N is Z times greater than M.
5 . A method according to any preceding claim, wherein the spectral data comprises an atomic emission spectrum.
6 . A method according to claim 1 , 2 or 5 , wherein the spectral data is in the ultra-violet, visible and/or infrared domain.
7 . A method according to any of claims 1 to 4 , wherein the spectral data comprises a mass spectrum.
8 . A method according to any preceding claim, wherein the first function is a Fourier Transform function and second function is an inverse Fourier Transform function.
9 . A method according to any preceding claim, wherein the spectral data and the spectrum are a spectrum in the frequency domain.
10 . A computer program, which when run on a computer, carries out the method according to any preceding claim.
11 . A computer readable medium embodying the computer program of claim 10 .
12 . A processor configured:
(a) to receive spectral data from a spectrometer, the spectral data comprising M discrete intensity values within one of a range of wavelength values, a range of frequency values and a range of mass values;
(b) to apply a first function to the spectral data to obtain an inverse transform of the spectrum,
(c) to zero-fill said inverse transform, and
(d) to apply a second function to the zero-filled inverse transform to obtain a spectrum comprising N discrete intensity values within said one of said ranges of wavelength, frequency and mass values, and wherein N>M.
13 . A spectrometer arranged to generate an array of spectral data comprising M discrete intensity values within one of a range of wavelength values, a range of frequency values and a range of mass values, the spectrometer including the processor of claim 12 .