Spectrograph calibration using known light source and Raman scattering
First Claim
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1. A method for calibrating a spectrometer device, comprising:
- a. activating a calibration light source to emit light that is coupled to a light dispersing element;
b. detecting dispersed light from the light dispersing element to produce first spectrum data;
c. modifying a dispersion curve for the light dispersing element based on said first spectrum data to produce a modified dispersion curve;
d. detecting dispersed light produced as a result of activation of a light source that causes Raman scattering to produce second spectrum data;
e. determining spectral line peak positions for a first chemical and for a second chemical in said second spectrum data; and
f. computing calibration data for the spectrometer device from the spectral line peak positions for said first chemical, the spectral line peak positions for said second chemical, the known Raman wavenumber shifts for said first chemical and for said second chemical and said modified dispersion curve.
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Abstract
A method is provided for calibrating a spectrometer device used for Raman scattering analysis. A predetermined dispersion curve for a diffraction grating or spectrograph of the spectrometer device is modified based on spectrum data associated with detected dispersed light from a calibration light source to produce a modified dispersion curve. The wavelength of a Raman light source on a light detection device is determined. Calibration data for the spectrometer device is computed from the Raman line peak positions for the first chemical, the wavelength on the detection device of the Raman light source and the modified dispersion curve.
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Citations
24 Claims
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1. A method for calibrating a spectrometer device, comprising:
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a. activating a calibration light source to emit light that is coupled to a light dispersing element; b. detecting dispersed light from the light dispersing element to produce first spectrum data; c. modifying a dispersion curve for the light dispersing element based on said first spectrum data to produce a modified dispersion curve; d. detecting dispersed light produced as a result of activation of a light source that causes Raman scattering to produce second spectrum data; e. determining spectral line peak positions for a first chemical and for a second chemical in said second spectrum data; and f. computing calibration data for the spectrometer device from the spectral line peak positions for said first chemical, the spectral line peak positions for said second chemical, the known Raman wavenumber shifts for said first chemical and for said second chemical and said modified dispersion curve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for calibrating a spectrometer device used for Raman scattering analysis, comprising:
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a. modifying a dispersion curve for a light dispersing element of the spectrometer device based on first spectrum data associated with dispersed light detected by a detection device to produce a modified dispersion curve; b. determining line peak positions for a first chemical and a second chemical in second spectrum data associated with Raman scattered light detected by said detection device; and c. computing calibration data for the spectrometer device from the line peak positions for said first chemical and for said second chemical, known Raman wavenumber shifts for said first chemical and for second chemical and said modified dispersion curve. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A spectrometer device, comprising:
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a. a light dispersing element; b. a detector that detects light dispersed by said light dispersing element; c. a calibration light source; d. a light source suitable for causing Raman scattering; and e. a control unit coupled to said detector, wherein said control unit calibrates the spectrometer device by; i. modifying a dispersion curve for the light dispersing element based on first spectrum data associated with detected dispersed light from said calibration light source, thereby producing a modified dispersion curve; ii. determining spectral line peak positions for a first chemical and for a second chemical in second spectrum data produced by the detector as result of activation of said light source suitable for causing Raman scattering; and iii. computing calibration data for the spectrometer device from the line peak positions for said first chemical and for said second chemical, known Raman wavenumber shifts for said first chemical and said second chemical and said modified dispersion curve. - View Dependent Claims (21, 22, 23, 24)
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Specification