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US 2013/0258333 A1Published application
Correction of second-order diffraction effects in fiber-optic-based spectrometers
AssigneeFilmetrics, Inc.
InventorsScott A. CHALMERS, Randall S. GEELS
Life of this patent
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Abstract
Embodiments described herein correct errors in spectrometer outputs due to the presence of second-order light. Embodiments determine a relationship between first-order light and second-order light of the spectrometer output. The relationship is a function of wavelength and an output of the spectrometer due to the first-order light. The relationship is used to determine an estimated contribution of the second-order light to the output. Spectrometer errors introduced by the second-order light are corrected by adjusting the spectrometer output according to the estimated contribution of the second-order light.
Claims33
A system comprising:
- a spectrometer;
- and
- an illumination source coupled to the spectrometer, wherein a relationship is determined between first-order light output and second-order light output of the spectrometer, wherein the relationship is a function of wavelength and first-order light output of the spectrometer, wherein an estimated contribution of the second-order light output of the spectrometer is determined with the relationship, wherein spectrometer errors introduced by the second-order light output are corrected by adjusting the spectrometer output according to the estimated contribution.
A system comprising:
- a spectrometer;
- and
- an illumination source coupled to the spectrometer, wherein a relationship is determined between first-order light output and second-order light output of the spectrometer, wherein the relationship is a function of the first-order light output of the spectrometer, wherein an estimated contribution of the second-order light output of the spectrometer is determined with the relationship, wherein spectrometer errors introduced by the second-order light output are corrected by subtracting the estimated contribution from the spectrometer output.
A method comprising:
- coupling an illumination source to a spectrometer;
- determining a relationship between first-order light and second-order light output by the spectrometer, wherein the relationship is a function of wavelength and an output of the spectrometer due to the first-order light;
- determining by using the relationship an estimated contribution of the second-order light to the output;
- and
- correcting for spectrometer errors introduced by the second-order light by adjusting the spectrometer output according to the estimated contribution of the second-order light.
2 more elements
A method comprising:
- determining a relationship between first-order light and second-order light output by the spectrometer, wherein the relationship is a function of an output of the spectrometer due to the first-order light;
- determining by using the relationship an estimated contribution of the second-order light to the output;
- and
- correcting for spectrometer errors introduced by the second-order light by subtracting the estimated contribution from the spectrometer output.
1 more element
A method comprising:
- controlling an illumination source of a spectrometer to prevent admission of first-order light in a wavelength range that comprises second-order light;
- determining for wavelengths within the wavelength range a relationship between an output of the spectrometer due to first-order light and the output due to second-order light;
- determining with use of the relationship an expected amount of second-order light at each of the wavelengths;
- and
- correcting for spectrometer errors due to presence of the second-order light by adjusting the spectrometer output according to the expected amount of the second-order light.
2 more elements
A method comprising:
- determining spectrometer output absent first-order light input in a wavelength range where there exists second-order light;
- determining for the wavelength range a relationship between the spectrometer output due to the first-order light and spectrometer output due to second-order light at each wavelength where there exists second-order light;
- and
- correcting for the second-order light by using the relationship to calculate an expected amount of the second-order light at each wavelength, and subtracting the expected amount of the second-order light from the spectrometer output at each wavelength.
1 more element
Dependencies are inferred from the claim text.