SPECTRUM CORRECTION DEVICE, SPECTRUM CORRECTION METHOD, AND NON-TRANSITORY COMPUTER READABLE STORAGE MEDIUM

• US 20190323887A1
• Filed: 04/15/2019
• Published: 10/24/2019
• Est. Priority Date: 04/23/2018
• Status: Active Grant

• Current Assignee: Yokogawa Electric Corporation, Yokogawa Test & Measurement Corporation (Yokogawa Electric Corporation)
• Original Assignee: Yokogawa Electric Corporation
• Inventors: ISHIHARA, Gentaro, KOJIMA, Manabu
• Granted Patent: US 10,983,004 B2
• Time in Patent Office: Days
• CPC Class Codes: G01J 3/0297 Constructional arrangements for removing other types of optical noise or for performing calibration
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: G01J 3/2803 using photoelectric array detector

Abstract

A spectrum correction device includes an analyzer configured to analyze a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum, a corrector configured to perform a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer, and a synthesizer configured to synthesize the spectrum data corrected by the corrector.

Claims

1. A spectrum correction device comprising:

an analyzer configured to analyze a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum;

a corrector configured to perform a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer; and

a synthesizer configured to synthesize the spectrum data corrected by the corrector.

2. The spectrum correction device according to claim 1,

wherein the corrector is configured to perform the correction process using a correction method selected from a plurality of correction methods prepared in advance in accordance with the shape of the optical spectrum based on the analysis result of the analyzer.

3. The spectrum correction device according to claim 2,

wherein a first correction method for correcting a wavelength resolution of the optical spectrum and a second correction method for correcting the shape of the optical spectrum by expanding or contracting the optical spectrum in a wavelength axis direction or a frequency axis direction are prepared in the corrector.

4. The spectrum correction device according to claim 3,

wherein the corrector is configured to select the first correction method or the second correction method to perform the correction process in accordance with a slope of the optical spectrum analyzed by the analyzer.

5. The spectrum correction device according to claim 4,

wherein the corrector is configured to select the first correction method to perform the correction process for a portion where an absolute value of the slope of the optical spectrum is equal to or less than a predetermined threshold value, and

wherein the corrector is configured to select the second correction method to perform the correction process for a portion where the absolute value of the slope of the optical spectrum is greater than the threshold value.

6. The spectrum correction device according to claim 2,

wherein the corrector is configured to perform the correction process in accordance with a result of comparison between an absolute value of the slope of the optical spectrum and a plurality of predetermined threshold values, using a correction method selected from a plurality of correction methods prepared in advance in accordance with the shape of the optical spectrum.

7. The spectrum correction device according to claim 5,

wherein the threshold value is set in accordance with characteristics of a spectroscope used for measurement of the light to be measured.

8. The spectrum correction device according to claim 1,

wherein the synthesizer is configured to synthesize the spectrum data corrected by the corrector so that a discontinuity does not occur in the optical spectrum after synthesizing.

9. The spectrum correction device according to claim 8,

wherein the synthesizer is configured to process at least a part of the spectrum data corrected by the corrector in an optical power axis direction so that the discontinuity does not occur.

10. The spectrum correction device according to claim 2,

wherein the corrector is configured to perform the correction process using a correction method selected from a plurality of correction methods prepared in advance in accordance with an amount of noise components superposed on the optical spectrum analyzed by the analyzer.

11. A spectrum correction method comprising:

analyzing, by an analyzer, a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum;

performing, by a corrector, a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer; and

synthesizing, by a synthesizer, the spectrum data corrected by the corrector.

12. The spectrum correction method according to claim 11, further comprising:

performing, by the corrector, the correction process using a correction method selected from a plurality of correction methods prepared in advance in accordance with the shape of the optical spectrum based on the analysis result of the analyzer.

13. The spectrum correction method according to claim 12,

wherein a first correction method for correcting a wavelength resolution of the optical spectrum and a second correction method for correcting the shape of the optical spectrum by expanding or contracting the optical spectrum in a wavelength axis direction or a frequency axis direction are prepared in the corrector.

14. The spectrum correction method according to claim 13, further comprising:

selecting, by the corrector, the first correction method or the second correction method to perform the correction process in accordance with a slope of the optical spectrum analyzed by the analyzer.

15. The spectrum correction method according to claim 14, further comprising:

selecting, by the corrector, the first correction method to perform the correction process for a portion where an absolute value of the slope of the optical spectrum is equal to or less than a predetermined threshold value; and

selecting, by the corrector, the second correction method to perform the correction process for a portion where the absolute value of the slope of the optical spectrum is greater than the threshold value.

16. The spectrum correction method according to claim 12, further comprising:

performing, by the corrector, the correction process in accordance with a result of comparison between an absolute value of the slope of the optical spectrum and a plurality of predetermined threshold values, using a correction method selected from a plurality of correction methods prepared in advance in accordance with the shape of the optical spectrum.

17. The spectrum correction method according to claim 15,

wherein the threshold value is set in accordance with characteristics of a spectroscope used for measurement of the light to be measured.

18. The spectrum correction method according to claim 11, further comprising:

synthesizing, by the synthesizer, the spectrum data corrected by the corrector so that a discontinuity does not occur in the optical spectrum after synthesizing.

19. The spectrum correction method according to claim 18, further comprising:

processing, by the synthesizer, at least a part of the spectrum data corrected by the corrector in an optical power axis direction so that the discontinuity does not occur.

20. A non-transitory computer readable storage medium storing one or more spectrum correction programs configured for execution by a computer, the one or more spectrum correction programs comprising instructions for:

analyzing, by an analyzer, a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum;

performing, by a corrector, a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer; and

synthesizing, by a synthesizer, the spectrum data corrected by the corrector.