CN102033049A - Method for measuring absorption hyper-spectrum chart by eliminating environmental stray light interference - Google Patents
Method for measuring absorption hyper-spectrum chart by eliminating environmental stray light interference Download PDFInfo
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- CN102033049A CN102033049A CN 201010619585 CN201010619585A CN102033049A CN 102033049 A CN102033049 A CN 102033049A CN 201010619585 CN201010619585 CN 201010619585 CN 201010619585 A CN201010619585 A CN 201010619585A CN 102033049 A CN102033049 A CN 102033049A
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Abstract
The invention relates to a method for measuring an absorption hyper-spectrum chart by eliminating environmental stray light interference, comprising the following steps: modulating the light beams, which are emitted by a light source, passing by a wave chopper according to a first preset frequency after to obtain the modulated light; irradiating the sample container by the modulated light to obtain the light beams penetrating through the sample container; and analyzing the light beams to obtain the absorption hyper-spectrum chart. By using the method, the absorption hyper-spectrum chart without the environmental stray light interference is obtained, the application range of the absorption hyper-spectrum chart is expanded, and the absorption hyper-spectrum chart of the solution or substance can be measured rapidly and accurately. The method for measuring the absorption hyper-spectrum chart by eliminating the environmental stray light interference can be applied to the medical field, the environmental protection field and other related fields.
Description
Technical field
The present invention relates to absorbing the measurement of hyper-spectral, particularly a kind of absorption hyper-spectral measuring method of eliminating the environment interference of stray light can be measured the absorption hyper-spectral of solution or material quickly, accurately.
Background technology
The absorption spectrum of measuring solution or material is to analyze its composition or the most frequently used method of structure, but the environment parasitic light can form the interference to absorption spectrum in measuring process, thereby conventional measurement is to carry out in the measurement cell of instrument sealing, thereby higher to measuring condition and environmental requirement, be not easy in the open air or some specific conditions under measure.Moreover, only measure the composition that transmission absorption spectrum also is difficult to Analysis of Complex solution accurately or material.
Summary of the invention
Interference for fear of the environment parasitic light, enlarge range of application, measure the absorption hyper-spectral of solution or material quickly, accurately, the invention provides a kind of absorption hyper-spectral measuring method of eliminating the environment interference of stray light, said method comprising the steps of:
(1) light beam that sends of light source is modulated light according to first predeterminated frequency through chopper, obtains the light after the modulation;
(2) illumination after the described modulation is mapped on the planchet, obtains the light beam that sees through described planchet;
(3) described light beam is analyzed, obtained the absorption hyper-spectral.
Illumination after the described modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through described planchet, is specially:
Light after the described modulation shines on the described planchet by slit, obtains the light beam that sees through described planchet.
Illumination after the described modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through described planchet, is specially:
Light after the described modulation is fiber-optic illuminated to described planchet by second, obtains the light beam that sees through described planchet.
Described second optical fiber is specially: light-conductive optic fibre.
Described in the step (3) analyzed described light beam, obtains the absorption hyper-spectral, is specially:
1) described light beam enters detection probe and reaches spectrometer through first optical fiber;
2) described spectrometer carries out continuous sampling with second predeterminated frequency to described light beam under the control of computing machine, obtains the absorption spectrum sequence S on testee surface
i, wherein, the value of i is a positive integer;
3) in described computing machine, according to time sequencing with described absorption spectrum sequence S
iIn the data of same wavelength correspondence
Sort, obtain the light intensity sequence of each wavelength;
4) in described computing machine, the light intensity sequence of each wavelength is carried out Fourier transform, obtain maximum harmonic component
Wherein, the value of j is a positive integer;
5) in described computing machine, according to each wavelength order with described maximum harmonic component
Sort, obtain the absorption spectrum of described detection probe position;
6) described detection probe scans next position, repeated execution of steps 1)～step 5) obtains the absorption spectrum of described detection probe in next position, up to getting access to a complete described absorption hyper-spectral.
Described second predeterminated frequency is specially:
Be higher than the described first predeterminated frequency n doubly, wherein, the value of n is the positive integer greater than 2.
Described maximum harmonic component
Be specially: the identical harmonic component of most wavelength amplitude maximums.
Described light beam is analyzed in the step (3) obtained the absorption hyper-spectral, is specially:
The camera writing light beam, when light source whenever sends a kind of wavelength light, camera record piece image, write down one time with the halo stream output of all wavelengths and by camera, camera obtains an image sequence, and the light intensity sequence of each pixel in the image sequence is sorted, and obtains the light intensity sequence of each wavelength, light intensity sequence to each wavelength is carried out Fourier transform, obtains maximum harmonic component
Maximum harmonic component by pixel position and wavelength
Get access to the absorption hyper-spectral.
Described light beam is analyzed in the step (3) obtained the absorption hyper-spectral, is specially:
Super spectrogram imager writing light beam obtains super spectrogram, arranges the time series that obtains each wavelength in proper order according to pixel and wavelength, and the time series of each wavelength is carried out Fourier transform, obtains maximum harmonic component
Maximum harmonic component by pixel position and wavelength
Get access to the absorption hyper-spectral.
The beneficial effect of technical scheme provided by the invention is:
The invention provides a kind of absorption hyper-spectral measuring method of eliminating the environment interference of stray light, this method has got access to the absorption hyper-spectral of getting rid of the environment interference of stray light, avoided the interference of environment parasitic light, enlarge range of application, realized measuring quickly, accurately the absorption hyper-spectral of solution or material; And the absorption hyper-spectral measuring method of this elimination environment interference of stray light can be applied to medical field, environmental protection field and other relevant fields.
Description of drawings
Fig. 1 is a structural representation provided by the invention;
Fig. 2 is another structural representation provided by the invention;
Fig. 3 is another structural representation provided by the invention;
Fig. 4 is another structural representation provided by the invention;
Fig. 5 is the process flow diagram of the absorption hyper-spectral measuring method of elimination environment interference of stray light provided by the invention.
The list of parts of each label representative is as follows in the accompanying drawing:
1: light source 2: chopper
3: slit 4: planchet
5: 6: the first optical fiber of detection probe
7: spectrometer 8: computing machine
11: hyperspectral imager
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Interference for fear of the environment parasitic light, enlarge range of application, measure quickly, the absorption spectrum of solution or material accurately, the embodiment of the invention provides a kind of absorption hyper-spectral measuring method of eliminating the environment interference of stray light, referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, see for details hereinafter and describe:
101: light beam that light source 1 sends is modulated light according to first predeterminated frequency through chopper 2, obtains the light after the modulation;
102: the illumination after the modulation is mapped on the planchet 4, obtains the light beam through planchet 4;
103: light beam is analyzed, obtained the absorption hyper-spectral.
Promptly got access to the absorption hyper-spectral of eliminating the environment interference of stray light by above-mentioned steps 101-step 103.
Further, the illumination after the modulation in the step 102 is mapped on the planchet 4, obtains the light beam through planchet 4, is specially:
Light after the modulation shines on the planchet 4 by slit 3, obtains the light beam through planchet 4; Or,
Light after the modulation shines on the planchet 4 by second optical fiber 9, obtains the light beam through planchet 4.
Wherein, second optical fiber 9 is specially: light-conductive optic fibre.
Further, light beam is analyzed in the step 103, obtain the absorption hyper-spectral and be specially:
1) light beam enters detection probe 5 and reaches spectrometer 7 through first optical fiber 6;
2) spectrometer 7 carries out continuous sampling with second predeterminated frequency to light beam under the control of computing machine 8, obtains the absorption spectrum sequence S on testee surface
i, wherein, the value of i is a positive integer;
3) in computing machine 8, according to time sequencing with absorption spectrum sequence S
iIn the data of same wavelength correspondence
Sort, obtain the light intensity sequence of each wavelength;
4) in computing machine 8, the light intensity sequence of each wavelength is carried out Fourier transform, obtain maximum harmonic component
Wherein, the value of j is a positive integer;
5) in computing machine 8, according to each wavelength order with maximum harmonic component
Sort, obtain the absorption spectrum of detection probe 5 positions;
6) detection probe 5 scans next position, repeats 1)～5) obtain the absorption spectrum of detection probe 5 in next position, up to getting access to a complete absorption hyper-spectral.
Wherein, second predeterminated frequency is specially: be higher than the first predeterminated frequency n doubly, the value of n is the positive integer greater than 2, and the value of n can be set according to the needs in the practical application, and during specific implementation, the embodiment of the invention does not limit this.Wherein the value of i is a positive integer.
Wherein, maximum harmonic component
Be specially: the identical harmonic component of most wavelength amplitude maximums, the value of j are positive integer.
Further, the light beam to seeing through planchet 4 in the step 103 is analyzed, and obtains the absorption hyper-spectral and is specially:
Further, the light beam to seeing through planchet in the step 103 is analyzed, and obtains the absorption hyper-spectral and is specially:
The feasibility of the absorption hyper-spectral measuring method of elimination environment interference of stray light provided by the invention is described with four specific embodiments below, sees for details hereinafter and describe:
Embodiment 1: as shown in Figure 1, the light beam that light source 1 sends is through chopper 2, the light of being exported is modulated according to first predeterminated frequency, light after the modulation shines on the planchet 4 by slit 3, obtain the light beam that sees through planchet 4, light beam enters detection probe 5 and reaches spectrometer 7 through first optical fiber 6; Spectrometer 7 carries out continuous sampling with second predeterminated frequency to light beam under the control of computing machine 8, obtain the absorption spectrum sequence S on testee surface
i, according to time sequencing with absorption spectrum sequence S
iIn the data of same wavelength correspondence
Sort, obtain the light intensity sequence of each wavelength; Light intensity sequence to each wavelength is carried out Fourier transform, obtains maximum harmonic component
According to each wavelength order with maximum harmonic component
Sort, obtain the absorption spectrum of detection probe 5 positions; Detection probe 5 scans next position, repeats above-mentioned steps, obtains the absorption spectrum of detection probe 5 in next position, and up to obtaining a complete absorption hyper-spectral, this absorption hyper-spectral has been eliminated the environment interference of stray light.
Embodiment 2: as shown in Figure 2, the light beam that light source 1 sends is through chopper 2, the light of being exported is modulated according to first predeterminated frequency, light after the modulation shines on the planchet 4 by second optical fiber 9, obtain the light beam that sees through planchet 4, light beam enters detection probe 5 and reaches spectrometer 7 through first optical fiber 6; Spectrometer 7 carries out continuous sampling with second predeterminated frequency to light beam under the control of computing machine 8, obtain the absorption spectrum sequence S on testee surface
i, according to time sequencing with absorption spectrum sequence S
iIn the data of same wavelength correspondence
Sort, obtain the light intensity sequence of each wavelength; Light intensity sequence to each wavelength is carried out Fourier transform, obtains maximum harmonic component
According to each wavelength order with maximum harmonic component
Sort, obtain the absorption spectrum of detection probe 5 positions; Detection probe 5 scans next position, repeats above-mentioned steps, obtains the absorption spectrum of detection probe 5 in next position, and up to obtaining a complete absorption hyper-spectral, this absorption hyper-spectral has been eliminated the environment interference of stray light.
Embodiment 3: as shown in Figure 3, the light beam that light source 1 sends is through chopper 2, the light of being exported is modulated according to first predeterminated frequency, light after the modulation shines on the planchet 4 by second optical fiber 9, obtain the light beam that sees through planchet 4, camera 10 writing light beams, when light source 1 whenever sends a kind of wavelength light, camera 10 record piece images write down one time with the halo stream output of all wavelengths and by camera 10, and camera 10 obtains an image sequence, light intensity sequence to each pixel in the image sequence sorts, obtain the light intensity sequence of each wavelength, the light intensity sequence of each wavelength is carried out Fourier transform, obtain maximum harmonic component
Maximum harmonic component by pixel position and wavelength
Get access to the absorption hyper-spectral, this absorption hyper-spectral has been eliminated the environment interference of stray light.
Embodiment 4: as shown in Figure 4, the light beam that light source 1 sends is through chopper 2, the light of being exported is modulated according to first predeterminated frequency, light after the modulation shines on the planchet 4 by second optical fiber 9, obtains the light beam through planchet 4, super spectrogram imager 11 writing light beams, obtain super spectrogram, arrange the time series that obtains each wavelength in proper order according to pixel and wavelength, the time series of each wavelength is carried out Fourier transform, obtain maximum harmonic component
Maximum harmonic component by pixel position and wavelength
Get access to the absorption hyper-spectral, this absorption hyper-spectral has been eliminated the environment interference of stray light.
In sum, the embodiment of the invention provides a kind of absorption hyper-spectral measuring method of eliminating the environment interference of stray light, this method has got access to the absorption hyper-spectral of getting rid of the environment interference of stray light, avoided the interference of environment parasitic light, enlarge range of application, realized measuring quickly, accurately the absorption hyper-spectral of solution or material; And the absorption hyper-spectral measuring method of this elimination environment interference of stray light can be applied to medical field, environmental protection field and other relevant fields.
It will be appreciated by those skilled in the art that accompanying drawing is the synoptic diagram of a preferred embodiment, the invention described above embodiment sequence number is not represented the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. an absorption hyper-spectral measuring method of eliminating the environment interference of stray light is characterized in that, said method comprising the steps of:
(1) light beam that sends of light source is modulated light according to first predeterminated frequency through chopper, obtains the light after the modulation;
(2) illumination after the described modulation is mapped on the planchet, obtains the light beam that sees through described planchet;
(3) described light beam is analyzed, obtained the absorption hyper-spectral.
2. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 1 is characterized in that the illumination after the described modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through described planchet, is specially:
Light after the described modulation shines on the described planchet by slit, obtains the light beam that sees through described planchet.
3. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 1 is characterized in that the illumination after the described modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through described planchet, is specially:
Light after the described modulation is fiber-optic illuminated to described planchet by second, obtains the light beam that sees through described planchet.
4. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 2 is characterized in that described second optical fiber is specially: light-conductive optic fibre.
5. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 1 is characterized in that, described in the step (3) analyzed described light beam, obtains the absorption hyper-spectral, is specially:
1) described light beam enters detection probe and reaches spectrometer through first optical fiber;
2) described spectrometer carries out continuous sampling with second predeterminated frequency to described light beam under the control of computing machine, obtains the absorption spectrum sequence S on testee surface
i, wherein, the value of i is a positive integer;
3) in described computing machine, according to time sequencing with described absorption spectrum sequence S
iIn the data of same wavelength correspondence
Sort, obtain the light intensity sequence of each wavelength;
4) in described computing machine, the light intensity sequence of each wavelength is carried out Fourier transform, obtain maximum harmonic component
Wherein, the value of j is a positive integer;
5) in described computing machine, according to each wavelength order with described maximum harmonic component
Sort, obtain the absorption spectrum of described detection probe position;
6) described detection probe scans next position, repeated execution of steps 1)～step 5) obtains the absorption spectrum of described detection probe in next position, up to getting access to a complete described absorption hyper-spectral.
6. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 5 is characterized in that, described second predeterminated frequency is specially: be higher than the described first predeterminated frequency n doubly, wherein, the value of n is the positive integer greater than 2.
7. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 5 is characterized in that, described maximum harmonic component
Be specially: the identical harmonic component of most wavelength amplitude maximums.
8. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 1 is characterized in that, the absorption hyper-spectral is obtained in described light beam is analyzed in the step (3), is specially:
The camera writing light beam, when light source whenever sends a kind of wavelength light, camera record piece image, write down one time with the halo stream output of all wavelengths and by camera, camera obtains an image sequence, and the light intensity sequence of each pixel in the image sequence is sorted, and obtains the light intensity sequence of each wavelength, light intensity sequence to each wavelength is carried out Fourier transform, obtains maximum harmonic component
Maximum harmonic component by pixel position and wavelength
Get access to the absorption hyper-spectral.
9. the absorption hyper-spectral measuring method of elimination environment interference of stray light according to claim 1 is characterized in that, the absorption hyper-spectral is obtained in described light beam is analyzed in the step (3), is specially:
Super spectrogram imager writing light beam obtains super spectrogram, arranges the time series that obtains each wavelength in proper order according to pixel and wavelength, and the time series of each wavelength is carried out Fourier transform, obtains maximum harmonic component
Maximum harmonic component by pixel position and wavelength
Get access to the absorption hyper-spectral.
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| CN103592286A (en) * | 2012-08-13 | 2014-02-19 | 天津精利为科技有限公司 | Method for calculating concentration of interfered element through calculated concentration of element |
| CN107796771A (en) * | 2017-10-19 | 2018-03-13 | 桂林电子科技大学 | Absorb device and measuring method that alanysis instrument eliminates external stray light interference |
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| CN107796771A (en) * | 2017-10-19 | 2018-03-13 | 桂林电子科技大学 | Absorb device and measuring method that alanysis instrument eliminates external stray light interference |
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