CN102033048B - Measuring method of absorption spectrum for eliminating ambient stray light interference - Google Patents
Measuring method of absorption spectrum for eliminating ambient stray light interference Download PDFInfo
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- CN102033048B CN102033048B CN2010106195791A CN201010619579A CN102033048B CN 102033048 B CN102033048 B CN 102033048B CN 2010106195791 A CN2010106195791 A CN 2010106195791A CN 201010619579 A CN201010619579 A CN 201010619579A CN 102033048 B CN102033048 B CN 102033048B
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Abstract
The invention discloses a measuring method of an absorption spectrum for eliminating ambient stray light interference, which comprises the following steps of: enabling a light beam emitted by a light source to pass through a chopper, and demodulating the light according to a first preset frequency to obtain demodulated light; irradiating the demodulated light to a sample vessel to obtain a light beam penetrating through the sample vessel; enabling the light beam to enter a first optical fiber to be transmitted to a spectrograph; continuously sampling the light beam by the spectrograph under the control of a computer according to the second preset frequency to obtain an absorption spectrum sequence Si of the surface of an object to be measured; in the computer, sequencing data corresponding to the same wavelength in the absorption spectrum sequence Si according to the time sequence to obtain a light intensity sequence of each wavelength; in the computer, carrying out Fourier transform on the light intensity sequence of each wavelength to obtain the maximum harmonic component; and in the computer, sequencing the maximum harmonic component according to each wavelength sequence to obtain an absorption spectrum. The absorption spectrum eliminates the ambient stray light interference and has larger application range.
Description
Technical field
The present invention relates to the measurement to absorption spectrum, particularly a kind of absorption spectrum measuring method of eliminating the environment interference of stray light can be measured the absorption spectrum 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 in the measurement cell of instrument sealing, to carry out; Thereby higher to measuring condition and environmental requirement, be not easy in the open air or some specific conditions under measure.
Summary of the invention
For fear of the interference of environment parasitic light, the expanding application scope is measured the absorption spectrum of solution or material quickly, accurately, the invention provides a kind of absorption spectrum 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 said modulation is mapped on the planchet, obtains the light beam that sees through said planchet;
(3) said light beam gets into first optical fiber and reaches spectrometer;
(4) said spectrometer carries out continuous sampling with second predeterminated frequency to said 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;
(5) in said computing machine, according to time sequencing with said absorption spectrum sequence S
iIn the corresponding data of same wavelength
Sort, obtain the light intensity sequence of each wavelength;
(6) in said computing machine; Light intensity sequence to said each wavelength is carried out Fourier transform; Obtain maximum harmonic component
wherein, the value of j is a positive integer;
(7) in said computing machine; According to each wavelength order said maximum harmonic component
is sorted, obtain absorption spectrum.
Illumination after the said modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through said planchet, is specially:
Light after the said modulation shines on the said planchet through slit, obtains the light beam that sees through said planchet.
Illumination after the said modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through said planchet, is specially:
Light after the said modulation is fiber-optic illuminated to said planchet through second, obtains the light beam that sees through said planchet.
Said second optical fiber is specially: light-conductive optic fibre.
Second predeterminated frequency is specially described in the step (4): be higher than the said first predeterminated frequency n doubly, wherein, the value of n is the positive integer greater than 2.
Said maximum harmonic component
is specially: the identical harmonic component that most wavelength amplitudes are maximum.
The beneficial effect of technical scheme provided by the invention is:
The invention provides a kind of absorption spectrum measuring method of eliminating the environment interference of stray light; This method has got access to the absorption spectrum 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 spectrum of solution or material; And the absorption spectrum 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 the process flow diagram of the absorption spectrum measuring method of elimination environment interference of stray light provided by the invention.
The list of parts of each label representative is following in the accompanying drawing:
1: light source 2: chopper
3: slit 4: planchet
7: 8: the second optical fiber of computing machine
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
Interference for fear of the environment parasitic light; The expanding application scope is measured the absorption spectrum of solution or material quickly, accurately, and the embodiment of the invention provides a kind of absorption spectrum measuring method of eliminating the environment interference of stray light; Referring to Fig. 1, Fig. 2 and Fig. 3, see hereinafter for details 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;
Wherein, the value of first predeterminated frequency is set according to the needs in the practical application, and when specifically realizing, the embodiment of the invention does not limit this.
102: the illumination after the modulation is mapped on the planchet 4, obtains the light beam through planchet 4;
103: light beam gets into first optical fiber 5 and reaches spectrometer 6;
104: spectrometer 6 carries out continuous sampling with second predeterminated frequency to light beam under the control of computing machine 7, obtains the absorption spectrum sequence S on testee surface
i
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 when specifically realizing, the embodiment of the invention does not limit this.Wherein the value of i is a positive integer.
105: in computing machine 7, according to time sequencing with absorption spectrum sequence S
iIn the corresponding data of same wavelength
Sort, obtain the light intensity sequence of each wavelength;
106: in computing machine 7; Light intensity sequence to each wavelength is carried out Fourier transform, obtains maximum harmonic component
Wherein, Maximum harmonic component
is specially: the identical harmonic component that most wavelength amplitudes are maximum, the value of j is a positive integer.
107: in computing machine 7; According to each wavelength order maximum harmonic component
is sorted, obtain absorption spectrum.
Promptly got access to the absorption spectrum of getting rid of the environment interference of stray light through above-mentioned steps 101-step 107.
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 through slit 3, obtains the light beam through planchet 4; Or,
Light after the modulation shines on the planchet 4 through second optical fiber 8, obtains the light beam through planchet 4.
Wherein, second optical fiber 8 is specially: light-conductive optic fibre.
The feasibility of the absorption spectrum measuring method of elimination environment interference of stray light provided by the invention is described with two concrete embodiment below, is seen for details hereinafter and describe:
Embodiment 1: as shown in Figure 1; The light beam that light source 1 sends is through chopper 2, and the light of being exported is modulated according to first predeterminated frequency, and the light after the modulation shines on the planchet 4 through slit 3; Obtain the light beam that sees through planchet 4; Light beam gets into first optical fiber 5 again and reaches spectrometer 6, under the control of computing machine 7, to be higher than the first predeterminated frequency n, second predeterminated frequency doubly light beam is carried out continuous sampling, obtains the absorption spectrum sequence S on testee surface
i, according to time sequencing, in computing machine 7 with absorption spectrum sequence S
iIn the corresponding data of same wavelength
Sort, obtain the light intensity sequence of each wavelength, the light intensity sequence of each wavelength is carried out Fourier transform obtain its maximum harmonic component
According to each wavelength order with maximum harmonic component
Sort, obtain the absorption spectrum on testee surface, this absorption spectrum has been got rid of the interference of environment parasitic light.
Embodiment 2: as shown in Figure 2; The light beam that light source 1 sends is through chopper 2, and the light of being exported is modulated according to first predeterminated frequency, and the light after the modulation shines on the planchet 4 through second optical fiber 8; Obtain the light beam that sees through planchet 4; Light beam gets into first optical fiber 5 again and reaches spectrometer 6, under the control of computing machine 7, to be higher than the first predeterminated frequency n, second predeterminated frequency doubly light beam is carried out continuous sampling, obtains the absorption spectrum sequence S on testee surface
i, according to time sequencing, in computing machine 7 with absorption spectrum sequence S
iIn the corresponding data of same wavelength
Sort, obtain the light intensity sequence of each wavelength, the light intensity sequence of each wavelength is carried out Fourier transform obtain its maximum harmonic component
According to each wavelength order with maximum harmonic component
Sort, obtain the absorption spectrum on testee surface, this absorption spectrum has been got rid of the interference of environment parasitic light.
In sum; The embodiment of the invention provides a kind of absorption spectrum measuring method of eliminating the environment interference of stray light; This method has got access to the absorption spectrum of getting rid of the environment interference of stray light; Avoid the interference of environment parasitic light, enlarged range of application, realized measuring quickly, accurately the absorption spectrum of solution or material; And the absorption spectrum 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 is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. an absorption spectrum 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 said modulation is mapped on the planchet, obtains the light beam that sees through said planchet;
(3) said light beam gets into first optical fiber and reaches spectrometer;
(4) said spectrometer carries out continuous sampling with second predeterminated frequency to said 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;
(5) in said computing machine, according to time sequencing with said absorption spectrum sequence S
iIn the corresponding data of same wavelength
Sort, obtain the light intensity sequence of each wavelength;
(6) in said computing machine; Light intensity sequence to said each wavelength is carried out Fourier transform; Obtain maximum harmonic component
wherein, the value of j is a positive integer;
(7) in said computing machine; According to each wavelength order said maximum harmonic component
is sorted, obtain absorption spectrum;
Wherein, said second predeterminated frequency is specially: be higher than the said first predeterminated frequency n doubly, wherein, the value of n is the positive integer greater than 2.
2. the absorption spectrum measuring method of elimination environment interference of stray light according to claim 1 is characterized in that, the illumination after the said modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through said planchet, is specially:
Light after the said modulation shines on the said planchet through slit, obtains the light beam that sees through said planchet.
3. the absorption spectrum measuring method of elimination environment interference of stray light according to claim 1 is characterized in that, the illumination after the said modulation in the step (2) is mapped on the planchet, obtains the light beam that sees through said planchet, is specially:
Light after the said modulation is fiber-optic illuminated to said planchet through second, obtains the light beam that sees through said planchet.
4. the absorption spectrum measuring method of elimination environment interference of stray light according to claim 3 is characterized in that, said second optical fiber is specially: light-conductive optic fibre.
5. the absorption spectrum measuring method of elimination environment interference of stray light according to claim 1; It is characterized in that said maximum harmonic component
is specially: the identical harmonic component that most wavelength amplitudes are maximum.
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| CN2010106195791A CN102033048B (en) | 2010-12-31 | 2010-12-31 | Measuring method of absorption spectrum for eliminating ambient stray light interference |
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| CN2010106195791A CN102033048B (en) | 2010-12-31 | 2010-12-31 | Measuring method of absorption spectrum for eliminating ambient stray light interference |
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| CN102033049B (en) * | 2010-12-31 | 2012-04-18 | 天津大学 | Method for measuring absorption hyper-spectrum chart by eliminating environmental stray light interference |
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| CN107290317A (en) * | 2017-07-02 | 2017-10-24 | 广东技术师范学院 | The method that double optical path modulation fluorescence excitation light sources measure packed complicated solution composition |
| CN107421925A (en) * | 2017-07-02 | 2017-12-01 | 天津大学 | Multiposition modulation transmission and the method for fluorescence excitation light source measurement free hemoglobin |
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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 |
| CN111829971A (en) * | 2020-08-10 | 2020-10-27 | 广州标旗光电科技发展股份有限公司 | Method for reducing measurement error of wide spectrum transmittance |
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| JP3311497B2 (en) * | 1994-06-29 | 2002-08-05 | 日本電子株式会社 | Fourier transform spectral phase modulation ellipsometry |
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