CN101413825B - Method and apparatus for measuring stray light ratio in spectrometer - Google Patents
Method and apparatus for measuring stray light ratio in spectrometer Download PDFInfo
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- CN101413825B CN101413825B CN2008101625086A CN200810162508A CN101413825B CN 101413825 B CN101413825 B CN 101413825B CN 2008101625086 A CN2008101625086 A CN 2008101625086A CN 200810162508 A CN200810162508 A CN 200810162508A CN 101413825 B CN101413825 B CN 101413825B
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Abstract
The invention discloses a method for measuring ratio of stray light in a spectrometer. The method specifically comprises the following steps: a. a light source and a measured spectrometer are connected by a specific optical fiber and a transmissive optical fiber so that a specific spectrum and a transmission spectrum are obtained respectively; the light source is matched with a service wave band of the measured spectrometer, the specific optical fiber is opaque to the light with a specific wavelength, and the transmissive optical fiber is transparent to the light with the specific wavelength which is in the service wave band; and b. the specific spectrum and the transmission spectrum are compared to obtain the ratio of the stray light of the measured spectrometer at the specific wavelength. The invention also discloses a device for performing the method. The method and the device have the advantages of reasonable design, effective and fast measurement of the stray light ratio, no toxin and no pollution, a plurality of measurable wave bands, stability and convenience, and can be widely applied to detecting the performances of spectrometers.
Description
Technical field
The present invention relates to a kind of detection method and device of spectrometer, particularly a kind of method and device of measuring stray light ratio in the spectrometer.
Background technology
During test light spectrometer stray light ratio, select some at the opaque solution of test waves strong point, light is passed solution, light intensity under this test wavelength of test on the detected light spectrometer, be the parasitic light light intensity of this spectrometer under the test wavelength, the light intensity that the parasitic light light intensity obtains when not passing solution is compared, obtain stray light ratio.
---appraisal procedure that " JJG 689-1990 ultraviolet, visible, near infrared spectrometer " and American National material test association provide---ASTM E 387 " Standard Test Method for Estimating Stray Radiant Power Ratio of DispersiveSpectrophotometers by the Opaque Filter Method " according to People's Republic of China's national metrological verification regulations, for ultraviolet (UV) wave band, when testing the stray light ratio at 220nm place, select the sodium iodide solution of the 10g/L of 1cm light path; When testing the stray light ratio at 340nm place, adopt the sodium nitrite solution of the 50g/L of 1cm light path.When visible light (VIS) wave band, the stray light ratio at test 620nm place, 0.005% methylene blue solution of employing 1cm light path.Near infrared (NIR) wave band when testing the stray light ratio at 1690nm place, adopts the methylene bromide (CH of 5cm light path
2Br
2) solution.
Said method has following deficiency:
1, obtain solution at first needs to weigh, and then obtain solution, and operating personnel's individual difference can cause concentration to exist than large deviation, and error at measurment is big.
2, assay method harmfulness is big, and mostly these solution of employing are volatile, poisonous material, is a kind of carcinogen as sodium nitrite, and methylene bromide is volatile noxious material.The recovery of these solution also is a difficult problem, general direct discharging, contaminated environment.
3, it is few to measure wavelength, and a kind of solution generally can only be tested a wavelength, can only be used for the mensuration of 1690nm place parasitic light as methylene bromide.
4, the mensuration process is loaded down with trivial details, and obtain solution needs the regular hour.Solution is not easy long preservation, and each mensuration generally will be prepared again.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, it is little to the invention provides a kind of measuring error, and measuring speed is fast, nontoxic, pollution-free, and it is many to measure wave band, the stable method of measuring stray light ratio in the spectrometer easily; Also provide a kind of simple and reasonable, measuring error is little, and measuring speed is fast, and is nontoxic, pollution-free, and it is many to measure wave band, the stable device of measuring stray light ratio in the spectrometer easily.
It is a kind of method of measuring stray light ratio in the spectrometer that the present invention solves the problems of the technologies described above the technical scheme that is adopted, and may further comprise the steps:
A, use particular fiber and see through optical fiber and is connected light source and tested spectrometer, thereby obtain special spectrum respectively and through spectrum;
The service band of described light source and the service band of tested spectrometer are complementary;
Described particular fiber is opaque to the light of specific wavelength, the described optical transparency that sees through optical fiber to described specific wavelength, and described specific wavelength is in the service band of described tested spectrometer;
B, more described special spectrum and see through spectrum obtain the stray light ratio of tested spectrometer in described certain wave strong point.
Step a of the present invention is: use particular fiber, be connected light source and tested spectrometer with photoswitch through optical fiber, by the selection of described photoswitch, thereby obtain special spectrum respectively and see through spectrum;
The service band of described light source and the service band of tested spectrometer are complementary;
Described particular fiber is opaque to the light of specific wavelength, the described optical transparency that sees through optical fiber to described specific wavelength, and described specific wavelength is in the service band of described tested spectrometer.
The material that contains the light that absorbs described specific wavelength in the particular fiber of the present invention.
Material of the present invention contains hydroxyl.
Specific wavelength of the present invention is at least one among 1390nm, the 2200nm.
The invention allows for a kind of like this device of measuring stray light ratio in the spectrometer, comprise particular fiber, see through optical fiber, light source, the service band of light source and the service band of tested spectrometer are complementary;
Described particular fiber is opaque to the light of specific wavelength, the described optical transparency that sees through optical fiber to described specific wavelength, and described specific wavelength is in the service band of described tested spectrometer.
Device of the present invention also comprises and described particular fiber and the photoswitch that is connected through optical fiber.
The opaque transmitance of light in described particular fiber of described specific wavelength that be meant of the present invention is less than 0.001%.
The present invention compared with prior art has following beneficial effect:
1, the present invention adopts the light to specific wavelength to have the strong particular fiber that absorbs, and particular fiber is opaque in the certain wave strong point, thereby realizes the fast measuring to the specific wavelength stray light ratio.
Optical fiber connects spectrometer can be tested, and optical properties is stable, can not produce deviation because of operating personnel's artificial origin, and error at measurment is little, and reproducibility is good.
2, the nontoxic nothing volatilization of device can not cause personal injury and environmental pollution.
3, the stray light ratio that can once finish a plurality of wave bands is measured, and has improved work efficiency.
4, convenient to use, need not obtain solution and use annex such as cuvette, storage and convenient transportation, processing mode is identical with ordinary optic fibre.
Description of drawings
Fig. 1 is the structural representation of device among the embodiment 1;
Fig. 2 is another structural representation of device among the embodiment 1;
Fig. 3 is the structural representation of device among the embodiment 2;
Fig. 4 is the specific light spectrogram among the embodiment;
Fig. 5 is the spectrogram that sees through among the embodiment.
Embodiment
Following examples have been done further instruction to situations such as method of the present invention, step, instrument and application, are the reasonable application forms of the present invention, but scope of the present invention is not confined to following embodiment.
Embodiment 1:
As shown in Figure 1, 2, a kind of device of measuring stray light ratio in the spectrometer comprises tungsten lamp 1, the particular fiber 3 that can be connected with tungsten lamp 1 and sees through optical fiber 4.
Tested spectrometer 2 is that (Focused Photonics, Inc.), the service band of this tested spectrometer 2 is 1000-2500nm to SWIR-100.The operating wavelength range of tungsten lamp 1 is 400-3000nm, thereby is complementary with the service band of described tested spectrometer 2.
Described particular fiber 3 is made of the quartz that contains the high concentration hydroxyl, and the concentration of described hydroxyl is 1000ppm, and the length of particular fiber 3 is 5m, has guaranteed to specific wavelength to be the absorption fully of the light of 1390nm, 2200nm; Seeing through optical fiber 4 and constitute (be subjected to technogenic influence, may contain the hydroxyl of low concentration) by quartz, is fine the seeing through of light of 1390nm, 2200nm thereby make specific wavelength.
Present embodiment has also disclosed a kind of method of measuring stray light ratio in the spectrometer, also is the application process of said apparatus, may further comprise the steps:
A, as shown in Figure 1 connects tungsten lamp 1 and tested spectrometers 2 with described particular fiber 3, and the light that tungsten lamp 1 sends enters described tested spectrometer 2 through particular fiber 3, thereby obtains special spectrum as shown in Figure 4.As can be seen, very weak in the light intensity at specific wavelength 1390nm, 2200nm place, because the light of specific wavelength all absorbs by particular fiber 3, so the tested just spectrometer 2 of the light intensity that obtains is in the parasitic light light intensity of described certain wave strong point;
As shown in Figure 2, connect tungsten lamp 1 and tested spectrometer 2 with seeing through optical fiber 4, the light that tungsten lamp 1 sends enters described tested spectrometer 2 through seeing through optical fiber 4, thereby obtains the spectrum that sees through as shown in Figure 5.As can be seen, very high in the light intensity at specific wavelength 1390nm, 2200nm place, and this just tungsten lamp 1 in the light intensity of described certain wave strong point;
B, more described special spectrum and see through spectrum, thus the stray light ratio of described tested spectrometer obtained at described specific wavelength 1390nm, 2200nm place.
Embodiment 2:
As shown in Figure 3, a kind of device of measuring stray light ratio in the spectrometer, this device comprise tungsten lamp 1, particular fiber 3, see through optical fiber 4 and photoswitch 5.
Present embodiment has also disclosed a kind of method of measuring stray light ratio in the spectrometer, also is the application process of said apparatus, may further comprise the steps:
A, as shown in Figure 3, tungsten lamp 1 passes through particular fiber 3, is connected tested spectrometer 2 with photoswitch 5 through optical fiber 4, by described photoswitch 2, the light that tungsten lamp 1 is sent optionally enters tested spectrometer 2 by particular fiber 3 with through optical fiber 4 respectively, thereby obtains the special spectrum shown in Fig. 4,5 respectively and see through spectrum;
B, more described special spectrum and see through spectrum, thus the stray light ratio of described tested spectrometer 2 obtained at described specific wavelength 1390nm, 2200nm place.
In the foregoing description 1,2, drawing the stray light ratio of tested spectrometer 2 at specific wavelength 1390nm place is 0.035%, and the stray light ratio at specific wavelength 2200nm place is 0.026%, the excellent properties of visible above-mentioned tested spectrometer 2.
About other explanation of the present invention:
1, specific wavelength is not limited to two wavelength among the embodiment, and is concrete relevant with the service band of tested spectrometer, can also be the wavelength of ultraviolet band, the wavelength of visible waveband, other wavelength of infrared band.
2, as long as include the material of the light that absorbs above-mentioned specific wavelength in the optical fiber, thereby make the particular fiber that is complementary with specific wavelength, just can realize the parasitic light of this certain wave strong point is measured.
Above-mentioned embodiment should not be construed as limiting the scope of the invention.Key of the present invention is: after the light of specific wavelength is absorbed with particular fiber, measure the light intensity of the light of specific wavelength in the spectrometer, thereby realize the fast measuring to spectrometer specific wavelength stray light ratio.Under the situation that does not break away from spirit of the present invention, any type of change that the present invention is made all should fall within protection scope of the present invention.
Claims (10)
1. method of measuring stray light ratio in the spectrometer may further comprise the steps:
A, use particular fiber and see through optical fiber and is connected light source and tested spectrometer, thereby obtain special spectrum respectively and through spectrum;
The service band of described light source and the service band of tested spectrometer are complementary;
Described particular fiber is opaque to the light of specific wavelength, the described optical transparency that sees through optical fiber to described specific wavelength, and described specific wavelength is in the service band of described tested spectrometer;
B, more described special spectrum and see through spectrum obtain the stray light ratio of tested spectrometer in described certain wave strong point.
2. the method for stray light ratio in the mensuration spectrometer according to claim 1, it is characterized in that: described step a is:
Use particular fiber, be connected light source and tested spectrometer with photoswitch,, thereby obtain special spectrum respectively and see through spectrum by the selection of described photoswitch through optical fiber;
The service band of described light source and the service band of tested spectrometer are complementary;
Described particular fiber is opaque to the light of specific wavelength, the described optical transparency that sees through optical fiber to described specific wavelength, and described specific wavelength is in the service band of described tested spectrometer.
3. the method for stray light ratio in the mensuration spectrometer according to claim 1 is characterized in that: the described opaque transmitance of light in described particular fiber of described specific wavelength that be meant is less than 0.001%.
4. according to the method for stray light ratio in claim 1 or the 2 or 3 described mensuration spectrometers, it is characterized in that: the material that contains the light that absorbs described specific wavelength in the described particular fiber.
5. the method for stray light ratio in the mensuration spectrometer according to claim 4, it is characterized in that: described material contains hydroxyl.
6. according to the method for stray light ratio in claim 1 or the 2 or 3 described mensuration spectrometers, it is characterized in that: described specific wavelength is at least one among 1390nm, the 2200nm.
7. a device of measuring stray light ratio in the spectrometer comprises particular fiber, sees through optical fiber, light source, and the service band of light source and the service band of tested spectrometer are complementary;
Described particular fiber is opaque to the light of specific wavelength, the described optical transparency that sees through optical fiber to described specific wavelength, and described specific wavelength is in the service band of described tested spectrometer.
8. the device of stray light ratio in the mensuration spectrometer according to claim 7 is characterized in that: described device also comprises and described particular fiber and the photoswitch that is connected through optical fiber.
9. according to the device of stray light ratio in claim 7 or the 8 described mensuration spectrometers, it is characterized in that: the described opaque transmitance of light in described particular fiber of described specific wavelength that be meant is less than 0.001%.
10. according to the device of stray light ratio in claim 7 or the 8 described mensuration spectrometers, it is characterized in that: the material that contains the light that absorbs described specific wavelength in the described particular fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101625086A CN101413825B (en) | 2008-11-19 | 2008-11-19 | Method and apparatus for measuring stray light ratio in spectrometer |
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| CN2008101625086A CN101413825B (en) | 2008-11-19 | 2008-11-19 | Method and apparatus for measuring stray light ratio in spectrometer |
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| CN101413825A CN101413825A (en) | 2009-04-22 |
| CN101413825B true CN101413825B (en) | 2010-08-11 |
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