CN115078283A - Integrated ultraviolet spectroscopy and system - Google Patents
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- CN115078283A CN115078283A CN202210680231.6A CN202210680231A CN115078283A CN 115078283 A CN115078283 A CN 115078283A CN 202210680231 A CN202210680231 A CN 202210680231A CN 115078283 A CN115078283 A CN 115078283A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention discloses an integrated ultraviolet spectroscopy spectrometer and a system, comprising: the device comprises a light source (1), a light source collimating mirror (2), a first beam splitter (3), a reference cell (4), a first plane reflector (5), a second plane reflector (6), a sample cell (7), a second beam splitter (8), a slit front focusing mirror (9), a slit (10), a spectrometer collimating mirror (11), a grating (12), a spectrometer focusing mirror (13) and a CCD camera (14). The invention has the characteristics of small volume, convenient carrying and maintenance, high resolution, convenient test and capability of detecting the spectral range of 200-400nm and measuring without adding other parts; particularly, the invention realizes the simultaneous detection of reference light and absorbed light by using the optical design skill and the advantages of an area array CCD camera, and has short test time and high test efficiency.
Description
Technical Field
The invention relates to the technical field of optical analysis instruments, in particular to an integrated ultraviolet spectroscopy spectrometer and system.
Background
As an important content in water environment monitoring work, water quality monitoring can accurately, timely and comprehensively reflect the current situation of water quality, evaluate the development trend of the water quality and lay a foundation for the subsequent water pollution control work. Water quality monitoring requires the measurement of various water quality monitoring indexes. Taking nitrate as an example, nitrate is one of indexes for water quality monitoring, and the eutrophication of water body can be caused by the over-high concentration of nitrate, and more importantly, the nitrate with low toxicity can be reduced into nitrite with high toxicity after entering into human body, thereby causing potential threats to human health, such as methyl hemoglobinemia (MetHb), gastric cancer, parkinson disease and the like. Therefore, the method has important significance for realizing accurate qualitative and quantitative analysis of the nitrate/water quality monitoring index.
At present, most of the water quality monitoring indexes are measured by field sampling laboratory analysis methods, various chemical methods are mainly used for measurement, and the problems of high reagent toxicity, long measurement time, discontinuity of monitoring time, easy deterioration of water samples and the like exist although the methods have high sensitivity. The method for determining part of indexes can be based on an ultraviolet-visible spectrophotometry, and the method for representing the water quality through the ultraviolet-visible absorption spectrum has the advantages of simplicity, directness, high determination speed, environmental protection, no pollution, no need of chemical reagents and the like.
However, the traditional ultraviolet visible spectrum such as Shanghai cyanine 756PC, Shimadzu UV-1780, Shanghai chromatography UV-9000 and the like is limited in many occasions due to the reasons of large volume, complex operation, need of alternating current power supply, inconvenience in carrying and the like. There are some commercially available ultraviolet spectrometers in the world, such as usb400, U.S. B & W Tek spectrometer, avitius Mini4096CL, etc., which are manufactured by ocean optics corporation, and the optical fiber, sample cell and light source are separated, and the optical fiber, sample cell and light source need to be assembled and tested on site during use, and the procedure is complicated and the testing time is long. Similar patents exist: CN 203191307U-portable ultraviolet visible spectrometer all-in-one machine adopts the form of integrating sphere to collect light, the integrating sphere needs to be customized and is expensive, the instrument needs two ultraviolet visible spectrometer all-in-one machines for measuring liquid absorption spectrum, one machine is used as a radiation source, the other machine is used as a spectrometer, a group of universal quartz cuvettes are also needed, the measurement of absorbance needs to measure a reference spectrum firstly and then a transmission spectrum, the detection time is long, and the detection efficiency is low. At present, a small integrated ultraviolet spectrometer capable of rapidly detecting is not available.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an integrated ultraviolet spectrometer and an integrated ultraviolet spectrometer system, which are used for solving the problems of part integration, more measurement times, long measurement time and contradiction between large instrument size and resolution of the existing small ultraviolet spectrometer.
The invention adopts the following technical scheme:
in one aspect, an integrated uv spectrometer comprises: the device comprises a light source, a light source collimating mirror, a first beam splitter, a reference cell, a first plane reflector, a second plane reflector, a sample cell, a second beam splitter, a slit front focusing mirror, a slit, a spectrometer collimating mirror, a grating, a spectrometer focusing mirror and a CCD camera;
divergent light is emitted from a light source (1), becomes parallel light after passing through a light source collimating mirror (2), the parallel light enters a first beam splitter (3) and then is split, wherein one beam of light enters a sample cell (7) after being reflected by a second plane reflector (6) to become absorbed light, and the absorbed light enters a slit front focusing mirror (9) after being transmitted by a second beam splitter (8) and is focused at the center of a slit (10); the other beam of light enters a reference cell (4) to become reference light, the reference light is reflected by a first plane reflector (5) to enter a second beam splitter (8), the reference light and the absorption light are combined after passing through the second beam splitter (8), and are focused to different positions of a slit through a slit front focusing mirror (9), the two beams of light simultaneously enter a spectrometer collimator (11) to become two beams of parallel light and then enter a grating (12) for splitting, the two beams of parallel light enter a spectrometer focusing mirror (13) to be focused to different positions of a CCD camera (14), and a silicon detector in the CCD camera (14) respectively converts the two beams of light signals into two electrical signals and sends the two electrical signals to a terminal device to display an absorption spectrum and a reference spectrum.
Preferably, the light source is a fiber light source, and the wavelength range is 200-1100 nm. Preferably, the light source can output focusing light or collimated light after passing through the optical fiber; when the light source outputs collimated light beams after passing through the optical fiber, the collimated light beams can directly enter the first beam splitter and then are split.
Preferably, the first beam splitter and the second beam splitter are 1:1 beam splitters, and the wavelength range is 200 and 400 nm; the first beam splitter rotates 45 degrees around the direction vertical to the optical axis for splitting; the second beam splitter rotates by 1-3 degrees around the direction of the optical axis on the basis of rotating by 45 degrees around the direction vertical to the optical axis so as to separate reference light and absorbed light, so that the reference light and the absorbed light can be simultaneously detected by the same area array CCD camera, and the distance between the reference light and the absorbed light focused on the slit (10) is 0.5-2 mm.
Preferably, the slit has a width of 50 μm and a length of 3mm, and the reference light and the absorption light are focused on the slit at a distance of 0.5 to 2 mm.
Preferably, the grating is a blazed reflection grating, and light with different wavelengths can be scattered to different directions.
Preferably, the CCD camera is an area array CCD camera, can convert received photons into electrons, and can realize spectrum display by setting regional imaging and simultaneously reading two pieces of spectrum information and connecting the two pieces of spectrum information with terminal equipment and software;
on the other hand, an integrated ultraviolet spectroscopy system comprises the integrated ultraviolet spectroscopy and further comprises: a terminal device; the terminal equipment is connected with the CCD camera to receive the electric signals and perform spectrum display.
Preferably, the terminal device reads and displays the reference light and the absorbed light in different areas.
Preferably, the terminal device includes a terminal device with a calculation and display function integrated on the integrated ultraviolet spectrometer, or the terminal device includes an external terminal device with a display and calculation function.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention integrates a small light source, a sample cell and a reference cell, and solves the problem of integration of parts of a small spectrometer;
(2) the reference light and the absorbed light of the invention generate a certain angle after passing through the second beam splitter, the reference light enters the front focusing mirror of the slit and then focuses on the length direction of the slit, and at the moment, the reference light and the absorbed light have a certain distance in the length direction of the slit, so that the simultaneous acquisition of the reference light and the absorbed light is realized by adopting an area array CCD camera, and the problems of more measurement times and long measurement time are solved; in the existing small spectrometer, the collection needs two times, the reference light is collected for the first time, the absorbed light is collected for the second time, and then the absorbance can be calculated, so that the inconsistency of time exists, and a sample can be polluted in the process;
(3) the invention solves the problem of contradiction between large size and resolution of the instrument, and adopts a mode of combining a symmetrical light path and a ct-type light path; the ct-type light path has high utilization rate of the size and small size, the symmetrical light path has the same light loss to different wavelengths, the response to the wavelengths is enhanced, the reference light and the absorbed light can be easily separated by the second beam splitter of the rotational symmetrical light path, and the two light spots can be easily separated by a small rotation angle (1-3 degrees) so as to ensure the resolution.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic view of the invention for light splitting perpendicular to a slit;
FIG. 2 is a non-spectroscopic illustration of the parallel to slit aspect of the present invention;
FIG. 3 is a schematic view of a slit of the present invention;
FIG. 4 is a zemax nonsequential mode overall optical path schematic of the present invention;
FIG. 5 is a zemax series mode reference beam path and full field of view spot diagram of the present invention;
FIG. 6 is a zemax series mode absorption optical path and full field of view spot diagram of the present invention;
wherein, 1, a light source; 2. a light source collimating mirror; 3. a first beam splitter; 4. a reference cell; 5. a first planar mirror; 6. a second planar mirror; 7. a sample cell; 8. a second beam splitter; 9. a slit front focusing mirror; 10. a slit; 11. a spectrometer collimating mirror; 12. a grating; 13. a spectrometer focusing mirror; 14. a CCD camera.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "placed," "contacted," and the like are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally attached; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The integrated ultraviolet spectrometer and system, a microscope equipped with the integrated ultraviolet spectrometer and system, and an image pickup apparatus equipped with the integrated ultraviolet spectrometer and system according to the present invention will be described below with reference to the drawings of the specification.
Referring to fig. 1 and 2, an integrated uv spectrometer of the present invention comprises: the spectrometer comprises a light source 1, a light source collimating mirror 2, a first beam splitter 3, a reference cell 4, a first plane reflector 5, a second plane reflector 6, a sample cell 7, a second beam splitter 8, a slit front focusing mirror 9, a slit 10, a spectrometer collimating mirror 11, a grating 12, a spectrometer focusing mirror 13 and a CCD camera 14.
The divergent ultraviolet light is emitted from an ultraviolet light source 1, becomes parallel light after passing through a light source collimating mirror 2, the parallel light enters a first beam splitter 3 for splitting, wherein one beam of light enters a sample cell 7 after being reflected by a second plane reflector 6 to become absorbed light, the absorbed light enters a slit front focusing mirror 9 after being transmitted by a second beam splitter 8 and is focused at the center of a slit 10, the other beam of light enters a reference cell 4 to become reference light, the reference light enters a second beam splitter 8 after being reflected by a first plane reflector 5, the second beam splitter 8 rotates around an optical axis by a small angle (1-3 degrees around the optical axis, which is set at the beginning of installation and is not needed to rotate at the end), the reference light and the absorbed light can generate a certain angle, the reference light enters the slit front focusing mirror 9 and is focused in the length direction of the slit 10 (the slit 10 is 50 micrometers and the width is 3mm), the reference light is now at a distance from the absorbed light in the length direction of the slit 10, which is due to the fact that the second beam splitter 8 is rotated a small angle around the optical axis and thus at an angle. The absorption light and the reference light enter the spectrometer collimating mirror 11 at the same time and then are changed into parallel light, and then enter the grating 12 for light splitting, the parallel light enters the spectrometer focusing mirror 13 after the light splitting is finished and is focused on the CCD camera 14, and the silicon detector in the CCD camera 14 converts the optical signal into an electric signal and sends the electric signal to the terminal equipment for spectrum display.
Referring to fig. 3, the slit 10 is divided into two directions, a width direction for separating light of different wavelengths and a length direction for aligning the reference light and the absorbed light. As shown in fig. 1, the width direction of the slit 10 is the same as the spreading direction of the grating spectrum, so as to separate the light with different wavelengths, as shown in fig. 2, the reference light and the absorbed light are arranged in the direction of the length of the slit 10, and the reference light and the absorbed light are imaged on the CCD camera 14, and then converted into electrical signals by the silicon detector, and the electrical signals are read and displayed by the computing software in different areas.
The method is based on Lambert beer's law, the reference light absorbs light in proportion, then negative base-ten logarithm is removed, the sample is put in a sample pool to test the absorption light, and blank reference light is put in the reference pool to test the reference light, the blank reference light is the same solvent without financing, namely, other samples are the same as the samples put in the sample pool, and only the samples are not put in the blank reference light.
In this embodiment, the light source 1 is a fiber light source with a wavelength range of 200 and 1100 nm.
The light source 1 outputs focused light or collimated light beam; when the light source 1 outputs collimated light beams, the collimated light beams directly enter the first beam splitter 3 and then are split.
The first beam splitter 3 and the second beam splitter 8 are 1:1 beam splitters, and the wavelength range is 200-400 nm;
the first beam splitter 3 rotates 45 degrees around the direction vertical to the optical axis for splitting; the second beam splitter 8 rotates by 1 ° to 3 ° about the direction of the optical axis again on the basis of rotating by 45 ° about the direction perpendicular to the optical axis to separate the reference light and the absorption light. The width of the slit 10 is 50 μm, the length is 3mm, and the distance of the reference light and the absorbed light focused on the slit 10 is 0.5-2 mm.
The grating 12 is a blazed reflective grating capable of scattering light with different wavelengths in different directions
The CCD camera 14 is an area array CCD camera, can convert received photons into electrons, and can realize spectrum display by being connected with terminal equipment and software.
Further, see fig. 4, which is a schematic view of zemax nonsequential mode overall optical path of the present invention. As can be seen from the figure, the overall diagram of the simulation system can track the reference light and the absorbed light, and shows the consistency of the simulation and the pre-theoretical light path design.
Referring to FIG. 5, there is shown a zemax series mode reference beam path and a full field of view spot diagram of the present invention. It can be seen from the figure that the point-sequence chart shows that the resolution of the central wavelength is about 0.5nm and the resolution of the edge wavelength is about 1nm after the simulation and optimization of the optical simulation software zemax sequence mode of the reference light path.
Referring to FIG. 6, there is shown a zemax series mode absorption optical path and a full field of view spot diagram of the present invention. As can be seen from the figure, the resolution of the central wavelength is about 0.2nm and the resolution of the edge wavelength is about 0.5nm, which are shown by a point-sequence diagram after simulation and optimization of the absorption optical path in a zemax sequence mode of optical simulation software.
The two light path diagrams in the sequence mode are used for optimizing light path parameters and displaying a final result. If the visible light and near infrared wavelength range (400-1100nm) needs to be measured, the target surface of the CCD camera needs to be enlarged, the fractional range of the beam splitter is changed into the visible light and near infrared wavelength range, and the broadband range measurement of the ultraviolet band, the visible light wavelength and the near infrared range can be realized by changing the grating ruling number.
This embodiment of an integral type ultraviolet spectroscopy system, include integral type ultraviolet spectroscopy appearance, still include: a terminal device; the terminal device is connected to the CCD camera 14 to receive the electrical signal and perform spectral display.
The terminal device reads and displays the mouth reference light and the absorbed light in different areas.
The terminal equipment comprises terminal equipment with a calculating and displaying function integrated on the integrated ultraviolet spectrometer, or the terminal equipment comprises external terminal equipment with a displaying and calculating function.
The invention relates to a small integrated ultraviolet spectrometer, which has the following priority:
(1) the volume is small (250mm multiplied by 100mm multiplied by 25mm), the carrying and the maintenance are convenient, the detectable spectrum range is 200-400nm, and the resolution is high (the spectrum resolution near the central wavelength can reach 0.2nm, and the spectrum resolution near the edge wavelength can reach 1 nm);
(2) the measurement can be carried out without adding other parts, and the test is convenient;
(3) the reference light and the absorbed light are completed at one time, the testing time is short, and the testing efficiency is high;
(4) the spectrometer with small size can be integrated into an unmanned ship or other places with the limit on the size of the spectrometer in the future, mainly used for measuring substances in ultraviolet bands, and subsequently used for detecting the substances in the ultraviolet bands in the seawater in real time to represent the water quality condition of the seawater so as to prevent the pollution condition of the ocean in advance.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. An integrated ultraviolet spectroscopy spectrometer, comprising: the device comprises a light source (1), a light source collimating mirror (2), a first beam splitter (3), a reference cell (4), a first plane reflector (5), a second plane reflector (6), a sample cell (7), a second beam splitter (8), a slit front focusing mirror (9), a slit (10), a spectrometer collimating mirror (11), a grating (12), a spectrometer focusing mirror (13) and a CCD camera (14);
divergent light is emitted from a light source (1), becomes parallel light after passing through a light source collimating mirror (2), the parallel light enters a first beam splitter (3) and then is split, wherein one beam of light enters a sample cell (7) after being reflected by a second plane reflector (6) to become absorbed light, and the absorbed light enters a slit front focusing mirror (9) after being transmitted by a second beam splitter (8) and is focused at the center of a slit (10); the other beam of light enters a reference cell (4) to become reference light, the reference light is reflected by a first plane reflector (5) to enter a second beam splitter (8), the reference light and the absorption light are combined after passing through the second beam splitter (8), and are focused to different positions of a slit through a slit front focusing mirror (9), the two beams of light simultaneously enter a spectrometer collimator (11) to become two beams of parallel light and then enter a grating (12) for splitting, the two beams of parallel light enter a spectrometer focusing mirror (13) to be focused to different positions of a CCD camera (14), and a silicon detector in the CCD camera (14) respectively converts the two beams of light signals into two electrical signals and sends the two electrical signals to a terminal device to display an absorption spectrum and a reference spectrum.
2. The integrated UV spectrometer according to claim 1, wherein the light source (1) is a fiber optic light source with a wavelength range of 200 and 1100 nm.
3. The integrated ultraviolet spectrometer according to claim 2, wherein the light source (1) can output focusing light or collimated light after passing through an optical fiber; the light source (1) outputs divergent light after passing through the optical fiber, and then directly enters the first beam splitter (3) for light splitting when outputting collimated light beams through the light source.
4. The integrated ultraviolet spectroscopy spectrometer according to claim 1, wherein the first beam splitter (3) and the second beam splitter (8) are 1:1 beam splitters with wavelength ranges of 200-400 nm; the first beam splitter (3) rotates for 45 degrees around the direction vertical to the optical axis for splitting; the second beam splitter (8) is rotated by 1 DEG to 3 DEG in the direction of the optical axis on the basis of being rotated by 45 DEG in the direction perpendicular to the optical axis to separate the reference light and the absorption light.
5. The integrated uv spectrometer according to claim 1, wherein the slit (10) has a width of 50 μm and a length of 3mm, and the reference light and the absorption light are focused on the slit (10) at a distance of 0.5-2 mm.
6. The integrated uv spectrometer according to claim 1, characterized in that the grating (12) is a blazed reflection grating; light of different wavelengths can be scattered in different directions.
7. The integrated ultraviolet spectroscopy spectrometer according to claim 1, wherein the CCD camera (14) is an area array CCD camera, which can convert received photons into electrons, and by setting up the area division imaging, and reading two pieces of spectral information at the same time, the integrated ultraviolet spectroscopy spectrometer can be connected to a terminal device and software to realize spectral display.
8. An integrated uv spectroscopy system comprising the integrated uv spectrometer of any one of claims 1 to 7, further comprising: a terminal device; the terminal equipment is connected with a CCD camera (14) to receive the electric signals and perform spectrum display.
9. The integrated uv spectroscopy system of claim 8, wherein the terminal device reads and displays the mouth reference light and the absorption light in different regions.
10. The integrated uv spectroscopy system of claim 8, wherein the terminal device comprises a terminal device with computing and displaying functions integrated on the integrated uv spectrometer, or the terminal device comprises an external terminal device with displaying and computing functions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210680231.6A CN115078283A (en) | 2022-06-16 | 2022-06-16 | Integrated ultraviolet spectroscopy and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210680231.6A CN115078283A (en) | 2022-06-16 | 2022-06-16 | Integrated ultraviolet spectroscopy and system |
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| CN115078283A true CN115078283A (en) | 2022-09-20 |
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