CN112067598B - Low-noise space heterodyne spectrometer for short wave ultraviolet Raman spectrum detection - Google Patents
Low-noise space heterodyne spectrometer for short wave ultraviolet Raman spectrum detection Download PDFInfo
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- 238000001237 Raman spectrum Methods 0.000 title claims abstract description 27
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
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Abstract
A low-noise space heterodyne spectrometer for short wave ultraviolet Raman spectrum detection comprises a front objective lens, a Raman filter, a beam splitter with a diaphragm, a first collimating objective lens, a first reflection grating, a second collimating objective lens, a second reflection grating, a third collimating objective lens and an area array camera. The first collimating objective lens and the third collimating objective lens form a 4f system, and the second collimating objective lens and the third collimating objective lens form a 4f system; after the diffraction spectrum signals reflected by the first grating and the second grating pass through a beam splitter with a diaphragm, only spectrum signals with effective diffraction orders enter an area array camera; the low-noise space heterodyne spectrometer for short-wave ultraviolet Raman spectrum detection can effectively inhibit useless-level stray light of a grating, and improves the signal-to-noise ratio and the sensitivity of short-wave ultraviolet Raman spectrum detection.
Description
Technical Field
The invention relates to the field of optical imaging, in particular to a low-noise space heterodyne spectrometer for short-wave ultraviolet Raman spectrum detection.
Background
The Raman spectrum reflects the internal structure and state characteristics of the molecule, has a fingerprint effect, and is an important means for analyzing the structure of the organic compound. Has important application value in the fields of biomedicine, chemical analysis, pollutant monitoring and the like.
The space heterodyne Raman spectrometer has the advantages of high flux, wide field of view, compact structure and the like, and is an important Raman spectrum testing method developed in recent years. The short wave ultraviolet Raman spectrum has the advantages of high excitation efficiency, weak fluorescence signal, low background noise, resonance enhancement and the like, and is one of important development directions of Raman spectrum. However, when the short-wave ultraviolet spectrum (200 nm-300 nm) is detected, the wavelength is only 1/3-1/2 of that of visible near infrared light, so that the ineffective diffraction orders of the grating are multiplied, and the included angle between adjacent diffraction orders is reduced, thereby increasing stray light of the system, reducing the detection sensitivity of the system, and simultaneously, spectrum false peaks can appear to influence the accuracy of Raman spectrum detection.
Disclosure of Invention
The invention aims to provide a low-noise space heterodyne spectrometer for short-wave ultraviolet Raman spectrum detection, which is used for overcoming the problems existing in the prior art. By arranging the 4f system in the existing Michelson space heterodyne interference structure, invalid diffraction order stray light of the grating is effectively restrained, and sensitivity and accuracy of short wave ultraviolet Raman spectrum detection are improved.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the low-noise space heterodyne spectrometer for short-wave ultraviolet Raman spectrum detection comprises a front objective lens 1, a Raman filter 2, a beam splitter 3 with a diaphragm, a first collimating objective lens 4, a first reflection grating 5, a second collimating objective lens 6, a second reflection grating 7, a third collimating objective lens 8 and an area array camera 9 which are arranged along an optical path; wherein the geometric center of the beam splitter 3 with the diaphragm is positioned at the center of the image plane of the front objective lens and is also positioned at the front focus positions of the first collimating objective lens 4, the second collimating objective lens 6 and the third collimating objective lens 8; the geometric center of the first reflection grating 5 is positioned at the back focal position of the first collimating objective lens 4, the geometric center of the second reflection grating 7 is positioned at the back focal position of the second collimating objective lens 6, and the photosensitive surface of the area-array camera 9 is positioned at the back focal position of the third collimating objective lens 8.
As a preferred solution, the first collimator objective 4 and the second collimator objective 6 are the same lens.
As a preferred embodiment, the first reflection grating 5 and the second reflection grating 7 are the same grating.
As a preferable technical scheme, when the raman spectrum excitation light source is the same frequency laser incident system, the included angle between the incident light of the first reflection grating 5 and the normal line thereof is a Littrow angle, and the included angle between the incident light of the second reflection grating 7 and the normal line thereof is a Littrow angle.
As a preferable technical scheme, the beam splitter 3 with the diaphragm is composed of a beam splitter and front and rear surface diaphragms, and the adjustment of the light passing width of the beam splitter 3 with the diaphragm is realized by controlling the diaphragm size.
As a preferable technical scheme, the beam splitter consists of two pieces of ultraviolet quartz optical glass or two pieces of ultraviolet plastic glass.
As the preferable technical scheme, the joint of the two lenses is plated with a short wave ultraviolet semi-transparent semi-reflective film.
Compared with the prior art, the invention has the beneficial effects that:
the low-noise space heterodyne spectrometer for short-wave ultraviolet Raman spectrum detection can effectively inhibit invalid diffraction order stray light generated by a grating, and can improve the signal-to-noise ratio of short-wave ultraviolet Raman spectrum detection, thereby improving the sensitivity; meanwhile, the occurrence of a false peak is avoided, and the accuracy of short wave ultraviolet Raman spectrum detection is improved.
Drawings
FIG. 1 is a schematic diagram of a low noise spatial heterodyne spectrometer for short wave ultraviolet Raman spectroscopy according to the present invention.
FIG. 2 is a schematic diagram of a beam splitter with diaphragm in a low noise spatial heterodyne spectrometer for short wave ultraviolet Raman spectrum detection.
Detailed Description
Examples
As shown in fig. 1, the low-noise space heterodyne spectrometer for short-wave ultraviolet raman spectrum detection comprises a front objective lens (1), a raman filter (2), a beam splitter (3) with a diaphragm, a first collimating objective lens (4), a first reflection grating (5), a second collimating objective lens (6), a second reflection grating (7), a third collimating objective lens (8) and an area array camera (9), wherein the front objective lens is arranged along an optical path; the geometrical center of the beam splitter (3) with the diaphragm is positioned at the center of the image plane of the front objective lens and is also positioned at the front focus positions of the first collimating objective lens (4), the second collimating objective lens (6) and the third collimating objective lens (8); the geometric center of the first reflection grating (5) is positioned at the back focus position of the first collimating objective lens (4), the geometric center of the second reflection grating (7) is positioned at the back focus position of the second collimating objective lens (6), and the photosensitive surface of the area array camera (9) is positioned at the back focus position of the third collimating objective lens (8). All optical elements are of coaxial contour with respect to the substrate, i.e. with respect to the optical platform or the instrument base.
Preferably, the first collimator objective (4) and the second collimator objective (6) have the same specifications.
The first collimating objective (4) and the third collimating objective (8) form a 4f system, and the diffraction light wave surface of the first reflecting grating (5) can be imaged on the photosensitive surface of the area-array camera (9); the second collimating objective (6) and the third collimating objective (8) form a 4f system, and the diffraction light wave surface of the second reflecting grating (7) can be imaged on the photosensitive surface of the area-array camera (9).
The first reflection grating (5) and the second reflection grating (7) have the same specification; when the Raman spectrum excitation light source is the same frequency as the laser incidence system, the included angle between the incident light of the first reflection grating (5) and the normal line is Littrow angle, and the included angle between the incident light of the second reflection grating (7) and the normal line is Littrow angle.
As shown in fig. 2, the beam splitter (3) with a diaphragm is composed of a beam splitter, a front surface diaphragm (311) and a rear surface diaphragm (312), and the beam passing width of the beam splitter (3) with a diaphragm can be adjusted by controlling the diaphragm size. The beam splitter (313) is composed of two pieces of ultraviolet quartz optical glass or two pieces of ultraviolet plastic glass, and a short wave ultraviolet semi-transparent semi-reflective film is coated at the joint of the two pieces of lenses.
In use, the first reflection grating (5) and the second reflection grating (7) produce a plurality of orders of diffracted light beams, only one effective diffraction order of the optical signal being detected. If other invalid diffraction order optical signals enter the area array camera (9), stray light and false peaks can be formed, and the sensitivity and the accuracy of short wave ultraviolet Raman spectrum detection are affected. The 4f imaging system formed by the first collimating objective lens (4) and the third collimating objective lens (8) is matched with the beam splitter (3) with the diaphragm, so that invalid diffraction order stray light formed by the first reflection grating (5) can be subjected to filtering treatment. The 4f imaging system formed by the second collimating objective (6) and the third collimating objective (8) is matched with the beam splitter (3) with the diaphragm, so that invalid diffraction order stray light formed by the second reflection grating (7) can be subjected to filtering treatment. The trend of the invalid diffraction order stray light path is shown by a dotted line in fig. 1, and is effectively blocked by the beam splitter (3) with the diaphragm, so that the invalid diffraction order stray light path cannot enter the area camera (9). The invention can effectively inhibit invalid diffraction order stray light generated by the grating, and can improve the signal to noise ratio of short wave ultraviolet Raman spectrum detection, thereby improving the sensitivity; meanwhile, the occurrence of a false peak is avoided, and the accuracy of short wave ultraviolet Raman spectrum detection is improved.
Referring to fig. 1, the low-noise space heterodyne spectrometer for short-wave ultraviolet Raman spectrum detection comprises a front objective lens (1), a Raman filter (2), a beam splitter (3) with a diaphragm, a first collimating objective lens (4), a first reflection grating (5), a second collimating objective lens (6), a second reflection grating (7), a third collimating objective lens (8) and an area array camera (9), wherein the front objective lens is arranged along an optical path; the geometrical center of the beam splitter (3) with the diaphragm is positioned at the center of the image plane of the front objective lens and is also positioned at the front focus positions of the first collimating objective lens (4), the second collimating objective lens (6) and the third collimating objective lens (8); the geometric center of the first reflection grating (5) is positioned at the back focus position of the first collimating objective lens (4), the geometric center of the second reflection grating (7) is positioned at the back focus position of the second collimating objective lens (6), and the photosensitive surface of the area array camera (9) is positioned at the back focus position of the third collimating objective lens (8). All optical elements are of coaxial contour with respect to the substrate, i.e. with respect to the optical platform or the instrument base.
Claims (4)
1. The utility model provides a low noise space heterodyne spectrum appearance that is used for shortwave ultraviolet Raman spectrum to survey which characterized in that: the optical system comprises a front objective (1), a Raman filter (2), a beam splitter (3) with a diaphragm, a first collimating objective (4), a first reflection grating (5), a second collimating objective (6), a second reflection grating (7), a third collimating objective (8) and an area camera (9), wherein the front objective is arranged along an optical path; the geometrical center of the beam splitter (3) with the diaphragm is positioned at the center of the image plane of the front objective lens and is also positioned at the front focus positions of the first collimating objective lens (4), the second collimating objective lens (6) and the third collimating objective lens (8); the geometric center of the first reflection grating (5) is positioned at the back focal position of the first collimating objective lens (4), the geometric center of the second reflection grating (7) is positioned at the back focal position of the second collimating objective lens (6), and the photosensitive surface of the area array camera (9) is positioned at the back focal position of the third collimating objective lens (8); the beam splitter (3) with the diaphragm consists of a beam splitter and diaphragms on the front surface and the rear surface, and the light passing width of the beam splitter (3) with the diaphragm is adjusted by controlling the size of the diaphragm; the beam splitter in the beam splitter (3) with the diaphragm is composed of two pieces of ultraviolet quartz optical glass or two pieces of ultraviolet plastic glass, and a short wave ultraviolet semi-transparent semi-reflective film is coated at the joint of the two pieces of ultraviolet quartz optical glass or the two pieces of ultraviolet plastic glass.
2. A low noise spatial heterodyne spectrometer for short wave ultraviolet raman spectroscopy according to claim 1, wherein: the first collimating objective lens (4) and the second collimating objective lens (6) have the same specification.
3. A low noise spatial heterodyne spectrometer for short wave ultraviolet raman spectroscopy according to claim 1, wherein: the first collimating objective (4) and the third collimating objective (8) form a 4f system, and the diffraction light wave surface of the first reflecting grating (5) can be imaged on the photosensitive surface of the area-array camera (9); the second collimating objective (6) and the third collimating objective (8) form a 4f system, and the diffraction light wave surface of the second reflecting grating (7) can be imaged on the photosensitive surface of the area-array camera (9).
4. A low noise spatial heterodyne spectrometer for short wave ultraviolet raman spectroscopy according to claim 1, wherein: the first reflection grating (5) and the second reflection grating (7) have the same specification; when the Raman spectrum excitation light source is the same frequency as the laser incidence system, the included angle between the incident light of the first reflection grating (5) and the normal line is Littrow angle, and the included angle between the incident light of the second reflection grating (7) and the normal line is Littrow angle.
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| CN103033265A (en) * | 2012-12-21 | 2013-04-10 | 南京理工大学 | Device and method of space heterodyning interference hyper spectrum imaging |
| CN108181237B (en) * | 2018-02-05 | 2019-09-27 | 中国科学院长春光学精密机械与物理研究所 | A kind of light channel structure of space heterodyne Raman spectroscopy instrument |
| CN108458787B (en) * | 2018-02-05 | 2019-08-23 | 中国科学院长春光学精密机械与物理研究所 | Echelle grating type space heterodyne Raman spectrometer light channel structure |
| CN108387317A (en) * | 2018-03-06 | 2018-08-10 | 桂林电子科技大学 | A kind of prism-type space heterodyne spectrograph |
| CN110987898A (en) * | 2019-12-06 | 2020-04-10 | 中国科学院合肥物质科学研究院 | Spatial heterodyne offset Raman spectrum detection device and detection method thereof |
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