CN219200630U - Off-axis optical path system of ultraviolet detector - Google Patents
Off-axis optical path system of ultraviolet detector Download PDFInfo
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- CN219200630U CN219200630U CN202320142700.9U CN202320142700U CN219200630U CN 219200630 U CN219200630 U CN 219200630U CN 202320142700 U CN202320142700 U CN 202320142700U CN 219200630 U CN219200630 U CN 219200630U
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Abstract
The utility model discloses an off-axis light path system of an ultraviolet detector, which comprises a light source, a first spherical reflector, a cylindrical mirror, a slit, a second spherical reflector, a grating, a third spherical reflector and a flow cell, wherein light rays emitted by the light source are reflected by the first spherical reflector, sequentially pass through the cylindrical mirror, the slit, the second spherical reflector, the grating and the third spherical reflector, and are focused at an inlet of the flow cell after being reflected by the third spherical reflector; the utility model adopts a mode of combining the spherical mirror and the cylindrical mirror to realize that light is focused into a point shape at the slit. The utility model has lower cost and compact structure, and can obtain higher detection limit.
Description
Technical Field
The present utility model relates to ultraviolet detectors, and more particularly to an off-axis optical path system for an ultraviolet detector.
Background
The existing ultra-high performance liquid chromatograph ultraviolet detectors all use an aspherical mirror, because the detection light path of the ultra-high performance liquid chromatograph is an off-axis light path, and only the aspherical mirror is used for focusing light rays into a point so as to improve the detection precision, and the off-axis light path only can realize focusing in one direction by using the spherical mirror. But the processing cost of the aspherical mirror is very expensive, which is unfavorable for the comprehensive use of enterprises.
Disclosure of Invention
In order to solve the above-mentioned shortcomings in the prior art, an object of the present utility model is to provide an off-axis optical path system of an ultraviolet detector, which is advantageous in saving costs.
The technical scheme adopted for solving the technical problems is as follows: an off-axis light path system of an ultraviolet detector comprises a light source, a first spherical reflector, a cylindrical mirror, a slit, a second spherical reflector, a grating, a third spherical reflector and a flow cell, wherein light rays emitted by the light source sequentially pass through the cylindrical mirror, the slit, the second spherical reflector, the grating and the third spherical reflector after being reflected by the first spherical reflector, and are focused at an inlet of the flow cell after being reflected by the third spherical reflector;
the cylindrical mirror is arranged at a position between the first spherical mirror and the slit, the slit is arranged in a focal plane of light formed after being reflected by the first spherical mirror, and the distance from the cylindrical mirror to the slit is matched with the focal length of the light formed after being reflected by the first spherical mirror, so that a horizontal focus of the light formed after being reflected by the first spherical mirror is positioned at the position of the slit after penetrating through the cylindrical mirror.
Optionally, the slit is a small hole slit.
Optionally, the light source is a deuterium lamp, and the wave band of the light source emitted by the deuterium lamp is 190-900 nm.
Optionally, the first spherical mirror is a rectangular spherical mirror, and the second spherical mirror and the third spherical mirror are both circular spherical mirrors.
By adopting the technical scheme, the utility model adopts a mode of combining the spherical mirror and the cylindrical mirror to realize that light is focused into a point shape at the slit. The utility model has lower cost and compact structure, and can obtain higher detection limit.
Drawings
Fig. 1 is a schematic diagram of the system architecture of the present utility model.
Detailed Description
The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
At present, in a common liquid chromatograph, a slit of an ultraviolet detector is generally a relatively slender slit, and a light band is formed at a position of the slit by a detection light beam, so that the detection light beam also forms a light band at an inlet position of a flow cell, and a photodiode for detecting a reference signal and a photodiode for detecting a sample signal are placed on the light band side by side, so that more light loss is generated, and the detection limit is not high. Therefore, in ultra-high performance liquid chromatography, the ultraviolet detector generally adopts an aspherical mirror to perform focusing treatment so as to increase the detection limit of the ultraviolet detector. However, the processing cost of the aspherical mirror is relatively expensive, which is unfavorable for the development of enterprises.
Based on this, as shown in fig. 1, the present utility model provides an off-axis optical path system of an ultraviolet detector, which includes a light source 1, a first spherical mirror 2, a cylindrical mirror 3, a slit 4, a second spherical mirror 5, a grating 7, a third spherical mirror 6, and a flow cell 8. After being reflected by the first spherical reflector 2, the light rays emitted by the light source 1 sequentially pass through the cylindrical mirror 3, the slit 4, the second spherical reflector 5, the grating 7 and the third spherical reflector 6, and are focused at the inlet position of the flow cell 8 after being reflected by the third spherical reflector 6.
Specifically, the cylindrical mirror 3 is installed at a position between the first spherical mirror 2 and the slit 4, the slit 4 is disposed in a focal plane of the light beam formed after being reflected by the first spherical mirror 2, and a distance from the cylindrical mirror 3 to the slit 4 is adapted to a focal length of the light beam formed after being reflected by the first spherical mirror 2, so that a horizontal focal point of the light beam formed after being reflected by the first spherical mirror 2 after penetrating the cylindrical mirror 3 is located at the position of the slit 4. With this arrangement, the light from the light source 1 is focused in the vertical direction by the first spherical mirror 2 and reflected, and then focused in the horizontal direction by the cylindrical mirror 3, so that the light is focused in both the horizontal and vertical directions at the position of the slit 4 to a light spot which is located at the slit 4 and then passes through the slit 4. Thus, in the present utility model, the slit 4 is a small hole slit, that is, the light spot focused by the first spherical mirror 2 and the cylindrical mirror 3 falls at the small hole position of the slit 4.
In the utility model, the light source 1 can adopt a deuterium lamp, and the wave band of the emitted light source is 190-900 nm. Furthermore, the first spherical mirror 2 may be a rectangular spherical mirror, the side length of which is adapted to the numerical aperture of the spot at the position of the slit 4. The second spherical mirror 5 and the third spherical mirror 6 may each be a circular spherical mirror.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the utility model. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Other technical features besides those described in the specification are known to those skilled in the art, and are not described herein in detail to highlight the innovative features of the present utility model.
Claims (4)
1. The off-axis light path system of the ultraviolet detector is characterized by comprising a light source, a first spherical reflector, a cylindrical reflector, a slit, a second spherical reflector, a grating, a third spherical reflector and a flow cell, wherein light rays emitted by the light source are reflected by the first spherical reflector, sequentially pass through the cylindrical reflector, the slit, the second spherical reflector, the grating and the third spherical reflector, and are focused at an inlet of the flow cell after being reflected by the third spherical reflector;
the cylindrical mirror is arranged at a position between the first spherical mirror and the slit, the slit is arranged in a focal plane of light formed after being reflected by the first spherical mirror, and the distance from the cylindrical mirror to the slit is matched with the focal length of the light formed after being reflected by the first spherical mirror, so that a horizontal focus of the light formed after being reflected by the first spherical mirror is positioned at the position of the slit after penetrating through the cylindrical mirror.
2. The off-axis optical path system of an ultraviolet detector of claim 1, wherein the slit is a small hole slit.
3. The off-axis optical path system of an ultraviolet detector according to claim 1, wherein the light source is a deuterium lamp, and the wavelength band of the light source emitted by the deuterium lamp is 190-900 nm.
4. The off-axis optical path system of an ultraviolet detector of claim 1, wherein the first spherical mirror is a rectangular spherical mirror and the second and third spherical mirrors are both circular spherical mirrors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320142700.9U CN219200630U (en) | 2023-02-07 | 2023-02-07 | Off-axis optical path system of ultraviolet detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320142700.9U CN219200630U (en) | 2023-02-07 | 2023-02-07 | Off-axis optical path system of ultraviolet detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219200630U true CN219200630U (en) | 2023-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320142700.9U Active CN219200630U (en) | 2023-02-07 | 2023-02-07 | Off-axis optical path system of ultraviolet detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219200630U (en) |
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2023
- 2023-02-07 CN CN202320142700.9U patent/CN219200630U/en active Active
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