CN219552364U

CN219552364U - Ultraviolet detector light path system based on prism structure

Info

Publication number: CN219552364U
Application number: CN202320143184.1U
Authority: CN
Inventors: 朱守明
Original assignee: Anhui Wanyi Science and Technology Co Ltd
Current assignee: Anhui Wanyi Science and Technology Co Ltd
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-08-18
Anticipated expiration: 2033-02-07

Abstract

The utility model discloses an ultraviolet detector light path system based on a prism structure, which comprises a light source, a first spherical reflector, a first prism, a second prism, 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 first prism, the second prism, the slit, the second spherical reflector, the grating and the third spherical reflector after being reflected by the first spherical reflector, are focused at an inlet of the flow cell after being reflected by the third spherical reflector, the first prism and the second prism are arranged at positions between the first spherical reflector and the slit, one vertical plane of the first prism is perpendicular to incident light, and one vertical plane of the second prism is perpendicular to light rays penetrating out of the first prism. The utility model has lower cost and compact structure, and can obtain higher detection limit.

Description

Ultraviolet detector light path system based on prism structure

Technical Field

The utility model relates to an ultraviolet detector, in particular to an ultraviolet detector light path system based on a prism structure.

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 ultraviolet detector light path system based on a prism structure comprises a light source, a first spherical reflector, a first prism, a second prism, 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 first prism, the second prism, 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 first prism and the second prism are arranged at the position between the first spherical reflecting mirror and the slit, one of the vertical surfaces of the first prism is perpendicular to incident light, and one of the vertical surfaces of the second prism is perpendicular to light rays penetrating out of the first prism.

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 triangular prism to realize the translation of light, and the light is shaped into circular light spots at the slit, so that the light beam passes through 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;

FIG. 2 is a plot of the spot before and after the optical path using the present utility model;

fig. 3 is a schematic layout diagram of a first prism and a second prism.

Detailed Description

The utility model 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, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection 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 ultraviolet detector light path system based on a prism structure, which includes a light source 1, a first spherical mirror 2, a first prism 3, a second prism 4, a slit 5, a second spherical mirror 7, a grating 6, a third spherical mirror 8, and a flow cell 9. After being reflected by the first spherical reflector 2, the light emitted by the light source 1 sequentially passes through the first triangular prism 3, the second triangular prism 4, the slit 5, the second spherical reflector 7, the grating 6 and the third spherical reflector 8, and is focused at the inlet position of the flow cell 9 after being reflected by the third spherical reflector 8.

Specifically, the first prism 3 and the second prism 4 are disposed at positions between the first spherical reflecting mirror 2 and the slit 5, one of the vertical surfaces of the first prism 3 is perpendicular to the incident light, and one of the vertical surfaces of the second prism 4 is perpendicular to the light passing through the first prism 3, so that the light passing through the second prism 4 is parallel (non-coincident) with the light reflected and focused by the first spherical reflecting mirror 2, and the light is uniformly distributed, so that the light is directed to the position of the slit 5, and the parallel (non-coincident) arrangement of the light restores the problem of the eccentric focused light, and the light spot of the light beam is trimmed to be a circular light spot, thereby ensuring that the light beam can be precisely directed to the slit 5. Thus, in the present utility model, the slit 5 is a small hole slit.

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 5. The second spherical mirror 7 and the third spherical mirror 8 may each be a circular spherical mirror.

The above description is only illustrative of the preferred embodiments of the present utility model and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in the present utility model is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions 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

1. The ultraviolet detector light path system based on the prism structure is characterized by comprising a light source, a first spherical reflector, a first prism, a second prism, 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 first prism, the second prism, 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;

2. The prism structure-based ultraviolet detector optical path system of claim 1, wherein the slit is a small hole slit.

3. The optical path system of an ultraviolet detector based on a prism structure 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 prism structure-based ultraviolet detector optical path system 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.