Spectrum detection system

Abstract

The invention discloses a spectrum detection system, and relates to the technical field of spectrum detection, the spectrum detection system comprises a sample cell, a slit, an optical splitter and an area array detector, laser from a sample passes through the slit, the optical splitter and the area array detector in sequence; the optical splitter is used for diffracting and splitting light with different wavelengths; according to the invention, by utilizing the linear transmission characteristic of laser and the weak absorption and scattering characteristics of gas and liquid on laser, and by utilizing the slit imaging characteristic of the imaging spectrometer, the excitation and signal detection capabilities on a sample are greatly improved by adopting a linear excitation and linear collection mode.

Description

Technical Field

[0001] The present invention relates to the technical field of spectrum detection, in particular to a spectrum detection system. Background Art

[0002] With the continuous development of laser technology, the Raman and fluorescence detection technology and application scope using laser as excitation source are becoming more and more extensive. The detection objects in practical applications are diverse, and solids, liquids and gases can all use laser as excitation source to detect Raman and fluorescence signals.

[0003] Conventional Raman and fluorescence detection systems mostly use a point excitation and point collection test method. That is, the laser is focused on the sample to be tested, and then the fluorescence or scattering (Raman, Rayleigh) signal generated by the laser point on the sample is collected through the collection optical path to the spectral signal measurement device for detection. The existing laser excitation Raman and fluorescence spectrum test system, whose collection optical path is suitable for non-transparent samples such as solid and powder samples, while for transparent substances such as gas and liquid, the absorption and scattering cross-section of the excitation light is low, and the excited light or Raman signal is also weak, resulting in low collection efficiency.

[0004] In view of this, a spectrum detection system is urgently needed. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention solves the problems with the following technical structure.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A spectrum detection system comprises: a sample pool, a slit, a spectrometer and a planar array detector, wherein the laser from the sample passes through the slit, the spectrometer and the planar array detector in sequence;

[0008] The spectrometer is used for diffracting and splitting lights of different wavelengths.

[0009] A further feature is that

[0010] A first collimating lens for collimating the laser light from the slit is arranged between the slit and the beam splitter.

[0011] A first focusing lens is arranged between the beam splitter and the area array detector.

[0012] The slit, the first collimating lens, the beam splitter and the area array detector are distributed in a straight line.

[0013] A collecting reflector for collecting scattering or fluorescence signals generated by the sample is arranged on one side of the sample pool away from the slit.

[0014] A second collimating lens is arranged between the sample pool and the slit.

[0015] A laser filter is arranged between the second collimating lens and the slit.

[0016] A second focusing lens is arranged between the laser filter and the slit.

[0017] The collecting reflector, the second collimating lens, the laser filter, the second focusing lens and the slit are distributed in a straight line.

[0018] A slit plate is arranged between the second focusing lens and the first collimating lens, and the slit is opened on the slit plate.

[0019] The above structure of the present invention can achieve the following beneficial effects:

[0020] By utilizing the linear transmission characteristics of lasers and the weak absorption and scattering characteristics of gases and liquids to lasers, and the slit imaging characteristics of imaging spectrometers, the line excitation and line collection method is adopted to greatly improve the excitation and signal detection capabilities of samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of this embodiment.

[0022] In the figure: 2-1, sample cell; 2-2, collecting reflector; 2-3, second collimating lens; 2-4, laser filter; 2-5, second focusing lens; 3, spectral detection unit; 3-1-1, slit; 3-1-2, first collimating lens; 3-1-3, spectrometer; 3-1-4, first focusing mirror; 3-1-5, area array detector. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0025] The following is combined with Figure 1 This application is described in further detail.

[0026] refer to Figure 1 A spectrum detection system shown in the figure includes: a sample pool 2-1, a slit 3-1-1, a first collimating lens 3-1-2, a beam splitter 3-1-3, a first focusing lens 3-1-4 and a planar array detector 3-1-5, wherein the slit 3-1-1, the first collimating lens 3-1-2, the beam splitter 3-1-3, the first focusing lens 3-1-4 and the planar array detector 3-1-5 are arranged in a straight line, and the laser from the sample passes through the slit 3-1-1, the first collimating lens 3-1-2, the beam splitter 3-1-3, the first focusing lens 3-1-4 and the planar array detector 3-1-5 in sequence, and the signal light from the sample pool is focused to the slit 3-1-1 and then passes through the first collimating lens 3-1-2 After collimation, the light of different wavelengths is diffracted and split by the beam splitter 3-1-3, and then the signal light of different wavelengths is focused to the Y direction of the array detector 3-1-5 through the first focusing lens 3-1-4. The Y direction of the array detector 3-1-5 corresponds to the signals of different wavelengths, and the X direction corresponds to the spatial dimension information in the direction of the slit length, that is, each column of the array detector 3-1-5 corresponds to the spectral information of a point in the direction of the slit length. The detector signal is accumulated and integrated along the X direction (along the X direction, that is, corresponding to the slit length direction, the signal is accumulated to achieve signal integration enhancement), which can realize line integral detection of the scattered or fluorescent signal generated by the laser line excitation, and improve the signal strength and detection sensitivity. It is also possible to detect each point separately to realize line imaging and counting detection of the signal on the excitation line, such as microplastics in solution, particulate matter in gas, and abnormal cell detection in blood.

[0027] like Figure 1 As shown, this embodiment also includes a collecting reflector 2-2 for collecting the scattering or fluorescence signals generated by the sample, a collimating lens 2-3 for collimating the scattering and fluorescence signals collected by the collecting reflector 2-2, a laser filter 2-4 and a second focusing lens 2-5. The collecting reflector 2-2, the second collimating lens 2-3, the laser filter 2-4, the second focusing lens 2-5 and the slit are distributed in a straight line. The collimated laser passes through the laser filter 2-4 and enters the spectrum detection unit 3. The second focusing lens 2-5 focuses the laser entering the spectrum detection unit. The scattering or fluorescence signals generated by the gas or liquid sample in the sample pool 2-1 by laser excitation are collected and collimated by the collecting reflector 2-2 and the collimating lens 2-3, and then the excitation light is filtered out by the laser filter 2-4 and the signal light is focused to the spectrum detection unit 3 by the second focusing lens 2-5.

[0028] It is further optimized that a slit plate is provided between the second focusing lens 2-5 and the first collimating lens 3-1-2, and the slit 3-1-1 is provided on the slit plate.

[0029] In summary, the present application utilizes the line transmission characteristics of lasers and the weak absorption and scattering characteristics of gases and liquids to lasers, utilizes the slit imaging characteristics of the imaging spectrometer, and adopts the line excitation and line collection method to greatly enhance the excitation and signal detection capabilities of samples. The present application can be applied to non-transparent samples such as solids and powder samples, as well as transparent substances such as gases and liquids.

[0030] The above are only preferred embodiments of the present application, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A spectrum detection system, characterized in that: include: A sample pool, a slit, a beam splitter and an array detector, wherein the laser light from the sample passes through the slit, the beam splitter and the array detector in sequence; The spectrometer is used for diffracting and splitting lights of different wavelengths.

2. A spectrum detection system according to claim 1, characterized in that: A first collimating lens for collimating the laser light from the slit is arranged between the slit and the beam splitter.

3. A spectrum detection system according to claim 2, characterized in that: A first focusing lens is arranged between the beam splitter and the area array detector.

4. A spectrum detection system according to claim 3, characterized in that: The slit, the first collimating lens, the beam splitter and the area array detector are distributed in a straight line.

5. A spectrum detection system according to claim 1, characterized in that: A collecting reflector for collecting scattering or fluorescence signals generated by the sample is arranged on one side of the sample pool away from the slit.

6. A spectrum detection system according to claim 5, characterized in that: A second collimating lens is arranged between the sample pool and the slit.

7. A spectrum detection system according to claim 6, characterized in that: A laser filter is arranged between the second collimating lens and the slit.

8. A spectrum detection system according to claim 7, characterized in that: A second focusing lens is arranged between the laser filter and the slit.

9. A spectrum detection system according to claim 8, characterized in that: The collecting reflector, the second collimating lens, the laser filter, the second focusing lens and the slit are distributed in a straight line.

10. A spectrum detection system according to claim 8, characterized in that: A slit plate is arranged between the second focusing lens and the first collimating lens, and the slit is opened on the slit plate.

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