Spectrometer
By employing a lead sulfide quantum dot photodetector in the spectrometer, the problem of limited detection range in traditional spectrometers was solved, achieving a wide spectral response of 400nm-1800nm, improving detection efficiency and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-24
AI Technical Summary
Traditional spectrometers have limited detection range and require detector replacement to adapt to different spectral regions, resulting in low detection efficiency and high cost.
By employing a lead sulfide quantum dot photodetector, combined with a light-emitting element, aperture, beam splitter, collimation and focusing element, a wide spectral response of 400nm-1800nm is achieved without the need to replace the detector.
It improves detection efficiency, reduces detection costs, and achieves a spectrometer with a wide spectral response.
Smart Images
Figure CN224035242U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of spectrometer, and in particular to a spectrometer. BACKGROUND
[0002] In the related art, a spectrometer is a scientific instrument that applies optical principles to decompose complex light into spectral lines, and is a basic device for observing, analyzing and processing the structure and composition of a substance, and has advantages of high analysis accuracy, large measurement range, fast speed and small sample usage. Therefore, the resolution of molecular characteristics, the measurement of concentration, the identification of substances and the measurement of celestial spectra all need the assistance of a spectrometer, and the spectrometer is widely used in various fields such as metallurgy, base paper, petroleum chemical industry, medicine and health, environmental protection, resource and hydrological survey.
[0003] However, the conventional spectrometer is limited by materials, resulting in a limited range of analyzable spectral wavelengths. For example, when a wide-band spectrum covering 400nm-1800nm needs to be detected, the detector must be replaced to adapt to different spectral regions, which not only reduces the detection efficiency, but also increases the complexity of operation, and also has the problem of high detection cost because multiple different detectors need to be prepared. CONTENT OF THE INVENTION
[0004] The present application provides a wide-spectrum response spectrometer to solve the technical problem of small detection range of the existing spectrometer.
[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a spectrometer, comprising:
[0006] A light-emitting element for emitting light;
[0007] A diaphragm arranged on the propagation path of the light emitted by the light-emitting element, for limiting the width of the light emitted by the light-emitting element and passing through the diaphragm;
[0008] A light-splitting element arranged on the propagation path of the light irradiated through the diaphragm, for dispersing the light irradiated through the diaphragm into light of multiple wavelengths;
[0009] A lead sulfide quantum dot photodetector arranged on the propagation path of the light dispersed by the light-splitting element, for receiving the light dispersed by the light-splitting element and converting the light into an electrical signal.
[0010] As an implementation manner, the light-emitting element comprises a xenon lamp or a halogen lamp; and / or,
[0011] The light-splitting element comprises a prism or a grating.
[0012] As an implementation form, the spectrometer further comprises a collimating element arranged in a propagation path of the light rays irradiated through the diaphragm, the collimating element being located between the diaphragm and the dispersing element, the collimating element being configured to adjust the light rays passing through the diaphragm into parallel light rays.
[0013] As an implementation form, the collimating element comprises a single lens or a single mirror.
[0014] As an implementation form, the spectrometer further comprises a focusing element arranged in a propagation path of the light rays dispersed by the dispersing element, the focusing element being configured to converge the light rays onto the lead sulfide quantum dot photodetector.
[0015] As an implementation form, the focusing element comprises at least one lens and / or at least one mirror.
[0016] As an implementation form, the lead sulfide quantum dot photodetector comprises a substrate, a first electrode, a second electrode and a photosensitive layer.
[0017] At least one of the first electrode and the second electrode is arranged on the substrate.
[0018] The photosensitive layer is arranged on the substrate, the photosensitive layer being connected between the first electrode and the second electrode, the photosensitive layer being configured to absorb light signals and form electron-hole pairs, the first electrode and the second electrode being configured to form an electric field with the substrate, the electric field being configured to separate the electron-hole pairs into electrons and holes and to migrate one of the electrons and holes to the first electrode and the other to the second electrode.
[0019] As an implementation form, the photosensitive layer is a lead sulfide quantum dot film; and / or,
[0020] The lead sulfide quantum dot photodetector further comprises a hole transport layer and an electron transport layer, one of the hole transport layer and the electron transport layer being arranged between the first electrode and the photosensitive layer, and the other being arranged between the second electrode and the photosensitive layer, the hole transport layer being configured to transport the holes, and the electron transport layer being configured to transport the electrons to accelerate the separation of the electron-hole pairs.
[0021] As an implementation form, the lead sulfide quantum dot photodetector is a single-point lead sulfide quantum dot photodetector or a linear array lead sulfide quantum dot photodetector or a planar array lead sulfide quantum dot photodetector.
[0022] As an implementation form, the spectrometer further comprises a controller configured to receive and analyze the electrical signal generated by the lead sulfide quantum dot photodetector.
[0023] The spectrometer provided in the embodiments of the present application has the following beneficial effects: the spectrometer can cover a wide spectral region by using the Pbs quantum dot photodetector, so that the spectrometer does not need to replace the detector when detecting, thereby improving the detection efficiency and reducing the cost. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:
[0025] Figure 1 is a structural schematic diagram of the spectrometer provided in the embodiments of the present application;
[0026] Figure 2 is a structural schematic diagram of the spectrometer provided in the embodiments of the present application using a single-point lead sulfide quantum dot photodetector;
[0027] Figure 3 is a structural schematic diagram of the spectrometer provided in the embodiments of the present application using a linear array lead sulfide quantum dot photodetector;
[0028] Figure 4 is a structural schematic diagram of the spectrometer provided in the embodiments of the present application using a two-dimensional array lead sulfide quantum dot photodetector.
[0029] Explanation of reference signs: 100, light emitting element; 200, diaphragm; 300, collimating element; 400, light splitting element; 500, focusing element; 600, lead sulfide quantum dot photodetector; 610, single-point lead sulfide quantum dot photodetector; 620, linear array lead sulfide quantum dot photodetector; 630, two-dimensional array lead sulfide quantum dot photodetector. DETAILED DESCRIPTION
[0030] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0031] It should be noted that if the application embodiments have directionality indications (such as up, down, left, right, front, back, etc.), the directionality indications are only used to explain the relative position relationship, movement, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.
[0032] In addition, if the application embodiments have descriptions of "first", "second", etc., the "first", "second", etc. descriptions are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the application.
[0033] Please refer to Figures 1-4 As shown in the drawings, the application embodiments provide a spectrometer, which includes a light emitting element 100, a diaphragm 200, a light splitting element 400, and a lead sulfide quantum dot photodetector 600.
[0034] The light emitting element 100 is used to emit light, and the diaphragm 200 is arranged on the propagation path of the light emitted by the light emitting element 100. The diaphragm 200 is used to limit the width of the light emitted by the light emitting element 100 and passing through the diaphragm 200, so as to control the resolution of the spectrum.
[0035] The diaphragm 200 adopts an entrance slit to limit the width of the light emitted by the light emitting element 100 and passing through the entrance slit, so as to control the resolution of the spectrum.
[0036] As an implementation manner, the width of the entrance slit is controlled by a precision stepping motor to be between 1um and 5um, so as to concentrate the incident light to improve the resolution of the spectrometer.
[0037] The light splitting element 400 is arranged on the propagation path of the light irradiated by the diaphragm 200, and is used to disperse the light irradiated by the diaphragm 200 into light of multiple wavelengths to form a spectrum.
[0038] The lead sulfide quantum dot photodetector 600 is arranged on the propagation path of the light dispersed by the light splitting element 400, and is used to receive the light dispersed by the light splitting element 400 and convert the light into an electrical signal. The lead sulfide quantum dot photodetector 600 can achieve a wide spectral response of 400nm-1800nm. A conventional spectrometer needs to replace the silicon material detector to detect light of 400nm-1100nm, and replace the indium gallium arsenide material detector to detect light of 1100nm-1800nm. The spectrometer based on the lead sulfide quantum dot photodetector 600 does not need to replace the type of detector to detect light of 400nm-1800nm, realizes wide spectral response detection, improves detection efficiency and reduces detection cost.
[0039] As an embodiment, the light emitting element 100 includes a xenon lamp or a halogen lamp, which can excite a wider range of spectrum and higher light intensity output than conventional light sources, so that the spectrum obtains a clearer signal and a higher signal-to-noise ratio.
[0040] As an embodiment, the light splitting element 400 includes a prism or a grating, wherein the spectral range of the grating is 200nm-4000nm, and the grating uses a blazed grating or a reflective grating to reduce the loss of optical power.
[0041] As an embodiment, the spectrometer further includes a collimating element 300 arranged on the propagation path of the light irradiated by the light stop 200, the collimating element 300 being located between the light stop 200 and the light splitting element 400, and the collimating element 300 being used to adjust the light passing through the light stop 200 into parallel light so as to facilitate the light splitting element 400 to perform light splitting processing on the light.
[0042] As an embodiment, the collimating element 300 includes a single lens, which adjusts the light emitted by the light stop 200 into parallel light. Of course, in specific applications, as an alternative embodiment, the collimating element 300 includes a single mirror, which reflects the light into parallel light so as to facilitate the light splitting element 400 to perform light splitting processing on the light.
[0043] As an embodiment, the spectrometer further includes a focusing element 500 arranged on the propagation path of the light dispersed by the light splitting element 400, and the focusing element 500 is used to converge the light onto the lead sulfide quantum dot photodetector 600, so as to improve the resolution and imaging quality of the spectrometer.
[0044] As an implementation, the focusing element 500 includes at least one lens, and the light emitted by the light splitting element 400 is focused on the lead sulfide quantum dot photodetector 600 through one or more lenses, so that the lead sulfide quantum dot photodetector 600 can better receive the light. In the above technical solution, at least one lens is used as the focusing element 500 to focus the light. Of course, in specific applications, as an alternative implementation, the focusing element 500 includes at least one mirror, and the light emitted by the light splitting element 400 is reflected by one or more mirrors, so that the lead sulfide quantum dot photodetector 600 can better receive the light.
[0045] As an implementation, the lead sulfide quantum dot photodetector 600 includes a substrate, a first electrode, a second electrode, and a photosensitive layer.
[0046] At least one of the first electrode and the second electrode is arranged on the substrate, and the first electrode and the second electrode are used to form an electric field with the photosensitive layer, which helps to convert light into electron-hole pairs.
[0047] The photosensitive layer is arranged on the substrate and connected between the first electrode and the second electrode. The photosensitive layer is used to absorb light signals and form electron-hole pairs. When light irradiates the photosensitive layer, it will excite the band from the valence band to the conduction band to generate electron-hole pairs. The first electrode and the second electrode are used to form an electric field with the photosensitive layer, which is used to separate the electron-hole pairs into electrons and holes and make one of the electrons and holes migrate to the first electrode and the other migrate to the second electrode, thereby forming a current to realize photoelectric conversion.
[0048] In the above solution, the lead sulfide quantum dot photodetector 600 includes a substrate, a first electrode, a second electrode, and a photosensitive layer. Of course, in specific applications, as an alternative implementation, the lead sulfide quantum dot photodetector 600 further includes a hole transport layer and an electron transport layer based on the above solution. One of the hole transport layer and the electron transport layer is arranged between the first electrode and the photosensitive layer, and the other is arranged between the second electrode and the photosensitive layer. The hole transport layer is used to transport holes to promote the separation of electron-hole pairs. The hole is a positive charge carrier. The electron transport layer is used to transport electrons to speed up the separation of electron-hole pairs. When light irradiates the photosensitive layer, the photosensitive layer will generate electron-hole pairs. The hole transport layer is used to maintain an electric field and promote the separation of electron-hole pairs and transport holes. The electron transport layer is used to maintain an electric field and promote the separation of electron-hole pairs and transport electrons, thereby improving the photoelectric conversion efficiency of the lead sulfide quantum dot photodetector 600.
[0049] As an implementation form, the lead sulfide quantum dot photoelectric detector 600 is a single-point lead sulfide quantum dot photoelectric detector 610. The single-point lead sulfide quantum dot photoelectric detector 610 has the effects of fast response speed, high sensitivity and low cost, and can realize the lowest cost spectral response.
[0050] In the above scheme, the lead sulfide quantum dot photoelectric detector 600 is a single-point lead sulfide quantum dot photoelectric detector 610. Of course, in specific applications, as an alternative implementation form, the lead sulfide quantum dot photoelectric detector 600 is a linear array lead sulfide quantum dot photoelectric detector 620. The linear array lead sulfide quantum dot photoelectric detector 620 can realize more precise spectral detection than the single-point lead sulfide quantum dot photoelectric detector 610.
[0051] Of course, in specific applications, as an alternative implementation form, the lead sulfide quantum dot photoelectric detector 600 can also use a two-dimensional array lead sulfide quantum dot photoelectric detector 630. The two-dimensional array lead sulfide quantum dot photoelectric detector 630 is usually used when imaging processing is required.
[0052] As an implementation form, the spectrometer further includes a controller configured to receive and analyze the electrical signal emitted by the lead sulfide quantum dot photoelectric detector 600, so as to extract the light intensity information of each wavelength, and generate a spectral graph or a spectral curve according to the processed data.
[0053] The spectrometer in the embodiment of the present application emits light through the light emitting element 100, the light irradiates the diaphragm 200 and the width of the light is limited through the diaphragm 200, so as to control the resolution of the spectrum, the light irradiates the collimating element 300 after passing through the diaphragm 200, the light beam is adjusted to be parallel light through the collimating element 300, so as to facilitate subsequent processing of the light, the light adjusted through the collimating element 300 is dispersed into light of multiple wavelengths through the light splitting element 400, so as to form a spectrum, the light dispersed and formed through the light splitting element 400 is focused on the lead sulfide quantum dot photoelectric detector 600 through the focusing element 500, the lead sulfide quantum dot photoelectric detector 600 converts the light into an electrical signal, and finally the electrical signal emitted by the lead sulfide quantum dot photoelectric detector 600 is received through the controller, so as to extract the light intensity information of each wavelength, and generate a spectral graph or a spectral curve according to the processed data.
[0054] In summary, the spectrometer in the embodiment of the present application uses the Pbs quantum dot photoelectric detector, so that the spectrometer can cover a wider spectral region, thereby eliminating the need to replace the detector when detecting, improving the detection efficiency and reducing the cost.
[0055] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. A spectrometer, characterized in that, include: A light-emitting element (100) for emitting light; Aperture (200) is provided on the propagation path of the light emitted by the light-emitting element (100), and the aperture (200) is used to limit the width of the light emitted by the light-emitting element (100) and passing through the aperture (200); A beam splitter (400) is disposed on the propagation path of the light emitted through the aperture (200) and is used to disperse the light emitted through the aperture (200) into multiple wavelengths. A lead sulfide quantum dot photodetector (600) is disposed on the propagation path of the light formed by the beam splitter (400) and is used to receive the light formed by the beam splitter (400) and convert the light into an electrical signal.
2. The spectrometer according to claim 1, characterized in that, The light-emitting element (100) includes a xenon lamp or a halogen lamp; and / or, The beam splitter (400) includes a prism or a grating.
3. The spectrometer according to claim 1, characterized in that, The spectrometer further includes a collimating element (300), which is disposed on the propagation path of the light emitted through the aperture (200). The collimating element (300) is located between the aperture (200) and the beam splitter (400), and is used to adjust the light passing through the aperture (200) into parallel light.
4. The spectrometer according to claim 3, characterized in that, The collimating element (300) includes a single lens or a single reflector.
5. The spectrometer according to any one of claims 1 to 4, characterized in that, The spectrometer also includes a focusing element (500), which is disposed on the propagation path of the light formed by the dispersion of the beam splitter (400). The focusing element (500) is used to focus the light onto the lead sulfide quantum dot photodetector (600).
6. The spectrometer according to claim 5, characterized in that, The focusing element (500) includes at least one lens and / or at least one reflector.
7. The spectrometer according to any one of claims 1 to 4, characterized in that, The lead sulfide quantum dot photodetector (600) includes a substrate, a first electrode, a second electrode, and a photosensitive layer; At least one of the first electrode and the second electrode is disposed on the substrate; The photosensitive layer is disposed on the substrate and connected between the first electrode and the second electrode. The photosensitive layer is used to absorb light signals and form electron-hole pairs. The first electrode and the second electrode are used to form an electric field with the photosensitive layer. The electric field is used to separate the electron-hole pairs into electrons and holes and cause one of the electrons and holes to migrate to the first electrode and the other to migrate to the second electrode.
8. The spectrometer according to claim 7, characterized in that, The photosensitive layer is a lead sulfide quantum dot film; and / or The lead sulfide quantum dot photodetector (600) further includes a hole transport layer and an electron transport layer. One of the hole transport layer and the electron transport layer is disposed between the first electrode and the photosensitive layer, and the other is disposed between the second electrode and the photosensitive layer. The hole transport layer is used to transport the holes, and the electron transport layer is used to transport the electrons to accelerate the separation of the electron-hole pairs.
9. The spectrometer according to any one of claims 1 to 4, characterized in that, The lead sulfide quantum dot photodetector (600) is a single-point lead sulfide quantum dot photodetector (610), a linear array lead sulfide quantum dot photodetector (620), or an area array lead sulfide quantum dot photodetector (630).
10. The spectrometer according to any one of claims 1 to 4, characterized in that, The spectrometer also includes a controller for receiving and analyzing electrical signals emitted by the lead sulfide quantum dot photodetector (600).