Near infrared spectrum analyzer

Abstract

The invention discloses a near infrared spectrum analyzer, and relates to the technical field of spectrum analysis. The near infrared spectrum analyzer comprises a shell, an optical window, at least one partition plate, a light source, a collection device, a detection device and a sample loading device. The optical window and the shell jointly form a closed inner cavity in a surrounding mode. The at least one partition plate is arranged in the inner cavity and divides the inner cavity into at least one transmitting cavity and at least one collecting cavity; the light source is arranged in the emission cavity; the collecting device is arranged in the collecting cavity; and the sample loading device is arranged outside the internal cavity and corresponds to the optical window. According to the design, the near-infrared light emitted by the light source and the light generated after the sample to be detected are respectively propagated in different chambers, so that the interference of the light of the light source on spectral signals collected by the detection device is avoided, the signal noise is reduced, and the accuracy of spectral data is improved.

Description

Technical Field

[0001] The invention relates to the technical field of spectrum analysis, in particular to a near-infrared spectrum analyzer. Background Art

[0002] Near-infrared spectroscopy is a fast and efficient analytical method that is widely used in agriculture, food, medicine, petrochemicals and other fields. Its basic principle is to analyze the absorption spectrum characteristics of hydrogen-containing group chemical bonds in the near-infrared region and establish a correction model to achieve quantitative or qualitative analysis of unknown samples. Near-infrared spectroscopy has the advantages of fast analysis speed, low cost, and suitability for online monitoring. In recent years, it has made significant progress in many industries and has been widely used.

[0003] Existing near-infrared spectrometers usually consist of a light source, a detector, and a sample cup located in the same space. The near-infrared light emitted by the light source irradiates the sample to be tested in the sample cup, and the spectral signal reflected or transmitted by the sample is received and analyzed by the detector, thereby obtaining the spectral information of the sample.

[0004] However, since the light source and the detector are located in the same space, the light emitted by the light source and the light generated after passing through the sample propagate in the same space. This mutual interference will cause the light from the light source to affect the spectral signal collected by the detector, increase signal noise, and thus reduce the accuracy of the spectral data. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a near-infrared spectrometer, which aims to effectively solve the mutual interference problem caused by the light source and the detector being in the same space.

[0006] The technical solution provided by the present invention is as follows: A near-infrared spectrometer, comprising: case; An optical window, which is arranged together with the shell to form a closed internal chamber; at least one partition plate, disposed in the internal chamber, to divide the internal chamber into at least one emission chamber and a collection chamber; A light source is disposed in the emission cavity and is used to emit a near-infrared spectrum to illuminate the sample to be tested; A collection device, arranged in the collection cavity, for acquiring and transmitting the optical signal generated after passing through the sample to be tested; A detection device, disposed outside the internal chamber, for receiving and analyzing optical signals to obtain spectrum information of the sample to be tested; The sample loading device is arranged at a position outside the internal chamber corresponding to the optical window, and is used for placing the sample to be tested.

[0007] Furthermore, the number of the partition plates is two, which are arranged in the internal chamber to divide the internal chamber into two emission chambers and one collection chamber; The collecting chamber is located in the middle, and the two emitting chambers are located at opposite sides of the collecting chamber.

[0008] Further, the internal chamber is an isosceles trapezoidal structure, the shell includes a first shell located at the upper part, and a second shell and a third shell located at both sides respectively, and the optical window is located at the lower part; The two partition plates are arranged in parallel and at intervals between the first shell and the optical window, dividing the internal chamber into a collection chamber with a rectangular structure and two emission chambers with a triangular structure.

[0009] Furthermore, the angle between the first shell and the optical window ranges from 10° to 80°.

[0010] Furthermore, the number of the light sources matches the number of the emission chambers, and the light sources are mounted on the housing, facing the position of the optical window.

[0011] Furthermore, the near-infrared spectrometer further comprises a heat dissipation device, which is arranged on the housing and located close to the light source.

[0012] Furthermore, the acquisition device includes a coupling lens and an optical fiber, the coupling lens is used to couple the optical signal, and the optical fiber is used to transmit the optical signal.

[0013] Further, the coupling lens and the optical fiber are of a split structure, or the coupling lens and the optical fiber are of an integrated structure; The optical fiber is installed on the housing, and one end of the optical fiber extends to the outside of the housing.

[0014] Furthermore, the optical window is made of quartz glass.

[0015] Furthermore, the near-infrared spectrometer also includes a control system, which is communicatively connected with the light source, the acquisition device and the detection device, and is used to control the switch and intensity of the light source, and control the start and stop of the acquisition device and the detection device.

[0016] Compared with the prior art, the near-infrared spectrometer provided by the embodiment of the present invention has at least the following technical effects: The internal chamber is divided into an emission chamber and a collection chamber by at least one partition plate. The light source is located in the emission chamber, and the collection device is arranged in the collection chamber. This structural design allows the near-infrared light emitted by the light source and the light generated by the sample to be tested to propagate in different chambers, thereby avoiding the interference of the light source light on the spectral signal collected by the detection device, reducing signal noise, and improving the accuracy of the spectral data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 FIG. 4 is a schematic diagram of the structure of a near-infrared spectrometer in one embodiment of the present invention.

[0019] Reference numerals: 10. Shell; 20. Optical window; 30. Partition plate; 40. Transmitting cavity; 50. Collecting cavity; 60. Light source; 71. Coupling lens; 72. Optical fiber; 80. Sample loading device; 90. Heat dissipation device. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. 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 the field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0024] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0025] Please refer to the attached Figure 1 As shown, an embodiment of the present invention provides a near-infrared spectrometer, including a housing 10, an optical window 20, at least one partition plate 30, a light source 60, a collection device, a detection device and a sample loading device 80. The optical window 20 and the housing 10 are enclosed together to form a closed internal chamber; at least one partition plate 30 is arranged in the internal chamber, dividing the internal chamber into at least one emission chamber 40 and a collection chamber 50; the light source 60 is arranged in the emission chamber 40, for emitting a near-infrared spectrum to irradiate the sample to be tested; the collection device is arranged in the collection chamber 50, for acquiring and transmitting the light signal generated after passing through the sample to be tested; the detection device is arranged outside the internal chamber, for receiving and analyzing the light signal, so as to obtain the spectral information of the sample to be tested; the sample loading device 80 is arranged outside the internal chamber at a position corresponding to the optical window 20, for placing the sample to be tested. Among them, the light source 60 can be but is not limited to a halogen lamp. The optical window 20 can transmit the near-infrared spectrum. In addition, it can effectively isolate the light source 60 and the collection device located in the internal chamber from the external environment to prevent external pollutants such as dust from entering the internal chamber.

[0026] In this embodiment, the internal chamber is divided into an emission chamber 40 and a collection chamber 50 by at least one partition plate 30, the light source 60 is located in the emission chamber 40, and the collection device is arranged in the collection chamber 50. This structural design allows the near-infrared light emitted by the light source 60 and the light generated by the sample to be tested to propagate in different chambers, thereby avoiding the interference of the light source 60 on the spectral signal collected by the detection device, reducing signal noise, and improving the accuracy of the spectral data.

[0027] In some optional embodiments, there are two partition plates 30, which are arranged in the internal chamber to divide the internal chamber into two emission chambers 40 and one collection chamber 50; the collection chamber 50 is located in the middle position, and the two emission chambers 40 are respectively located on opposite sides of the collection chamber 50. The configuration of the two emission chambers 40 ensures that the light source 60 can illuminate the sample to be tested from different angles, avoiding the problem of uneven illumination that may be caused by a single light source. This design effectively reduces the impact of differences in surface composition uniformity, particle size and flatness of the sample to be tested on the accuracy of spectral data, while enhancing the intensity of the incident light, thereby improving the stability and consistency of the spectral signal. The collection chamber 50 is located in the middle position, which helps to maximize the concentration and accurate collection of the optical signal generated after the sample to be tested, reduces the loss during the transmission of the optical signal, and improves the accuracy of the spectral data.

[0028] In some optional embodiments, the internal chamber has an isosceles trapezoidal structure, the shell 10 includes a first shell located at the top, and a second shell and a third shell located on both sides respectively, and the optical window 20 is located at the bottom; two partition plates 30 are parallel and spaced apart between the first shell and the optical window 20, dividing the internal chamber into a collection chamber 50 with a rectangular structure and two emission chambers 40 with a triangular structure.

[0029] In some optional embodiments, the angle between the first housing and the optical window 20 is in the range of 10°-80°. The light source 60 is mounted on the first housing so that the near infrared spectrum emitted by the light source 60 can be irradiated onto the sample to be tested at a suitable angle, thereby optimizing the incident effect of light.

[0030] In near-infrared spectroscopy analysis, there are many factors that affect the accuracy of spectral data, including the surface composition uniformity of the sample to be tested, the difference in particle size and flatness, the incident angle of the light source and the intensity of the light source. These factors may affect the accuracy of spectral data. Therefore, in the design process of near-infrared spectrometer, these factors must be fully considered and optimized to improve the accuracy and reliability of spectral data accuracy.

[0031] In some optional embodiments, a plurality of partition plates 30 are provided in the internal chamber to divide the chamber into a plurality of emission chambers 40 and a collection chamber 50. The number of light sources 60 matches the number of emission chambers 40, and the light source 60 is mounted on the housing 10, facing the position of the optical window 20, to ensure that the near-infrared spectrum emitted by the light source 60 passes through the optical window 20 and irradiates the sample to be tested. The configuration of the plurality of emission chambers 40 enables the plurality of light sources 60 to irradiate the sample to be tested from different angles at the same time, effectively reducing the influence of the differences in the uniformity of the sample surface composition, the particle size and the flatness on the accuracy of the spectral data, while enhancing the intensity of the incident light, thereby improving the stability and consistency of the spectral signal.

[0032] In some optional embodiments, the near infrared spectrometer further includes a heat sink 90, which is disposed on the housing 10 and is located near the light source 60. The heat sink 90 may be, but is not limited to, a heat sink fan. By disposing the heat sink 90, the heat generated by the light source 60 during operation can be effectively dissipated.

[0033] In some optional embodiments, the collection device includes a coupling lens 71 and an optical fiber 72, wherein the coupling lens 71 is used to couple the optical signal, and the optical fiber 72 is used to transmit the optical signal. Specifically, the coupling lens 71 effectively couples the optical signal generated after passing through the sample to be tested to ensure that the optical signal can smoothly enter the optical fiber 72. The optical fiber 72 is used to efficiently transmit the optical signal, and transmits the optical signal collected by the coupling lens 71 to the detection device.

[0034] In some optional embodiments, the coupling lens 71 and the optical fiber 72 are split structures, that is, they are independent components. The split structure design allows the optical fiber 72 and the coupling lens 71 to be replaced or adjusted separately, thereby providing high flexibility for maintenance and optimization. In addition, this design facilitates rapid replacement of components when a failure occurs or an upgrade is required, reducing maintenance costs and time.

[0035] In some other optional embodiments, the coupling lens 71 and the optical fiber 72 are of an integrated structure, that is, they are designed as an integral component. The integrated structure is usually more compact, can provide higher optical docking accuracy, and reduce the loss of optical signals during transmission.

[0036] In some optional embodiments, the optical fiber 72 is mounted on the housing 10, and one end thereof extends to the outside of the housing 10 to achieve connection with the detection device.

[0037] In some optional embodiments, the optical window 20 is made of quartz glass. Quartz glass has excellent light transmittance in the near-infrared band (usually 750 nm to 2500 nm), and can effectively transmit the near-infrared light emitted by the light source 60 and the light signal generated after passing through the sample to be tested, reducing the loss of the light signal. This feature ensures the intensity and clarity of the spectral signal, which is particularly important for improving the sensitivity of the spectrometer when analyzing low-concentration samples.

[0038] In some optional embodiments, the near-infrared spectrometer also includes a control system, which is communicatively connected to the light source 60, the collection device and the detection device, and is used to control the switch and intensity of the light source 60, and control the start and stop of the collection device and the detection device.

[0039] Specifically, the control system can control the switch state and light intensity of the light source 60 to ensure that the light source 60 provides stable and uniform light irradiation at the right time, and adjust the intensity of the light source 60 according to actual needs. For example, the control system can dynamically adjust the output intensity of the light source 60 according to the properties of the sample to be tested and the test conditions to avoid problems such as excessive irradiation or too weak signals. In addition, the control system is also responsible for controlling the start and stop of the acquisition device and the detection device to ensure that they are automatically started or shut down at the right time to avoid unnecessary energy consumption or equipment loss.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A near infrared spectrometer, characterized in that: include: case; An optical window, which is arranged together with the shell to form a closed internal chamber; at least one partition plate, disposed in the internal chamber, to divide the internal chamber into at least one emission chamber and a collection chamber; A light source is disposed in the emission cavity and is used to emit a near-infrared spectrum to illuminate the sample to be tested; A collection device, arranged in the collection cavity, for acquiring and transmitting the optical signal generated after passing through the sample to be tested; A detection device, disposed outside the internal chamber, for receiving and analyzing optical signals to obtain spectrum information of the sample to be tested; The sample loading device is arranged at a position outside the internal chamber corresponding to the optical window, and is used for placing the sample to be tested.

2. The near infrared spectrometer according to claim 1, characterized in that: There are two partition plates, which are arranged in the internal chamber to divide the internal chamber into two emission chambers and one collection chamber; The collecting chamber is located in the middle, and the two emitting chambers are located at opposite sides of the collecting chamber.

3. The near infrared spectrometer according to claim 2, characterized in that: The internal chamber is in an isosceles trapezoidal structure, the shell includes a first shell located at the upper part, and a second shell and a third shell located at both sides respectively, and the optical window is located at the lower part; The two partition plates are arranged in parallel and at intervals between the first shell and the optical window, dividing the internal chamber into a collection chamber with a rectangular structure and two emission chambers with a triangular structure.

4. The near infrared spectrometer according to claim 3, characterized in that: The angle between the first shell and the optical window ranges from 10° to 80°.

5. The near infrared spectrometer according to claim 1, characterized in that: The number of the light sources matches the number of the emission chambers, and the light sources are mounted on the housing, facing the position of the optical window.

6. The near infrared spectrometer according to claim 5, characterized in that: It also includes a heat dissipation device, which is arranged on the housing and located close to the light source.

7. The near infrared spectrometer according to claim 1, characterized in that: The acquisition device comprises a coupling lens and an optical fiber, wherein the coupling lens is used for coupling optical signals, and the optical fiber is used for transmitting optical signals.

8. The near infrared spectrometer according to claim 7, characterized in that: The coupling lens and the optical fiber are of a separate structure, or the coupling lens and the optical fiber are of an integrated structure; The optical fiber is installed on the housing, and one end of the optical fiber extends to the outside of the housing.

9. The near infrared spectrometer according to claim 1, characterized in that: The optical window is made of quartz glass.

10. The near infrared spectrometer according to any one of claims 1 to 9, characterized in that: It also includes a control system, which is communicatively connected with the light source, the collection device and the detection device, and is used to control the switch and intensity of the light source, and control the start and stop of the collection device and the detection device.

Images