Component detection system based on Raman spectrum technology

Abstract

The utility model relates to a Raman spectrum technology, and particularly discloses a component detection system based on the Raman spectrum technology, the component detection system comprises a laser, a Raman probe, a sample accommodating structure, a spectrograph and a shading shell, the laser, the Raman probe, the sample accommodating structure and the spectrograph are respectively arranged in the shading shell, the Raman probe is in optical signal connection with the laser device and the spectrograph, and the laser device, the Raman probe and the sample containing structure are sequentially arranged along a preset laser emitting path. The laser, the Raman probe, the sample accommodating structure and the spectrometer are arranged in the shading shell, so that the influence of natural light and ambient light on a measurement result can be avoided as much as possible.

Description

A component detection system based on Raman spectroscopy technology Technical Field

[0001] This application relates to Raman spectroscopy technology, and more particularly to a component detection system based on Raman spectroscopy technology. Background Technology

[0002] Raman spectroscopy is a type of scattering spectroscopy. Based on the Raman scattering effect discovered by Indian scientist CV Raman, Raman spectroscopy analyzes the scattered spectra with frequencies different from the incident light to obtain information about molecular vibrations and rotations, and is applied to molecular structure research.

[0003] Raman spectroscopy has long been widely used in agriculture, biology, chemistry, geology, food safety, colorimetry, environmental monitoring, medicine, LED testing, semiconductor industry, and petrochemicals. Regardless of whether the sample is solid, liquid, gas, colloid, ointment, or powder, Raman spectroscopy can be used to rapidly characterize its chemical composition and structure. For example, Raman spectroscopy is commonly used for detecting food safety indicators in edible oils such as mycotoxins, pesticide residues, acid value, and peroxide value; detecting fatty acids in edible oils; and identifying adulteration and origin of high-end edible oils. This effectively avoids the dangers associated with contact with highly corrosive, toxic, flammable, and explosive chemicals that can occur with complex chemical analytical methods.

[0004] In existing technologies, component detection systems based on Raman spectroscopy typically include components such as a spectrometer, laser, industrial computer, and Raman probe. The Raman probe is located outside the overall system structure (i.e., exposed outside the overall system structure). In order to avoid the influence of natural light and ambient light on the measurement results and to avoid measurement errors, the detection operation is generally required in a dark room or a simulated dark room with light shading. However, the detection operation in a dark room or a simulated dark room with light shading is inconvenient due to poor lighting conditions.

[0005] For example, existing technology discloses an online detection system for refinery acid gas components based on Raman spectroscopy. This system includes the following components: an acid gas pipeline, a laser, an excitation fiber, a Raman probe, a sample cell, a collection fiber, a fiber optic spectrometer, an industrial control computer, a sampling valve, a flow meter, and a return valve. Refinery acid gas enters the sample cell through the acid gas pipeline via the sampling valve and flow meter, and then flows back to the acid gas pipeline via the return valve. The laser light generated by the laser is directed into the sample cell through the excitation fiber and the Raman probe. The Raman scattered light generated by the sample in the sample cell under laser irradiation is received by the Raman probe, transmitted back to the fiber optic spectrometer via the collection fiber, detected by the CCD array within the fiber optic spectrometer, and simultaneously converted into a digital signal transmitted to the industrial control computer. The industrial control computer processes and analyzes the Raman signal returned by the fiber optic spectrometer. In this existing technology, both the laser and the Raman probe are exposed, and there is also the problem that natural light and ambient light can affect the measurement results.

[0006] Existing technology also discloses an enhanced test strip detection device based on Raman detection, including a housing with a detection optical path extending through both ends inside the housing, and a test strip slot for connecting the detection optical path at the side end. This device can effectively connect with a Raman probe, providing a darkroom environment for test strip detection, thus enabling convenient and accurate sample results from Raman detection. In use, one end of the housing is connected to the probe of the Raman spectrometer, ensuring that the light path of the Raman spectrometer can pass through the detection optical path. Then, the test strip is dipped in the sample and inserted into the detection optical path through the test strip slot for normal detection. Throughout the process, the housing provides a darkroom environment for test strip detection, enabling convenient and accurate sample results from Raman detection. However, in this prior art, the Raman probe is also exposed. Although a specially designed housing provides a darkroom environment for test strip detection, there are still some issues with the device being affected by natural and ambient light outside the housing, and the operation is not very convenient. Summary of the Invention

[0007] To address the aforementioned issues, this application provides a component detection system based on Raman spectroscopy, which avoids the influence of natural light and ambient light on the measurement results and is easy to operate.

[0008] This application provides a component detection system based on Raman spectroscopy, which adopts the following technical solution:

[0009] A component detection system based on Raman spectroscopy includes a laser, a Raman probe, a sample containing structure, a spectrometer, and a light-shielding housing. The laser, Raman probe, sample containing structure, and spectrometer are respectively housed within the light-shielding housing. The Raman probe is connected to the laser and the spectrometer for optical signals. The laser, Raman probe, and sample containing structure are arranged sequentially along a preset laser emission path.

[0010] By adopting the above technical solution and setting up the aforementioned light-shielding shell to provide a darkroom environment, while simultaneously housing the laser, Raman probe, sample containment structure, and spectrometer within the light-shielding shell, the influence of natural light and ambient light on the measurement results can be minimized. This eliminates the need for a simulated darkroom indoors or for operation within a darkroom, and also avoids the inconvenience caused by poor lighting in a darkroom. Furthermore, the component detection system based on Raman spectroscopy described above offers convenient operation.

[0011] Preferably, the light-shielding shell is a hollow structure with an opening, and the opening is provided with an openable and closable cover, with the sample containing structure located close to the opening.

[0012] By adopting the above technical solution, as a specific structural example, the light-shielding shell is a hollow structure with an opening. The opening is provided with an openable and closable cover, which enables the light-shielding shell to be opened and closed. The sample-containing structure is close to the opening, which facilitates the placement and removal of samples.

[0013] Preferably, the light-shielding housing includes an upper housing and a lower housing, the upper housing and the lower housing are connected to form a hollow structure of the light-shielding housing, the outer surface of the upper housing is recessed towards the lower housing to form a receiving groove, and the groove opening forms the opening.

[0014] By adopting the above technical solution as a specific structural example, a light-shielding shell with a hollow structure is formed by connecting the upper shell and the lower shell. The above-mentioned receiving groove is provided, and the sample receiving structure can be accommodated in the receiving groove. The sample can be put in and taken out by opening and closing the cover.

[0015] Preferably, the sample receiving structure includes a support and a light-transmitting container. The support is disposed in the receiving groove, the light-transmitting container is disposed on the support, and the Raman probe is fixed on the upper housing. The light-transmitting container is correspondingly disposed to the Raman probe.

[0016] By adopting the above technical solution as a structural example, the sample receiving structure includes a support and a light-transmitting container. The light-transmitting container is used to store the sample, and the support is used to support the light-transmitting container. The Raman probe is fixed to the upper housing. In this case, the Raman probe and the light-transmitting container can be aligned and aligned according to the positions of the Raman probe and the support, achieving a corresponding setting between the light-transmitting container and the Raman probe. This facilitates the laser light generated by the laser to pass through the Raman probe into the light-transmitting container, structurally ensuring the consistency of the measurement position and distance.

[0017] Preferably, the support member includes a first support member and a second support member. The outer surface of the second support member is recessed towards the lower housing and forms a first groove structure that matches the light-transmitting container. The outer surface of the first support member is recessed towards the lower housing and forms a second groove structure that matches the second support member. The first support member is disposed in the receiving groove, the second support member is disposed in the first support member, and the light-transmitting container is disposed on the second support member.

[0018] By adopting the above technical solution as a structural example, the design of the first and second carriers allows the first carrier, the second carrier, and the Raman probe to cooperate with each other, ensuring that the light-transmitting container can always be kept in the same position when placed for measurement, so as to ensure that the relative position of the light-transmitting container and the Raman probe remains constant during each measurement, thereby ensuring the stability of the measurement results.

[0019] Preferably, it also includes a substrate, on which the spectrometer and the laser are respectively disposed, and the substrate is fixed to the bottom wall of the light-shielding shell.

[0020] By adopting the above technical solution as a structural example, a substrate can be designed in which both the spectrometer and the laser are mounted, and then fixed to the bottom wall of the light-shielding shell through the substrate. This has the advantages of simple structure and reasonable setup.

[0021] Preferably, it also includes a driving component, which is fixed on the inner wall of the light-shielding housing and is electrically connected to the laser, Raman probe and spectrometer respectively.

[0022] By adopting the above technical solution, as a structural example, a driving component is added. The driving component is located inside the light-shielding housing. For example, it can be fixed to the inner wall of the light-shielding housing by means of connecting parts such as fixing plates. The driving component is used to provide power to the laser, Raman probe, and spectrometer.

[0023] Preferably, the instrument also includes a controller, which is electrically connected to the spectrometer, and the spectrometer is a cooled CCD spectrometer.

[0024] By adopting the above technical solution as a structural example, a controller is added. After the spectrometer receives the Raman scattered light signal collected by the Raman probe, the spectrometer converts the signal into a digital signal and transmits it to the controller. The controller can run control software to process and analyze the signal returned by the spectrometer.

[0025] Preferably, the system also includes a printer, which is electrically connected to the controller.

[0026] By adopting the above technical solution as a structural example, by adding a printer, the results of controller processing and analysis can be printed.

[0027] Preferably, the component detection system based on Raman spectroscopy is an edible oil component detection system.

[0028] By adopting the above technical solution, as a structural example, the component detection system based on Raman spectroscopy technology of this application is an edible oil component detection system, that is, it is applied to the detection of edible oil components.

[0029] In summary, this application has at least the following beneficial effects:

[0030] (1) The component detection system based on Raman spectroscopy technology of this application integrates the laser, Raman probe, sample holding structure and spectrometer into a light-shielding shell, which can minimize the influence of natural light and ambient light on the measurement results. It eliminates the need for indoor light-shielding simulation darkroom or operation in a darkroom, and also avoids the inconvenience caused by poor lighting in a darkroom. At the same time, the detection operation of the system is more convenient.

[0031] (2) The component detection system based on Raman spectroscopy technology of this application is designed with a sample holding structure including a first support, a second support and a light-transmitting container, which can make the first support, the second support and the Raman probe cooperate with each other to ensure that the light-transmitting container can always be kept in the same position when placed for measurement, so as to ensure that the relative position of the light-transmitting container and the Raman probe remains constant during each measurement, so as to ensure the stability of the measurement results. Attached Figure Description

[0032] Figure 1 is a structural breakdown diagram of the component detection system based on Raman spectroscopy technology according to an embodiment of this application;

[0033] Figure 2 is a schematic diagram of the overall structure of the component detection system based on Raman spectroscopy technology according to an embodiment of this application;

[0034] Figure 3 is a cross-sectional view of BB in Figure 2.

[0035] Label Explanation:

[0036] 11. Upper shell; 12. Lower shell; 13. Cover; 14. Base;

[0037] 2. Laser; 3. Raman probe;

[0038] 41. First support component; 42. Second support component; 43. Light-transmitting container;

[0039] 5. Spectrometer; 6. Drive unit; 7. Controller; 8. Printer. Detailed Implementation

[0040] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0041] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0042] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0043] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] Definition of words:

[0045] CCD Spectrometer: A CCD spectrometer (Charge-Coupled Device Spectrometer) is a commonly used spectral measurement instrument based on the working principle of a charge-coupled device (CCD).

[0046] Example 1

[0047] The embodiment shown in this example is illustrated in Figures 1-3, where the same reference numerals denote corresponding components throughout the views. It should be understood that the component detection system based on Raman spectroscopy according to this embodiment can be used in fields such as agriculture, biology, chemistry, geology, food safety, colorimetry calculation, environmental monitoring, medicine and health, LED testing, semiconductor industry, and petrochemicals for component detection of samples such as solids, liquids, gases, colloids, ointments, or powders.

[0048] As shown in Figure 1, the component detection system based on Raman spectroscopy in this embodiment is applied to the detection of edible oils. It includes: a laser 2, a Raman probe 3, a sample containing structure, a spectrometer 5, a light-shielding housing, a substrate 14, a driver 6, a controller 7, and a printer 8. In this embodiment, a cooled CCD spectrometer is used, a commonly used industrial computer is selected for the controller 7, a common power supply is used for the driver 6, and common models and functions are selected for the printer 8, laser 2, and Raman probe 3.

[0049] The light-shielding housing includes an upper housing 11 and a lower housing 12. The upper housing 11 has an inverted U-shaped structure, and the lower housing 12 has a U-shaped structure. The inverted U-shaped upper housing 11 and the U-shaped lower housing 12 are offset at 90° and connected to form a hollow light-shielding housing. The surface of the upper housing 11 located at the corner of its inverted U-shape is recessed towards the lower housing (i.e., downward in the figure) to form a receiving groove. The opening of the receiving groove forms an opening. A cover 14 that can be opened and closed is provided at the opening.

[0050] Laser 2, Raman probe 3, sample containment structure, and spectrometer 5 are each independently housed within a light-shielding housing. Spectrometer 5 and laser 2 are respectively mounted on substrate 14, which is fixed to the bottom wall of lower housing 12. Raman probe 3 is connected to the optical signals of laser 2 and spectrometer 5, respectively. Laser 2, Raman probe 5, and sample containment structure are sequentially arranged along a preset laser emission path.

[0051] The drive unit 6 is fixed to the inner wall of the lower housing 12 and is electrically connected to the laser 2, Raman probe 3, spectrometer 5, and printer 8. The controller 7 is mounted on the upper surface of the upper housing 11 via a mounting panel and is electrically connected to the spectrometer 5, drive unit 6, and printer 8.

[0052] The sample receiving structure includes a first support member 41, a second support member 42, and a light-transmitting container 43. The outer surface of the second support member 42 is recessed towards the lower housing (i.e., downward direction in the diagram) to form a first groove structure that matches the light-transmitting container 43. The outer surface of the first support member 41 is recessed towards the lower housing (i.e., downward direction in the diagram) to form a second groove structure that matches the second support member 42. The first support member 41 is disposed in the receiving groove, the second support member 42 is disposed in the first support member, and the light-transmitting container 43 is disposed on the second support member. The Raman probe 3 is fixed to the inner wall of the upper housing 11. Through the mutual cooperation of the first support member 41, the second support member 42, and the Raman probe 3, the light-transmitting container 43 is correspondingly positioned with the Raman probe 3. In this embodiment, the light-transmitting container is a cuvette.

[0053] Based on the above structural description, the working principle of the component detection system based on Raman spectroscopy in this embodiment is as follows:

[0054] Referring to Figures 2 and 3, open the cover and place the light-transmitting container 43 containing the sample to be tested (edible oil in this embodiment) into the second support member 42. Due to the prior adjustment of the positions between the first support member 41, the second support member 42, and the Raman probe 3, the relative position of the light-transmitting container 43 with the Raman probe 3 can remain constant during measurement to ensure the stability of the measurement results.

[0055] At this time, the drive unit 6 is turned on, and the controller 7 controls the laser 2 to emit laser light of the required wavelength. The emitted laser light is emitted along the preset laser emission path and enters the light-transmitting container 43 through the Raman probe 3. The Raman scattered light generated by the sample in the light-transmitting container 43 under laser irradiation is received by the Raman probe 3, and then the light of the required wavelength is collected by the Raman probe 3 and transmitted back to the spectrometer 5. It is detected by the CCD array in the spectrometer 5 and converted into a digital signal and transmitted to the controller 7. The controller 7 runs its software to process and analyze the Raman signal returned by the spectrometer 5, completes the measurement, and then the controller 7 controls the printer 8 to print the measurement result.

[0056] This embodiment has the following advantages:

[0057] (1) The above-mentioned light-shielding shell is set up to provide a dark room environment. At the same time, the laser 2, Raman probe 3, sample holding structure and spectrometer 5 are all built into the light-shielding shell. This can minimize the impact of natural light and ambient light on the measurement results. There is no need to simulate a dark room indoors or operate in a dark room. It also avoids the inconvenience of operation caused by poor lighting in a dark room.

[0058] (2) The overall system testing operation is relatively convenient;

[0059] (3) The first carrier 41, the second carrier 42, and the Raman probe 3 cooperate with each other to ensure that the light-transmitting container 43 can always be kept in the same position when it is placed for measurement, so as to ensure that the relative position of the light-transmitting container 43 and the Raman probe 3 remains constant during each measurement, thus ensuring the stability of the measurement results.

[0060] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A composition detection system based on Raman spectroscopy, characterized by, The device includes a laser, a Raman probe, a sample containing structure, a spectrometer, and a light-shielding housing. The laser, Raman probe, sample containing structure, and spectrometer are respectively housed within the light-shielding housing. The Raman probe is connected to the laser and the spectrometer for optical signals. The laser, Raman probe, and sample containing structure are arranged sequentially along a preset laser emission path.

2. The Raman spectroscopy based composition detection system of claim 1, wherein, The light-shielding shell is a hollow structure with an opening, and the opening is provided with an openable and closable cover. The sample-containing structure is located close to the opening.

3. The Raman spectroscopy based composition detection system of claim 2, wherein, The light-shielding housing includes an upper housing and a lower housing. The upper housing is connected to the lower housing to form a hollow structure. The outer surface of the upper housing is recessed towards the lower housing to form a receiving groove, and the groove opening forms the opening.

4. The Raman spectroscopy based composition detection system of claim 3, wherein, The sample receiving structure includes a support and a light-transmitting container. The support is disposed in the receiving groove, the light-transmitting container is disposed on the support, and the Raman probe is fixed on the upper housing. The light-transmitting container is correspondingly arranged with the Raman probe.

5. The Raman spectroscopy based composition detection system of claim 4, wherein, The support includes a first support and a second support. The outer surface of the second support is recessed towards the lower housing and forms a first groove structure that matches the light-transmitting container. The outer surface of the first support is recessed towards the lower housing and forms a second groove structure that matches the second support. The first support is disposed in the receiving groove, the second support is disposed in the first support, and the light-transmitting container is disposed on the second support.

6. The Raman spectroscopy based composition detection system of claim 1, wherein, It also includes a substrate, on which the spectrometer and laser are respectively mounted, and the substrate is fixed to the bottom wall of the light-shielding shell.

7. The component detection system based on Raman spectroscopy according to claim 1, characterized in that, It also includes a driving component, which is fixed on the inner wall of the light-shielding housing and is electrically connected to the laser, Raman probe and spectrometer respectively.

8. The component detection system based on Raman spectroscopy according to claim 1, characterized in that, It also includes a controller, which is electrically connected to the spectrometer, which is a cooled CCD spectrometer.

9. The Raman spectroscopy based composition detection system of claim 8, wherein, It also includes a printer, which is electrically connected to the controller.

10. The Raman spectroscopy based composition detection system of claim 9, wherein, The component detection system based on Raman spectroscopy is an edible oil component detection system.

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