Gas detection module and spectrograph

Abstract

The invention relates to a gas detection module and a spectrograph, the gas detection module comprises: a detection module body, the left and right sides of which are respectively provided with a gas inlet and a gas outlet; the interior of the detection module body is hollow to form a gas cavity; a detection window is arranged on the front side surface of the detection module body, the detection window is a through hole communicated with the gas cavity, and a window sheet is arranged at the detection window; the mounting base is arranged in the gas cavity and directly faces the diaphragm; a detection chip is arranged on the end face, facing the diaphragm, of the mounting base; and the laser beam is irradiated to the detection chip through the diaphragm. The gas sensor can be used for gas detection based on Raman enhancement, and is high in gas component detection sensitivity and high in specificity, so that gas detection becomes convenient and fast; and the gas detection module can be prepared and assembled on the existing portable Raman spectrometer, so that the portable Raman spectrometer realizes on-site rapid detection of solids, liquids and gases.

Description

Technical Field

[0001] The present invention relates to the field of Raman spectroscopy and gas detection technology, in particular to a gas detection module and a spectrometer, and in particular to a gas detection module and a spectrometer based on Raman enhancement. Background Art

[0002] When incident light of a certain frequency hits the surface of a sample material, scattered light will be formed. Because energy transfer occurs between the molecules in the sample material and the excitation photons, the frequency of the light will change before and after scattering. The change in frequency depends on the characteristics of the sample material. The vibration mode of the atomic groups of different sample materials is unique, so scattered light with a specific difference from the frequency of the incident light can be generated. The scattered light formed by the scattered light is called the Raman spectrum. This part of the energy change reflects the structural characteristics of the material. Scientists call the spectrum obtained by the Raman effect the "fingerprint spectrum" of the material. In other words, different substances have different Raman spectra.

[0003] Gas detection is a vital task in various application fields, involving safety monitoring, environmental protection, industrial process control, etc. Traditional gas detection methods usually rely on gas sensors, which may have complex structures, high costs, limited sensitivity and specificity, and also face the challenge that some gases are not easy to detect or are not suitable for traditional methods.

[0004] As a non-invasive spectral analysis method, Raman spectroscopy has been widely used in gas detection. Raman spectroscopy can be used to detect different substances and realize the detection of solids, liquids and gases. However, unlike the detection of solids and liquids, Raman spectrometers usually cannot directly detect gases and usually require some preparation, such as: the sample gas usually needs to interact with a suitable substrate or surface for Raman scattering; it involves adsorbing the sample gas onto the solid surface and passing the sample gas in the sample chamber to interact with the laser.

[0005] The portable Raman spectrometer in the prior art does not have the Raman gas detection function. How to design a gas detection module, how to assemble the gas detection module to the existing portable Raman spectrometer, and what method to use to inject the test sample gas for Raman gas detection so that the portable Raman spectrometer can realize on-site rapid detection of solids, liquids and gases are problems that need to be solved.

[0006] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0007] In view of the defects existing in the prior art, the object of the present invention is to provide a gas detection module and a spectrometer. The gas detection module can be used for gas detection based on Raman enhancement and can be assembled on an existing portable Raman spectrometer to enable the portable Raman spectrometer to achieve on-site rapid detection of solids, liquids and gases.

[0008] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0009] A gas detection module, characterized in that the gas detection module 100 comprises: a detection module body, with an air inlet 1 and an air outlet 2 respectively provided on the left and right sides thereof;

[0010] The interior of the detection module body is hollow to form a gas cavity 5, and the air inlet 1 and the air outlet 2 are both connected to the gas cavity 5;

[0011] A detection window is provided on the front side of the detection module body, the detection window is a through hole communicating with the gas cavity 5, and a window sheet 6 is provided at the detection window;

[0012] The mounting base is disposed in the gas cavity 5 and faces the window sheet 6;

[0013] A detection chip 7 is provided on the end surface of the mounting base facing the window piece 6;

[0014] The laser beam 10 passes through the window plate 6 and irradiates the detection chip 7 .

[0015] On the basis of the above technical solution, the detection module body is formed by buckling a front shell and a rear shell, a buckling slot 9 is provided at the buckling portion, and an O-ring 8 is provided in the buckling slot 9.

[0016] On the basis of the above technical solution, a plurality of magnetic blocks 4 are provided at equal intervals along the edge of the detection window;

[0017] The magnetic block 4 is used to absorb the housing of the portable Raman spectrometer.

[0018] On the basis of the above technical solution, a plurality of positioning posts 3 are provided at equal intervals along the edge of the detection window;

[0019] The positioning column 3 is used to snap into the housing of the portable Raman spectrometer.

[0020] On the basis of the above technical solution, the positioning column 3 protrudes from the front side of the detection module body and is pluggable along the edge of the detection window.

[0021] On the basis of the above technical solution, the number of the positioning posts 3 is the same as that of the magnetic blocks 4, and the two are arranged alternately.

[0022] On the basis of the above technical solution, a suction cup is provided at the end of the positioning column 3 .

[0023] Based on the above technical solution, the detection window is circular or elliptical.

[0024] On the basis of the above technical solution, after the laser beam 10 is converged by the lens 11, it is irradiated to the detection chip 7 through the window piece 6;

[0025] The window plate 6 is coated with an anti-reflection film, and the anti-reflection film is matched with the wavelength of the spectrometer.

[0026] A spectrometer, characterized in that the spectrometer 101 is a portable Raman spectrometer, and any one of the aforementioned gas detection modules 100 is provided at a laser detection port of the portable Raman spectrometer.

[0027] The gas detection module and spectrometer described in the present invention have the following beneficial effects:

[0028] 1. It can be used for gas detection based on Raman enhancement, with high sensitivity and specificity in detecting gas components, making gas detection convenient.

[0029] 2. It can be assembled on an existing portable Raman spectrometer, so that the portable Raman spectrometer can realize on-site rapid detection of solids, liquids and gases.

[0030] 3. It can be widely used in gas detection, especially in applications that require rapid and high sensitivity, and can solve the problem of on-site rapid detection of chemical agents, explosives, flammable and explosive and toxic chemicals.

[0031] The gas detection module and spectrometer described in the present invention promote the progress in the field of gas detection, provide a more flexible and efficient solution, can be applied to various environmental conditions, suitable for various gas detection needs, and can be widely used in different applications, including but not limited to industry, environmental monitoring, health and safety, etc. The equipment can realize the rapid detection of solid, liquid and gas of toxic and hazardous substances in complex field environments, and is used in chemical defense forces, armed police forces, emergency response, public security, customs and other units. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention has the following accompanying drawings:

[0033] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0034] Figure 1 A schematic diagram of a gas detection module according to the present invention.

[0035] Figure 2 A cross-sectional view of a gas detection module according to the present invention.

[0036] Figure 3 Schematic diagram of gas detection principle.

[0037] Figure 4 A structural diagram of a spectrometer described in the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings. The detailed description is an explanation made in conjunction with the exemplary embodiments of the present invention, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a gas detection module, comprising: a detection module body, with an air inlet 1 and an air outlet 2 respectively provided on the left and right sides thereof;

[0040] The interior of the detection module body is hollow to form a gas cavity 5, and the air inlet 1 and the air outlet 2 are both connected to the gas cavity 5;

[0041] A detection window is provided on the front side of the detection module body, the detection window is a through hole communicating with the gas cavity 5, and a window sheet 6 is provided at the detection window;

[0042] The mounting base is disposed in the gas cavity 5 and faces the window sheet 6;

[0043] A detection chip 7 is provided on the end surface of the mounting base facing the window piece 6;

[0044] The laser beam 10 passes through the window plate 6 and irradiates the detection chip 7 .

[0045] In this embodiment, the sample gas is injected or blown in through the air inlet 1, and the air outlet 2 can ensure that the sample gas fills the entire gas cavity 5 without being affected by pressure; it is not limited to entering the air inlet 1 in the form of needle injection, hose connected to gas bottle, etc.

[0046] In this embodiment, the gas detection module can be used as a detection accessory of the spectrometer and assembled to the laser detection port of any commercially available portable Raman spectrometer, further enhancing the function of the portable Raman spectrometer. The portable Raman spectrometer can realize comprehensive measurement of solids, gases and liquids.

[0047] In this embodiment, the shapes, lengths and positions of the air inlet 1 and the air inlet 2 are not limited, and are not limited to being symmetrically arranged on both sides.

[0048] Based on the above technical solution, Figure 2 As shown, the detection module body is formed by buckling a front shell and a rear shell, a buckling slot 9 is provided at the buckling portion, and an O-ring 8 is provided in the buckling slot 9.

[0049] In this embodiment, the front housing and the rear housing can be quickly disassembled by means of the snap-fitting slot 9 ; the snap-fitting slot 9 and the O-ring 8 cooperate to ensure the airtightness of the gas chamber 5 .

[0050] The structure of the buckle-fitting slot 9 is not limited to buckles, magnets, threads, quick clips or other forms of fastening two parts together to prevent air leakage.

[0051] On the basis of the above technical solution, a plurality of magnetic blocks 4 are provided at equal intervals along the edge of the detection window;

[0052] The magnetic blocks 4 are used to absorb the housing of the portable Raman spectrometer. In this embodiment, all the magnetic blocks 4 form a magnetic interface, which is convenient for quickly installing the gas detection module on the spectrometer or quickly removing the gas detection module from the spectrometer.

[0053] On the basis of the above technical solution, a plurality of positioning posts 3 are provided at equal intervals along the edge of the detection window;

[0054] The positioning column 3 is used to snap into the housing of the portable Raman spectrometer.

[0055] The positioning post 3 protrudes from the front side of the detection module body and is pluggable and arranged along the edge of the detection window.

[0056] In this embodiment, the positioning column 3 is used to cooperate with the magnetic block 4 to more accurately align the optical axis of the gas detection module and the spectrometer, and fix them more firmly to prevent slipping.

[0057] On the basis of the above technical solution, the number of the positioning posts 3 is the same as that of the magnetic blocks 4, and the two are arranged alternately.

[0058] Exemplarily, the number of the positioning posts 3 and the number of the magnetic blocks 4 are both four.

[0059] On the basis of the above technical solution, a suction cup is provided at the end of the positioning column 3 .

[0060] The housing of the portable Raman spectrometer is adsorbed by the suction cup, so that the positioning column 3 is clamped on the housing of the portable Raman spectrometer.

[0061] Based on the above technical solution, the detection window is circular or elliptical.

[0062] On the basis of the above technical solution, after the laser beam 10 is converged by the lens 11, it is irradiated to the detection chip 7 through the window piece 6;

[0063] The window plate 6 is coated with an anti-reflection film, and the anti-reflection film is matched with the wavelength of the spectrometer.

[0064] The anti-reflection film is used to reduce the intensity loss of the laser beam 10 when it reaches the sample gas. The setting of the window piece 6 also ensures that the gas cavity 5 is airtight and leak-proof; the shapes of the detection window and the window piece 6 are too small and are not limited.

[0065] like Figure 4 As shown, the present invention provides a spectrometer, wherein the spectrometer 101 is particularly a portable Raman spectrometer, and a gas detection module 100 is provided at a laser detection port of the portable Raman spectrometer.

[0066] In this embodiment, the gas detection process of the portable Raman spectrometer is as follows:

[0067] The sample gas is injected or blown into the gas chamber 5 through the gas inlet 1 until the sample gas fills the entire gas chamber 5;

[0068] Once the sample gas contacts the detection chip 7, it will be adsorbed onto the detection chip 7 until it is fully adsorbed;

[0069] The portable Raman spectrometer is started, and the laser beam 10 is converged by the lens 11 and irradiated from the detection window to the detection chip 7 to realize Raman detection of the gas.

[0070] In this embodiment, the portable Raman spectrometer is an advanced technology for detecting gas, which combines micro-nano technology and Raman spectroscopy principles to make gas detection more sensitive and convenient.

[0071] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0072] The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment. Any equivalent modifications or changes made by those skilled in the art based on the contents disclosed by the present invention should be included in the protection scope recorded in the claims.

Claims

1. A gas detection module, characterized in that: The gas detection module (100) comprises: a detection module body, with an air inlet (1) and an air outlet (2) respectively provided on the left and right sides of the detection module body; The interior of the detection module body is hollow to form a gas cavity (5), and the gas inlet (1) and the gas outlet (2) are both in communication with the gas cavity (5); A detection window is provided on the front side of the detection module body, the detection window being a through hole communicating with the gas cavity (5), and a window piece (6) is provided at the detection window; The mounting base is arranged in the gas cavity (5) and faces the window piece (6); A detection chip (7) is provided on the end surface of the mounting base facing the window piece (6); The laser beam (10) passes through the window (6) and irradiates the detection chip (7).

2. A gas detection module according to claim 1, characterized in that: The detection module body is formed by buckling a front shell and a rear shell, a buckling slot (9) is provided at the buckling portion, and an O-ring (8) is provided in the buckling slot (9).

3. A gas detection module according to claim 1, characterized in that: A plurality of magnetic blocks (4) are provided at equal intervals along the edge of the detection window; The magnetic attraction block (4) is used for adsorbing the housing of the portable Raman spectrometer.

4. A gas detection module according to claim 3, characterized in that: A plurality of positioning posts (3) are provided at equal intervals along the edge of the detection window; The positioning column (3) is used for snapping onto the housing of the portable Raman spectrometer.

5. A gas detection module according to claim 4, characterized in that: The positioning column (3) protrudes from the front side of the detection module body and is arranged to be pluggable along the edge of the detection window.

6. A gas detection module according to claim 4, characterized in that: The number of the positioning posts (3) is the same as that of the magnetic blocks (4), and the two are arranged in an alternating manner.

7. A gas detection module according to claim 4, characterized in that: A suction cup is provided at the end of the positioning column (3).

8. A gas detection module according to claim 1, characterized in that: The detection window is circular or elliptical.

9. A gas detection module according to claim 1, characterized in that: After the laser beam (10) is converged by the lens (11), it passes through the window (6) and irradiates the detection chip (7); The window (6) is coated with an anti-reflection film, and the anti-reflection film matches the wavelength of the spectrometer.

10. A spectrometer, characterized in that: The spectrometer (101) is a portable Raman spectrometer, and the gas detection module (100) according to any one of claims 2 to 9 is provided at a laser detection port of the portable Raman spectrometer.

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