Mid-infrared and near-infrared same-cavity gas detection device

Abstract

The utility model belongs to the technical field of gas detection, and particularly relates to a mid-infrared and near-infrared same-cavity gas detection device which comprises a cavity, a near-infrared emission mechanism, a mid-infrared emission mechanism and a micro-sound mechanism. The cavity is provided with a first detection channel and a second detection channel; the near-infrared emission mechanism is used for emitting near-infrared light, and the near-infrared light is emitted into the first detection channel; the mid-infrared emission mechanism is used for emitting mid-infrared light, and the mid-infrared light can enter the second detection channel; the micro-sound mechanism is arranged in the cavity and used for collecting sound in the first detection channel and the second detection channel, mid-infrared detection and near-infrared detection can be achieved in one detection cavity at the same time, and the amount of gas needed by detection of the mid-infrared and near-infrared same-cavity gas detection device can be reduced. The detection condition that the amount of gas generated by a transformer fault is small can be met, and the detection accuracy is also improved.

Description

Technical Field

[0001] The present application belongs to the field of gas detection technology, and in particular relates to a mid-infrared and near-infrared same-cavity gas detection device. Background Art

[0002] Transformer failure usually produces gas. By checking the type and concentration of the gas, the operating status of the transformer can be detected. The gas produced by the transformer dissolves in the transformer oil, and it is difficult to directly measure the type and concentration of the gas in the oil. Therefore, degassing is required to remove the gas from the oil before detection. However, in actual testing, the amount of gas produced by transformer failure is small, and the amount of gas obtained by degassing is also small, which makes it difficult to meet the gas detection needs.

[0003] The above statements are only used to provide background information related to the present application and do not necessarily constitute prior art. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a mid-infrared and near-infrared same-cavity gas detection device, including but not limited to solving the problem in the related art that the amount of gas generated by transformer failure is small, the amount of gas obtained by degassing is small, and it is difficult to meet the gas detection needs.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a mid-infrared and near-infrared gas detection device in the same cavity, comprising a cavity, a near-infrared emitting mechanism, a mid-infrared emitting mechanism and a micro-sound mechanism: the cavity has a detection cavity and a first channel and a second channel connected to the detection cavity, one of the first channel and the second channel is used for allowing gas to flow into the detection cavity, and the other is used for allowing gas to flow out of the detection cavity; the detection cavity includes a first buffer cavity, a second buffer cavity, a first detection channel and a second detection channel, the first detection channel is connected between the first buffer cavity and the second buffer cavity, the second detection channel is connected between the first buffer cavity and the second buffer cavity, and the first detection channel and the second detection channel are parallel and spaced apart; the cavity has a first opening and a second opening connected to the first buffer cavity A second opening connected to the second buffer cavity, the first opening is located on the side of the first buffer cavity facing away from the second buffer cavity, and the second opening is located on the side of the second buffer cavity facing away from the first buffer cavity; the first channel is connected to the first buffer cavity, and the second buffer cavity is connected to the second channel; a near-infrared emitting mechanism is provided at the end of the cavity close to the first opening, and the near-infrared emitting mechanism is used to emit near-infrared light, and the near-infrared light can be emitted into the first detection channel through the first opening and the first buffer cavity; a mid-infrared emitting mechanism is provided at the end of the cavity close to the second opening, and the mid-infrared emitting mechanism is used to emit mid-infrared light, and the mid-infrared light can be emitted into the second detection channel through the second opening and the second buffer cavity; a micro-sound mechanism is provided in the cavity, and the micro-sound mechanism is used to collect sounds in the first detection channel and the second detection channel.

[0006] Optionally, the micro-phone mechanism includes a first micro-phone and a second micro-phone, the first micro-phone is installed in the first detection channel, and the second micro-phone is installed in the second detection channel.

[0007] Optionally, the first microphone is located at an antinode of the sound wave in the first detection channel; and / or the second microphone is located at an antinode of the sound wave in the second detection channel.

[0008] Optionally, the detection cavity is a resonant cavity.

[0009] Optionally, a cavity wall of the first buffer cavity opposite to the first opening is provided with a third opening communicating with the first channel; and / or a cavity wall of the second buffer cavity opposite to the second opening is provided with a fourth opening communicating with the second channel.

[0010] Optionally, the near-infrared emitting mechanism includes a near-infrared laser, a first collimating lens and a first dichroic mirror, the near-infrared laser is used to emit near-infrared light, the first collimating lens, the first dichroic mirror and the first buffer cavity are arranged in sequence along the optical path of the near-infrared light; the first dichroic mirror is arranged opposite to the first detection channel and the second detection channel, and the first dichroic mirror is used to allow near-infrared light to pass through and can reflect mid-infrared light.

[0011] Optionally, the mid-infrared emitting mechanism includes a mid-infrared laser, a second collimating lens and a second dichroic mirror, the mid-infrared laser is used to emit mid-infrared light, the second collimating lens, the second dichroic mirror and the second buffer cavity are arranged in sequence along the optical path of the mid-infrared light; the second dichroic mirror is installed at the second opening, the second dichroic mirror is arranged opposite to the first detection channel and the second detection channel, the second dichroic mirror is used to allow the mid-infrared light to pass through and can reflect near-infrared light.

[0012] Optionally, the mid-infrared emitting mechanism further includes a reflector, which is disposed between the back of the second dichroic mirror and the second collimating lens to change the propagation direction of the mid-infrared light emitted through the second collimating lens.

[0013] Optionally, the wavelength range of the mid-infrared light is 2980 nm to 3026 nm; and / or the wavelength range of the near-infrared light is 1500 nm to 1532 nm.

[0014] Optionally, the cavity is a stainless steel cavity.

[0015] The above one or more technical solutions in the mid-infrared and near-infrared gas detection device in the same cavity provided by the present invention have at least one of the following technical effects: a first detection channel and a second detection channel are simultaneously provided in the cavity, and mid-infrared detection and near-infrared detection can be simultaneously realized in one detection cavity, which can reduce the amount of gas required for detection by the mid-infrared and near-infrared gas detection device in the same cavity, can meet the detection condition of a small amount of gas generated by a transformer fault, and also improves the accuracy of detection; the mid-infrared and near-infrared gas detection device in the same cavity can perform mid-infrared detection and near-infrared detection on the gas in the same cavity. On the one hand, it meets the same test environment and can reduce detection errors. On the other hand, by utilizing mid-infrared and near-infrared gas detection in the same cavity, the results of the two can be cross-verified to avoid false alarms or erroneous alarms of the transformer.

[0016] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 A cross-sectional view of a mid-infrared and near-infrared same-cavity gas detection device provided in some embodiments of the present application.

[0019] Figure 2 A cross-sectional view of a cavity provided in some embodiments of the present application.

[0020] Among them, the reference numerals in the figures are:

[0021] 100. Mid-infrared and near-infrared gas detection device in the same cavity; 10. Cavity; 11. Detection cavity; 111. First buffer cavity; 1111. Third opening; 112. Second buffer cavity; 1121. Fourth opening; 113. First detection channel; 114. Second detection channel; 115. First opening; 116. Second opening; 12. First channel; 121. First section; 122. Second section; 13. Second channel; 131. Third section; 132. Fourth section; 20. Near-infrared emitting mechanism; 201. Near-infrared light; 21. Near-infrared laser; 22. First collimating lens; 23. First dichroic mirror; 30. Mid-infrared emitting mechanism; 301. Mid-infrared light; 31. Mid-infrared laser; 32. Second collimating lens; 33. Second dichroic mirror; 34. Reflector; 40. Microphone mechanism; 41. First microphone; 42. Second microphone. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0024] In the description of the embodiments of this application, the technical terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Therefore, a feature designated "first" or "second" may explicitly or implicitly include one or more of such features.

[0025] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0026] In the description of the embodiments of this application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more (including two groups), and "multiple sheets" refers to two or more (including two sheets). "Several" means one or more, unless otherwise specifically defined.

[0027] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0028] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0029] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, when an element is referred to as being “fixed to” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0030] Common transformer faults, such as partial discharge and transformer overheating, often produce a variety of fault-signaling gases. The type and concentration of these gases are closely related to the presence and type of fault, making them crucial monitoring targets for transformer fault early warning. Oil-immersed transformers, in particular, are susceptible to aging and deterioration of the oil and paper insulation due to these faults, producing a variety of fault-signaling gases, including hydrogen (H2), methane (CH4), acetylene (C2H2), ethylene (C2H4), ethane (C2H6), carbon monoxide (CO), and carbon dioxide (CO2). Unlike other types of transformers, most fault-signaling gases produced by oil-immersed transformers are directly dissolved in the transformer oil, making detection more challenging. Degassing removes dissolved gases from the oil and then measures the type and concentration of these gases to determine if a transformer fault has occurred. Detection can detect one or more of these fault-signaling gases, with the specific gas selected based on actual needs.

[0031] The main gas detection methods are chromatography and photoacoustic spectroscopy. Chromatography is a standard laboratory method used for on-site online monitoring, but it has issues such as consumables and maintenance requirements. However, chromatography also has drawbacks in real-time online monitoring systems. Photoacoustic spectroscopy, on the other hand, is increasingly recognized due to its advantages such as the lack of consumables and ease of calibration.

[0032] An embodiment of the present application provides a mid-infrared and near-infrared gas detection device in the same cavity. A first detection channel and a second detection channel are provided in the cavity, which can realize simultaneous mid-infrared detection and near-infrared detection in one detection cavity. Compared with the method of realizing two detections in two detection cavities, the amount of gas required to realize two detections in the same detection cavity is smaller; in addition, when the near-infrared and mid-infrared measure the same gas, correction is made according to the different absorption coefficients of near-infrared light and near-infrared light for fault characteristic gas, which can reduce errors, correct the influence of drift of near-infrared emission mechanism and mid-infrared emission mechanism, and improve the stability of the mid-infrared and near-infrared gas detection device in the same cavity.

[0033] The following combination Figure 1 and Figure 2 The mid-infrared and near-infrared gas detection device 100 in the same cavity according to an embodiment of the present application is described.

[0034] In some embodiments, a mid-infrared and near-infrared gas detection device 100 in the same cavity includes a cavity 10, a near-infrared emission mechanism 20, a mid-infrared emission mechanism 30 and a micro-sound mechanism 40; the cavity 10 has a detection cavity 11 and a first channel 12 and a second channel 13 connected to the detection cavity 11, one of the first channel 12 and the second channel 13 is used to allow gas to flow into the detection cavity 11, and the other is used to guide gas to flow out of the detection cavity 11; the detection cavity 11 includes a first buffer cavity 111, a second buffer cavity 112, a first detection channel 113 and a second detection channel 114, the first detection channel 113 is connected between the first buffer cavity 111 and the second buffer cavity 112, and the first detection channel 113 and the second detection channel 114 are parallel and spaced apart; the cavity 10 has a first opening 115 connected to the first buffer cavity 111 and a second opening 116 connected to the second buffer cavity 112 16. The first opening 115 is located on the side of the first buffer cavity 111 facing away from the second buffer cavity 112, and the second opening 116 is located on the side of the second buffer cavity 112 facing away from the first buffer cavity 111; the first channel 12 is connected to the first buffer cavity 111, and the second buffer cavity 112 is connected to the second channel 13; the near-infrared emitting mechanism 20 is provided at the end of the cavity 10 near the first opening 115, and the near-infrared emitting mechanism 20 is used to emit near-infrared light 201, and the near-infrared light 201 can be injected into the first detection channel 113 through the first opening 115 and the first buffer cavity 111; the mid-infrared emitting mechanism 30 is provided at the end of the cavity 10 near the second opening 116, and the mid-infrared emitting mechanism 30 is used to emit mid-infrared light 301, and the mid-infrared light 301 can be injected into the second detection channel 114 through the second opening 116 and the second buffer cavity 112; the micro-sound mechanism 40 is provided in the cavity 10, and the micro-sound mechanism 40 is used to collect sound in the first detection channel 113 and the second detection channel 114.

[0035] The cavity 10 may refer to a component having a cavity therein. The cavity 10 is used to enclose and form the detection cavity 11 , the first channel 12 and the second channel 13 . The cavity 10 may be made of metal material.

[0036] The detection cavity 11 may refer to an internal space for introducing gas to perform mid-infrared detection and near-infrared detection; when mid-infrared and near-infrared light enter the detection cavity 11 , a photoacoustic effect occurs in the detection cavity 11 .

[0037] The first channel 12 and the second channel 13 may refer to channels used to connect the detection chamber 11 and the outside of the cavity 10. The first channel 12 may be an air inlet channel and the second channel 13 may be an air outlet channel. The gas enters the detection chamber 11 from the first channel 12. After the detection is completed, the gas flows out of the detection chamber 11 from the second channel 13. Alternatively, the first channel 12 may be an air outlet channel and the second channel 13 may be an air inlet channel. The gas enters the detection chamber 11 from the second channel 13. After the detection is completed, the gas flows out of the detection chamber 11 from the first channel 12.

[0038] For the convenience of explanation, the following description will be made by taking the first channel 12 as an air inlet channel and the second channel 13 as an air outlet channel as an example.

[0039] The cavity 10 can have a cylindrical structure. The detection cavity 11 extends through the cavity 10 along its axial direction. The detection cavity 11 includes a first buffer cavity 111, a second buffer cavity 112, a first detection channel 113, and a second detection channel 114. The first buffer cavity 111 and the second buffer cavity 112 are located at opposite ends of the detection cavity 11, while the first detection channel 113 and the second detection channel 114 are located in the middle of the detection cavity 11. The first detection channel 113 and the second detection channel 114 connect the first buffer cavity 111 and the second buffer cavity 112. The first buffer cavity 111 and the second buffer cavity 112 are symmetrically arranged. The radial dimensions of the first buffer cavity 111 and the second buffer cavity 112 are larger than the radial dimensions of the first detection channel 113 and the second detection channel 114, resulting in a larger space in the first buffer cavity 111 and the second buffer cavity 112. The first detection channel 113 and the second detection channel 114 can be straight channels to facilitate the straight passage of the near-infrared light 201 and the mid-infrared light 301, reduce obstructions, and improve detection accuracy. The first detection channel 113 and the second detection channel 114 extend along the axial direction of the detection cavity 11 and are spaced apart along the radial direction of the detection cavity 11 .

[0040] The first channel 12 is connected to the first buffer chamber 111, and the second channel 13 is connected to the second buffer chamber 112. This allows gas to enter the first buffer chamber 111 through the first channel 12. Since the first buffer chamber 111 has a large space, the airflow can be buffered in the first buffer chamber 111 before smoothly entering the first detection channel 113 and the second detection channel 114 for detection, thereby improving detection accuracy. The gas flowing out of the first detection channel 113 and the second detection channel 114 enters the second buffer chamber 112 and is finally discharged through the second channel 13. The second buffer chamber 112 has a large space, so the gas can be buffered in the second buffer chamber 112, thereby reducing the impact on the detection results. In addition, the large space of the first buffer chamber 111 and the second buffer chamber 112 can attenuate external noise and improve detection accuracy.

[0041] The near-infrared emitting mechanism 20 may refer to a mechanism capable of emitting near-infrared light 201; the near-infrared emitting mechanism 20 is arranged opposite the first detection channel 113 through the first opening 115, so that the near-infrared light 201 emitted by the near-infrared emitting mechanism 20 enters the first buffer cavity 111 from the first opening 115 and then enters the first detection cavity 11 in a straight line for detection.

[0042] The mid-infrared emitting mechanism 30 may refer to a mechanism capable of emitting mid-infrared light 301; the mid-infrared emitting mechanism 30 is arranged opposite the second detection channel 114 through the second opening 116, so that the mid-infrared light 301 emitted by the mid-infrared emitting mechanism 30 enters the second buffer cavity 112 from the second opening 116 and then enters the second detection cavity 11 in a straight line for detection.

[0043] The micro-sound mechanism 40 can be a mechanism capable of collecting sound. The micro-sound mechanism 40 can simultaneously capture sound in the first detection channel 113 and the second detection channel 114. When gas enters the first detection channel 113 and the mid-infrared light 301 is emitted into the first detection channel 113, the gas within the first detection channel 113 vibrates, thereby generating sound. By capturing this sound, information such as the gas type and concentration can be obtained. Similarly, when gas enters the first detection channel 113 and the near-infrared light 201 is emitted into the second detection channel 114, the gas within the second detection channel 114 vibrates, thereby generating sound. By capturing this sound, information such as the gas type and concentration can be obtained.

[0044] During the detection process, there are many gas components to be measured, and there is a certain cross-phenomenon in the absorption spectrum of the gas. When measuring under a single light source, there is a certain cross-interference. The embodiment of the present application uses mid-infrared and near-infrared gas detection in the same cavity, which can effectively cross-verify the detection results of the two, realize the removal of interference in the gas detection process, realize deviation warning of the detection results, and obtain more accurate detection results.

[0045] The mid-infrared and near-infrared gas detection device 100 in the embodiment of the present application is provided with a first detection channel 113 and a second detection channel 114 in the cavity 10, and can realize mid-infrared detection and near-infrared detection simultaneously in one detection cavity 11, which can reduce the amount of gas required for detection by the mid-infrared and near-infrared gas detection device 100 in the same cavity, can meet the detection condition of a small amount of gas generated by a transformer fault, and also improves the accuracy of detection; the mid-infrared and near-infrared gas detection device 100 in the same cavity can perform mid-infrared detection and near-infrared detection on the gas in the same cavity 10. On the one hand, it meets the same test environment and can reduce detection errors. On the other hand, by using mid-infrared and near-infrared gas detection in the same cavity, the results of the two can be cross-verified to avoid false alarms or erroneous alarms of the transformer.

[0046] In the mid-infrared and near-infrared same-cavity gas detection device 100 of the embodiment of the present application, the first detection channel 113 and the second detection channel 114 are arranged in parallel and spaced apart, which can reduce the mutual influence between the optical path of the mid-infrared light 301 and the optical path of the near-infrared light 201, reduce interference, and improve detection accuracy. In addition, the detection channel can be reasonably designed based on the characteristics of the optical path (inconsistent characteristics such as wavelength), reduce noise generated by the optical path, and improve detection accuracy.

[0047] In some embodiments, the microphonic mechanism 40 includes a first microphonic device 41 and a second microphonic device 42 . The first microphonic device 41 is installed in the first detection channel 113 , and the second microphonic device 42 is installed in the second detection channel 114 .

[0048] The first microphone 41 and the second microphone 42 can be, but are not limited to, microphones and the like.

[0049] By adopting the technical solution of this embodiment, the first microphone 41 and the second microphone 42 respectively collect the sounds of the first detection channel 113 and the second detection channel 114, which can improve the accuracy of detection. In addition, the first detection channel 113 and the second detection channel 114 are located in the same noise environment, which facilitates the first microphone 41 and the second microphone 42 to compare with each other, facilitates noise reduction, and improves the accuracy of detection.

[0050] In some embodiments, the first microphone 41 is located at an antinode of the sound wave in the first detection channel 113 .

[0051] When the near-infrared light 201 enters the first detection channel 113 and generates sound, the sound is reflected in the first detection channel 113 to form a standing wave. Positions with the largest sound pressure amplitude appear in the first detection channel 113. These positions are the antinodes of the sound waves in the first detection channel 113.

[0052] By adopting the technical solution of this embodiment, the sound pressure amplitude at the position where the first microphone 41 is located is large, which can improve the sound receiving effect of the first microphone 41 and improve the accuracy of the near-infrared detection result.

[0053] In some embodiments, the second microphone 42 is located at an antinode of the acoustic wave in the second detection channel 114 .

[0054] The mid-infrared light 301 enters the second detection channel 114 to generate sound. When the sound is reflected in the second detection channel 114 and a standing wave is generated, positions with the largest sound pressure amplitude appear in the second detection channel 114. These positions are the antinodes of the sound waves in the second detection channel 114.

[0055] By adopting the technical solution of this embodiment, the sound pressure amplitude at the position where the second microphone 42 is located is large, which can improve the sound receiving effect of the second microphone 42 and improve the accuracy of the mid-infrared detection result.

[0056] In some embodiments, the first microphone 41 is located at an antinode of the sound wave in the first detection channel 113 ; the second microphone 42 is located at an antinode of the sound wave in the second detection channel 114 .

[0057] By adopting the technical solution of this embodiment, the sound pressure amplitude at the positions of the first microphone 41 and the second microphone 42 is large, and the first microphone 41 and the second microphone 42 have good sound receiving effects, which can improve the accuracy of the detection result.

[0058] In some embodiments, the detection cavity 11 is a resonant cavity.

[0059] In some examples, the first buffer cavity 111 and the second buffer cavity 112 may be cylindrical cavities 10, and the first detection channel 113 and the second detection channel 114 may be circular channels, which have a simple structure, are easy to process, and have a moderate quality factor.

[0060] By adopting the technical solution of this embodiment, the detection cavity 11 is a resonant cavity, which can form acoustic resonance by accumulating energy in the detection cavity 11, thereby suppressing external noise interference and being able to detect flowing gas, thereby improving the measurement signal-to-noise ratio and improving detection accuracy.

[0061] In some embodiments, a third opening 1111 communicating with the first channel 12 is defined on a cavity wall of the first buffer cavity 111 opposite to the first opening 115 .

[0062] By adopting the technical solution of this embodiment, the third opening 1111, the first detection channel 113 and the second detection channel 114 are located on the same side of the first buffer cavity 111. In this way, after the gas enters the second buffer cavity 112 from the third opening 1111, it needs to turn before entering the first detection channel 113 and the second detection channel 114. This turn can provide a buffer, reduce noise interference, and improve the accuracy of detection.

[0063] In some embodiments, the first channel 12 is located between the first buffer cavity 111 and the second buffer cavity 112 and is arranged close to the first buffer cavity 111. The first channel 12 includes a first section 121 and a second section 122 that are perpendicular to each other. The first section 121 extends from the third opening 1111 along the axial direction of the first detection channel 113 toward the second buffer cavity 112 and is connected to the second section 122. In this way, the airflow bends once when flowing through the first section 121 and the second section 122, which can reduce noise interference and improve detection accuracy.

[0064] In some embodiments, a fourth opening 1121 communicating with the second channel 13 is defined on a cavity wall of the second buffer cavity 112 opposite to the second opening 116 .

[0065] By adopting the technical solution of this embodiment, the fourth opening 1121, the first detection channel 113 and the second detection channel 114 are located on the same side of the second buffer cavity 112. In this way, after the gas flows out of the first detection channel 113 and the second detection channel 114, it needs to turn in the second buffer cavity 112 before entering the fourth outlet. This turn can provide a buffer, reduce noise interference, and improve the accuracy of detection.

[0066] In some embodiments, the second channel 13 is located between the first buffer cavity 111 and the second buffer cavity 112 and is arranged close to the second buffer cavity 112. The second channel 13 includes a third section 131 and a fourth section 132 that are perpendicular to each other. The third section 131 extends from the fourth opening 1121 along the axial direction of the second detection channel 114 toward the first buffer cavity 111 and is connected to the fourth section 132. In this way, the airflow bends once when flowing through the third section 131 and the fourth section 132, which can reduce noise interference and improve detection accuracy.

[0067] In some embodiments, a third opening 1111 communicating with the first channel 12 is defined on the wall of the first buffer chamber 111 opposite to the first opening 115 ; a fourth opening 1121 communicating with the second channel 13 is defined on the wall of the second buffer chamber 112 opposite to the second opening 116 .

[0068] By adopting the technical solution of this embodiment, noise interference can be reduced and the accuracy of detection can be improved.

[0069] In some embodiments, the near-infrared emitting mechanism 20 includes a near-infrared laser 21, a first collimating lens 22 and a first dichroic mirror 23. The near-infrared laser 21 is used to emit near-infrared light 201. The first collimating lens 22, the first dichroic mirror 23 and the first buffer cavity 111 are arranged in sequence along the optical path of the near-infrared light 201; the first dichroic mirror 23 is arranged opposite to the first detection channel 113 and the second detection channel 114. The first dichroic mirror 23 is used to allow the near-infrared light 201 to pass through and can reflect the mid-infrared light 301.

[0070] The near-infrared laser 21 may refer to a component for emitting near-infrared light 201 .

[0071] The first collimating lens 22 may be an optical lens capable of converting the near-infrared light 201 emitted by the near-infrared laser 21 into parallel near-infrared light.

[0072] The first dichroic mirror 23 may refer to a component that allows the near-infrared light 201 to pass therethrough and reflects the mid-infrared light 301 .

[0073] The optical path of the near-infrared light 201 is parallel to the length direction of the first detection channel 113. The near-infrared laser 21, the first collimating lens 22 and the first dichroic mirror 23 are distributed in sequence along the length direction of the first detection channel 113. The near-infrared laser 21, the first collimating lens 22 and the first dichroic mirror 23 are located outside the first buffer cavity 111, and the first dichroic mirror 23 is located between the first buffer cavity 111 and the first collimating lens 22. The near-infrared laser 21 and the first collimating lens 22 are both arranged opposite to the first detection channel 113. The first dichroic mirror 23 can be embedded in the first opening 115 or cover the first opening 115, thereby being arranged opposite to the first opening 115.

[0074] By adopting the technical solution of this embodiment, the near-infrared light 201 emitted by the near-infrared laser 21 is corrected by the first collimating lens 22 and becomes parallel near-infrared light 201. After passing through the first dichroic mirror 23, the near-infrared light 201 enters the first buffer cavity 111 and the first detection channel 113 for detection. After being corrected by the first collimating lens 22, the propagation distance and concentration of the near-infrared light 201 in the first detection channel 113 are increased, which is conducive to improving the accuracy of the detection results. In addition, the mid-infrared light 301 emitted by the mid-infrared emission mechanism 30 passes through the second detection channel 114 and the first buffer cavity 111, and then is reflected by the first dichroic mirror 23 and re-enters the second detection channel 114. This increases the propagation distance of the mid-infrared light 301 in the second detection channel 114, thereby improving the accuracy of the detection results.

[0075] In some embodiments, the mid-infrared emitting mechanism 30 includes a mid-infrared laser 31, a second collimating lens 32 and a second dichroic mirror 33. The mid-infrared laser 31 is used to emit mid-infrared light 301. The second collimating lens 32, the second dichroic mirror 33 and the second buffer cavity 112 are arranged in sequence along the optical path of the mid-infrared light 301; the second dichroic mirror 33 is installed at the second opening 116, and the second dichroic mirror 33 is arranged opposite to the first detection channel 113 and the second detection channel 114. The second dichroic mirror 33 is used to allow the mid-infrared light 301 to pass through and can reflect the near-infrared light 201.

[0076] The second collimating lens 32 may be an optical lens capable of converting the mid-infrared light 301 emitted by the mid-infrared laser 31 into parallel mid-infrared light.

[0077] The second dichroic mirror 33 may refer to a component that allows the mid-infrared light 301 to pass therethrough and reflects the near-infrared light 201 .

[0078] The mid-infrared laser 31, the second collimating lens 32 and the second dichroic mirror 33 are distributed in sequence along the optical path of the mid-infrared light 301. The mid-infrared laser 31, the second collimating lens 32 and the second dichroic mirror 33 are located outside the second buffer cavity 112. The second dichroic mirror 33 can be embedded in the second opening 116 or cover the second opening 116, thereby being arranged opposite to the second opening 116.

[0079] By adopting the technical solution of this embodiment, the mid-infrared light 301 emitted by the mid-infrared laser 31 is corrected by the second collimating lens 32 to become parallel mid-infrared light 301. After passing through the second dichroic mirror 33, the mid-infrared light 301 enters the second buffer cavity 112 and the second detection channel 114 for detection. After being corrected by the second collimating lens 32, the propagation distance and concentration of the mid-infrared light 301 in the second detection channel 114 are increased, which is conducive to improving the accuracy of the detection results. In addition, the near-infrared light 201 emitted by the near-infrared emission mechanism 20 passes through the first detection channel 113 and the second buffer cavity 112, and then is reflected by the second dichroic mirror 33 and re-enters the first detection channel 113. This increases the propagation distance of the near-infrared light 201 in the first detection channel 113, thereby improving the accuracy of the detection results.

[0080] In some embodiments, the mid-infrared emitting mechanism 30 further includes a reflector 34 , which is disposed between the second dichroic mirror 33 and the second collimating lens 32 to change the propagation direction of the mid-infrared light 301 emitted from the second collimating lens 32 .

[0081] The reflective member 34 may refer to a component that reflects the mid-infrared light 301; in some examples, the reflective member 34 may be tilted 45 degrees relative to the second dichroic mirror 33, so that the mid-infrared laser 31 and the second collimating lens 32 may be distributed radially along the second detection channel 114, thereby reducing the axial dimension of the mid-infrared and near-infrared same-cavity gas detection device 100 along the second detection channel 114.

[0082] By adopting the technical solution of this embodiment, the reflector 34 can reflect the mid-infrared light 301, thereby changing the optical path of the near-mid-infrared light 301, and can change the arrangement positions of the mid-infrared laser 31 and the second collimating lens 32, so as to make the structural arrangement more compact, which is conducive to reducing the external dimensions of the mid-infrared and near-infrared same-cavity gas detection device 100.

[0083] In some embodiments, the wavelength of the mid-infrared light 301 ranges from 2980 nm to 3026 nm.

[0084] The wavelength of the mid-infrared light 301 may be 2980 nm, 3026 nm, or any value between 2980 nm and 3026 nm. For example, the wavelength of the mid-infrared light 301 may be, but is not limited to, 2980 nm, 3000 nm, 3010 nm, 3020 nm, or 3026 nm.

[0085] By adopting the technical solution of this embodiment, the wavelength of the mid-infrared light 301 is within this range, and the absorption line intensity of the fault characteristic gas to the mid-infrared light 301 is good, which is conducive to improving detection accuracy.

[0086] In some embodiments, the wavelength of the near infrared light 201 is in the range of 1500 nm to 1532 nm.

[0087] The wavelength of the near-infrared light 201 may be 1500 nm, 1532 nm, or any value between 1500 nm and 1532 nm. For example, the wavelength of the near-infrared light 201 may be, but is not limited to, 1500 nm, 1510 nm, 1520 nm, 1530 nm, or 1532 nm.

[0088] By adopting the technical solution of this embodiment, the wavelength of the near-infrared light 201 is within this range, and the absorption line intensity of the fault characteristic gas to the near-infrared light 201 is good, which is conducive to improving detection accuracy.

[0089] In some embodiments, the wavelength range of the mid-infrared light 301 is 2980 nm to 3026 nm; the wavelength range of the near-infrared light 201 is 1500 nm to 1532 nm.

[0090] In some examples, by utilizing mid-infrared and near-infrared gas detection in the same cavity, the detection results of the two can be effectively cross-verified, interference in the gas detection process can be removed, deviation warning of the detection results can be achieved, and more accurate detection results can be obtained; it can also be well achieved that when the hydrogen H2 content is less than 50μL / L and the carbon monoxide (CO) content is greater than 1000μL / L, the hydrogen detection error meets the ±2μL / L or ±30% requirements; when the content of other hydrocarbons is less than 10μL / L, the ethane (C2H6) content is greater than 150μL / L, and the carbon dioxide (CO2) content is greater than 5000μL / L, the methane, ethane, ethylene, and acetylene detection errors meet the ±0.5μL / L or ±30% requirements.

[0091] By adopting the technical solution of this embodiment, the absorption intensity of mid-infrared light 301 by the fault characteristic gas can be more than ten times, and sometimes even tens of thousands times, higher than that of near-infrared light 201. Therefore, mid-infrared light 301 can be used as detection light, eliminating interference and improving detection sensitivity and the minimum detection limit.

[0092] In some embodiments, the cavity 10 is a stainless steel cavity 10 .

[0093] The cavity 10 is made of stainless steel.

[0094] By adopting the technical solution of this embodiment, the stainless steel cavity 10 can isolate the errors introduced into the measurement process by external noise, thereby improving the detection accuracy.

[0095] The above description of the various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced with each other and will not be repeated herein for the sake of brevity.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A mid-infrared and near-infrared gas detection device with the same cavity, characterized in that: include: A cavity body having a detection cavity and a first channel and a second channel communicating with the detection cavity, wherein one of the first channel and the second channel is used for allowing gas to flow into the detection cavity, and the other is used for allowing the gas to flow out of the detection cavity; The detection chamber includes a first buffer chamber, a second buffer chamber, a first detection channel and a second detection channel, the first detection channel is connected between the first buffer chamber and the second buffer chamber, the second detection channel is connected between the first buffer chamber and the second buffer chamber, and the first detection channel and the second detection channel are parallel and spaced apart; The cavity has a first opening communicating with the first buffer cavity and a second opening communicating with the second buffer cavity, the first opening being located on a side of the first buffer cavity facing away from the second buffer cavity, and the second opening being located on a side of the second buffer cavity facing away from the first buffer cavity; the first channel communicating with the first buffer cavity, and the second buffer cavity communicating with the second channel; a near-infrared emitting mechanism, disposed at an end of the cavity close to the first opening, the near-infrared emitting mechanism being configured to emit near-infrared light, the near-infrared light being capable of entering the first detection channel through the first opening and the first buffer cavity; a mid-infrared emitting mechanism, disposed at an end of the cavity near the second opening, the mid-infrared emitting mechanism being configured to emit mid-infrared light, the mid-infrared light being capable of entering the second detection channel through the second opening and the second buffer cavity; A micro-sound mechanism is provided in the cavity, and is used to collect sounds in the first detection channel and the second detection channel.

2. The mid-infrared and near-infrared gas detection device in the same cavity according to claim 1 is characterized in that: The micro-phone mechanism includes a first micro-phone and a second micro-phone. The first micro-phone is installed in the first detection channel, and the second micro-phone is installed in the second detection channel.

3. The mid-infrared and near-infrared gas detection device in the same cavity according to claim 2, characterized in that: The first microphone is located at an antinode of the sound wave in the first detection channel; and / or the second microphone is located at an antinode of the sound wave in the second detection channel.

4. The mid-infrared and near-infrared gas detection device in the same cavity according to any one of claims 1 to 3, characterized in that: The detection cavity is a resonant cavity.

5. The mid-infrared and near-infrared gas detection device in the same cavity according to any one of claims 1 to 3, characterized in that: A third opening communicating with the first channel is provided on a cavity wall of the first buffer cavity opposite to the first opening; And / or, a fourth opening communicating with the second channel is provided on a cavity wall of the second buffer cavity opposite to the second opening.

6. The mid-infrared and near-infrared gas detection device in the same cavity according to any one of claims 1 to 3, characterized in that: The near-infrared emitting mechanism includes a near-infrared laser, a first collimating lens and a first dichroic mirror. The near-infrared laser is used to emit the near-infrared light. The first collimating lens, the first dichroic mirror and the first buffer cavity are arranged in sequence along the optical path of the near-infrared light; the first dichroic mirror is arranged opposite to the first detection channel and the second detection channel. The first dichroic mirror is used to allow the near-infrared light to pass through and can reflect the mid-infrared light.

7. The mid-infrared and near-infrared gas detection device in the same cavity according to any one of claims 1 to 3, characterized in that: The mid-infrared emitting mechanism includes a mid-infrared laser, a second collimating lens and a second dichroic mirror. The mid-infrared laser is used to emit the mid-infrared light. The second collimating lens, the second dichroic mirror and the second buffer cavity are arranged in sequence along the optical path of the mid-infrared light; the second dichroic mirror is installed at the second opening, and the second dichroic mirror is arranged opposite to the first detection channel and the second detection channel. The second dichroic mirror is used to allow the mid-infrared light to pass through and can reflect the near-infrared light.

8. The mid-infrared and near-infrared gas detection device in the same cavity according to claim 7, characterized in that: The mid-infrared emitting mechanism further includes a reflector, which is disposed between the back of the second dichroic mirror and the second collimating lens to change a propagation direction of the mid-infrared light emitted through the second collimating lens.

9. The mid-infrared and near-infrared gas detection device in the same cavity according to any one of claims 1 to 3, characterized in that: The wavelength range of the mid-infrared light is 2980nm to 3026nm; and / or the wavelength range of the near-infrared light is 1500nm to 1532nm.

10. The mid-infrared and near-infrared gas detection device in the same cavity according to any one of claims 1 to 3, characterized in that: The cavity is a stainless steel cavity.

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