A hybrid device gas composition measurement optical sensor

Abstract

This application discloses an optical sensor for measuring gas components in mixing equipment, belonging to the field of gas component detection technology. It includes several arranged measurement units, each comprising a laser and a detector. Each measurement unit further includes, along the direction of the incident beam emitted by the laser, an optical component, a suction cavity, an open cavity, and a main hollow roof prism arranged sequentially. The optical component is sealed to the suction cavity, and the suction cavity is connected to the open cavity. The laser and the detector are located at the same end of the optical component. This application achieves a compact layout of the various structures within the measurement unit. Furthermore, by utilizing the reflection of the incident beam by the main hollow roof prism and the optical component, multiple round-trip optical paths are formed within the gas absorption cell formed by the suction cavity and the open cavity, ensuring the required absorption optical path for various gases and meeting the measurement needs of mixing equipment of various sizes.

Description

Technical Field

[0001] This application belongs to the field of gas composition detection technology, and specifically relates to an optical sensor for measuring gas composition in a mixing device. Background Technology

[0002] As a core category of energetic materials, the production process of explosives involves multiple complex chemical reactions such as nitration, esterification, and amination. Various characteristic gases are generated and consumed within the mixing equipment, and the dynamic changes in gas composition and concentration directly reflect the reaction progress, material conversion rate, and reaction safety. Accurate and real-time capture of this gas information is a crucial prerequisite for achieving closed-loop control of the explosives production process, improving product quality consistency, and mitigating safety risks (such as overreaction and explosion hazards caused by localized overheating).

[0003] Currently, the measurement of gas in mixing equipment during the production of explosives mainly relies on offline sampling analysis and traditional online detection technology. Both of these technologies have bottlenecks that are difficult to overcome, and cannot meet the needs of modern explosives production for in-situ, online, high-frequency response, and multi-component synchronous measurement.

[0004] While offline sampling and analysis techniques (such as gas chromatography and mass spectrometry) offer high accuracy in component identification and concentration measurement, they also have inherent drawbacks: First, the sampling process requires interrupting the airtightness of the reaction system. Since the raw materials and products of explosives production are often flammable, explosive, toxic, and hazardous substances, the sampling process can easily lead to leakage risks, endangering production safety. Second, the sampling, transmission, pretreatment, and detection cycles are long (usually several minutes to several hours), making it impossible to reflect the dynamic changes of gases within the mixing equipment in real time. This results in measurement results lagging behind the actual reaction process, making it difficult to support real-time control of process parameters, easily causing batch-to-batch product variations, and even leading to safety accidents due to the failure to detect abnormal gas accumulation in a timely manner. Third, gas components are prone to adsorption, decomposition, or cross-contamination during the sampling process, leading to distorted measurement results and affecting the reliability of process judgment.

[0005] While traditional online detection technologies (such as infrared absorption, electrochemical sensors, and catalytic combustion) have to some extent compensated for the lag in offline detection, they still have significant limitations in their applicability to explosives production scenarios. Infrared absorption is limited by spectral overlap interference, has weak multi-component measurement capabilities, and is poorly resistant to water vapor and dust under complex operating conditions; trace amounts of dust and water vapor generated during explosives reactions can easily lead to a significant decrease in detection accuracy. Electrochemical sensors are highly targeted, capable of measuring only one or a few gases, and cannot meet the need for simultaneous monitoring of multiple components in explosives reactions. Furthermore, sensors are susceptible to aging and failure due to corrosive gases and impurities in the reaction system, resulting in short lifespans and frequent replacements, increasing production costs and maintenance workload. The replacement process also requires interruption of detection, posing safety hazards. Catalytic combustion is only suitable for measuring combustible gases, has a narrow measurement range, and lacks responsiveness to characteristic gases commonly found in explosives production, such as nitro compounds and amines, failing to comprehensively cover process monitoring needs.

[0006] Furthermore, the production of explosives places stringent requirements on the safety and in-situ accuracy of testing technologies. Mixing equipment must maintain a sealed, explosion-proof operating condition. Traditional testing equipment is often difficult to embed directly into the mixing equipment for in-situ measurement, and mostly employs bypass sampling for testing, which still suffers from problems such as transmission lag and component loss. Simultaneously, testing equipment must possess explosion-proof and anti-interference capabilities to avoid ignition or detonation risks to the explosive reaction system. Traditional testing technologies struggle to balance measurement performance and safety requirements in terms of explosion-proof design and adaptability to operating conditions.

[0007] Tunable diode laser absorption spectroscopy (TDLAS), a spectroscopic detection technique based on the selective absorption characteristics of molecules, boasts advantages such as high spectral resolution, strong selectivity, fast response speed, and non-contact measurement, enabling highly sensitive detection of specific gas components. Compared to traditional techniques, TDLAS effectively avoids spectral line overlap interference between multiple gas components by selecting interference-free characteristic absorption lines, achieving simultaneous measurement of multiple components; its response time can reach the millisecond level, meeting the requirements of high-frequency response dynamic monitoring; and it can adapt to complex environments within mixing equipment and achieve in-situ measurement.

[0008] However, the application of existing TDLAS technology in gas measurement within mixing equipment during explosives production processes remains unexplored, and no specific technical solution has yet been developed. The working conditions within explosives mixing equipment are complex, characterized by temperature fluctuations, complex gas compositions, and the coexistence of trace characteristic gases with the main gas. This places special demands on the optical path design, spectral line selection, signal processing algorithms, explosion-proof packaging, and anti-interference capabilities of TDLAS technology. Existing TDLAS technologies are mostly applicable to conventional industrial scenarios (such as chemical tail gas emission monitoring and environmental gas detection). Their optical path structure, detection parameters, and system design cannot be directly adapted to the internal working conditions of explosives mixing equipment, making it difficult to achieve in-situ, stable, and accurate high-frequency response measurement of multi-component gases, and failing to meet the personalized monitoring needs of explosives processes. Furthermore, common TDLAS multi-wavelength detection involves beam combining and splitting. When the number of wavelengths required for detection is large, covering the near-infrared to mid-infrared range with a wide wavelength span, beam combining and splitting become increasingly difficult, requiring complex optomechanical structures that cannot be miniaturized and are challenging to debug and maintain.

[0009] In traditional gas component measurement equipment for mixing devices, to meet the measurement needs of mixing devices of different sizes and ensure a safe distance between the gas detection unit and the stirring mechanism inside the device, it is usually necessary to adjust the length of the internal cavity. When using a multi-reflection gas absorption cell as a sensor, such as the Herriot cell, which uses two concave mirrors as reflectors, if the cavity length changes, the concave mirrors need to be redesigned and manufactured, and the optical path between the laser incident angle and the reflectors needs to be readjusted. Furthermore, adjusting the optical path for mid-infrared invisible light is difficult, thus reducing the device's versatility and increasing maintenance complexity. If multiple ordinary plane mirrors are used to fold the optical path to form multiple reflections, when structural deformation causes a single mirror to rotate by an angle θ, the reflected light deflects by an angle of 2θ. After cumulative reflection from multiple mirrors, the deflection angle increases sharply, exceeding the detector's light receiving range, resulting in poor optical stability of the device. Summary of the Invention

[0010] To address the aforementioned issues, this application provides an optical sensor for measuring gas components in a mixing device.

[0011] The first objective of this application is to provide an optical sensor for measuring gas components in a mixing device, comprising a plurality of arranged measuring units, wherein the measuring units include a laser and a detector;

[0012] The measurement unit further includes: an optical component, an air intake cavity, an open cavity, and a main hollow roof prism arranged sequentially along the direction of the incident beam emitted by the laser; the optical component is sealed to the air intake cavity, and the air intake cavity is connected to the open cavity.

[0013] The laser and the detector are positioned at the same end of the optical assembly.

[0014] In a specific embodiment of this application, the optical component includes an incident sealing window, an exit sealing window, and a plurality of secondary hollow roof prisms, wherein the main hollow roof prism and the secondary hollow roof prisms are arranged opposite to each other.

[0015] In a specific embodiment of this application, both the main hollow roof prism and the secondary hollow roof prism are composed of two mirrors assembled opposite each other.

[0016] The incident beam is reflected by the main hollow roof prism to form a first reflected beam, and the intersection line of the two reflecting mirrors of the main hollow roof prism is perpendicular to the plane formed by the incident beam and the first reflected beam.

[0017] In a specific embodiment of this application, the mirror surfaces of the two reflectors in the main hollow roof prism and the secondary hollow roof prism are arranged at a 90° angle to each other.

[0018] The optical component is sealed to the air intake cavity via a first base, and the optical component is embedded in the first base;

[0019] Both the incident sealing window and the exit sealing window are sealed and embedded in the first base.

[0020] In a specific embodiment of this application, there are two secondary hollow ridge prisms, and the bonding surfaces of the two secondary hollow ridge prisms are at 90° to the bonding surface of the main hollow ridge prism.

[0021] In a specific embodiment of this application, the open cavity is composed of an inner mesh cylinder;

[0022] The main hollow ridge prism is fixed to the end of the open cavity by a second base, and the main hollow ridge prism is embedded in the second base.

[0023] In a specific embodiment of this application, the optical sensor for measuring gas components in a mixing device further includes a housing. The housing covers the outer periphery of the laser, detector, optical components, and suction chamber of the plurality of measurement units. A mounting part is provided at the connection between the suction chamber and the open cavity. The open cavity is disposed outside the housing, and the bottom wall of the housing is sealed by the mounting part.

[0024] The housing has an air extraction port on the wall surface where the mounting part is located.

[0025] The top of the box is provided with ventilation holes.

[0026] In a specific embodiment of this application, the air intake chamber is connected to a gas pipe.

[0027] In a specific embodiment of this application, the measuring unit further includes a heat sink, and the laser and the detector are embedded side by side on the heat sink;

[0028] The optical components also include a mirror assembly, which comprises two mirrors and is respectively paired with the laser and the detector.

[0029] In a specific embodiment of this application, the measuring unit further includes a branch air path cooling plate, which is disposed on top of a plurality of arranged heat sinks and communicates with vent holes.

[0030] In a specific embodiment of this application, the measuring unit further includes an outer mesh cylinder, which covers the outer periphery of the plurality of open cavities;

[0031] The outer mesh cylinder is a mesh cylinder composed of two layers of mesh, with the mesh diameter of the inner layer being smaller than that of the outer layer.

[0032] In a specific embodiment of this application, the optical sensor for measuring gas components in a mixing device further includes a mounting flange, which is sealed to the bottom wall of the housing and the measuring unit is sealed and installed at the installation location of the mixing device through the mounting flange, and the open cavity is located inside the mixing device;

[0033] The installation location is either the sight glass port or an unused feeding port of the mixing equipment.

[0034] Compared with the prior art, this application has the following advantages:

[0035] This application discloses an optical sensor for measuring gas components in a mixing device. Through a plurality of arranged measurement units, it realizes synchronous non-contact in-situ measurement of multi-component gases with a response time down to the millisecond level.

[0036] This application achieves a compact layout of the various structures in the measurement unit through a combination of "optical components, a gas-absorbing cavity, an open cavity, and a main hollow roof prism arranged sequentially on the incident beam emitted by the laser" and "the laser and the detector being positioned at the same end of the optical components." Furthermore, by utilizing the reflection of the incident beam by the main hollow roof prism and the optical components, multiple round-trip optical paths are formed within the gas absorption cell formed by the gas-absorbing cavity and the open cavity, ensuring the required absorption optical path for various gases and meeting the measurement needs of mixed devices of various sizes. Moreover, when using a tubular cavity, this application can achieve a tubular cavity diameter of less than 25 mm.

[0037] This application isolates the air intake chamber from the gas outside the mixing device by "sealing the optical component with the air intake chamber", ensuring that the air intake chamber only comes into contact with the gas to be tested (the gas inside the mixing device), making it a passive optical sensor that will not cause the risk of ignition or explosion of the explosives due to circuit failure.

[0038] This application improves the convenience of debugging "multiple round trip optical paths" by setting up a main hollow roof prism and a secondary hollow roof prism (both of which are "composed of two mirrors assembled relative to each other"). At the same time, it solves the problem that the deflection angle caused by traditional plane mirrors or concave mirrors will increase sharply. It achieves the goal of maintaining the parallelism between beams in a narrow space without redesigning and processing the mirrors. Only the distance between the main and secondary hollow roof prisms needs to be changed structurally. As long as the laser incident angle remains unchanged, the change in spacing has little impact on the optical path.

[0039] This application achieves three round-trip optical paths and six beams by combining two secondary hollow roof prisms and a primary hollow roof prism, which greatly increases the gas absorption optical path, achieves a lower detection limit, and improves detection sensitivity. At the same time, the equipment has good versatility and the optical path of the equipment is easy to maintain.

[0040] Each gas laser and detector used in this application constitutes an independent measurement unit with its gas absorption cell, which can be pulled out from the mounting flange at the mixing equipment installation site for independent maintenance. Its compact structure allows for the miniaturization of the gas absorption cell with multiple round-trip optical paths within the measurement unit (two secondary hollow roof prisms and a main hollow roof prism, achieving a 6-beam path with a diameter of less than 25mm), facilitating the placement of more sensors on the sight glass flanges of different mixing equipment to achieve the measurement of multiple gases.

[0041] Furthermore, this application is easy to install, requiring no new area to be created in the mixing equipment; the existing sight glass or unused feeding port in the mixing equipment can be used as the installation site.

[0042] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This diagram shows an assembly of a pyrotechnic mixing apparatus and a gas component measuring optical sensor according to an embodiment of this application. Figure 1 Figure 'a' is a schematic diagram of the structure of an optical sensor for measuring gas components in a mixing device. Figure 1 Figure b shows a schematic diagram of a gas component measurement optical sensor installed in a pyrotechnic mixing device.

[0045] Figure 2 A schematic diagram of multiple round-trip optical paths according to an embodiment of this application is shown;

[0046] Figure 3 One of the assembly schematic diagrams of a first base, an intake chamber, and an open cavity of a gas component measurement optical sensor according to an embodiment of this application is shown;

[0047] Figure 4 One of the assembly schematic diagrams of several measuring units according to an embodiment of this application is shown;

[0048] Figure 5 A schematic diagram of a hollow roof prism according to an embodiment of this application is shown, which is assembled by bonding two trapezoidal reflecting prisms together.

[0049] In the diagram: 100, mixing equipment; 101, installation location; 102, stirring mechanism; 103, mounting flange; 104, installation distance; 200, housing; 201, laser; 202, detector; 203, suction chamber; 204, heat sink; 205, mounting section; 206, first reflecting prism; 207, first base; 208, incident sealing window; 209, first hollow roof prism; 210, second hollow roof prism; 211, exit sealing window; 212. 213. Second reflecting prism; 214. Branch gas cooling plate; 215. Gas pipe; 216. Exhaust port; 217. Explosion-proof hose; 218. Vent hole; 300. Inner mesh cylinder; 301. Second base; 302. Main hollow ridge prism; 303. Outer mesh cylinder; 304. Intersecting line; 401. Incident beam; 402. First reflected beam; 403. Second reflected beam; 404. Third reflected beam; 405. Fourth reflected beam; 406. Outgoing beam; 500. Bonding surface. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] like Figure 1 As shown in Figure a, a gas component measuring optical sensor for a pyrotechnic mixing apparatus 100 according to certain embodiments of this application includes a plurality of arranged measuring units, wherein the measuring unit includes a laser 201 and a detector 202;

[0052] The measurement unit further includes: optical components, an air intake cavity 203, an open cavity, and a main hollow roof prism 302 arranged sequentially along the direction of the incident beam 401 emitted by the laser 201 (see...). Figure 2 The optical component is sealed to the air intake cavity 203, and the air intake cavity 203 is connected to the open cavity, thereby forming an internally connected gas absorption pool.

[0053] The laser 201 and the detector 202 are arranged at the same end of the optical assembly;

[0054] The open cavity is configured as a gas inlet channel;

[0055] In this embodiment, the incident beam 401 passes through the optical component and enters the air intake cavity 203 and the open cavity. It is then reflected by the main hollow roof prism 302 and the optical component, forming multiple round-trip optical paths within the gas absorption cell to ensure the required absorption optical path for various gases in a confined space. Finally, an outgoing beam 406 is formed, which is then received by the detector 202 after passing through the optical component again.

[0056] In this embodiment, a number of arranged measurement units enable synchronous non-contact in-situ measurement of multi-component gases, with a response time down to the millisecond level.

[0057] Moreover, in this embodiment, by combining "optical components, air intake cavity 203, open cavity and main hollow roof prism 302 arranged sequentially on the incident beam 401 emitted by the laser 201" and "the laser 201 and the detector 202 arranged at the same end of the optical components", a compact layout of each structure in the measurement unit is achieved, which solves the problem of limited space in the mixing device 100, and thus solves the problem that traditional measurement devices cannot achieve in-situ measurement due to size issues in a small space, while ensuring the absorption optical path required for the detection of various gases in a small space;

[0058] Furthermore, by sealing the optical component with the intake chamber 203, the contact between the intake chamber 203 and the gas outside the mixing device 100 is isolated, ensuring that the intake chamber 203 only contacts the gas to be tested (the gas inside the mixing device 100), making it a passive optical sensor that will not cause the mixing device (such as a fire explosive mixing device) to ignite or explode due to circuit failure.

[0059] In some embodiments of this application, the air intake cavity 203 is a tubular cavity composed of hollow pipes. Due to the compact layout of the various structures in the measurement unit, the diameter of the tubular cavity can be less than 25mm.

[0060] In some embodiments of this application, the electrical control cables of the laser 201 and the detector 202 are connected to an electronic control box outside the mixing device 100 via an explosion-proof flexible conduit 216.

[0061] In some embodiments of this application, the optical components include an incident sealing window 208, an exit sealing window 211, and a plurality of hollow roof prisms;

[0062] The incident sealing window 208 is used to be projected by the incident light beam 401 and enter the air intake cavity 203 through the incident sealing window 208;

[0063] The exit sealing window 211 is used to be projected by the exit beam 406 and received by the detector 202 through the exit sealing window 211;

[0064] The main hollow ridge prism 302 and the secondary hollow ridge prism are arranged opposite to each other to form multiple round-trip optical paths.

[0065] In some embodiments of this application, both the main hollow roof prism 302 and the secondary hollow roof prism are composed of two mirrors assembled opposite each other, in order to improve the convenience of debugging the "multiple round trip optical path".

[0066] In some embodiments of this application, for example, the reflector is a right-angle prism reflector, and the hollow roof prism is composed of two right-angle reflecting prisms bonded together, with the bonding surface between the two right-angle reflecting prisms at a 50° angle. Figure 5 As shown.

[0067] In some embodiments of this application, the mirror surfaces of the two reflectors in the main hollow ridge prism 302 and the secondary hollow ridge prism are arranged at a 90° angle to each other, so as to ensure that the "multiple round-trip optical paths" do not intersect, reduce the difficulty of optical path debugging, and decompose and reduce the impact of small angle changes caused by deformation in various directions on the "multiple round-trip optical paths".

[0068] In some embodiments of this application, the intersection line 304 of the two reflecting mirrors of the main hollow roof prism 302 is perpendicular to the plane formed by the incident beam 401 and the first reflected beam 402 (the incident beam 401 is reflected by the main hollow roof prism 302 to form the first reflected beam 402), so as to keep the incident beam 401 and the first reflected beam 402 at 180°.

[0069] In some embodiments of this application, for example, the number of the subhollow roof prisms is two, in order to reduce the volume of the gas composition measuring optical sensor.

[0070] In some embodiments of this application, the mirror surfaces of the main hollow ridge prism 302 and the secondary hollow ridge prism, which are assembled from two mirrors, are arranged at a 90° angle to each other. Furthermore, the bonding surfaces 500 of the two secondary hollow ridge prisms are both at 90° to the bonding surface 500 of the main hollow ridge prism 302. This ensures parallelism between multiple round trips of light rays, reducing the difficulty of optical path adjustment. See details... Figure 2 .

[0071] When the number of the secondary hollow roof prisms is two, including the first hollow roof prism 209 and the second hollow roof prism 210, see details. Figure 4 At this time, three round-trip optical paths and six optical paths are formed in the air intake cavity 203 and the open cavity. The specific optical path is as follows: The incident beam 401 enters the incident sealing window 208. In the YZ plane perpendicular to the intersection line 304 of the main hollow ridge prism 302, the incident beam 401 is reflected by the two inclined surfaces of the main hollow ridge prism 302 and then reflected at 180° to form the first reflected beam 402. The first reflected beam 402 is transmitted to the first hollow ridge prism 209. In the XZ plane perpendicular to the intersection line 304 of the first hollow ridge prism 209, it is reflected by the two inclined surfaces of the first hollow ridge prism 209 and then reflected at 180° to form the second reflected beam. 403. The second reflected beam 403 is in the YZ plane. After being reflected by the two inclined surfaces of the main hollow ridge prism 302, it is reflected by 180° to form a third reflected beam 404. The third reflected beam 404 is transmitted to the second hollow ridge prism 210. The third reflected beam 404 is in the XZ plane. After being reflected by the two inclined surfaces of the second hollow ridge prism 210, it is reflected by 180° to form a fourth reflected beam 405. The fourth reflected beam 405 is in the YZ plane. After being reflected by the two inclined surfaces of the main hollow ridge prism 302, it is reflected by 180° to form an outgoing beam 406, which leaves the air intake cavity 203 through the outgoing sealing window 211.

[0072] In some embodiments of this application, the optical component is sealed to the air intake cavity 203 via a first base 207, and the optical component is embedded in the first base 207.

[0073] In some embodiments of this application, the incident sealing window 208, the exit sealing window 211, and the two subhollow roof prisms are all embedded in the first base 207;

[0074] Furthermore, the incident sealing window 208 and the exit sealing window 211 are both sealed and embedded within the first base 207;

[0075] The incident sealing window 208 and the exit sealing window 211 are arranged side by side, and the two secondary hollow roof prisms are arranged side by side and avoid the incident beam 401 and the exit beam 406, so that the incident beam 401 is projected onto the incident sealing window 208 and the exit beam 406 is projected onto the exit sealing window 211.

[0076] like Figure 3 As shown, in some embodiments of this application, the open cavity is composed of an inner mesh cylinder 300, and the mesh openings on the inner mesh cylinder 300 are used for the gas to be tested in the mixing device 100 to enter the open cavity.

[0077] In some embodiments of this application, the main hollow roof prism 302 is fixed to the end of the open cavity by a second base 301.

[0078] In some embodiments of this application, a housing 200 is also included, which covers the outer periphery of the laser 201, detector 202, optical components, and air intake cavity 203 of the plurality of measurement units (see [reference]). Figure 1 (a) The air intake chamber 203 is provided with a mounting part 205 at the connection between it and the open cavity (see section a). Figure 4 The open cavity is located outside the housing 200, and the bottom wall of the housing 200 is sealed by the mounting part 205.

[0079] In some embodiments of this application, the air intake cavity 203 and the open cavity are integrally formed.

[0080] In some embodiments of this application, the intake chamber 203 is connected to the open chamber by welding.

[0081] In some embodiments of this application, the wall surface of the housing 200 with the mounting part 205 is provided with an exhaust port 215. The exhaust port 215 is used to connect to an exhaust system to accelerate the replacement of air inside the housing 200, so as to ensure that there is no background gas absorption interference between the laser 201, the detector 202 and the incident sealing window 208 and the exit sealing window 211, thereby improving the measurement accuracy. At the same time, it ensures that the electronic components inside the housing 200 work in an oxygen-free environment, which can avoid the danger of electric sparks caused by circuit failures to the explosives.

[0082] In some embodiments of this application, the top of the housing 200 is provided with a vent 217, which is used to introduce nitrogen gas. When the laser 201 and detector 202 are too hot, low-temperature nitrogen gas is introduced through the vent 217 to cool down the laser 201 and detector 202.

[0083] In some embodiments of this application, the suction chamber 203 is connected to a gas pipe 214, which is used to connect to an external air extraction system of the housing 200. When the gas to be tested diffuses slowly in the mixing device 100, it can be quickly extracted and measured, so that the gas to be tested can quickly enter the gas absorption pool.

[0084] In some embodiments of this application, the measuring unit further includes a heat sink 204, and the laser 201 and the detector 202 are mounted side by side on the heat sink 204 to facilitate heat dissipation of the laser 201 and the detector 202.

[0085] In some embodiments of this application, the measuring unit further includes a branch gas path cooling plate 213, which is disposed on top of a plurality of arranged heat sinks 204 and communicates with the vent 217 to divide the nitrogen gas introduced from the vent 217 into multiple cooling gas paths to improve cooling efficiency.

[0086] For example, the number of measuring units is four, and the number of heat sinks 204 is also four, to facilitate the mounting of four sets of lasers 201 and detectors 202. Correspondingly, the branch gas cooling plate 213 has four branch gas paths. Specifically, the branch plate is a square plate with exhaust holes at its four corners to divide one gas path into four branch gas paths, allowing for nitrogen purging and cooling of each heat sink. See details... Figure 4 .

[0087] In some embodiments of this application, the optical component further includes a mirror group comprising two mirrors. The mirror group cooperates with the laser 201 and the detector 202 respectively, to achieve the following: the light beam emitted by the laser 201 is reflected by one mirror in the mirror group to form an incident light beam 401; the outgoing light beam 406 is reflected by another mirror in the mirror group and detected by the detector 202. For example, the mirror group includes a first reflecting prism 206 and a second reflecting prism 212, as detailed in [link to details]. Figure 3 .

[0088] In some embodiments of this application, the reflector assembly is fixed to the first base 207 by an L-shaped mounting plate.

[0089] In some embodiments of this application, the measuring unit further includes an outer mesh cylinder 303, which covers the outer periphery of the plurality of open cavities to filter out particles from the mixing device 100 that enter the gas absorption pool.

[0090] In some embodiments of this application, the outer mesh cylinder 303 is a mesh cylinder composed of two layers of mesh. The mesh diameter of the inner layer mesh is smaller than that of the outer layer mesh. The inner layer mesh filters out fine particles to prevent contamination of the optical elements in the gas absorption pool. The outer layer mesh is made of rigid metal to provide structural support for the inner layer mesh and prevent screws and other metal debris from falling into the mixing equipment 100 and causing danger.

[0091] In some embodiments of this application, the laser 201 is, for example, a near-infrared or mid-infrared laser 201. To achieve a lower detection limit, an ICL (interband cascaded laser 201) or QCL (quantum cascaded laser 201) laser 201 with stronger absorption in the mid-infrared band is preferred, and it is typically packaged in TO66 or HHL. Correspondingly, the detector 202 is an HgCdTe (mercury cadmium telluride) detector 202 that responds to this band, and it is typically packaged in TO66.

[0092] In some embodiments of this application, for example, the first base 207 is a square base.

[0093] In some embodiments of this application, for example, the second base 301 is a circular base.

[0094] In some embodiments of the present invention, the gas component measurement optical sensor further includes a mounting flange 103, which is sealed to the bottom wall of the housing 200, as detailed below. Figure 4 The measuring unit is sealed and mounted on the mounting location 101 of the mixing device 100 via the mounting flange 103, and the open cavity is located inside the mixing device 100.

[0095] The mounting flange 103 includes a mating part and a connecting part. The mating part cooperates with the first through hole opened on the bottom wall of the housing 200 to ensure the sealing of the bottom wall of the housing 200.

[0096] The matching part is provided with a plurality of second through holes that cooperate with the open cavity. For example, the number of the second through holes is the same as the number of the measuring units.

[0097] The first through hole and the second through hole are provided for the passage of the open cavity, so that the open cavity is located outside the box 200;

[0098] The matching part is also provided with a sealing ring groove that mates with the mounting part 205;

[0099] The connecting part is used to press and connect the outer cover mesh cylinder 303.

[0100] Detailed installation process:

[0101] The laser 201, detector 202, optical components, air intake cavity 203, open cavity, and main hollow roof prism 302 in several (example 4) measurement unit groups are assembled according to the connection relationship in the above embodiment to obtain the mounting part 205 on the assembled several measurement units.

[0102] The mounting flange 103 is sealed to the bottom wall of the housing 200;

[0103] The mounting parts 205 on the assembled measuring units are installed onto the mounting flange 103, such that the sealing ring grooves of the mounting parts 205 and the mating parts of the mounting flange 103 are engaged to block the second through hole on the mounting flange 103, thus completing the sealing process. Figure 4 Installation (i.e., obtaining the assembly);

[0104] The outer mesh cylinder 303 is inserted into the mounting location 101 of the mixing device 100;

[0105] The assembly is inserted into the outer mesh cylinder 303, and the outer mesh cylinder 303 is pressed and fixed by the connecting part on the mounting flange 103.

[0106] The peripheral wall of the housing 200 is placed on the bottom wall of the housing 200 and fixedly connected to obtain a sealed housing 200 and measuring unit as a whole.

[0107] In some embodiments of this application, the bottom wall of the housing 200 and the mounting flange 103 can be integrally formed, simplifying the installation process.

[0108] In some embodiments of this application, the installation location 101 is the sight glass port or the idle feeding port of the mixing device 100.

[0109] In some embodiments of this application, the size of the mounting flange 103 is matched with the size of the mounting location 101 (sight glass opening or idle feeding port), so that the housing 200 is sealed and fitted into the sight glass opening or idle feeding port of the mixing device 100, and the open cavity is located inside the mixing device 100.

[0110] See details Figure 1 In some embodiments of this application, the distance between the top of the outer mesh cylinder 303 and the stirring mechanism 102 in different mixing devices 100 is the installation distance 104. The size of the installation distance 104 is set according to the stirring amplitude of the stirring mechanism 102. The setting of the installation distance 104 is to ensure the smooth stirring of the stirring mechanism 102.

[0111] When the installation distance 104 is required to be large, the length of the outer mesh cylinder 303 is reduced, which in turn reduces the length of the inner mesh cylinder 300. In order to ensure that the total optical path of measurement remains unchanged, that is, to ensure that the length of the gas absorption cell remains unchanged, the length of the gas absorption cavity 203 should be increased.

[0112] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A hybrid device gas composition measurement optical sensor, characterized by, It includes several arranged measurement units, each of which includes a laser (201) and a detector (202). The measurement unit further includes: an optical component, an air intake cavity (203), an open cavity, and a main hollow roof prism (302) arranged sequentially along the direction of the incident beam (401) emitted by the laser (201). The optical component is sealed to the air intake cavity (203), and the air intake cavity (203) is connected to the open cavity. The laser (201) and the detector (202) are arranged at the same end of the optical assembly; The optical components include an incident sealing window (208), an exit sealing window (211), and several secondary hollow roof prisms, with the main hollow roof prism (302) and the secondary hollow roof prisms arranged opposite to each other. Both the main hollow roof prism (302) and the secondary hollow roof prism are composed of two mirrors assembled opposite each other; The mirror surfaces of the two reflectors in the main hollow roof prism (302) and the secondary hollow roof prism are arranged at a 90° angle to each other. The number of the secondary hollow ridge prisms is two, and the bonding surfaces (500) of the two secondary hollow ridge prisms are 90° to the bonding surface (500) of the main hollow ridge prism (302). It also includes a housing (200), which covers the outer periphery of the laser (201), detector (202), optical components and air intake cavity (203) of the plurality of measurement units. The air intake cavity (203) is provided with a mounting part (205) at the connection between it and the open cavity. The open cavity is located outside the housing (200), and the bottom wall of the housing (200) is sealed by the mounting part (205). The housing (200) has an air extraction port (215) on the wall surface of the mounting part (205). The top of the housing (200) is provided with a vent (217); The air intake chamber (203) is connected to a gas pipe (214).

2. The optical sensor for measuring gas components in a mixing device according to claim 1, characterized in that, The incident beam (401) is reflected by the main hollow roof prism (302) to form a first reflected beam (402). The intersection line (304) of the two reflecting mirrors of the main hollow roof prism (302) is perpendicular to the plane formed by the incident beam (401) and the first reflected beam (402).

3. The optical sensor for measuring gas components in a mixing device according to claim 2, characterized in that, The optical component is sealed to the air intake cavity (203) via a first base (207), and the optical component is embedded in the first base (207); The incident sealing window (208) and the exit sealing window (211) are both sealed and embedded in the first base (207).

4. The optical sensor for measuring gas components in a mixing device according to claim 1, characterized in that, The open cavity is composed of an inner mesh cylinder (300); The main hollow ridge prism (302) is fixed to the end of the open cavity by the second base (301), and the main hollow ridge prism (302) is embedded in the second base (301).

5. The optical sensor for measuring gas components in a mixing device according to claim 1, characterized in that, The measuring unit also includes a heat sink (204), and the laser (201) and the detector (202) are mounted side by side on the heat sink (204); The optical components also include a mirror group, which includes two mirrors and is respectively paired with the laser (201) and the detector (202).

6. The optical sensor for measuring gas components in a mixing device according to claim 5, characterized in that, The measuring unit also includes a branch air cooling plate (213), which is disposed on top of a plurality of arranged heat sinks (204) and communicates with a vent (217).

7. The optical sensor for measuring gas components in a mixing device according to claim 1, characterized in that, The measuring unit also includes an outer mesh cylinder (303), which covers the outer periphery of the plurality of open cavities; The outer mesh cylinder (303) is a mesh cylinder composed of two layers of mesh, with the mesh diameter of the inner layer mesh being smaller than that of the outer layer mesh.

8. The optical sensor for measuring gas components in a mixing device according to claim 1, characterized in that, It also includes a mounting flange (103), which is sealed to the bottom wall of the housing (200), and the measuring unit is sealed and installed at the mounting location (101) of the mixing device (100) through the mounting flange (103), and the open cavity is located inside the mixing device (100); The installation location (101) is the sight glass or idle feeding port of the mixing device (100).

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