Hazardous chemical substance detection device for terahertz technology

Abstract

The utility model belongs to the technical field of detection, particularly relates to a hazardous chemical substance detection device for a terahertz technology, and aims to solve the problems that in an existing technical scheme, when a cuboid cavity is filled with hazardous gas, no corresponding air pressure detection device exists, so that the air pressure cannot be controlled in the gas filling process, and the detection efficiency is high. According to the technical scheme, the hazardous gas detection device comprises a detection box, and the detection box comprises a first terahertz artificial surface plasma waveguide wall and a second terahertz artificial surface plasma waveguide wall; according to the utility model, after gas is conveyed into the two convex grooves, the gas pressure conveyed into the two convex grooves can be detected, and when hazardous gas is detected, the detected gas pressure can be ensured to be sufficient, so that the detection accuracy is improved, and the detection efficiency is improved. And deviation and problems during detection are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of terahertz wave technology applications, and particularly relates to a detection device for dangerous chemicals used in terahertz technology. Background Art

[0002] Terahertz waves refer to electromagnetic waves with a frequency of 0.1 - 10.0 THz (1 THz = 10^12 Hz). This frequency band is adjacent to the microwave band on the lower side and the infrared band on the upper side, possessing the advantages of both. It has better spatial resolution than microwaves and stronger penetrability than infrared rays. Terahertz waves have the characteristic of low photon energy (1 THz is approximately 4.1 meV) and will not produce ionization effects to damage organisms and biological tissues. The terahertz spectrum of substances themselves contains rich information. Since the vibration and rotation energy levels of chemical molecules such as hydrogen bonds, van der Waals forces, and dipole rotations between or within molecules correspond to the terahertz frequency band, especially many organic molecule energy levels are located in this band, making the molecules have unique fingerprint (absorption) spectra in the terahertz band. Relevant research on the THz absorption spectra of alkane hazardous gases such as methane, ethane, propane, and butane has proven that these hazardous gases have obvious fingerprint (absorption) spectra in the THz band, laying a solid foundation for qualitative and quantitative research on related technologies;

[0003] According to the patent with the publication number CN108020525B, a high-sensitivity terahertz spectrum detection device and method for hazardous gases are disclosed. This device mainly consists of an artificial surface plasmon waveguide filled with hazardous gases and a transmission terahertz time-domain spectroscopy device. Hazardous gases such as methane, ethane, and benzene volatiles have unique fingerprint absorption spectra in the terahertz band. This device utilizes the local enhancement effect of the artificial surface plasmon waveguide on terahertz waves to effectively improve the detection sensitivity of the terahertz absorption spectra of hazardous gases, and at the same time has characteristics such as short detection time and can work at room temperature. It can be widely used in the monitoring and early warning of specific hazardous gases during the production, application, transportation, loading, unloading, and storage of hazardous chemicals;

[0004] In the above technical solution, when injecting hazardous gases into a full cuboid cavity, there is no corresponding air pressure detection device, resulting in the inability to control the air pressure during the inflation process, affecting the accuracy of hazardous gas detection. Therefore, we propose a detection device for hazardous chemicals used in terahertz technology to solve the above-mentioned problems. Content of the Utility Model

[0005] The purpose of the utility model is to solve the defect that in the existing technical solution, when injecting hazardous gases into a full cuboid cavity, there is no corresponding air pressure detection device, resulting in the inability to control the air pressure during the inflation process and affecting the accuracy of hazardous gas detection, and to propose a detection device for hazardous chemicals used in terahertz technology.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A detection device for hazardous chemicals in terahertz technology, comprising a detection box, the detection box includes a first terahertz artificial surface plasmon waveguide wall and a second terahertz artificial surface plasmon waveguide wall, the first terahertz artificial surface plasmon waveguide wall is fixedly connected to the second terahertz artificial surface plasmon waveguide wall, convex grooves are provided on both sides of the first terahertz artificial surface plasmon waveguide wall and the second terahertz artificial surface plasmon waveguide wall that are close to each other, a first silicon lens and a second silicon lens are respectively arranged on both sides of the detection box, and the detection device further includes:

[0008] A pressure measurement mechanism, the pressure measurement mechanism penetrates through the top inner wall of the convex groove on the second terahertz artificial surface plasmon waveguide wall and is connected to the top inner wall of the convex groove, and the pressure measurement mechanism is used to detect the air pressure of the dangerous gas;

[0009] An air delivery mechanism, the air delivery mechanism is installed on the top of the second terahertz artificial surface plasmon waveguide wall, and the top of the pressure measurement mechanism extends into the air delivery mechanism and is connected to the inner wall of the air delivery mechanism.

[0010] In a possible design, the pressure measurement mechanism includes a moving tube that penetrates through the top inner wall of the convex groove on the second terahertz artificial surface plasmon waveguide wall and is slidably connected to the top inner wall of the convex groove, a pressure receiving plate is fixedly installed at the bottom end of the moving tube, the pressure receiving plate is in close sliding contact with the inner walls of the two convex grooves respectively, the top of the moving tube extends into the air delivery mechanism and is connected to the inner wall of the air delivery mechanism, two test components are symmetrically installed on the top of the pressure receiving plate, and the top of the test components extends above the second terahertz artificial surface plasmon waveguide wall and is connected to the top of the second terahertz artificial surface plasmon waveguide wall.

[0011] In a possible design, a jacking groove is provided on the bottom inner wall of the convex groove on the first terahertz artificial surface plasmon waveguide wall, and the jacking groove corresponds to the moving tube.

[0012] In a possible design, the test component includes a top rod fixedly installed on the top of the pressure receiving plate, a fixed frame is fixedly installed on the top of the second terahertz artificial surface plasmon waveguide wall, the top end of the top rod extends into the fixed frame and is fixedly installed with a pressure plate, and a pressure sensor is fixedly installed on the top inner wall of the fixed frame, and the pressure plate is used to apply pressure to the pressure sensor.

[0013] In a possible design, a tension spring is sleeved on the top rod and is located inside the fixed frame, and the top end and the bottom end of the tension spring are respectively fixedly connected to the bottom of the pressure plate and the top of the second terahertz artificial surface plasmon waveguide wall.

[0014] In a possible design, the gas transmission mechanism includes an installation pipe fixedly installed at the top of the wall of the second terahertz artificial surface plasmon waveguide. The top of the movable pipe extends into the installation pipe and is slidably connected to the inner wall of the installation pipe. A support pipe is fixedly installed at the top of the installation pipe, and a switching component is fixedly installed at the top of the support pipe. The switching component is used to connect to an external gas transmission pipeline.

[0015] In a possible design, the switching component includes a spherical cover fixedly installed at the top of the support pipe. A handle is rotatably connected through the inner wall of the top of the spherical cover. A ball core is fixedly installed at the bottom end of the handle. The ball core is in close fit with the inner wall of the spherical cover. Joint pipes are fixedly installed on both inner walls of the spherical cover. One end of each joint pipe extends to the outside of the spherical cover. An L-shaped hole is formed in the ball core.

[0016] In this application, after connecting the two joint pipes to the gas transmission pipelines on both sides respectively, the handle can be rotated to drive the ball core to rotate, so that the L-shaped hole communicates with the joint pipe connected to the intake pipeline. At this time, the dangerous gas can be transported into the installation pipe through the L-shaped hole, and then can be transported through the movable pipe to the jacking groove. After the air pressure below the pressure receiving plate increases, the two ejector rods can be driven to move upward, and then the two pressure plates can be driven to move upward until the pressure plates contact the corresponding pressure sensors. After the pressure sensors are stressed, when the pressure sensors are connected to an external display device, the pressure values received by the pressure sensors can be displayed, so as to detect the gas of the dangerous gas filled in the two convex grooves. In this way, when detecting the dangerous gas, it can be ensured that the air pressure is sufficient. When it is necessary to discharge the dangerous gas in the two convex grooves, the handle can be rotated to drive the ball core to rotate 180°, so that the L-shaped hole communicates with the joint pipe connected to the outlet pipeline. At this time, the dangerous gas can be discharged. And when the dangerous gas is discharged, the air pressure below the pressure receiving plate will decrease. At this time, the stretched spring in the stressed state can pull the ejector rod downward to drive the pressure receiving plate downward, so as to facilitate the discharge of the dangerous gas through the movable pipe.

[0017] Beneficial effects:

[0018] In the present utility model, for the detection device for dangerous chemicals using terahertz technology, through the pressure measurement mechanism, after the dangerous gas is transported into the movable pipe through the gas transmission mechanism, the air pressure below the pressure receiving plate will gradually increase, so as to jack up the pressure receiving plate, enabling the two test components to operate, and thus the air pressure of the dangerous gas can be detected;

[0019] In the present utility model, for the detection device of hazardous chemicals for terahertz technology, through the gas transmission mechanism, after connecting the switching component with two groups of pipelines for externally conveying gas, at this time, hazardous gas can be conveyed into the installation pipe, and the switching component can adjust and switch the flow direction of the hazardous gas so as to convey the hazardous gas.

[0020] After the present utility model conveys the gas into the two convex grooves, it can detect the air pressure conveyed into the two convex grooves, so that when detecting the hazardous gas, it can ensure that the detected air pressure is sufficient and avoid deviation and problems during detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional top view structure diagram of a detection device for hazardous chemicals for terahertz technology proposed by the present utility model;

[0022] Figure 2 is a three-dimensional cross-sectional view structure diagram of a detection device for hazardous chemicals for terahertz technology proposed by the present utility model;

[0023] Figure 3 is a three-dimensional front view structure diagram of a detection device for hazardous chemicals for terahertz technology proposed by the present utility model.

[0024] In the figure: 1, the first terahertz artificial surface plasmon waveguide wall; 2, the second terahertz artificial surface plasmon waveguide wall; 3, the first silicon lens; 4, the second silicon lens; 5, the convex groove; 6, the pressure receiving plate; 7, the jacking groove; 8, the moving pipe; 9, the installation pipe; 10, the support pipe; 11, the spherical cover; 12, the spherical core; 13, the handle; 14, the L-shaped hole; 15, the joint pipe; 16, the ejector rod; 17, the pressing plate; 18, the fixing frame; 19, the pressure sensor; 20, the tension spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] Embodiment 1

[0027] Referring to Figures 1 - 3 , a detection device includes a detection box, which is mainly composed of the first terahertz artificial surface plasmon waveguide wall 1 and the second terahertz artificial surface plasmon waveguide wall 2. These two waveguide walls are fixedly connected, and convex grooves 5 are respectively opened on their mutually close sides. The first silicon lens 3 and the second silicon lens 4 are respectively arranged on both sides of the detection box for guiding the propagation of terahertz waves.

[0028] The core of this device lies in its pressure measuring mechanism. The pressure measuring mechanism penetrates through the top inner wall of the convex groove 5 located on the second terahertz artificial surface plasmon waveguide wall 2 and is connected to this inner wall. The main function of the pressure measuring mechanism is to detect the air pressure of dangerous gases. When dangerous gases enter the convex groove 5 through the gas transmission mechanism, the pressure measuring mechanism can sense the change in air pressure and conduct corresponding detections.

[0029] Specifically, the pressure measuring mechanism includes a moving tube 8. This moving tube 8 penetrates through the top inner wall of the convex groove 5 and is slidably connected to the inner wall. A pressure receiving plate 6 is fixedly installed at the bottom end of the moving tube 8. This pressure receiving plate 6 is in close sliding contact with the inner walls of the two convex grooves 5. When dangerous gases enter the convex groove 5 and accumulate below the pressure receiving plate 6, the air pressure will gradually increase, thereby pushing the pressure receiving plate 6 to move upward. This movement will drive the moving tube 8 to move upward together, and then trigger the subsequent test components to work.

[0030] The top of the test component extends above the second terahertz artificial surface plasmon waveguide wall 2 and is connected to the top of the waveguide wall. When the pressure receiving plate 6 moves upward, the test component will start to operate to detect the air pressure of the dangerous gas. This detection method is direct and efficient and can accurately reflect the air pressure situation of the dangerous gas.

[0031] In addition, a jacking groove 7 is opened on the bottom inner wall of the convex groove 5 located on the first terahertz artificial surface plasmon waveguide wall 1. This jacking groove 7 corresponds to the moving tube 8. When dangerous gases are transported through the moving tube 8, they will first enter the jacking groove 7 and then accumulate below the pressure receiving plate 6. This design can more effectively transport the dangerous gases below the pressure receiving plate 6, thereby more accurately triggering the operation of the pressure measuring mechanism.

[0032] The specific structure of the test component includes a top rod 16 fixedly installed on the top of the pressure receiving plate 6. A fixing frame 18 is fixedly installed on the top of the second terahertz artificial surface plasmon waveguide wall 2. The top end of the top rod 16 extends into the fixing frame 18 and a pressure plate 17 is fixedly installed. A pressure sensor 19 is fixedly installed on the top inner wall of the fixing frame 18. When the pressure plate 17 moves upward, it will exert pressure on the pressure sensor 19. When the top rod 16 moves upward along with the pressure receiving plate 6, it will drive the pressure plate 17 to move upward together. When the pressure plate 17 moves to the position where it exerts pressure on the pressure sensor 19, the pressure sensor 19 will sense the change in pressure and display the corresponding pressure value through an external display device. In this way, the air pressure situation of the dangerous gas can be judged by observing the pressure value on the display device.

[0033] To ensure that the test component can return to its initial state after detection, a tension spring 20 is also sleeved on the ejector rod 16 of this device. This tension spring 20 is located within the fixed bracket 18, and its top and bottom ends are respectively fixedly connected to the bottom of the pressing plate 17 and the top of the second terahertz artificial surface plasmon waveguide wall 2. When it is necessary to discharge the dangerous gas within the convex groove 5, the tension spring 20 will use its elastic force to pull the ejector rod 16 downward, thereby driving the pressure-receiving plate 6 downward. In this way, the dangerous gas can be conveniently discharged through the moving pipe 8.

[0034] The gas transmission mechanism is another important component of this device. It mainly includes an installation pipe 9 fixedly installed at the top of the second terahertz artificial surface plasmon waveguide wall 2. The top of the moving pipe 8 extends into the installation pipe 9 and is slidably connected to the inner wall of the installation pipe 9. A support pipe 10 is fixedly installed at the top of the installation pipe 9, and a switching component is fixedly installed at the top end of the support pipe 10. The switching component is used to connect to an external gas transmission pipeline to achieve the transmission and flow direction switching of the dangerous gas.

[0035] The specific structure of the switching component includes a spherical cover 11 fixedly installed at the top end of the support pipe 10. A handle 13 is rotatably connected through the inner wall at the top of the spherical cover 11. A ball core 12 is fixedly installed at the bottom end of the handle 13. This ball core 12 is in close fit with the inner wall of the spherical cover 11, ensuring the gas tightness. A joint pipe 15 is fixedly installed on each of the two inner walls of the spherical cover 11. One end of each of these two joint pipes 15 extends to the outside of the spherical cover 11, facilitating connection to an external pipeline. An L-shaped hole 14 is provided on the ball core 12.

[0036] This application can be used in the technical field of terahertz wave technology applications, and can also be used in other fields applicable to this application.

[0037] Embodiment 2

[0038] Reference Figure 2 , on the basis of Embodiment 1, an improvement is made: A detection device for hazardous chemicals used in terahertz technology, which is applied to the technical field of terahertz wave technology applications. The specific structure of the switching component includes a spherical cover 11 fixedly installed at the top end of the support pipe 10. A handle 13 is rotatably connected through the inner wall at the top of the spherical cover 11. A ball core 12 is fixedly installed at the bottom end of the handle 13. This ball core 12 is in close fit with the inner wall of the spherical cover 11, ensuring the gas tightness. A joint pipe 15 is fixedly installed on each of the two inner walls of the spherical cover 11. One end of each of these two joint pipes 15 extends to the outside of the spherical cover 11, facilitating connection to an external pipeline. An L-shaped hole 14 is provided on the ball core 12, which can conveniently transport the dangerous gas into or discharge it from the two convex grooves 5.

[0039] However, as is well known to those skilled in the art, the working principle and wiring method of the pressure sensor 19 are common knowledge, which all belong to conventional means or well-known common sense, and will not be elaborated here. Those skilled in the art can make arbitrary selections according to their needs or convenience.

[0040] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent replacements or changes, should be covered within the protection scope of the present utility model.

Claims

1. A detection device for hazardous chemicals in terahertz technology, comprising a detection box, the detection box includes a first terahertz artificial surface plasmon waveguide wall (1) and a second terahertz artificial surface plasmon waveguide wall (2), the first terahertz artificial surface plasmon waveguide wall (1) is fixedly connected to the second terahertz artificial surface plasmon waveguide wall (2), convex grooves (5) are formed on one side of the first terahertz artificial surface plasmon waveguide wall (1) and the second terahertz artificial surface plasmon waveguide wall (2) that are close to each other, a first silicon lens (3) and a second silicon lens (4) are respectively arranged on both sides of the detection box, and it is characterized in that, The detection device also includes: A pressure measuring mechanism, the pressure measuring mechanism penetrates the top inner wall of the convex groove (5) located on the second terahertz artificial surface plasma waveguide wall (2) and is connected to the top inner wall of the convex groove (5), and the pressure measuring mechanism is used to detect the gas pressure of the dangerous gas; A gas delivery mechanism is installed on the top of the second terahertz artificial surface plasma waveguide wall (2); the top of the pressure measuring mechanism extends into the gas delivery mechanism and is connected to the inner wall of the gas delivery mechanism.

2. The detection device for hazardous chemicals using terahertz technology according to claim 1, characterized in that, The pressure measuring mechanism comprises a moving tube (8) penetrating the top inner wall of a convex groove (5) located on the second terahertz artificial surface plasma waveguide wall (2) and being slidably connected to the top inner wall of the convex groove (5); a pressure plate (6) is fixedly mounted on the bottom end of the moving tube (8); the pressure plate (6) is in close sliding contact with the inner walls of the two convex grooves (5), respectively; the top of the moving tube (8) extends into the gas transmission mechanism and is connected to the inner wall of the gas transmission mechanism; two test assemblies are symmetrically mounted on the top of the pressure plate (6); the top of the test assemblies extends to the top of the second terahertz artificial surface plasma waveguide wall (2) and is connected to the top of the second terahertz artificial surface plasma waveguide wall (2).

3. The detection device for hazardous chemicals used in terahertz technology according to claim 2, characterized in that, A lifting groove (7) is provided on the bottom inner wall of the convex groove (5) located on the first terahertz artificial surface plasma waveguide wall (1), and the lifting groove (7) corresponds to the moving tube (8).

4. The detection device for hazardous chemicals used in terahertz technology according to claim 3, wherein The test assembly comprises a push rod (16) fixedly mounted on the top of a pressure plate (6); a fixing frame (18) is fixedly mounted on the top of the second terahertz artificial surface plasma waveguide wall (2); the top end of the push rod (16) extends to the fixing frame (18) where a pressure plate (17) is fixedly mounted; a pressure sensor (19) is fixedly mounted on the inner wall of the top of the fixing frame (18); and the pressure plate (17) is used to apply pressure to the pressure sensor (19).

5. The detection device for hazardous chemicals used in terahertz technology according to claim 4, characterized in that, The push rod (16) is sleeved with a tension spring (20) located in a fixing frame (18), and the top and bottom ends of the tension spring (20) are fixedly connected to the bottom of the pressing plate (17) and the top of the second terahertz artificial surface plasma waveguide wall (2), respectively.

6. The detection device for hazardous chemicals using terahertz technology according to claim 2, characterized in that, The gas transmission mechanism comprises a mounting tube (9) fixedly mounted on the top of the second terahertz artificial surface plasma waveguide wall (2); the top of the movable tube (8) extends into the mounting tube (9) and is slidably connected to the inner wall of the mounting tube (9); a support tube (10) is fixedly mounted on the top of the mounting tube (9); a switching component is fixedly mounted on the top of the support tube (10); the switching component is used to connect to an external gas transmission pipeline.

7. The detection device for hazardous chemicals using terahertz technology according to claim 6, characterized in that, The switching assembly comprises a spherical cover (11) fixedly mounted on the top of a support tube (10); a handle (13) is rotatably connected to the top inner wall of the spherical cover (11); a ball core (12) is fixedly mounted on the bottom end of the handle (13); the ball core (12) is tightly fitted to the inner wall of the spherical cover (11); joint pipes (15) are fixedly mounted on the inner walls of both sides of the spherical cover (11); one end of the joint pipe (15) extends to the outside of the spherical cover (11); and an L-shaped hole (14) is opened on the ball core (12).

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