Hollow optical fiber gas detection system

Abstract

The utility model discloses a hollow optical fiber gas detection system, which belongs to the technical field of gas detection and is characterized in that a remote controller is in signal connection with a plurality of light source modules through the Internet and wireless network equipment, light paths of the plurality of light source modules are jointly communicated with a coupler, and a light path of the coupler is connected with a phosgene chamber; the phosgene inlet chamber is hermetically communicated with one end of the vacuum chamber, the other end of the vacuum chamber is hermetically communicated with the phosgene outlet chamber, one end of the air inlet valve is hermetically communicated with internal pipelines of the phosgene inlet chamber and the vacuum chamber, a light path of the coupler is communicated with the hollow optical fiber through the phosgene inlet chamber and then connected with the phosgene outlet chamber, and a light path of the phosgene outlet chamber is connected with the collimator. A light path of the collimator is connected with a photoelectric detector which is in signal connection with a display module. The working redundancy of the light source modules is ensured through the remote controller and the plurality of light source modules, the stable working of the light source modules is ensured through the distributed temperature sensors, and the rapid dispersion of the detected gas is realized through the diffusion pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a hollow optical fiber gas detection system. Background Art

[0002] In gas detection technology, there is a gas detection technology based on hollow-core fiber, which is a technical solution based on hollow-core fiber and gas sensing technology. This gas sensing detection system uses hollow-core fiber as a transmission medium and combines gas sensing technology to achieve measurement and detection of target gas.

[0003] In the hollow-core fiber gas sensing system, the sensing element is generally composed of a light source, a hollow-core fiber, a gas sensing layer and an optical detector. In the gas sensing layer, the target gas absorbs or scatters part of the light. The absorbed or scattered light is transmitted back to the optical detector through the hollow-core fiber for detection, thereby realizing the measurement of the target gas concentration. The system can achieve high-speed and high-precision gas measurement. Secondly, the system can work in harsh environments, such as high temperature, high pressure, strong electromagnetic interference, etc., so it has broad application prospects and can be applied to multiple fields, such as environmental monitoring, industrial process control, medical diagnosis, etc. For example, in environmental monitoring, the system can be used for air quality monitoring, emission monitoring, etc.; in industrial process control, the system can be used for gas monitoring and control of chemical reaction processes; in medical diagnosis, the system can be used for analysis and diagnosis of respiratory gases. In short, the hollow-core fiber gas sensing system is an advanced system based on hollow-core fiber and gas sensing technology, which has the advantages of high speed, high precision, strong adaptability, etc., and has broad application prospects in multiple fields.

[0004] However, in the existing hollow-core optical fiber-based gas sensing systems, such as the hollow-core optical fiber-based gas concentration detection device in the prior art CN116124696A, there is a problem that detection errors are prone to occur when there is a light source failure or high temperature instability. Utility Model Content

[0005] The utility model provides a hollow optical fiber gas detection system to solve the problem in the prior art that gas sensing systems based on hollow optical fibers are prone to errors when the light source fails or the high temperature is unstable.

[0006] On the one hand, an embodiment of the utility model provides a hollow optical fiber gas detection system, comprising: a remote controller, the remote controller is connected to a plurality of light source modules via the Internet and wireless network device signals, the optical paths of the plurality of light source modules are connected to a coupler together, the optical path of the coupler is connected to a phosgene inlet chamber, the phosgene inlet chamber is sealed to one end connected to a vacuum chamber, the other end of the vacuum chamber is sealed to a phosgene outlet chamber, one end of an air inlet valve simultaneously seals an internal pipeline connecting the phosgene inlet chamber and the vacuum chamber, the other end of the air inlet valve is sealed to an air inlet, the phosgene inlet chamber is connected to the phosgene outlet chamber, and the air inlet valve is sealed to an air inlet. The chamber is sealed and connected to a hollow-core optical fiber inside the vacuum chamber, and a plurality of micropores are arranged on the side of the hollow-core optical fiber. The phosgene outlet chamber is also sealed and connected to an outlet valve, and the outlet valve is a three-way valve. The outlet valve is also sealed and connected to the side of the vacuum chamber and one end of the vacuum pump, respectively. The other end of the vacuum pump is connected to an outlet. The optical path of the coupler is connected to the phosgene outlet chamber after being connected to the hollow-core optical fiber through the phosgene inlet chamber. The optical path of the phosgene outlet chamber is connected to a collimator, and the optical path of the collimator is connected to a photodetector. The photodetector signal is connected to a display module.

[0007] A plurality of temperature sensors are distributed on the light source module, and the plurality of temperature sensors are connected to a remote controller via the Internet and wireless network device signals.

[0008] In a possible implementation manner, the distribution positions of the multiple temperature sensors on each of the light source modules correspond to each other, and the multiple temperature sensors detect the temperature at the same position on the multiple light source modules.

[0009] In a possible implementation, the light source module controls the switch and power through the remote controller, the remote controller is arranged on a server in the cloud, and the remote controller detects and obtains the temperature value of the light source module through the temperature sensor.

[0010] In a possible implementation, the entire hollow-core optical fiber is coiled and placed inside the vacuum air chamber, and the microholes of the hollow-core optical fiber are arranged on the portion of the hollow-core optical fiber placed inside the vacuum air chamber.

[0011] In a possible implementation, the internal pipeline includes a delivery pipe and a diffusion pipe, a plurality of diffusion pipes are arranged in parallel on the delivery pipe, and a plurality of diffusion holes are evenly distributed on the diffusion pipe.

[0012] In a possible implementation, the length of the diffusion tube is set corresponding to the side length of the vacuum chamber.

[0013] In a possible implementation, the air inlet valve, the phosgene inlet chamber, the phosgene outlet chamber and the air outlet valve are all provided with pressure transmitters, and the pressure transmitters are connected to the remote controller via signals.

[0014] A hollow optical fiber gas detection system in the utility model has the following advantages:

[0015] (1) The working redundancy of the light source module is ensured through a remote controller and multiple light source modules.

[0016] (2) Ensure stable operation of the light source module through remote controller and distributed temperature sensors.

[0017] (3) The detected gas is quickly and evenly filled into the vacuum chamber and hollow optical fiber through the diffusion tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a hollow optical fiber gas detection system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Figure 1 A schematic diagram of the structure of a hollow-core optical fiber gas detection system provided in an embodiment of the utility model; an embodiment of the utility model provides a hollow-core optical fiber gas detection system, comprising:

[0022] A remote controller 1 is provided, wherein the remote controller 1 is connected to a plurality of light source modules 2 via the Internet and wireless network device signals, wherein the optical paths of the plurality of light source modules 2 are connected to a coupler 3 in common, wherein the optical path of the coupler 3 is connected to a phosgene inlet chamber 4, wherein the phosgene inlet chamber 4 is sealed and connected to one end of a vacuum chamber 7, wherein the other end of the vacuum chamber 7 is sealed and connected to a phosgene outlet chamber 8, wherein one end of an air inlet valve 5 simultaneously seals an internal pipeline connecting the phosgene inlet chamber 4 and the vacuum chamber 7, wherein the other end of the air inlet valve 5 is sealed and connected to an air inlet 6, wherein the phosgene inlet chamber 4 and the phosgene outlet chamber 8 are sealed and connected to a hollow optical fiber 71 in the vacuum chamber 7, A plurality of micropores are arranged on the side of the hollow optical fiber 71, and the phosphine outlet chamber 8 is also sealed and connected to an outlet valve 12, and the outlet valve 12 is a three-way valve, and the outlet valve 12 is also sealed and connected to the side of the vacuum chamber 7 and one end of the vacuum pump 13, respectively, and the other end of the vacuum pump 13 is connected to an outlet 14, and the optical path of the coupler 3 is connected to the phosphine outlet chamber 8 after passing through the phosphine inlet chamber 4 and connecting to the hollow optical fiber 71, and the optical path of the phosphine outlet chamber 8 is connected to a collimator 9, and the optical path of the collimator 9 is connected to a photodetector 10, and the signal of the photodetector 10 is connected to a display module 11;

[0023] A plurality of temperature sensors are distributed on the light source module 2, and the plurality of temperature sensors are connected to the remote controller 1 via the Internet and wireless network device signals. The air inlet valve 5, the light inlet gas chamber 4, the light outlet gas chamber 8 and the air outlet valve 12 are all provided with pressure transmitters, and the pressure transmitters are connected to the remote controller 1 via signals. The distribution positions of the plurality of temperature sensors on each of the light source modules 2 correspond to each other, and the plurality of temperature sensors detect the temperature at the same position on the plurality of light source modules 2. The light source module 2 controls the switch and power through the remote controller 1. The remote controller 1 is set on a server in the cloud, and the remote controller 1 obtains the temperature value of the light source module 2 through the temperature sensor detection.

[0024] Exemplarily, the remote controller 1 is set in the cloud, and the remote controller 1 controls the opening and closing of the light source module 2 during the detection, as well as the power size through the Internet. The remote controller 1 senses the working status of the light source module 2 through distributed temperature sensors set at various locations of the light source module 2, and monitors the light source module 2 through a threshold comparison method. When the temperature of the currently working light source module 2 fluctuates abnormally, the remote controller 1 remotely switches the light source module 2, deactivates the currently working light source module 2 and switches to the standby light source module 2. The light emitted by the light source module 2 passes through the coupler 3 on the side wall of the light inlet chamber 4 and is incident on the hollow optical fiber 71 inside the vacuum chamber 7. The main body of the hollow optical fiber 71 is placed in the hollow optical fiber 71, and the side of the hollow optical fiber 71 is covered with multiple micropores, and the gas to be tested passes through The air enters the system through the air inlet 6, and after passing through the air inlet valve 5, a part of it is directly input into the hollow-core optical fiber 71 through the light-inlet air chamber 4, and the other part is rapidly diffused into the interior of the vacuum air chamber 7 through the internal pipeline of the vacuum air chamber 7, and then enters the hollow-core optical fiber 71 through the micropores of the hollow-core optical fiber 71, so as to achieve the purpose of uniformly filling the hollow-core optical fiber 71 with the measured gas at the fastest speed. After the remote controller 1 obtains the pressure between the air inlet valve 5 and the air outlet valve 12 reaching a preset value through the pressure transmitter of the air inlet valve 5 and the air outlet valve 12, it controls the air inlet valve 5 to close, so that the air inlet valve 5 and the air outlet valve 12 become sealed. At this time, the laser of the light source module 2 passes through the hollow-core optical fiber 71, the light-outlet air chamber 8, and the collimator 9 in turn and enters the photoelectric detector 10, and the photoelectric detector 10 presents the detected readings through the display module 11.

[0025] In a possible embodiment, the hollow optical fiber 71 is coiled and placed as a whole inside the vacuum air chamber 7, and the micropores of the hollow optical fiber 71 are arranged on the portion of the hollow optical fiber 71 placed inside the vacuum air chamber 7. The internal pipeline includes a delivery pipe and a diffusion pipe. A plurality of diffusion pipes are arranged in parallel on the delivery pipe, and a plurality of diffusion holes are evenly distributed on the diffusion pipe. The length of the diffusion pipe is set corresponding to the side length of the vacuum air chamber 7.

[0026] Exemplarily, the internal pipeline of the vacuum air chamber 7 includes a delivery pipe and a diffusion pipe, and a plurality of the delivery pipes and the diffusion pipes are provided. The delivery pipes and the diffusion pipes are arranged perpendicular to each other, and a plurality of the diffusion pipes are arranged in parallel on each delivery pipe. The length of the diffusion pipe is set by reducing the side length of the vacuum air chamber 7 by 2 cm, so that the diffusion pipe can completely fill the entire internal space of the vacuum air chamber 7, and then the measured gas can be quickly and evenly diffused inside the vacuum air chamber 7 through the diffusion holes on the diffusion pipe.

[0027] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0028] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hollow optical fiber gas detection system, characterized in that: include: A remote controller (1), wherein the remote controller (1) is connected to a plurality of light source modules (2) via the Internet and wireless network device signals, the optical paths of the plurality of light source modules (2) are connected to a coupler (3), the optical path of the coupler (3) is connected to a phosgene inlet chamber (4), the phosgene inlet chamber (4) is sealed and connected to one end of a vacuum chamber (7), the other end of the vacuum chamber (7) is sealed and connected to a phosgene outlet chamber (8), one end of an air inlet valve (5) simultaneously seals an internal pipeline connecting the phosgene inlet chamber (4) and the vacuum chamber (7), the other end of the air inlet valve (5) is sealed and connected to an air inlet (6), the phosgene inlet chamber (4) and the phosgene outlet chamber (8) are sealed and connected to a hollow optical fiber (71) inside the vacuum chamber (7) , a plurality of micropores are arranged on the side of the hollow optical fiber (71), the phosphine gas outlet chamber (8) is also sealed and connected to an outlet valve (12), the outlet valve (12) is a three-way valve, the outlet valve (12) is also sealed and connected to the side of the vacuum chamber (7) and one end of the vacuum pump (13), the other end of the vacuum pump (13) is connected to an outlet (14), the optical path of the coupler (3) passes through the phosphine gas inlet chamber (4) and is connected to the hollow optical fiber (71) and then connected to the phosphine gas outlet chamber (8), the optical path of the phosphine gas outlet chamber (8) is connected to a collimator (9), the optical path of the collimator (9) is connected to a photodetector (10), and the signal of the photodetector (10) is connected to a display module (11); A plurality of temperature sensors are distributed on the light source module (2), and the plurality of temperature sensors are connected to the remote controller (1) via the Internet and wireless network device signals.

2. A hollow-core optical fiber gas detection system according to claim 1, characterized in that: The distribution positions of the plurality of temperature sensors on each of the light source modules (2) correspond to each other, and the plurality of temperature sensors detect the temperature at the same position on the plurality of light source modules (2).

3. A hollow-core optical fiber gas detection system according to claim 2, characterized in that: The light source module (2) controls the switch and power through the remote controller (1); the remote controller (1) is arranged on a server in the cloud; and the remote controller (1) detects and obtains the temperature value of the light source module (2) through the temperature sensor.

4. A hollow-core optical fiber gas detection system according to claim 1, characterized in that: The hollow-core optical fiber (71) is coiled and placed in its entirety inside the vacuum air chamber (7), and the microholes of the hollow-core optical fiber (71) are arranged on the portion of the hollow-core optical fiber (71) placed inside the vacuum air chamber (7).

5. A hollow-core optical fiber gas detection system according to claim 1, characterized in that: The internal pipeline includes a delivery pipe and a diffusion pipe. A plurality of diffusion pipes are arranged in parallel on the delivery pipe, and a plurality of diffusion holes are evenly distributed on the diffusion pipe.

6. A hollow-core optical fiber gas detection system according to claim 5, characterized in that: The length of the diffusion tube is set corresponding to the side length of the vacuum chamber (7).

7. A hollow-core optical fiber gas detection system according to claim 1, characterized in that: The air inlet valve (5), the phosgene inlet chamber (4), the phosgene outlet chamber (8) and the air outlet valve (12) are all provided with pressure transmitters, and the pressure transmitters are connected to the remote controller (1) via signals.

Images