Gas sensing system and method based on graphene side edge polishing FBG

Abstract

The invention relates to a graphene side edge polishing FBG (Fiber Bragg Grating) gas sensing system and a graphene side edge polishing FBG gas sensing method. The system comprises an amplified spontaneous emission light source, a polarization controller, an optical fiber coupler, a spectrum analyzer, a real-time demodulation system and at least one graphene side polishing FBG, the graphene side-polished FBG comprises single-layer graphene and a side-polished FBG obtained by polishing through a polishing device, wherein the single-layer graphene is used for tuning the central wavelength of the side-polished FBG; the amplified spontaneous emission light source is used for generating multi-path wide-spectrum light which is sequentially introduced into the polarization controller, the optical fiber coupler and the at least one graphene side polishing FBG; the polarization controller is used for tuning the polarization state of the wide-spectrum light so as to tune the loss of the graphene side polishing FBG; the spectrum analyzer is used for receiving the wide-spectrum light transmitted by the graphene side polishing FBG and analyzing the wide-spectrum light to obtain an analysis result; and the real-time demodulation system is used for acquiring the concentration of various to-be-detected gases based on the analysis result. By adopting the method, efficient and accurate detection of various gases can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of gas sensing based on graphene side-polished FBG, and in particular to a gas sensing system and method based on graphene side-polished FBG. Background Art

[0002] As one of the cutting-edge technologies in the current science and technology field, sensing technology is not only a key pillar of the modern information industry, but also an important engine to promote scientific and technological innovation and development. It has broad application prospects in all walks of life and is regarded as one of the most promising high-tech technologies at home and abroad. Among them, fiber optic sensing technology has rapidly emerged with its unique advantages. Its excellent anti-electromagnetic interference performance, superior sensing performance and high integration with optical fiber transmission systems have made it one of the emerging technologies that have attracted much attention in the field of science and technology. Sensing technology has been widely used in many fields such as smart Internet of Things and biochemical testing, and has continuously promoted technological innovation and the expansion of application fields.

[0003] Among them, optical fiber gas sensors based on graphene side-polished FBG, as an important branch of optical fiber sensing technology, show unique advantages in the field of gas sensing based on graphene side-polished FBG. Compared with traditional electrochemical gas sensors based on graphene side-polished FBG, optical fiber gas sensors based on graphene side-polished FBG have faster response speed and higher sensitivity. Its precise gas detection capability and efficient data transmission give it broad application prospects in environmental monitoring, industrial safety, medical diagnosis and other fields. Its reliability, real-time performance and adaptability to complex environments provide strong support for solving many challenges in the real world. However, traditional optical fiber gas sensors based on graphene side-polished FBG have problems such as insufficient sensitivity, difficulty in multi-gas detection and complex operation in practical applications.

[0004] Therefore, there is an urgent need for a gas sensing system and method based on graphene side-polished FBG that can achieve efficient and accurate detection of multiple gases. Summary of the invention

[0005] Based on this, it is necessary to provide a gas sensing system and method of graphene side-polished FBG that can achieve efficient and accurate detection of multiple gases in response to the above technical problems.

[0006] In a first aspect, the present application provides a gas sensing system based on graphene side-polished FBG, comprising:

[0007] The system includes an amplified spontaneous emission light source, a polarization controller, a fiber coupler, a spectrum analyzer, a real-time demodulation system and at least one graphene side-polished FBG;

[0008] The graphene side-polished FBG comprises a single-layer graphene and a side-polished FBG polished by a polishing device, wherein the single-layer graphene is used to tune the central wavelength of the side-polished FBG;

[0009] The amplified spontaneous emission light source is used to generate multi-path broadband light which is sequentially passed into the polarization controller, the optical fiber coupler and at least one of the graphene side-polished FBGs;

[0010] The polarization controller is used to tune the polarization state of the broadband light to tune the loss of the graphene side-polished FBG;

[0011] The spectrum analyzer is used to receive the broad spectrum light transmitted by the graphene side edge polishing FBG and analyze it to obtain the analysis result;

[0012] The real-time demodulation system is used to obtain the concentrations of multiple gases to be measured based on the analysis results.

[0013] In one embodiment, the laser effective area of ​​the side-polished FBG and the single-layer graphene is 2×10 -8 m 2 -8×10 -8 m 2 within the range.

[0014] In one embodiment, the real-time demodulation system is specifically used for:

[0015] According to the analysis result, the position of the central wavelength of the broad-spectrum light is obtained; according to the position of the central wavelength, the drift of the central wavelength is calculated; according to the drift of the central wavelength, the concentration of the gas to be measured is calculated.

[0016] In one of the embodiments, the central wavelength of the side-polished FBG is in the range of 550nm-1570nm, and the transmission bandwidth of the side-polished FBG is 1nm.

[0017] In one of the embodiments, the polishing area depth of the side-polished FBG is in the range of 50 μm-60 μm.

[0018] In one embodiment, the broad-spectrum light generated by the amplified spontaneous emission light source has a wavelength in the range of 1525 nm to 1575 nm.

[0019] In one embodiment, the polishing device includes an optical fiber fixing device, a polishing grinding wheel, a grinding wheel driving motor and a three-dimensional diameter measurement platform.

[0020] In one embodiment, the polishing area length of the side-polished FBG is 2 cm.

[0021] In a second aspect, the present application also provides a gas sensing method based on graphene side-polished FBG, the method comprising:

[0022] Polishing the side of a single-mode FBG using a polishing device to obtain a side-polished FBG, attaching a single-layer graphene to the side region of the side-polished FBG to obtain a graphene side-polished FBG, so that the single-layer graphene tunes the central wavelength of the side-polished FBG;

[0023] Passing the broad-spectrum light generated by the amplified spontaneous emission light source into the polarization controller, the optical fiber coupler and at least one of the graphene side-polished FBGs in sequence;

[0024] Tuning the polarization state of the broadband light to tune the loss of the graphene side-polished FBG;

[0025] receiving and analyzing the broad-spectrum light transmitted by the graphene side-edge polished FBG to obtain an analysis result;

[0026] The concentrations of multiple gases to be measured are obtained based on the analysis results.

[0027] In one embodiment, the step of obtaining the concentrations of multiple gases to be measured based on the analysis results includes:

[0028] According to the analysis result, obtaining the position of the central wavelength of the broadband light;

[0029] According to the position of the central wavelength, the drift amount of the central wavelength is calculated;

[0030] The concentration of the gas to be measured is calculated according to the drift of the central wavelength.

[0031] The gas sensing system and method of the graphene side-polished FBG above utilize the gas molecule adsorption ability of graphene and the optical properties of the fiber Bragg grating (FBG) to achieve high-sensitivity detection of gas molecules. The system can monitor multiple gases at the same time, and analyze the drift of different FBG center wavelengths through the real-time demodulation system to achieve real-time sensing of multiple gases. By simplifying the operation process and system integration, the entire sensing system is easy to operate and integrate. The combination of graphene and FBG reduces the material and production costs, making the sensing system more economical. The system design takes into account the integration level and is convenient for use with other systems or equipment. Using an amplified spontaneous emission source (ASE) and a spectrometer, the system can monitor gas concentration changes in real time. By tuning the center wavelength of the FBG, the system can distinguish different types of gases and improve the selectivity of detection. The adsorption of gas molecules by graphene quickly changes its Fermi level, thereby quickly tuning the center wavelength of the FBG to achieve a fast response. Due to the small size of graphene and FBG, the volume of the entire sensing system is also reduced accordingly, which is easy to carry and deploy. The system design takes into account the adaptability to complex environments, enabling it to work stably in a variety of environments. Using at least one graphene side-polished FBG ensures efficient and accurate data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] FIG1 is a test system diagram of a gas sensing system based on graphene side-polished FBG in one embodiment;

[0034] FIG2 is a schematic diagram of a three-dimensional structure of a graphene side-polished FBG device in one embodiment;

[0035] FIG3 is a transmission spectrum diagram of a graphene side-polished FBG device in one embodiment;

[0036] FIG4 is a graph showing the response of the central wavelength of a graphene side-polished FBG device to gas concentration in one embodiment;

[0037] FIG5 is a schematic diagram of a process of a gas sensing method based on graphene side-polished FBG in one embodiment;

[0038] FIG. 6 is a diagram showing the internal structure of a computer device in one embodiment.

[0039] Figure numerals: 1. single-mode optical fiber; 2. single-mode FBG; 3. D-type polished area; 4. single-layer graphene; 5. ASE light source; 6. polarization controller; 7. optical fiber coupler; 8. first graphene side-polished FBG device; 9. second graphene side-polished FBG device; 10. third graphene side-polished FBG device; 11. spectrum analyzer; 12. real-time demodulation system. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] The gas sensing system based on graphene side-polished FBG provided in the embodiment of the present application comprises an amplified spontaneous radiation light source, a polarization controller, a fiber coupler, a spectrum analyzer, a real-time demodulation system and at least one graphene side-polished FBG;

[0042] The graphene side-polished FBG comprises a single-layer graphene and a side-polished FBG polished by a polishing device, wherein the single-layer graphene is used to tune the central wavelength of the side-polished FBG;

[0043] The amplified spontaneous emission light source is used to generate multi-path broadband light which is sequentially passed into the polarization controller, the optical fiber coupler and at least one graphene side-polished FBG;

[0044] The polarization controller is used to tune the polarization state of broadband light to tune the loss of graphene side-polished FBG;

[0045] The spectrum analyzer is used to receive the broad spectrum light transmitted by the graphene side-polished FBG and analyze it to obtain the analysis results;

[0046] The real-time demodulation system is used to obtain the concentrations of multiple gases to be measured based on the analysis results.

[0047] In one embodiment, the laser effective area of ​​the side-polished FBG and the single-layer graphene is 2×10 -8 m 2 -8×10 -8 m 2 within the range.

[0048] In one of the embodiments, the real-time demodulation system is specifically used to: obtain the position of the central wavelength of the wide-spectrum light according to the analysis results; calculate the drift of the central wavelength according to the position of the central wavelength; and calculate the concentration of the gas to be measured according to the drift of the central wavelength.

[0049] In one embodiment, the central wavelength of the side-polished FBG is in the range of 550 nm-1570 nm, and the transmission bandwidth of the side-polished FBG is 1 nm.

[0050] In one embodiment, the polished area depth of the side-polished FBG is in the range of 50 μm-60 μm.

[0051] In one embodiment, the wavelength of the broad spectrum light generated by the amplified spontaneous emission light source is in the range of 1525nm-1575nm.

[0052] In one embodiment, the polishing device includes an optical fiber fixing device, a polishing grinding wheel, a grinding wheel driving motor and a three-dimensional diameter measurement platform.

[0053] In one embodiment, the length of the polishing area of ​​the side-polished FBG is 2 cm.

[0054] The most detailed embodiment of this application is:

[0055] As shown in FIG. 1 , FIG. 1 is a test system diagram of a gas sensing system based on graphene side-polished FBG, wherein the wavelength range of the amplified spontaneous emission light source (ASE light source 5) is 1525 nm-1575 nm, and the FBG is a single-mode FBG.

[0056] As shown in FIG2 , the side surfaces of the single-mode optical fiber 1 and the single-mode FBG 2 are polished by using an optical fiber fixing device, a polishing grinding wheel, a grinding wheel driving motor, and a three-dimensional diameter measurement platform to obtain a side-polished FBG; wherein the polishing depth of the D-shaped polishing area 3 is about 60 μm, and the length of the D-shaped polishing area 3 is about 2 cm. The single-layer graphene 4 is transferred to the D-shaped polishing area 3 by wet transfer technology, wherein the laser effective area of ​​the side-polished FBG and the single-layer graphene 4 is 2×10 -8 m 2 -8×10 -8 m 2 In the range of 7×10-8m 2 , and finally the preparation of graphene side-polished FBG device is completed.

[0057] In conjunction with FIG2 , a single-mode FBG2 with different central wavelengths is selected as the initial device. After the above operations, a first graphene side-polished FBG device 8, a second graphene side-polished FBG device 9 and a third graphene side-polished FBG device 10 are respectively prepared, and a fiber optic gas sensing system is formed through a fiber optic coupler 7. The prepared fiber optic gas sensing system is placed in an environment where gas sensing is required, and the wide-spectrum light generated by the ASE light source 5 is injected into the first graphene side-polished FBG device 8, the second graphene side-polished FBG device 9 and the third graphene side-polished FBG device 10 respectively after passing through a polarization controller 6 and a fiber optic coupler 7. Among them, the polarization controller 6 can tune the polarization state of the laser to tune the loss in each graphene side-polished FBG device. According to the transmission characteristics of the FBG, only light within its transmission bandwidth can pass through, and the center wavelength and transmission bandwidth of each graphene side-polished FBG device are different. Therefore, the wide-spectrum light transmitted by the multi-path graphene side-polished FBG device can be directly introduced into the spectrum analyzer 11, and finally the central wavelength of each signal is demodulated and quickly calculated in real time through the real-time demodulation system 12, so as to obtain multiple gas concentrations.

[0058] As shown in FIG. 3 , it is a transmission spectrum diagram of the first graphene side-polished FBG device 8 in this embodiment driven by the ASE light source 5 . It can be seen that the central wavelength is 1566.9 nm and the bandwidth is about 1 nm.

[0059] When the optical fiber gas sensing system is used for gas sensing, gas molecules will be adsorbed onto the single-layer graphene 4 in the D-shaped polished area 3 of each graphene side-polished FBG device, and the complex effective refractive index of the single-layer graphene 4 will change accordingly, thereby changing the central wavelength of the side-polished FBG. Since different gas types and different gas concentrations change the central wavelength of the FBG by different amounts, gas sensing is achieved.

[0060] In this embodiment, real-time sensing of multiple components of three gases can be achieved. Figure 4 records the corresponding relationship between the gas concentration and the central wavelength of the FBG when the first graphene side-polished FBG device 8 senses a certain gas, and it can be seen that its response is a linear change. Since each FBG device cross-responds to the three gases at the same time, the specific concentrations of the three gases in the gas sensing environment can be obtained by real-time demodulation and calculation of the linear equation group. Accordingly, for complex gas environments with more components, the number of FBG devices can be increased to solve the concentration of each gas by solving the linear equation.

[0061] It can be seen from the above embodiments that the present invention combines graphene with FBG, and uses a new structure to realize a new type of fiber optic gas sensing system that is low-cost, easy to operate, and easy to integrate, and can realize simultaneous demodulation of multiple gases. The present invention combines two-dimensional material optoelectronics, fiber microstructure processing technology, FBG central wavelength control principle and gas sensing technology to solve the problems of low integration, complex operation, and inability to detect multiple gases simultaneously in existing fiber optic gas sensing systems. It has the advantages of low cost, simple operation, small size, and easy integration. It is suitable for various complex gas sensing fields such as environmental monitoring and power equipment detection, and has made contributions to further exploring gas sensing systems with higher integration in the field of complex gas sensing.

[0062] Each module in the above-mentioned gas sensing system based on graphene side-polished FBG can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0063] Based on the same inventive concept, the embodiment of the present application also provides a gas sensing method based on graphene side-polished FBG for realizing the above-mentioned gas sensing system based on graphene side-polished FBG. The implementation scheme for solving the problem provided by the method is similar to the implementation scheme recorded in the above-mentioned system, so the specific limitations of one or more embodiments of the gas sensing method based on graphene side-polished FBG provided below can be referred to the above limitations on the gas sensing system based on graphene side-polished FBG, and will not be repeated here.

[0064] In an exemplary embodiment, as shown in FIG5 , the present application further provides a gas sensing method based on graphene side-polished FBG, the method comprising:

[0065] Step S502, using a polishing device to polish the side of a single-mode FBG to obtain a side-polished FBG, attaching a single-layer graphene to the side region of the side-polished FBG to obtain a graphene side-polished FBG, so that the single-layer graphene tunes the central wavelength of the side-polished FBG;

[0066] Step S504, passing the broad-spectrum light generated by the amplified spontaneous emission light source into the polarization controller, the optical fiber coupler and at least one graphene side-polished FBG in sequence;

[0067] Step S506, tuning the polarization state of the broadband light to tune the loss of the graphene side-polished FBG;

[0068] Step S508, receiving and analyzing the broad spectrum light transmitted by the graphene side edge polishing FBG to obtain an analysis result;

[0069] Step S510, obtaining concentrations of multiple gases to be measured based on the analysis results.

[0070] Specifically, the side edge of the single-mode FBG is polished by a polishing device, that is, the side edge of the single-mode FBG is polished by a physical method to form a specific structure, that is, a side-polished FBG.

[0071] Attaching the single-layer graphene to the side region of the side-polished FBG is to precisely place or transfer the single-layer graphene material to a specific region of the side-polished FBG.

[0072] The single-layer graphene can tune the central wavelength of the side-polished FBG. The introduction of graphene can change the optical properties of FBG, especially the central wavelength, because graphene affects the refractive index of light.

[0073] The broad spectrum light generated by the amplified spontaneous emission light source is sequentially passed through the polarization controller and the fiber coupler, and the light generated by the broad spectrum light source is processed and transmitted through a series of devices. The processed light is finally sent to at least one graphene side-polished FBG for the next step of optical interaction.

[0074] The polarization state of broadband light is tuned to tune the loss of graphene side-polished FBG. By adjusting the polarization state of light, the interaction between light and FBG can be changed, thereby adjusting the loss characteristics of FBG.

[0075] The light transmitted or reflected by FBG contains gas sensing information, which can be analyzed by a spectrometer. The analysis results usually include information such as the wavelength and intensity of the light, which is related to the change in the central wavelength of FBG. By analyzing the change in the central wavelength of FBG, the type and concentration of the gas can be inferred. This is because different gas molecules interact with graphene, resulting in specific changes in the central wavelength of FBG.

[0076] In the above-mentioned gas sensing system based on graphene side-polished FBG, the gas molecule adsorption ability of graphene is combined with the optical properties of fiber Bragg grating (FBG) to achieve high-sensitivity detection of gas molecules. The system can monitor multiple gases at the same time, and analyze the drift of different FBG center wavelengths through the real-time demodulation system to achieve real-time sensing of multiple gases. By simplifying the operation process and system integration, the entire sensing system is easy to operate and integrate. The combination of graphene and FBG reduces the material and production costs, making the sensing system more economical. The system design takes into account the integration level and is easy to use with other systems or equipment. Using an amplified spontaneous emission source (ASE) and a spectrometer, the system can monitor gas concentration changes in real time. By tuning the center wavelength of FBG, the system can distinguish different types of gases and improve the selectivity of detection. The adsorption of gas molecules by graphene quickly changes its Fermi level, thereby quickly tuning the center wavelength of FBG to achieve rapid response. Due to the small size of graphene and FBG, the volume of the entire sensing system is also reduced accordingly, making it easy to carry and deploy. The system design takes into account the adaptability to complex environments, enabling it to work stably in a variety of environments. Using at least one graphene side-polished FBG ensures efficient and accurate data transmission.

[0077] In an exemplary embodiment, the concentrations of multiple gases to be measured are obtained based on the analysis results, including:

[0078] According to the analysis result, the position of the central wavelength of the broad spectrum light is obtained;

[0079] According to the position of the central wavelength, the drift of the central wavelength is calculated;

[0080] The concentration of the gas to be measured is calculated based on the drift of the central wavelength.

[0081] Specifically, in spectral analysis, the central wavelength of broadband light refers to the strongest or most obvious wavelength in the spectrum. The position of this central wavelength can be determined by receiving the light transmitted by the graphene side-polished FBG through a spectrum analyzer. The position of this central wavelength is closely related to the optical properties of the FBG and the presence of gas. The drift of the central wavelength refers to the change in the central wavelength of the FBG due to the interaction between gas molecules and graphene under different gas environments. The drift can be calculated by comparing the currently measured central wavelength with the central wavelength in the initial state. This drift reflects the influence of the gas. Different gases have different effects on graphene, so the drift of the central wavelength can be used to infer the concentration of the gas. By establishing a mathematical model or empirical formula to quantify the relationship between the drift and the gas concentration, the concentration value of the gas to be measured can be obtained.

[0082] In this embodiment, the characteristic change of light (central wavelength) is obtained through spectral analysis, and then the concentration of the gas is inferred. It utilizes the superior performance of optical fiber sensing technology and graphene to achieve efficient and real-time monitoring of gas concentration. This method has the advantages of high sensitivity and fast response, and is suitable for the detection of various gases.

[0083] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0084] In an exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be shown in FIG6. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected via a system bus, and the communication interface, the display unit, and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner may be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, a gas sensing system based on graphene side-polished FBG is implemented. The display unit of the computer device is used to form a visually visible picture, and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or a key, trackball, or touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse, etc.

[0085] Those skilled in the art will understand that the structure shown in FIG. 6 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0086] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0087] A side-polished FBG is obtained by polishing the side of a single-mode FBG using a polishing device, and a single-layer graphene is attached to the side region of the side-polished FBG to obtain a graphene side-polished FBG, so that the single-layer graphene tunes the central wavelength of the side-polished FBG;

[0088] The broad spectrum light generated by the amplified spontaneous emission light source is sequentially passed into the polarization controller, the optical fiber coupler and at least one graphene side-polished FBG;

[0089] Tuning the polarization state of broadband light to tune the loss of graphene side-polished FBG;

[0090] Receive and analyze the broad spectrum light transmitted by the graphene side-polished FBG to obtain analysis results;

[0091] The concentrations of various gases to be measured are obtained based on the analysis results.

[0092] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0093] According to the analysis result, the position of the central wavelength of the broad spectrum light is obtained;

[0094] According to the position of the central wavelength, the drift of the central wavelength is calculated;

[0095] The concentration of the gas to be measured is calculated based on the drift of the central wavelength.

[0096] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0097] A side-polished FBG is obtained by polishing the side of a single-mode FBG using a polishing device, and a single-layer graphene is attached to the side region of the side-polished FBG to obtain a graphene side-polished FBG, so that the single-layer graphene tunes the central wavelength of the side-polished FBG;

[0098] The broad spectrum light generated by the amplified spontaneous emission light source is sequentially passed into the polarization controller, the optical fiber coupler and at least one graphene side-polished FBG;

[0099] Tuning the polarization state of broadband light to tune the loss of graphene side-polished FBG;

[0100] Receive and analyze the broad spectrum light transmitted by the graphene side-polished FBG to obtain analysis results;

[0101] The concentrations of various gases to be measured are obtained based on the analysis results.

[0102] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0103] According to the analysis result, the position of the central wavelength of the broad spectrum light is obtained;

[0104] According to the position of the central wavelength, the drift of the central wavelength is calculated;

[0105] The concentration of the gas to be measured is calculated based on the drift of the central wavelength.

[0106] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0107] A side-polished FBG is obtained by polishing the side of a single-mode FBG using a polishing device, and a single-layer graphene is attached to the side region of the side-polished FBG to obtain a graphene side-polished FBG, so that the single-layer graphene tunes the central wavelength of the side-polished FBG;

[0108] The broad spectrum light generated by the amplified spontaneous emission light source is sequentially passed into the polarization controller, the optical fiber coupler and at least one graphene side-polished FBG;

[0109] Tuning the polarization state of broadband light to tune the loss of graphene side-polished FBG;

[0110] Receive and analyze the broad spectrum light transmitted by the graphene side-polished FBG to obtain analysis results;

[0111] The concentrations of various gases to be measured are obtained based on the analysis results.

[0112] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0113] According to the analysis result, the position of the central wavelength of the broad spectrum light is obtained;

[0114] According to the position of the central wavelength, the drift of the central wavelength is calculated;

[0115] The concentration of the gas to be measured is calculated based on the drift of the central wavelength.

[0116] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0117] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0118] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0119] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A gas sensing system based on graphene side-polished FBG, characterized in that: The system includes an amplified spontaneous emission light source, a polarization controller, a fiber coupler, a spectrum analyzer, a real-time demodulation system and at least one graphene side-polished FBG; The graphene side-polished FBG comprises a single-layer graphene and a side-polished FBG polished by a polishing device, wherein the single-layer graphene is used to tune the central wavelength of the side-polished FBG; The amplified spontaneous emission light source is used to generate multi-path broadband light which is sequentially passed into the polarization controller, the optical fiber coupler and at least one of the graphene side-polished FBGs; The polarization controller is used to tune the polarization state of the broadband light to tune the loss of the graphene side-polished FBG; The spectrum analyzer is used to receive the broad spectrum light transmitted by the graphene side edge polishing FBG and analyze it to obtain the analysis result; The real-time demodulation system is used to obtain the concentrations of multiple gases to be measured based on the analysis results.

2. The system according to claim 1, characterized in that The laser effective area of ​​the side-polished FBG and the single-layer graphene is 2×10 -8 m 2 -8×10 -8 m 2 within the range.

3. The system according to claim 1, characterized in that The real-time demodulation system is specifically used for: According to the analysis result, the position of the central wavelength of the broad-spectrum light is obtained; according to the position of the central wavelength, the drift of the central wavelength is calculated; according to the drift of the central wavelength, the concentration of the gas to be measured is calculated.

4. The system according to claim 1, characterized in that The central wavelength of the side-polished FBG is in the range of 550nm-1570nm, and the transmission bandwidth of the side-polished FBG is 1nm.

5. The system according to claim 1, characterized in that The polishing area depth of the side-polished FBG is in the range of 50 μm-60 μm.

6. The system according to claim 1, characterized in that The wavelength of the broad-spectrum light generated by the amplified spontaneous emission light source is within the range of 1525nm-1575nm.

7. The system according to claim 1, characterized in that The polishing device comprises an optical fiber fixing device, a polishing grinding wheel, a grinding wheel driving motor and a three-dimensional diameter measuring platform.

8. The system according to claim 1, characterized in that The polishing area length of the side polishing FBG is 2 cm.

9. A gas sensing method based on graphene side-polished FBG, characterized in that: The method comprises: Polishing the side of a single-mode FBG using a polishing device to obtain a side-polished FBG, attaching a single-layer graphene to the side region of the side-polished FBG to obtain a graphene side-polished FBG, so that the single-layer graphene tunes the central wavelength of the side-polished FBG; Passing the broad-spectrum light generated by the amplified spontaneous emission light source into the polarization controller, the optical fiber coupler and at least one of the graphene side-polished FBGs in sequence; Tuning the polarization state of the broadband light to tune the loss of the graphene side-polished FBG; receiving and analyzing the broad-spectrum light transmitted by the graphene side-edge polished FBG to obtain an analysis result; The concentrations of multiple gases to be measured are obtained based on the analysis results.

10. The method according to claim 9, characterized in that The obtaining of multiple concentrations of gases to be measured based on the analysis results includes: According to the analysis result, obtaining the position of the central wavelength of the broadband light; According to the position of the central wavelength, the drift amount of the central wavelength is calculated; The concentration of the gas to be measured is calculated according to the drift of the central wavelength.

Images