Gas concentration detection system and method, electronic equipment and storage medium

Abstract

The invention provides a gas concentration detection system and method, electronic equipment and a storage medium, relates to the technical field of communication, and is used for improving the efficiency and resolution of gas concentration detection so as to improve the efficiency and accuracy of gas detection alarm. The system comprises an electro-optical modulation unit used for modulating an initial optical signal emitted by a light source radiation unit according to an initial microwave signal to obtain a modulated optical signal; the optical fiber gas detection unit is used for reflecting the modulated light signal to obtain a target reflected light signal and sending the target reflected light signal to the photoelectric conversion unit; the photoelectric conversion unit is used for converting the target reflection light signal into a target reflection microwave signal and sending the target reflection microwave signal to the digital signal processing unit; and the digital signal processing unit is used for obtaining the target gas change concentration according to the initial microwave signal and the target reflection microwave signal sent by the electro-optical modulation unit.

Description

Technical Field

[0001] This application relates to the field of communication systems, and more particularly to a gas concentration detection system, method, electronic device, and storage medium. Background Technology

[0002] Leaks of flammable, explosive, toxic, and harmful gases can lead to serious accidents, making distributed, multi-point real-time monitoring and emergency alarm systems crucial for ensuring safety. Traditional gas detectors detect gas concentration by sensing changes in the wavelength of light signals caused by gas variations. When gas concentrations are abnormal, they primarily use a local alarm, but this may not be sufficient to contact emergency services if personnel are unconscious. This is particularly critical in industrial settings with high production risks and high detection accuracy requirements, as such leaks can lead to severe accident consequences. Summary of the Invention

[0003] This application provides a gas concentration detection system, method, electronic device, and storage medium to improve the efficiency and resolution of gas concentration detection, thereby improving the efficiency and accuracy of gas detection alarms.

[0004] In a first aspect, this application provides a gas concentration detection system, comprising: a light source radiation unit, an electro-optic modulation unit, an optical fiber gas detection unit, a photoelectric conversion unit, and a digital signal processing unit; the electro-optic modulation unit is connected to the light source radiation unit, the optical fiber gas detection unit, and the digital signal processing unit respectively, and the photoelectric conversion unit is connected to the optical fiber gas detection unit and the digital signal processing unit respectively; the electro-optic modulation unit is used to modulate an initial optical signal emitted by the light source radiation unit according to an initial microwave signal to obtain a modulated optical signal; wherein, the modulated optical signal exhibits a linear frequency sweep change; the optical fiber gas detection unit is used to reflect the modulated optical signal to obtain a target reflected optical signal, and send the target reflected optical signal to the photoelectric conversion unit; the photoelectric conversion unit is used to convert the target reflected optical signal into a target reflected microwave signal, and send the target reflected microwave signal to the digital signal processing unit; the digital signal processing unit is used to obtain the target gas change concentration according to the initial microwave signal emitted by the electro-optic modulation unit and the target reflected microwave signal; wherein, the target gas is the gas detected by the optical fiber gas detection unit.

[0005] The technical solution provided in this application offers at least the following advantages: Compared to related technologies that directly detect gas concentration using fiber optic gas sensors, this application uses a photoelectric conversion unit to convert the target reflected light signal from the target gas detection unit into a target reflected microwave signal. The digital signal processing unit then determines the change in target gas concentration based on the initial microwave signal and the target reflected microwave signal, enabling high-speed and high-resolution gas detection and improving the accuracy of determining target gas concentration changes. Simultaneously, the digital signal processing unit can determine whether an anomaly is present based on the target gas concentration change and, in the event of an anomaly, send an alarm signal to the rescue center via the operator's network, improving the efficiency and accuracy of gas detection alarms and providing higher security.

[0006] One possible implementation is that the fiber optic gas detection unit includes: a beam splitting unit and multiple fiber optic gas sensors; the beam splitting unit is connected to an electro-optic modulation unit, a photoelectric conversion unit, and multiple fiber optic gas sensors respectively; the beam splitting unit is used to split the modulated optical signal into multiple target emitted optical signals and send the multiple target emitted optical signals to their respective fiber optic gas sensors; it is also used to receive multiple target reflected optical signals reflected by the multiple target emitted optical signals through their respective corresponding fiber optic gas sensors.

[0007] Another possible implementation includes the following: the fiber optic gas detection unit further includes: multiple time-delayed optical fibers, which are respectively connected to the beam splitting unit and multiple fiber optic gas sensors; multiple target emitted light signals are respectively sent to the corresponding fiber optic gas sensors via the multiple time-delayed optical fibers; multiple target reflected light signals are respectively sent to the beam splitting unit via the multiple time-delayed optical fibers; and the multiple time-delayed optical fibers have different lengths.

[0008] Another possible implementation includes a beam splitting unit comprising a circulator and a beam splitter; the circulator is connected to the electro-optic modulation unit, the beam splitter, and the photoelectric conversion unit, respectively, and the beam splitter is also connected to multiple delay fibers; the circulator is used to send the modulated optical signal to the beam splitter; the beam splitter is used to split the modulated optical signal into multiple target transmission signals and send the multiple target transmission signals to the corresponding delay fibers; it is also used to receive multiple target reflected optical signals emitted by the multiple delay fibers; the circulator is also used to send the multiple target reflected optical signals emitted by the beam splitter to the photoelectric conversion unit.

[0009] Another possible implementation is that the photoelectric conversion unit includes: a dispersion unit and a photodetector; the dispersion unit is connected to both the fiber optic gas detection unit and the photodetector, and the photodetector is also connected to the digital signal processing unit; the dispersion unit is used to compensate for the dispersion of the target reflected light signal emitted by the fiber optic gas detection unit to obtain the target reflection time delay signal, and sends the target reflection time delay signal to the photodetector; the photodetector is used to perform photoelectric conversion on the target reflection time delay signal to obtain the target microwave signal, and sends the target reflected microwave signal to the digital signal processing unit.

[0010] Another possible implementation involves a digital signal processing unit comprising: a signal processor, a data acquisition card, and a mixer; the mixer is connected to the fiber optic gas detection unit, the electro-optic modulation unit, and the data acquisition card; the signal processor is connected to the data acquisition card; the mixer is used to mix the initial microwave signal sent by the photoelectric modulation unit with the target reflected microwave signal to obtain a difference frequency signal; the data acquisition card is used to acquire the difference frequency signal emitted by the mixer and send the difference frequency signal to the signal processor; the signal processor is used to obtain the target gas concentration change based on the difference frequency signal.

[0011] Another possible implementation is that the electro-optic modulation unit includes: a microwave signal generator and an electro-optic modulator; the electro-optic modulator is connected to the light source radiation unit, the microwave signal generator and the fiber optic gas detection unit respectively; the microwave signal generator is used to generate an initial microwave signal and send the microwave signal to the electro-optic modulator; the electro-optic modulator is used to modulate the initial optical signal emitted by the light source radiation unit according to the initial microwave signal to obtain a modulated optical signal.

[0012] In another possible implementation, the microwave signal generator is also connected to a digital signal processing unit; the digital signal processing unit is used to receive the initial microwave signal sent by the microwave signal generator.

[0013] In another possible implementation, the digital signal processing unit also connects to an external rescue center via an operator's network to send an alarm signal to the external rescue center when the concentration of the target gas exceeds a preset concentration threshold.

[0014] Another possible implementation is to embed the gas concentration detection system into a whole-house fiber optic network system; the whole-house fiber optic network system is connected to the operator's network.

[0015] Secondly, this application provides a method for detecting gas concentration, applied to a digital signal processing unit in the aforementioned gas concentration detection system. The method includes: obtaining the target gas change concentration based on an initial microwave signal and a target reflected microwave signal; wherein the initial microwave signal is emitted by an electro-optic modulation unit; the target reflected microwave signal is obtained by a photoelectric conversion unit based on a target reflected light signal emitted by an optical fiber gas detection unit; the target reflected light signal is obtained by reflecting a modulated light signal through the optical fiber gas detection unit; the modulated light signal is obtained by the electro-optic modulation unit modulating the initial light signal emitted by the light source radiation unit based on the initial microwave signal, and the modulated light signal exhibits a frequency sweep linear change; the target gas is the gas detected by the optical fiber gas detection unit.

[0016] The technical solution provided in this application offers at least the following advantages: Compared to related technologies that directly detect gas concentration using fiber optic gas sensors, this application uses a photoelectric conversion unit to convert the target reflected light signal from the target gas detection unit into a target reflected microwave signal. The digital signal processing unit then determines the change in target gas concentration based on the initial microwave signal and the target reflected microwave signal, enabling high-speed and high-resolution gas detection and improving the accuracy of determining target gas concentration changes. Simultaneously, the digital signal processing unit can determine whether an anomaly is present based on the target gas concentration change and, in the event of an anomaly, send an alarm signal to the rescue center via the operator's network, improving the efficiency and accuracy of gas detection alarms and providing enhanced security.

[0017] Another possible implementation involves obtaining the target gas concentration change based on the initial microwave signal and the target reflected microwave signal, including: obtaining a difference frequency signal based on the initial microwave signal and the target reflected microwave signal; determining the target gas concentration change based on the difference frequency signal when the target gas concentration changes; the target gas is a gas that can be detected by the target fiber optic gas sensor, and the target fiber optic gas sensor is any one of multiple fiber optic gas sensors.

[0018] Another possible implementation method includes determining the position of the target gas sensor based on the difference frequency signal when the concentration of the target gas remains unchanged.

[0019] Thirdly, this application provides an electronic device comprising: a processor and a memory; the memory storing processor-executable instructions; when the processor is configured to execute the instructions, causing the electronic device to implement the method of the second aspect described above.

[0020] Fourthly, this application provides a computer-readable storage medium comprising: computer software instructions; when the computer software instructions are executed in an electronic device, they cause the electronic device to implement the method described in the second aspect.

[0021] Fifthly, this application provides a computer program product comprising a computer program; when the computer program is run in an electronic device, it causes the electronic device to implement the method described in the second aspect above.

[0022] The beneficial effects of the third to fifth aspects mentioned above are described in the corresponding descriptions of the first or second aspects, and will not be repeated here. Attached Figure Description

[0023] Figure 1 A schematic diagram of a gas concentration detection system provided in an embodiment of this application is shown; Figure 2 A schematic diagram of another gas concentration detection system provided in an embodiment of this application is shown; Figure 3 This application provides a feature map of a microwave signal according to an embodiment. Figure 4 A schematic diagram of another gas concentration detection system provided in an embodiment of this application is shown; Figure 5 This illustration shows a structural schematic diagram of a whole-house fiber optic networking system provided in an embodiment of this application; Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown. Detailed Implementation

[0024] The following is a detailed description, with reference to the accompanying drawings, of a gas concentration detection system, method, electronic device, and storage medium provided in this application.

[0025] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0026] The terms "first" and "second," etc., used in the specification and drawings of this application are used to distinguish different objects or to distinguish different treatments of the same object, rather than to describe a specific order of objects.

[0027] Furthermore, the terms "comprising" and "having," and any variations thereof, used in the description of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0028] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] To facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish the same or similar items with essentially the same function and effect. Those skilled in the art can understand that the terms "first" and "second" are not intended to limit the quantity or execution order.

[0030] In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0031] Leaks of flammable, explosive, toxic, and harmful gases can lead to serious accidents, making distributed, multi-point real-time monitoring and emergency alarm systems crucial for ensuring safety. Traditional gas detectors detect gas concentration by sensing changes in the wavelength of light signals caused by gas variations. When gas concentrations are abnormal, they primarily use a local alarm, but this may not be sufficient to contact emergency services if personnel are unconscious. This is particularly critical in industrial settings with high production risks and high detection accuracy requirements, as such leaks can lead to severe accident consequences.

[0032] To address the aforementioned technical challenges, this application employs an integrated optical network sensing technology to combine environmental perception and high-speed communication. Fiber optic sensors, with their advantages of small size, high temperature resistance, corrosion resistance, and interference resistance, are suitable for extreme environments. Microwave photonics technology, by converting the optical signal changes caused by the measurement into the microwave domain, further enhances demodulation speed and resolution through mature and high-precision microwave domain detection equipment. Fiber to the Home (FTTR) whole-house fiber optic networking systems, through whole-house fiber optic deployment, can achieve room-level coverage, providing distributed multi-point monitoring conditions for indoor hazardous gas detection. Therefore, integrating fiber optic gas sensors into FTTR enables integrated optical network sensing. Hazardous gas detection equipment can be installed simultaneously with the operator's fiber optic deployment, allowing for rapid and direct notification of emergencies to rescue departments via the operator's network, thereby achieving efficient safety monitoring and alarm systems.

[0033] For example, this application provides a gas concentration detection system in the following way: an electro-optic modulation unit modulates an initial light signal emitted by a light source radiation unit based on an initial microwave signal to obtain a modulated light signal, which is then transmitted to an optical fiber gas detection unit. The optical fiber gas detection unit reflects the modulated light signal to obtain a target reflected light signal, and sends the target reflected light signal to a photoelectric conversion unit. The photoelectric conversion unit converts the target reflected light signal into a target reflected microwave signal. A digital signal processing unit then determines the target gas concentration change based on the initial microwave signal and the target reflected microwave signal. It is understood that, compared to related technologies that directly detect gas concentration using an optical fiber gas sensor, this application uses a photoelectric conversion unit to convert the target reflected light signal from the target gas detection unit into a target reflected microwave signal. The digital signal processing unit then determines the target gas concentration change based on the initial microwave signal and the target reflected microwave signal, enabling high-speed and high-resolution gas detection and improving the accuracy of determining the target gas concentration change. Simultaneously, the digital signal processing unit can determine whether there is an anomaly based on the target gas concentration change and, in the event of an anomaly, send an alarm signal to a rescue center via the operator network, improving the efficiency and accuracy of gas detection alarms and providing higher security.

[0034] The gas concentration monitoring system provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0035] It should be noted that the system architecture described in the embodiments of this application is for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and does not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of system architecture, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0036] Figure 1 A schematic diagram of a gas concentration detection system provided in an embodiment of this application is shown. Please refer to [link / reference]. Figure 1 As shown, the detection system includes: a light source radiation unit 100, an electro-optic modulation unit 200, an optical fiber gas detection unit 300, a photoelectric conversion unit 400, and a digital signal processing unit 500; the electro-optic modulation unit 200 is connected to the light source radiation unit 100, the optical fiber gas detection unit 300, and the digital signal processing unit 500, respectively, and the photoelectric conversion unit 400 is connected to the optical fiber gas detection unit 300 and the digital signal processing unit 500, respectively.

[0037] For example, the light source radiation unit 100 can be a broadband amplified spontaneous emission (ASE) light source, which is a high-performance broadband light source based on doped fiber and pump laser technology, which generates a broadband output by amplifying spontaneous emission.

[0038] In some embodiments, the electro-optic modulation unit 200 is used to modulate the initial optical signal emitted by the light source radiation unit 100 according to the initial microwave signal to obtain a modulated optical signal; wherein the modulated optical signal exhibits a linear frequency sweep change.

[0039] For example, the electro-optic modulation unit 200 can generate an initial microwave signal and modulate the initial optical signal according to the initial microwave signal to obtain a modulated optical signal. The initial microwave signal is a linearly swept microwave signal, so the modulated optical signal obtained also exhibits a swept-frequency linear change.

[0040] In some embodiments, the fiber optic gas detection unit 300 is used to reflect and modulate an optical signal to obtain a target reflected optical signal, and then send the target reflected optical signal to the photoelectric conversion unit 400.

[0041] For example, the fiber optic gas detection unit 300 can detect the concentration of fiber optic gas. When the modulated light signal is irradiated by the fiber optic gas detection unit 300, the modulated light signal can be reflected back to obtain the target reflected light signal. When the concentration of fiber optic gas changes, it will affect the reflection of the modulated light signal. The reflected target reflected light signal will generate a frequency difference with the modulated light signal.

[0042] In some embodiments, the photoelectric conversion unit 400 is used to convert the target reflected light signal into a target reflected microwave signal and send the target reflected microwave signal to the digital signal processing unit 500.

[0043] For example, the target reflected light signal is an optical domain signal, and the target reflected microwave signal is an electrical domain signal. By converting the target reflected light signal into an electrical domain target reflected microwave signal, the target reflected microwave signal can be mixed with the initial microwave signal in the electrical domain.

[0044] In some embodiments, the digital signal processing unit 500 is used to obtain the target gas change concentration based on the initial microwave signal emitted by the electro-optic modulation unit 200 and the target reflected microwave signal; wherein the target gas is the gas detected by the fiber optic gas detection unit 300.

[0045] For example, the digital signal processing unit 500 processes the initial microwave signal and the target reflected microwave signal to obtain the change in the light signal. This change in the light signal is due to the change in gas concentration, and the target gas concentration can be determined based on the change in the light signal.

[0046] Figure 2 A schematic diagram of another gas concentration detection system provided in this application embodiment is shown. Please refer to [link / reference]. Figure 2As shown, the fiber optic gas detection unit 300 includes: a beam splitting unit 310 and multiple fiber optic gas sensors 330; the beam splitting unit 310 is connected to the electro-optic modulation unit 200, the photoelectric conversion unit 400, and the multiple fiber optic gas sensors 330 respectively; the beam splitting unit 310 is used to split the modulated optical signal into multiple target emitted optical signals and send the multiple target emitted optical signals to the corresponding fiber optic gas sensors 330 respectively; it is also used to receive multiple target reflected optical signals reflected by the multiple target emitted optical signals through their respective corresponding fiber optic gas sensors 330.

[0047] In some embodiments, the fiber optic gas detection unit 300 further includes: a plurality of time-delayed optical fibers 320, which are respectively connected to the beam splitting unit 310 and a plurality of fiber optic gas sensors 330; a plurality of target emitted light signals are respectively sent to the corresponding fiber optic gas sensors 330 via the plurality of time-delayed optical fibers 320; a plurality of target reflected light signals are respectively sent to the beam splitting unit 310 via the plurality of time-delayed optical fibers 320; and the plurality of time-delayed optical fibers 320 have different lengths.

[0048] For example, the modulated optical signal is divided into multiple target emission optical signals by the beam splitting unit 310, and the multiple target emission optical signals are sent to the corresponding fiber optic gas sensors 330 through multiple delay optical fibers 320 to detect the target gas concentration.

[0049] For example, by distributing multiple wavelength fiber optic gas sensors (WFBG) 330 throughout the room, and each WFBG 330 detecting a different type of gas, multiple gases can be detected in various locations within the room. The WFBG 330 can detect gases such as methane and carbon monoxide.

[0050] For example, by setting multiple delay optical fibers 320 to different lengths, the time interval of the target reflected light signal reflected back by each optical fiber gas sensor 330 is different, and the corresponding difference frequency signal is also different, thereby determining the position of each optical fiber gas sensor 330.

[0051] Figure 3 A feature map of a microwave signal provided in an embodiment of this application is shown. Please refer to [link / reference]. Figure 3 As shown, f Indicates the microwave frequency of the sweep signal. t Indicates time; Δf The microwave frequency representing the difference frequency signal. I This indicates the amplitude of the difference frequency signal; WFBG represents the fiber optic gas sensor 330. At the microwave frequency of the sweep frequency signal... f With time tIn the waveform diagram, the solid line represents the initial microwave signal as the swept frequency microwave signal, and the dashed line represents the target reflected microwave signal as the swept frequency microwave signal. The waveform changes of the modulated optical signal and the initial microwave signal have the same trend. However, when the modulated optical signal is sent to the fiber optic gas detection unit 300, the reflected target microwave signal will have a certain delay. It can be seen that the dashed line lags behind the solid line by a certain time, thus generating a difference frequency signal. Since the length of each delay fiber 320 is different, the corresponding difference frequency signal will also be different, thereby determining the position of each fiber optic gas sensor 330. For example, from... Figure 3 It can be seen that the amplitudes of the difference frequency signals of WFBG1, WFBG2, WFBG3, and WFBG4 are the same, but the frequencies of the difference frequency signals are different. Δf The different sizes allow us to determine the positions of WFBG1, WFBG2, WFBG3, and WFBG4.

[0052] In some embodiments, please refer to Figure 2 As shown, the beam splitting unit 310 includes a circulator 311 and a beam splitter 312. The circulator 311 is connected to the electro-optic modulation unit 200, the beam splitter 312, and the photoelectric conversion unit 400, respectively. The beam splitter 312 is also connected to multiple delay optical fibers 320. The circulator 311 is used to send the modulated optical signal to the beam splitter 312. The beam splitter 312 is used to split the modulated optical signal into multiple target transmission signals and send the multiple target transmission signals to the corresponding delay optical fibers 320. It is also used to receive multiple target reflected optical signals emitted by the multiple delay optical fibers 320. The circulator 311 is also used to send the multiple target reflected optical signals emitted by the beam splitter 312 to the photoelectric conversion unit 400.

[0053] For example, the circulator 311 (Optical Circulator, OCir) can input a signal from one port and force it to output sequentially from the next port, thus changing the transmission loop of the optical signal. The optical splitter 312 (Optical Splitter, OS) can distribute the optical signal in one optical fiber to multiple optical fibers in a certain proportion, or combine multiple optical signals into one. After the optical fiber gas sensor 330 reflects the target reflected light signal back, it returns to the circulator 311 through the delay fiber 320 and the splitter 312. The circulator 311 transmits the received multiple target reflected light signals to the photoelectric conversion unit 400 to convert the multiple target reflected light signals into electrical signals.

[0054] In some embodiments, please refer to Figure 2As shown, the photoelectric conversion unit 400 includes: a dispersion unit 410 and a photodetector 420; the dispersion unit 410 is connected to the fiber optic gas detection unit 300 and the photodetector 420 respectively, and the photodetector 420 is also connected to the digital signal processing unit 500; the dispersion unit 410 is used to compensate for the dispersion of the target reflected light signal emitted by the fiber optic gas detection unit 300 to obtain the target reflection time delay signal, and send the target reflection time delay signal to the photodetector 420; the photodetector 420 is used to convert the target reflection time delay signal to obtain the target reflected microwave signal, and send the target reflected microwave signal to the digital signal processing unit 500.

[0055] For example, the dispersion unit 410 can be a dispersion-compensating fiber (DCF) used to achieve wavelength-to-time-delay conversion.

[0056] For example, this application uses a dispersion unit 410 to perform dispersion compensation on the target reflected light signal, converting the wavelength change of the target reflected light signal into a time delay change of the target reflected light signal, and then uses a photodiode (PD) 420 to convert the time delay signal of the target reflected light signal after time delay adjustment into a target reflected microwave signal, so as to mix the target reflected microwave signal with the initial microwave signal.

[0057] In some embodiments, please refer to Figure 2 As shown, the digital signal processing unit 500 includes: a signal processor 510, a data acquisition card 520, and a mixer 530; the mixer 530 is connected to the fiber optic gas detection unit 300, the electro-optic modulation unit 200, and the data acquisition card 520, respectively; the signal processor 510 is connected to the data acquisition card 520; the mixer 530 is used to mix the initial microwave signal sent by the photoelectric modulation unit with the target reflected microwave signal to obtain a difference frequency signal; the data acquisition card 520 is used to acquire the difference frequency signal sent by the mixer 530 and send the difference frequency signal to the signal processor 510; the signal processor 510 is used to obtain the target gas change concentration based on the difference frequency signal.

[0058] For example, mixer 530 can obtain a difference frequency signal from the initial microwave signal and the target reflected microwave signal; data acquisition (DAQ) card 520 can acquire the difference frequency signal output by mixer 530 and send the difference frequency signal to signal processor 510. Signal processor (DSP) 510 can convert the difference frequency signal to obtain the target gas concentration change; when the target gas concentration does not change, the difference frequency signal is the initial microwave signal. Since the lengths of multiple delay fibers 320 are different, the received target reflected microwave signals are different, thereby determining the position of each fiber gas sensor 330. When the target gas concentration changes, the difference frequency signal is the target difference frequency signal, which reflects the amount of change in target gas concentration. The target gas concentration change can be determined based on the target difference frequency signal.

[0059] It is understandable that when the gas concentration changes, the time delay of the microwave signal reflected by the target will change, and the time delay difference between the initial microwave signal and the microwave signal reflected by the target will change. Therefore, the frequency of the difference frequency signal will change.

[0060] In some embodiments, please refer to Figure 2 As shown, the electro-optic modulation unit 200 includes a microwave signal generator 220 and an electro-optic modulator 210; the electro-optic modulator 210 is connected to the light source radiation unit 100, the microwave signal generator 220 and the fiber optic gas detection unit 300 respectively; the microwave signal generator 220 is used to generate an initial microwave signal and send the microwave signal to the electro-optic modulator 210; the electro-optic modulator 210 is used to modulate the initial optical signal emitted by the light source radiation unit 100 according to the initial microwave signal to obtain a modulated optical signal.

[0061] For example, microwave signal generator 220 is used to generate an initial microwave signal, which is a linearly swept microwave signal, so that electro-optic modulator 210 (EOM) modulates the initial optical signal according to the initial microwave signal to obtain a modulated optical signal, so that the modulated optical signal also exhibits a linearly swept frequency change.

[0062] In some embodiments, the microwave signal generator 220 is also connected to the digital signal processing unit 500; the digital signal processing unit 500 is used to receive the initial microwave signal sent by the microwave signal generator 220.

[0063] For example, the digital signal processing unit 500 receives an initial microwave signal to obtain a difference frequency signal based on the initial microwave signal and the target reflected microwave signal, thereby determining the target gas change concentration and the position of the fiber optic gas sensor 330 based on the difference frequency signal.

[0064] In some embodiments, the digital signal processing unit 500 is also connected to an external rescue center via an operator network to send an alarm signal to the external rescue center when the concentration of the target gas exceeds a preset concentration threshold.

[0065] For example, the digital signal processing unit 500 connects to an external rescue center via the operator's network. When the concentration of the target gas exceeds a preset concentration threshold, it can directly send an alarm signal to the external rescue center. Compared to related technologies where the fiber optic gas sensor 330 detects a change in the concentration of the target gas and sends an alarm signal directly, requiring the user to receive the alarm signal before calling the rescue center, which may result in the user becoming unconscious and unable to make a call or escape, this solution offers higher security.

[0066] In some embodiments of this application, a method for detecting gas concentration is provided, applied to a digital signal processing unit in a gas concentration detection system. The method includes: obtaining the change concentration of a target gas based on an initial microwave signal and a target reflected microwave signal; wherein the initial microwave signal is emitted by an electro-optic modulation unit; the target reflected microwave signal is obtained by a photoelectric conversion unit based on a target reflected light signal emitted by an optical fiber gas detection unit; the target reflected light signal is obtained by reflecting a modulated light signal through the optical fiber gas detection unit; the modulated light signal is obtained by the electro-optic modulation unit modulating an initial light signal emitted by a light source radiation unit based on the initial microwave signal, and the modulated light signal exhibits a frequency sweep linear change; the target gas is the gas detected by the optical fiber gas detection unit.

[0067] For example, the digital signal processing unit determines the target gas concentration change based on the initial microwave signal and the target reflected microwave signal. Compared to related technologies where a change in gas concentration is directly detected by a fiber optic gas sensor and an alarm signal is issued directly through the sensor, this application determines the target gas concentration change through the digital signal processing unit. This digital signal processing unit can then send an alarm signal to the rescue center via the operator's network, offering higher security. Furthermore, the photoelectric conversion unit converts the target reflected light signal into a target reflected microwave signal, achieving the conversion of light signal into electrical signal. The signal processor then determines the target gas concentration change based on the initial microwave signal and the target reflected microwave signal in the electrical domain, improving the determination rate and accuracy of the target gas concentration change.

[0068] In some embodiments, obtaining the target gas change concentration based on the initial microwave signal and the target reflected microwave signal includes: obtaining a difference frequency signal based on the initial microwave signal and the target reflected microwave signal; determining the target gas change concentration based on the difference frequency signal when the target gas concentration changes; the target gas is a gas that can be detected by a target fiber optic gas sensor, and the target fiber optic gas sensor is any one of a plurality of fiber optic gas sensors.

[0069] For example, when the concentration of the target gas changes, the difference frequency signal is the target difference frequency signal. The frequency of the target difference frequency signal is related to the change in the concentration of the target gas. The following calculation formula can be used to express this:

[0070] in, This represents the wavelength of the microwave signal reflected by the target of the i-th fiber optic gas sensor. B This represents the sweep bandwidth of the initial microwave signal. T This indicates the sweep period of the initial microwave signal. This indicates the dispersion of the dispersion compensation unit.

[0071] wavelength of microwave signal reflected by the target Specifically, the following calculation formula can be used:

[0072] in, Indicates the wavelength of the modulated optical signal. This represents the coefficient of thermal expansion of the gas-sensitive thin film. This indicates the change in the concentration of the target gas.

[0073] Therefore, it can be seen that the initial microwave signal sweep bandwidth B The sweep period of the initial microwave signal T Fiber effective refractive index n Dispersion of the dispersion compensation unit and the coefficient of thermal expansion of gas-sensitive films Given the information, determine the frequency of the target difference frequency signal. Then, the change in the concentration of the target gas can be calculated. .

[0074] For example, when the target gas concentration changes to the concentration of CO gas, the wavelength of the microwave signal reflected by the target is... Specifically, the following calculation formula can be used:

[0075] in, Indicates the wavelength of the modulated optical signal. This represents the coefficient of thermal expansion of the CO gas-sensitive thin film. This indicates the change in CO gas concentration.

[0076] For example, when the target gas concentration changes to the same level as the methane gas concentration, the wavelength of the microwave signal reflected by the target is... Specifically, the following calculation formula can be used:

[0077] in, Indicates the wavelength of the modulated optical signal. Indicates the coefficient of thermal expansion of the methane gas-sensitive thin film. This indicates the change in the concentration of methane gas.

[0078] In some embodiments, the gas concentration detection method further includes: determining the position of the target gas sensor based on the difference frequency signal when the concentration of the target gas has not changed.

[0079] For example, when the concentration of the target gas remains unchanged, the frequency of the difference frequency signal is the same as the frequency of the initial difference frequency signal. The following calculation formula can be used to express this:

[0080] in, B This represents the sweep bandwidth of the initial microwave signal. T This indicates the sweep period of the initial microwave signal. n Indicates the effective refractive index of the optical fiber. l This indicates the distance between the fiber optic gas sensor and the photodetector.

[0081] Therefore, it can be seen that because each fiber optic gas sensor corresponds to a different delay fiber, the distance from the fiber optic gas sensor to the photoelectric detection is affected. l Different. In the initial microwave signal sweep bandwidth... B The sweep period of the initial microwave signal T and the effective refractive index of optical fibers n Given the frequency of the initial difference frequency signal, the distance between the fiber optic gas sensor and the photodetector can be calculated. l This allows us to determine the location of the fiber optic gas sensor corresponding to the delayed fiber.

[0082] As can be seen, the above mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, the embodiments of this application provide corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, in conjunction with the modules and algorithm steps of the various examples described in the embodiments disclosed herein, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed by hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.

[0083] Figure 4 A schematic diagram of another gas concentration detection system provided in this application embodiment is shown. Please refer to [link / reference]. Figure 4 As shown, the ASE emits an initial optical signal to the EOM. The EOM modulates the initial optical signal according to the microwave signal (equivalent to the initial microwave signal) to obtain a modulated optical signal. The microwave signal is a linearly swept frequency signal. The modulated optical signal is transmitted to the OS via the OCir. The OS divides the modulated optical signal into multiple target emitted optical signals, which are then transmitted to the corresponding WFBGs through multiple delay fibers. The WFBGs can be methane sensors or CO sensors. The WFBGs reflect the target emitted optical signals to obtain the target reflected optical signals, which are then returned to the beam splitter via delay fibers. The beam splitter transmits the received target reflected optical signals to the OCir. The OCir transmits the target reflected optical signals to the DCF. The DCF performs dispersion compensation on the target reflected optical signals to obtain the target reflection time delay signal. The PD converts the target reflection time delay signal to obtain the target reflected microwave signal. The mixer mixes the target reflected microwave signal and the microwave signal (equivalent to the initial microwave signal) emitted by the PD to obtain a difference frequency signal. The DAQ acquires the difference frequency signal output by the mixer and transmits it to the signal processor. The signal processor obtains the target gas concentration change based on the difference frequency signal.

[0084] In some embodiments, the gas concentration detection system provided in this application is embedded in a whole-house fiber optic network system; the whole-house fiber optic network system is connected to the operator's network. Thus, when the gas concentration detection system determines that the concentration of a target gas exceeds a preset concentration threshold, it can send an alarm signal to the fire and rescue center via the operator's network, providing higher security.

[0085] Figure 5 This paper presents a schematic diagram of a whole-house fiber optic networking system according to an embodiment of this application. Please refer to [link / reference]. Figure 5As shown, the whole-house fiber optic network system includes: a signal processor (DSP), an optical line terminal (OLT), an optical splitter (OS), a methane sensor, a CO sensor, an optical network terminal (ONT), and a microwave power supply (MWP) system. The MWP system includes: a light source radiation unit, an electro-optic modulator, a microwave signal generator, a circulator, a dispersion unit, a photodetector, a mixer, and a data acquisition card. The DSP connects to the OS via the OLT. The OS splits the modulated optical signal output from the electro-optic modulator in the MWP system into multiple target emission optical signals, which are then sent to the corresponding methane and CO sensors. Both the methane and CO sensors are located in the ONT. The DSP obtains the difference frequency signal from the data acquisition card in the MWP system and determines the target gas concentration change and the location of the corresponding fiber optic gas sensor based on the difference frequency signal. If the target gas concentration change exceeds a preset concentration threshold, an alarm signal is sent to the fire and rescue center via the operator's network.

[0086] Integrating a fiber optic gas sensing system into an FTTR enables unified sensing across the optical network. Hazardous gas detection equipment can be installed simultaneously with the operator's fiber optic deployment, allowing for rapid and direct notification of emergencies to rescue departments via the operator's network, achieving efficient safety monitoring and alarm functions. Combining this with microwave photonics demodulation enables high-speed, high-resolution gas monitoring. This solution primarily addresses typical industrial and residential scenarios, connecting several fiber optic gas sensors in parallel via an OS and placing them before the optical network terminal (ONT). The microwave photonics demodulation system is placed alongside the optical line terminal (OLT). The demodulated sensor signal is processed and identified by a digital signal processing (DSP) unit, and then the hazard information is reported to the fire and rescue center via the operator's network.

[0087] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of this application is shown below. Please refer to [link / reference]. Figure 6 As shown, the electronic device 900 includes: a processor 902, a communication interface 903, and a bus 904. Optionally, the electronic device 900 may also include a memory 901.

[0088] Processor 902 may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 902 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 902 may also be a combination that implements computing functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0089] The communication interface 903 is used to connect to other devices via a communication network. This communication network can be Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0090] The memory 901 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0091] In one possible implementation, the memory 901 can exist independently of the processor 902. The memory 901 can be connected to the processor 902 via a bus 904 and is used to store instructions or program code. When the processor 902 calls and executes the instructions or program code stored in the memory 901, it can implement the gas concentration detection method provided in this embodiment of the invention.

[0092] In another possible implementation, the memory 901 can also be integrated with the processor 902.

[0093] The 904 bus can be an extended industry standard architecture (EISA) bus, etc. The 904 bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0094] Through the above description of the implementation methods, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the service calling device can be divided into different functional modules to complete all or part of the functions described above.

[0095] This application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be executed by computer instructions instructing related hardware. The program can be stored in the aforementioned computer-readable storage medium, and when executed, it can include the processes of the above method embodiments. The computer-readable storage medium can be any of the foregoing embodiments or memory. The aforementioned computer-readable storage medium can also be an external storage device of the aforementioned service invocation device, such as a plug-in hard drive, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the aforementioned service invocation device. Further, the aforementioned computer-readable storage medium can include both internal storage units of the aforementioned service invocation device and external storage devices. The aforementioned computer-readable storage medium is used to store the aforementioned computer program and other programs and data required by the aforementioned service invocation device. The aforementioned computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

[0096] This application also provides a computer program product comprising a computer program that, when run on a computer, causes the computer to execute any of the gas concentration detection methods provided in the above embodiments.

[0097] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gas concentration detection system, characterized in that, The application relates to a gas concentration detection device. The device comprises a light source radiation unit, an electro-optical modulation unit, a fiber gas detection unit, a photoelectric conversion unit and a digital signal processing unit. The electro-optical modulation unit is connected with the light source radiation unit, the fiber gas detection unit and the digital signal processing unit respectively, and the photoelectric conversion unit is connected with the fiber gas detection unit and the digital signal processing unit respectively. The electro-optical modulation unit is used for modulating an initial light signal emitted by the light source radiation unit according to an initial microwave signal to obtain a modulated light signal; wherein the modulated light signal changes linearly in a sweep frequency. The fiber gas detection unit is used for reflecting the modulated light signal to obtain a target reflected light signal and sending the target reflected light signal to the photoelectric conversion unit. The photoelectric conversion unit is used for converting the target reflected light signal into a target reflected microwave signal and sending the target reflected microwave signal to the digital signal processing unit. The digital signal processing unit is used for obtaining a target gas concentration according to the initial microwave signal emitted by the electro-optical modulation unit and the target reflected microwave signal.

2. The system of claim 1, wherein, The fiber gas detection unit comprises a light splitting unit and a plurality of fiber gas sensors. The light splitting unit is used for splitting the modulated light signal into a plurality of target emitted light signals and sending the plurality of target emitted light signals to corresponding fiber gas sensors respectively; and the light splitting unit is also used for receiving a plurality of target reflected light signals reflected by the plurality of target emitted light signals via the corresponding fiber gas sensors respectively.

3. The system of claim 2, wherein, The fiber gas detection unit further comprises a plurality of delay optical fibers connected with the light splitting unit and the plurality of fiber gas sensors respectively. The plurality of target emitted light signals are sent to the corresponding fiber gas sensors via the plurality of delay optical fibers respectively. The plurality of target reflected light signals are sent to the light splitting unit via the plurality of delay optical fibers respectively; and the plurality of delay optical fibers have different lengths.

4. The system of claim 3, wherein, The light splitting unit comprises a circulator and a light splitter; the circulator is connected with the electro-optical modulation unit, the light splitter and the photoelectric conversion unit respectively; and the light splitter is further connected with the plurality of delay optical fibers respectively. The circulator is used for sending the modulated light signal to the light splitter. The light splitter is used for splitting the modulated light signal into the plurality of target emitted light signals and sending the plurality of target emitted light signals to the corresponding delay optical fibers; and the light splitter is also used for receiving the plurality of target reflected light signals emitted by the plurality of delay optical fibers. The circulator is also used for sending the plurality of target reflected light signals emitted by the light splitter to the photoelectric conversion unit.

5. The system of claim 1, wherein, The photoelectric conversion unit comprises a dispersion unit and a photoelectric detector; the dispersion unit is connected with the fiber gas detection unit and the photoelectric detector respectively; and the photoelectric detector is further connected with the digital signal processing unit. The dispersion unit is configured to compensate dispersion of a target reflected light signal emitted by the optical fiber gas detection unit, to obtain a target reflected time delay signal, and to send the target reflected time delay signal to the photodetector. The photodetector is configured to perform photoelectric conversion on the target reflected time delay signal, to obtain a target microwave signal, and to send the target reflected microwave signal to the digital signal processing unit.

6. The system of claim 1, wherein, The digital signal processing unit comprises a signal processor, a data acquisition card and a frequency mixer, the frequency mixer is connected with the optical fiber gas detection unit, the electro-optical modulation unit and the data acquisition card respectively, and the signal processor is connected with the data acquisition card. The frequency mixer is configured to mix the initial microwave signal sent by the electro-optical modulation unit and the target reflected microwave signal, to obtain a beat frequency signal. The data acquisition card is configured to collect the beat frequency signal emitted by the frequency mixer, and to send the beat frequency signal to the signal processor. The signal processor is configured to obtain the target gas concentration change according to the beat frequency signal.

7. The system of claim 1, wherein, The electro-optical modulation unit comprises a microwave signal generator and an electro-optical modulator, the electro-optical modulator is connected with the light source radiation unit, the microwave signal generator and the optical fiber gas detection unit respectively. The microwave signal generator is configured to generate an initial microwave signal, and to send the microwave signal to the electro-optical modulator. The electro-optical modulator is configured to modulate the initial light signal emitted by the light source radiation unit according to the initial microwave signal, to obtain a modulated light signal.

8. The system of claim 7, wherein, The microwave signal generator is also connected with the digital signal processing unit. The digital signal processing unit is configured to receive the initial microwave signal sent by the microwave signal generator.

9. The system of claim 1, wherein, The digital signal processing unit is also connected with an external rescue center through an operator network, and is configured to send an alarm signal to the external rescue center when the target gas concentration change exceeds a preset concentration threshold.

10. The system of claim 9, wherein, The gas concentration detection system is embedded in a whole-house optical fiber networking system, and the whole-house optical fiber networking system accesses the operator network.

11. A method of detecting a concentration of a gas, characterized by, The method applied to the digital signal processing unit of the gas concentration detection system in any one of claims 1-9, the method comprises: obtaining a target gas concentration change according to an initial microwave signal and a target reflected microwave signal; wherein the initial microwave signal is emitted by an electro-optical modulation unit; the target reflected microwave signal is converted by a photoelectric conversion unit according to a target reflected light signal emitted by an optical fiber gas detection unit; the target reflected light signal is obtained by reflecting a modulated light signal by the optical fiber gas detection unit; the modulated light signal is obtained by modulating an initial light signal emitted by a light source radiation unit according to the initial microwave signal by the electro-optical modulation unit, and the modulated light signal changes linearly in frequency; and the target gas is a gas detected by the optical fiber gas detection unit.

12. The method of claim 11, wherein, The method of obtaining a target gas concentration change according to an initial microwave signal and a target reflected microwave signal comprises: obtaining a beat frequency signal according to the initial microwave signal and the target reflected microwave signal; In the case that the concentration of the target gas changes, the changed concentration of the target gas is determined according to the difference frequency signal; the target gas is a gas that can be detected by the target optical fiber gas sensor, and the target optical fiber gas sensor is any sensor in the plurality of optical fiber gas sensors.

13. The method of claim 12, wherein, The method further comprises: In the case that the concentration of the target gas does not change, the position of the target gas sensor is determined according to the difference frequency signal.

14. An electronic device, comprising: The computer device comprises a processor and a memory, the processor is coupled with the memory; the memory is used to store computer instructions, the computer instructions are loaded and executed by the processor to enable the computer device to implement the gas concentration detection method according to any one of claims 11 to 13.

15. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises computer execution instructions, when the computer execution instructions run on the computer, the computer execution instructions enable the computer to execute the gas concentration detection method according to any one of claims 11 to 13.

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