CN116124741B - Hydrogen concentration detection device - Google Patents
Hydrogen concentration detection device Download PDFInfo
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- CN116124741B CN116124741B CN202310421939.4A CN202310421939A CN116124741B CN 116124741 B CN116124741 B CN 116124741B CN 202310421939 A CN202310421939 A CN 202310421939A CN 116124741 B CN116124741 B CN 116124741B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a hydrogen concentration detection device, which comprises a hydrogen concentration sensor, a light source, an optical fiber bundle, a first photoelectric converter, a second photoelectric converter, a first data acquisition unit, a second data acquisition unit and a data processor, wherein the first photoelectric converter is connected with the first data acquisition unit; the hydrogen concentration sensor comprises a shell and two nano-particle films; the light source is configured to emit a laser beam toward the first scattering cavity and the second scattering cavity. The technical scheme provided by the invention has the beneficial effects that: the scattering cavity structure can enable the laser beam to scatter on the inner walls of the first scattering cavity and the second scattering cavity for multiple times, so that the coupling efficiency of the optical device and the large-area hydrogen-sensitive film is greatly improved; the temperature drift can be eliminated by adopting a double-light path and double-scattering cavity compensation structure; the nano-particle film is used as the hydrogen-sensitive material, so that the film falling caused by the phase change expansion of palladium after hydrogen absorption is effectively eliminated, the specific surface area of the sensitive material is increased, and the response speed and sensitivity of hydrogen concentration detection are improved.
Description
Technical Field
The invention relates to the technical field of hydrogen detection, in particular to a hydrogen concentration detection device.
Background
Hydrogen is used as a gas fuel and has the characteristics of large resource storage capacity, high combustion heat value and less pollution. Hydrogen is also an important chemical raw material, and has wide application in the fields of aerospace, fuel cell automobiles, metal smelting and chemical synthesis. Hydrogen is a very light gas with small molecular weight, the molecular weight is the smallest in the gas, and leakage is very easy to occur, and when the volume concentration of the hydrogen in the air reaches about 4% -75.6%, explosion is very easy to occur under the conditions of open fire, static electricity and the like. Therefore, the detection of hydrogen is very important. The traditional hydrogen detection sensor is based on the electrochemical reaction principle, and because the repeatability and stability of the chemical reaction are poor, the detection of the signal adopts an electric signal, and the electric signal is easy to generate electric spark and is easy to be interfered by electromagnetic interference, so that the accuracy and safety of the traditional hydrogen sensor can not meet the requirement of hydrogen detection. Therefore, the development of a safe and reliable hydrogen sensor has become an urgent need.
Because of the unique selectivity of metal palladium to hydrogen, palladium and a composite material thereof are mostly adopted as hydrogen sensitive elements in the current optical fiber hydrogen sensor, but the hydrogen sensitive materials in the current optical fiber sensor (for example, patent CN 209802982U) are difficult to realize large-area coupling, so that the sensitivity and the response speed of the sensor have a mutually restricted relationship, and the response saturation time is increased by increasing the thickness of a coupling sensitive film layer to increase the sensitivity, so that the diffusion distance of hydrogen atoms is prolonged; on the contrary, if the ultra-thin film is adopted to improve the diffusion speed, the detection precision is difficult to improve because the coupling quantity of the sensitive material is small and the total quantity of property change is weak.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a hydrogen concentration detection apparatus for solving the technical problems of low response speed and low sensitivity caused by low coupling efficiency between an optical fiber device and a hydrogen-sensitive film in the existing optical hydrogen sensor.
In order to achieve the above object, the present invention provides a hydrogen concentration detection apparatus, including a hydrogen concentration sensor, a light source, an optical fiber bundle, a first photoelectric converter, a second photoelectric converter, a first data collector, a second data collector, and a data processor;
the hydrogen concentration sensor comprises a shell and two nanoparticle films, a first scattering cavity and a closed second scattering cavity are arranged in the shell, micro ventilation holes communicated with the first scattering cavity are formed in the shell, the micro ventilation holes are used for allowing gas to be detected to pass through, the second scattering cavity is closed and isolated from external environment gas, the two nanoparticle films are respectively coated on the inner walls of the first scattering cavity and the second scattering cavity, the two nanoparticle films are made of the same material and comprise a plurality of nanoparticles, each nanoparticle comprises a core body and a shell layer, the core body is made of gold and is in a cubic shape, and the shell layer is spherical and is coated on the corresponding core body and is made of palladium;
the light source is used for emitting laser beams to the first scattering cavity and the second scattering cavity;
the optical fiber bundle is used for transmitting laser beams emitted by the light source and receiving the laser beams emitted by the first scattering cavity and the second scattering cavity;
the first photoelectric converter is used for receiving the laser beam emitted from the first scattering cavity after multiple scattering and converting the optical signal of the laser beam into a first electric signal;
the second photoelectric converter is used for receiving the laser beam emitted by the second scattering cavity after multiple scattering and converting the optical signal of the laser beam into a second electric signal;
the first data collector is used for receiving a first electric signal sent by the first photoelectric converter and amplifying the received electric signal to obtain a first amplified signal;
the second data collector is used for receiving a second electric signal sent by the second photoelectric converter and amplifying the received electric signal to obtain a second amplified signal;
the data processor is used for obtaining the hydrogen concentration in the gas to be detected according to the first amplified signal and the second amplified signal.
In some embodiments, the nuclei have a side length of 40nm.
In some embodiments, the shell layer has a thickness of 4-22nm.
In some embodiments, barium sulfate and teflon are used as inner wall coating materials on the inner walls of the first and second scattering cavities.
In some embodiments, the hydrogen concentration sensor further comprises a first emission probe and a second emission probe, wherein the first emission probe and the second emission probe are both fixed on the housing, an input end of the first emission probe is connected with the light source, an output end of the first emission probe is connected with the first scattering cavity, an input end of the second emission probe is connected with the light source, and an output end of the second emission probe is connected with the second scattering cavity.
In some embodiments, the optical fiber bundle is a Y-shaped optical fiber bundle, an input end of the Y-shaped optical fiber bundle is connected with the light source, and two output ends of the Y-shaped optical fiber bundle are respectively connected with the input end of the first transmitting probe and the input end of the second transmitting probe.
In some embodiments, the first scattering cavity and the second scattering cavity are one of regular hexagonal prism, rectangle, and cylinder in shape.
In some embodiments, the first data collector includes a first signal amplifier, an input end of the first signal amplifier is connected to the first photoelectric converter and is used for amplifying a first electric signal output by the first photoelectric converter, and an output end of the first signal amplifier is connected to the data processor.
In some embodiments, the second data collector includes a second signal amplifier, an input end of the second signal amplifier is connected to the second photoelectric converter and is used for amplifying a second electric signal output by the second photoelectric converter, and an output end of the second signal amplifier is connected to the data processor.
In some embodiments, the input end of the data processor is connected with the first data collector and the second data collector, and the hydrogen concentration to be measured is obtained through calculation of a difference algorithm.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: when the laser light source is used, laser beams are emitted to the first scattering cavity and the second scattering cavity through the light source, gas to be detected enters the first scattering cavity through the micro-ventilation holes, after hydrogen in the gas to be detected is absorbed by the nanoparticle film laid on the inner wall of the first scattering cavity, a shell layer in the nanoparticle film expands, so that the light intensity of the laser beams in the first scattering cavity is changed in the process of repeated reflection on the inner wall of the first scattering cavity, and the second scattering cavity is sealed and not contacted with the outside, and therefore the hydrogen concentration in the gas to be detected can be obtained by comparing the light intensity difference of the laser beams emitted by the first scattering cavity and the second scattering cavity. The technical proposal provided by the invention has the beneficial effects that: the scattering cavity structure can enable the laser beam to scatter on the inner walls of the first scattering cavity and the second scattering cavity for multiple times, so that the coupling efficiency of the optical device and the large-area hydrogen-sensitive film is greatly improved; the temperature drift can be eliminated by adopting a double-light path and double-scattering cavity compensation structure; the nano-particle film is used as the hydrogen-sensitive material, so that the film falling caused by the phase change expansion of palladium after hydrogen absorption is effectively eliminated, the specific surface area of the sensitive material is increased, and the response speed and sensitivity of hydrogen concentration detection are improved.
Drawings
FIG. 1 is a schematic diagram of a hydrogen concentration detecting apparatus according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of the hydrogen concentration sensor of fig. 1;
fig. 3 is a schematic cross-sectional structure of the hydrogen concentration sensor in fig. 2;
FIG. 4 is a schematic illustration of a nanoparticle film preparation process;
FIG. 5 is a simulation diagram of the variation of the brightness of the receiving probe;
in the figure: 1-hydrogen concentration sensor, 11-shell, 111-first scattering chamber, 1111-little bleeder vent, 112-second scattering chamber, 12-nanoparticle film, 13-first transmitting probe, 14-second transmitting probe, 15-first receiving probe, 16-second receiving probe, 17-inner wall coating material, 2-light source, 3-first photoelectric converter, 4-second photoelectric converter, 5-data processor, 6-optical fiber bundle, 7-first data collector, 8-second data collector.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
Referring to fig. 1-4, the present invention provides a hydrogen concentration detecting apparatus, which includes a hydrogen concentration sensor 1, a light source 2, an optical fiber bundle 6, a first photoelectric converter 3, a second photoelectric converter 4, a first data collector 7, a second data collector 8 and a data processor 5.
The hydrogen concentration sensor 1 comprises a housing 11 and two nanoparticle films 12, a first scattering cavity 111 and a closed second scattering cavity 112 are arranged in the housing 11, a micro-ventilation hole 1111 communicated with the first scattering cavity 111 is formed in the housing 11, the micro-ventilation hole 1111 is used for allowing gas to pass through, the aperture of the micro-ventilation hole 1111 is smaller than the diameter of particles in air, so that only gas molecules can pass through, the particles and dust in air are not allowed to pass through, the second scattering cavity 112 is closed and isolated from the outside environment gas, the two nanoparticle films 12 are respectively coated on the inner walls of the first scattering cavity 111 and the second scattering cavity 112, the two nanoparticle films 12 are made of the same material and comprise a plurality of nanoparticles, each nanoparticle film comprises a nuclear body and a shell layer, the nuclear body is made of gold, the shell layer is spherical and is coated on the corresponding nuclear body, the palladium is made of palladium, the hydrogen is expanded after being absorbed by the palladium, the concentration of scattered light can be increased, and the contact area of the hydrogen concentration of the particle concentration sensor is increased, and the sensitivity of the system is improved.
The light source 2 is configured to emit a laser beam toward the first scattering chamber 111 and the second scattering chamber 112.
The optical fiber bundle 6 is used for transmitting the laser beam emitted by the light source 2 and receiving the laser beam emitted by the first scattering cavity 111 and the second scattering cavity 112;
the first photoelectric converter 3 is configured to receive the laser beam emitted from the first scattering cavity 111 after multiple scattering, and convert an optical signal of the laser beam into a first electrical signal.
The second photoelectric converter 4 is configured to receive the laser beam emitted from the second scattering cavity 112 after multiple scattering, and convert an optical signal of the laser beam into a second electrical signal.
The first data collector 7 is configured to receive a first electrical signal sent by the first photoelectric converter 3, and amplify the received electrical signal to obtain a first amplified signal;
the second data collector 8 is configured to receive a second electrical signal sent by the second photoelectric converter 4, and amplify the received electrical signal to obtain a second amplified signal;
the data processor 5 is configured to obtain the hydrogen concentration in the gas to be detected according to the first amplified signal and the second amplified signal.
When in use, the light source 2 emits laser beams to the first scattering cavity 111 and the second scattering cavity 112, the gas to be detected enters the first scattering cavity 111 through the micro-ventilation holes 1111, after the hydrogen in the gas to be detected is absorbed by the nanoparticle film 12 laid on the inner wall of the first scattering cavity 111, the shell layer in the nanoparticle film 12 expands, so that the light intensity of the scattered light changes in the process that the laser beams in the first scattering cavity 111 are reflected on the inner wall of the first scattering cavity 111 for multiple times, and the second scattering cavity 112 is sealed and not contacted with the outside, therefore, the hydrogen concentration in the gas to be detected can be obtained by comparing the light intensity difference of the laser beams emitted by the first scattering cavity 111 and the second scattering cavity 112. The technical proposal provided by the invention has the beneficial effects that: the scattering cavity structure can enable the laser beam to scatter on the inner walls of the first scattering cavity 111 and the second scattering cavity 112 for multiple times, so that the coupling efficiency of the optical device and the large-area hydrogen-sensitive film is greatly improved; the temperature drift can be eliminated by adopting a double-light path and double-scattering cavity compensation structure; the nano-particle film is used as the hydrogen-sensitive material, so that the film falling caused by the phase change expansion of palladium after hydrogen absorption is effectively eliminated, the specific surface area of the sensitive material is increased, and the response speed and sensitivity of hydrogen concentration detection are improved.
In order to enhance the effect of the nucleus, please refer to fig. 1 and 2, in a preferred embodiment the nucleus has a side length of 40nm.
In order to implement the function of the shell layer, referring to fig. 1 and 2, in a preferred embodiment, the thickness of the shell layer is 4-22nm.
In order to enhance the scattering effect, referring to fig. 1-4, in a preferred embodiment, barium sulfate (BaSO) is used on the inner walls of the first scattering chamber 111 and the second scattering chamber 112 4 ) And Teflon (PTFE) as the inner wall coating material 17.
As shown in fig. 4, the present invention further provides a preparation method of the nanoparticle film 12, which specifically includes the following steps:
(1) In CATB (7.5)10 -2 M) and HAuCl 4 •3H 2 O（2.5/>10 -4 Adding NaBH of 4 ℃ into the mixed solution of M) 4 Stirring to obtain gold seed solution.
(2) In HAuCl 4 •3H 2 O（2.510 -4 CTAB (1.6 +.M) was added sequentially to M)>10 -2 M) and Ascorbic Acid (AA) (6.0->10 -3 M), stirring and mixing to obtain the gold seed growth solution.
(3) Mixing the solution in the step (1) with the solution in the step (2) according to a volume ratio of 1:10, mixing, and carrying out ultrasonic oscillation for 2min to obtain the cubic gold core solution with the size of about 40nm.
(4) PdCl is added to 2 The solution is dissolved in 20mM hydrochloric acid standard solution to obtain H 2 PdCl 4 (10 mM) solution was used as the Pd shell growth solution. Taking 10ml of the solution in the step (3), and adding 25 respectivelyStirring for 2h at 50deg.C, and reducing Pd with Ascorbic Acid (AA) in the growth solution 2+ Ions are made to grow on the gold cores, and finally nanoparticle solutions with diameters of 44nm are prepared.
(5) And (3) mixing the nanoparticle solution obtained in the step (4) with high-pressure nitrogen gas flow for liquefying, so that the micro-droplets wrapping the particles are rapidly dried on the inner wall of the scattering cavity, and a nanoparticle film with good dispersibility is formed.
In order to facilitate the introduction of the laser beam into the first scattering cavity 111 and the second scattering cavity 112, referring to fig. 1-3, in a preferred embodiment, the hydrogen concentration sensor 1 further includes a first emission probe 13 and a second emission probe 14, where the first emission probe 13 and the second emission probe 14 are both fixed on the housing 11, an input end of the first emission probe 13 is connected to the light source 2, an output end of the first emission probe 13 is connected to the first scattering cavity 111, an input end of the second emission probe 14 is connected to the light source 2, and an output end of the second emission probe 14 is connected to the second scattering cavity 112.
In order to facilitate guiding the laser beam after multiple scattering out of the first scattering cavity 111 and the second scattering cavity 112, referring to fig. 1-3, in a preferred embodiment, the hydrogen concentration sensor 1 further includes a first receiving probe 15 and a second receiving probe 16, where the first receiving probe 15 and the second receiving probe 16 are both fixed on the housing 11, an input end of the first receiving probe 15 is connected to the first scattering cavity 111, an output end of the first receiving probe 15 is connected to the first photoelectric converter 3, an input end of the second receiving probe 16 is connected to the second scattering cavity 112, and an output end of the second transmitting probe 14 is connected to the second photoelectric converter 4.
In order to divide the laser light emitted from the light source 2 into two beams, referring to fig. 1, in a preferred embodiment, the optical fiber bundle 6 is a Y-shaped optical fiber bundle, an input end of the Y-shaped optical fiber bundle is connected to the light source 2, and two output ends of the Y-shaped optical fiber bundle are respectively connected to an input end of the first transmitting probe 13 and an input end of the second transmitting probe 14.
In order to implement multiple scattering of the laser beam in the first scattering cavity 111 and the second scattering cavity 112, referring to fig. 1-3, in a preferred embodiment, the first scattering cavity 111 and the second scattering cavity 112 are one of regular hexagonal prism, rectangle and cylinder.
In this embodiment, the first scattering cavity 111 and the second scattering cavity 112 have a regular hexagonal prism shape.
As shown in fig. 5, it can be known from the characteristics of langer's law that when the light signal enters the regular hexagonal prism type scattering cavity from the transmitting probe and is reflected for multiple times, the light intensity L of the receiving probe S The method comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,is the input light intensity; a is the side length of the bottom surface of the regular hexagonal prism; h is the height of a regular hexagonal prism; />The effective scattering rate of the nanoparticle film; f is the percentage of the receiving probe to the area of the inner wall of the regular hexagonal prism type scattering cavity. Simulation shows that when the effective scattering rate of the nanoparticle film is +.>The effective scattering rate of the nanoparticle film is +.A.A.in the range of 90% to 100% open area ratio f is in the range of 0% to 5 +.>Slight changes in->Can lead to the change of the brightness of the receiving probe +.>. The result shows that the regular hexagonal prism type scattering cavity structure can effectively improve the coupling modulation intensity between the nanoparticle film and the optical signal.
In order to improve the accuracy of the detection result, referring to fig. 1, in a preferred embodiment, the first data collector 7 includes a first signal amplifier, an input end of the first signal amplifier is connected to the first photoelectric converter 3, and is used for amplifying the first electrical signal output by the first photoelectric converter 3, and an output end of the first signal amplifier is connected to the data processor 5. The second data collector 8 includes a second signal amplifier, an input end of the second signal amplifier is connected to the second photoelectric converter 4 and is used for amplifying a second electrical signal output by the second photoelectric converter 4, and an output end of the second signal amplifier is connected to the data processor 5.
In order to specifically implement the function of the data processor 5, referring to fig. 1, in a preferred embodiment, the input end of the data processor 5 is connected to the first data collector 7 and the second data collector 8, and the concentration of the hydrogen to be measured is calculated by a differential algorithm.
For a better understanding of the present invention, the following describes in detail the operation of the hydrogen concentration detection apparatus provided by the present invention with reference to fig. 1 to 5: when in use, the light source 2 emits laser beams to the first scattering cavity 111 and the second scattering cavity 112, the gas to be detected enters the first scattering cavity 111 through the micro-ventilation holes 1111, after the hydrogen in the gas to be detected is absorbed by the nanoparticle film 12 laid on the inner wall of the first scattering cavity 111, the shell layer in the nanoparticle film 12 expands, so that the light intensity of the scattered light changes in the process that the laser beams in the first scattering cavity 111 are reflected on the inner wall of the first scattering cavity 111 for multiple times, and the second scattering cavity 112 is sealed and not contacted with the outside, therefore, the hydrogen concentration in the gas to be detected can be obtained by comparing the light intensity difference of the laser beams emitted by the first scattering cavity 111 and the second scattering cavity 112. The technical proposal provided by the invention has the beneficial effects that: the scattering cavity structure can enable the laser beam to scatter on the inner walls of the first scattering cavity 111 and the second scattering cavity 112 for multiple times, so that the coupling efficiency of the optical device and the large-area hydrogen-sensitive film is greatly improved; the temperature drift can be eliminated by adopting a double-light path and double-scattering cavity compensation structure; the nano-particle film is used as the hydrogen-sensitive material, so that the film falling caused by the phase change expansion of palladium after hydrogen absorption is effectively eliminated, the specific surface area of the sensitive material is increased, and the response speed and sensitivity of hydrogen concentration detection are improved.
In summary, the technical scheme provided by the invention has the following beneficial effects:
(1) The scattering cavity structure enables the optical device to be efficiently coupled with the large-area hydrogen-sensitive film, so that the sensor has high sensitivity while having high response speed;
(2) The double-light-path and double-scattering-cavity compensation structure is used, so that the influence of system errors such as light source fluctuation on a result is avoided, and the detection precision of the hydrogen sensor is improved;
(3) Changing the continuous mode into a discontinuous mode by using the nano particle film, and eliminating the influence of palladium hydrogen absorption phase change;
(4) The nanoparticle film is used, so that the contact area of hydrogen molecules and the hydrogen-sensitive film can be effectively increased, and the response speed of the sensor is improved;
(5) The detection air chamber and the reference air chamber are arranged, the results of the detection air chamber and the reference air chamber are subtracted, and the influence of the ambient temperature on the measurement result is eliminated, so that the sensor is suitable for detecting the concentration of hydrogen in various complex environments.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.
Claims (8)
1. The hydrogen concentration detection device is characterized by comprising a hydrogen concentration sensor, a light source, an optical fiber bundle, a first photoelectric converter, a second photoelectric converter, a first data acquisition unit, a second data acquisition unit and a data processor;
the hydrogen concentration sensor comprises a shell and two nanoparticle films, a first scattering cavity and a closed second scattering cavity are arranged in the shell, micro ventilation holes communicated with the first scattering cavity are formed in the shell, the micro ventilation holes are used for allowing gas to be detected to pass through, the second scattering cavity is closed and isolated from external environment gas, the two nanoparticle films are respectively coated on the inner walls of the first scattering cavity and the second scattering cavity, the two nanoparticle films are made of the same material and comprise a plurality of nanoparticles, each nanoparticle comprises a core body and a shell layer, the core body is made of gold and is in a cubic shape, and the shell layer is spherical and is coated on the corresponding core body and is made of palladium; the shape of the first scattering cavity and the second scattering cavity is one of regular hexagonal prism shape, rectangle shape and cylinder shape; the inner wall of the first scattering cavity and the inner wall of the second scattering cavity are made of barium sulfate and Teflon as inner wall coating materials;
the light source is used for emitting laser beams to the first scattering cavity and the second scattering cavity;
the optical fiber bundle is used for transmitting laser beams emitted by the light source and receiving the laser beams emitted by the first scattering cavity and the second scattering cavity;
the first photoelectric converter is used for receiving the laser beam emitted from the first scattering cavity after multiple scattering and converting the optical signal of the laser beam into a first electric signal;
the second photoelectric converter is used for receiving the laser beam emitted by the second scattering cavity after multiple scattering and converting the optical signal of the laser beam into a second electric signal;
the first data collector is used for receiving a first electric signal sent by the first photoelectric converter and amplifying the received electric signal to obtain a first amplified signal;
the second data collector is used for receiving a second electric signal sent by the second photoelectric converter and amplifying the received electric signal to obtain a second amplified signal;
the data processor is used for obtaining the hydrogen concentration in the gas to be detected according to the first amplified signal and the second amplified signal.
2. The hydrogen concentration detection apparatus according to claim 1, wherein the side length of the core body is 40nm.
3. The hydrogen concentration detection apparatus according to claim 1, wherein the thickness of the shell layer is 4 to 22nm.
4. The hydrogen concentration detection apparatus according to claim 1, wherein the hydrogen concentration sensor further comprises a first emission probe and a second emission probe, the first emission probe and the second emission probe are both fixed on the housing, an input end of the first emission probe is connected with the light source through an optical fiber, an output end of the first emission probe is connected with the first scattering cavity through an optical fiber, an input end of the second emission probe is connected with the light source through an optical fiber, and an output end of the second emission probe is connected with the second scattering cavity through an optical fiber.
5. The hydrogen concentration detection apparatus according to claim 4, wherein the optical fiber bundle is a Y-shaped optical fiber bundle, an input end of the Y-shaped optical fiber bundle is connected to the light source, and two output ends of the Y-shaped optical fiber bundle are connected to the input end of the first transmitting probe and the input end of the second transmitting probe, respectively.
6. The hydrogen concentration detection apparatus according to claim 1, wherein the first data collector includes a first signal amplifier, an input terminal of the first signal amplifier is connected to the first photoelectric converter and is configured to amplify a first electrical signal output from the first photoelectric converter, and an output terminal of the first signal amplifier is connected to the data processor.
7. The hydrogen concentration detection apparatus according to claim 1, wherein the second data collector includes a second signal amplifier, an input terminal of the second signal amplifier is connected to the second photoelectric converter and is configured to amplify a second electrical signal output from the second photoelectric converter, and an output terminal of the second signal amplifier is connected to the data processor.
8. The hydrogen concentration detection apparatus according to claim 1, wherein an input end of the data processor is connected to the first data collector and the second data collector, and the hydrogen concentration to be detected is calculated by a differential algorithm.
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