CN110749572A - Novel graphene optical fiber gas sensor measuring system and method for measuring hydrogen sulfide gas by using same - Google Patents
Novel graphene optical fiber gas sensor measuring system and method for measuring hydrogen sulfide gas by using same Download PDFInfo
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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
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02047—Dual mode fibre
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
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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
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
Abstract
The invention discloses a novel graphene optical fiber gas sensor measuring system and a method for measuring hydrogen sulfide gas by the same, wherein the method comprises the following steps: the system comprises a broadband light source, an optical fiber sensor, a spectrometer, a computer and an alarm device, wherein the optical fiber sensor and the spectrometer are connected through optical fibers; the optical fiber sensor is structurally characterized in that two ends of a photonic crystal optical fiber are respectively connected with a first multimode optical fiber and a second multimode optical fiber, two ends of the first multimode optical fiber and the second multimode optical fiber are respectively welded with a first single mode optical fiber and a second single mode optical fiber, and the surface of the photonic crystal optical fiber is coated with a layer of titanium dioxide/aminated graphene quantum dot composite sensitive film. The sensor has the advantages of good selectivity, external interference resistance and low cost, and is expected to be applied to the detection of the hydrogen sulfide gas in the environment of 0-55 ppm.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to a novel graphene optical fiber gas sensor measuring system and a method for measuring hydrogen sulfide gas by using the same.
Background
The toxic pollution gases in the air pose a major threat and harm to human health and public safety, especially hydrogen sulfide (H)2S) the gas is colorless, inflammable and extremely corrosive, and can be killed at extremely low concentration, thus seriously affecting the health of people. Therefore, the development of the high-sensitivity gas sensor for rapidly detecting the hydrogen sulfide gas in real time has important theoretical and practical application values. Since the discovery of graphene, it has excellent room temperature detectability for gas molecules due to its extremely large specific surface area and excellent electrical characteristics. However, when the single graphene is used as a sensitive material of a gas sensor, the single graphene is limited by intrinsic folds and an electron accumulation effect, and has the defects of unsaturated response, difficult recovery, poor selectivity and the like.
The optical fiber sensing technology is a new high technology with a wide prospect in development. The optical fiber has a plurality of special properties in the process of transmitting information, for example, the energy loss is very small when the optical fiber transmits information, thereby bringing great convenience to remote measurement. The optical fiber material has stable performance, is not interfered by an electromagnetic field, and is kept unchanged under severe environments such as high temperature, high pressure, low temperature, strong corrosion and the like, so that the optical fiber sensor is developed rapidly from the appearance to the present. Therefore, how to use the optical fiber sensing technology to manufacture a gas sensor for detecting the concentration of low-concentration hydrogen sulfide, so that the gas sensor has the effects of stable operation, good detection effect, fast response time, high precision and reliability and the like, becomes a problem to be further considered.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel graphene optical fiber gas sensor measuring system and a method for measuring hydrogen sulfide gas by the same, aiming at solving the problem of detecting low-concentration hydrogen sulfide gas by an optical fiber gas sensor and improving the detection precision and reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel optical fiber hydrogen sulfide gas sensor measuring system is characterized by comprising: the spectrometer comprises a broadband light source, an optical fiber sensor and a spectrometer, wherein the optical fiber sensor and the spectrometer are connected through an optical fiber; the optical fiber sensor structure is composed of a first single-mode optical fiber, a first multimode optical fiber, a photonic crystal optical fiber, a second multimode optical fiber and a second single-mode optical fiber, wherein two ends of the photonic crystal optical fiber are respectively connected with the first multimode optical fiber and the second multimode optical fiber, and two ends of the first multimode optical fiber and the second multimode optical fiber are respectively welded with the first single-mode optical fiber and the second single-mode optical fiber.
Preferably, the surface of the photonic crystal fiber is coated with a layer of titanium dioxide/aminated graphene quantum dot composite sensitive film.
Preferably, the lengths of the first multimode fiber and the second multimode fiber are both 0.3cm, and the length of the photonic crystal fiber is 4.5 cm.
The invention further discloses a detection method of hydrogen sulfide gas, which comprises the following specific steps:
step 1: obtaining a spectrogram of a sensor interferometer of the photonic crystal fiber with the titanium dioxide/aminated graphene quantum dot coating under the condition without hydrogen sulfide gas by adopting the gas sensor detection system;
step 2: configured concentrations of H were 10ppm, 20ppm, 30ppm, 40ppm, 50 ppm and 55ppm, respectively2S gas, hydrogen sulfide gas with different concentrations is introduced into a gas sensor measuring system through a gas inlet 2, the spectrum of a spectrometer is selected to be 1538.9nm, and a spectrogram of the spectrometer under different hydrogen sulfide concentrations is obtained under a given spectrum through observation;
and step 3: selecting the central wavelength of one section of wave peak in the spectrogram in the step 1, selecting the central wavelength of the same wave peak in the spectrogram of hydrogen sulfide gas with different concentrations in the step 2, and obtaining p-m-nc through linear fitting, namely c-m (m-p)/n, wherein p is the central wavelength of the wave peak in the detection spectrum of the hydrogen sulfide gas chamber, m is the central wavelength of the wave peak in the detection spectrum without containing hydrogen sulfide gas, n is the offset of every 1ppm of hydrogen sulfide gas in the spectrum, and c is the concentration of the hydrogen sulfide gas;
and 4, step 4: and putting the gas sensor detection system into a hydrogen sulfide gas chamber to be detected, acquiring a spectrogram detected by the gas chamber, selecting the central wavelength of one section of wave peak, and substituting the central wavelength into a formula c ═ m-p)/n to obtain the concentration of the hydrogen sulfide gas.
By adopting the scheme, the optical fiber hydrogen sulfide gas sensor measuring system is provided with the optical fiber sensor formed by sequentially welding the single-mode optical fiber, the multi-mode optical fiber, the photonic crystal optical fiber coated with the titanium dioxide/aminated graphene quantum dot composite sensitive film, the multi-mode optical fiber and the single-mode optical fiber, the titanium dioxide can effectively improve the sensitivity of the optical fiber sensor to hydrogen sulfide gas, the movement of an interference peak is detected by the spectrum detector, and the concentration of hydrogen sulfide to be detected is obtained by linear fitting, so that the concentration of the hydrogen sulfide gas is monitored. The sensor has good selectivity, external interference resistance and low cost, and is expected to be applied to the detection of hydrogen sulfide gas in the environment of 0-55 ppm.
Drawings
FIG. 1 is a schematic structural diagram of a fiber-optic hydrogen sulfide sensor device in an embodiment of the invention;
FIG. 2 is a schematic view of a fiber optic sensor in an embodiment of the invention;
FIG. 3 is a diagram of interference waveforms corresponding to photonic crystal fibers of different lengths in accordance with one embodiment of the present invention
FIG. 4 is a graph of measured shifts in the detection wavelength of hydrogen sulfide gas at different concentrations in an embodiment of the present invention;
in the figure: 1. a broadband light source; 2. an air inlet; 3. an optical fiber sensor; 4. an air outlet; 5. a spectrometer; 6. a first single mode optical fiber; 7. a first multimode optical fiber; 8. a photonic crystal fiber; 9. a second multimode optical fiber; 10. a second single mode optical fiber.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention discloses optical fiber hydrogen sulfide gas sensor measurement. Fig. 1 is a schematic diagram of a measurement system of a fiber-optic hydrogen sulfide gas sensor. The sensor measuring system comprises a broadband light source 1, an optical fiber sensor 3 and a spectrometer 5 which are connected through optical fibers, the system can be connected with a computer and a reporting device, and an air inlet 2 and an air outlet 4 are arranged at two ends of the optical fiber sensor 3. The gas inlet 2 and the gas outlet 4 are used for gas inlet and outlet when gas is detected.
As shown in fig. 2, the optical fiber sensor 3 of the present invention is composed of a first single mode fiber 6, a first multimode fiber 7, a photonic crystal fiber 8, a second multimode fiber 9, and a second single mode fiber 10, wherein two ends of the photonic crystal fiber 8 are respectively connected to the first multimode fiber 7 and the second multimode fiber 9, and two ends of the first multimode fiber 7 and the second multimode fiber 9 are respectively welded to the first single mode fiber 6 and the second single mode fiber 10; wherein, the surface of the photonic crystal fiber 8 is coated with a layer of titanium dioxide/aminated graphene quantum dot composite sensitive film. When hydrogen sulfide gas enters the optical fiber sensor 3 through the gas inlet 2, the hydrogen sulfide gas is processed and analyzed by the first single-mode optical fiber 6, the first multi-mode optical fiber 7, the photonic crystal optical fiber 8, the second multi-mode optical fiber 9 and the second single-mode optical fiber 10 in the optical fiber sensor 3, the sensitivity of the optical fiber sensor to the hydrogen sulfide gas is improved through the titanium dioxide/aminated graphene quantum dot composite sensitive film covered on the surface of the photonic crystal optical fiber 8, the movement of an interference peak is detected through a spectrum detector, and therefore the concentration of the hydrogen sulfide gas is monitored. The sensor has good selectivity, external interference resistance and low cost, and is expected to be applied to the detection of hydrogen sulfide gas in the environment of 0-55 ppm.
Photonic Crystal Fiber (PCF) is a special Fiber with two-dimensional periodic refractive index change in a cladding region, and can be prepared by introducing an air hole structure or a multi-component material, the cladding microstructure enables the PCF to become a unique optical waveguide and has the characteristics of dispersion adjustability, transmission controllability and the like, and the characteristics are closely related to the Fiber structure, namely the characteristics of the Photonic Crystal Fiber can be changed by changing structural parameters. In the sensor, two ends of two sections of single-mode fibers are respectively welded with the multimode fibers, the photonic crystal fibers plated with the titanium dioxide/aminated graphene quantum dot composite films are welded in the middle of the multimode fibers through a welding machine, air holes of the photonic crystal fibers collapse due to discharge of electrodes of the welding machine in a welding area of the multimode fibers and the photonic crystal fibers, a first collapse layer 11 and a second collapse layer 12 are formed, the collapse layers form similar coreless fibers, and accordingly a Mach-Zehnder interferometer is formed. Photonic crystal fibers with different lengths are built into a Mach-Zehnder interference structure, and the number of interference wave peaks and interference peaks is observed through a spectrometer to confirm that the optimal interference effect can be found, so that the optimal length of the photonic crystal fiber of the gas sensor can be found. Experiments verify that in the optical fiber sensor, the longer the length of the photonic crystal optical fiber is, the more the number of the obtained interference wave peaks is, namely the denser the interference peaks are; the shorter the length of the photonic crystal is, the lower the number of interference peaks obtained, and even the unsmooth peaks appear. As shown in FIG. 3, the experiment verifies the corresponding interference waveforms when the lengths of the photonic crystal fiber are 6.5cm, 4.5cm, 4cm and 3cm respectively, and when the length of the photonic crystal fiber is 4.5cm, the peak is smooth, the interference peak is obvious, and thus the length is the optimal length. Comprehensively considering the number of wave crests and the curve smoothness, when detecting hydrogen sulfide gas, the lengths of the first multimode fiber and the second multimode fiber are both 0.3cm, and the length of the photonic crystal fiber is 4.5 cm.
The graphene is a layer of dense carbon atoms wrapped on a honeycomb crystal lattice, and the carbon atoms are arranged into a two-position structure, similar to a graphite monoatomic layer, and have outstanding heat-conducting property and mechanical property. When gas is adsorbed to the surface of graphene, charge transfer can occur between gas molecules and the graphene, so that the density of carrier electrons or holes is changed, and the conductivity of the graphene is further changed. Due to the fact that the graphene has a large specific surface area due to the two-dimensional plane structure, the graphene can have high sensitivity when adsorbing gas molecules. Meanwhile, oxygen-containing groups on the surface of the graphene can form hydrogen bonds with water and OH, so that the ion density of the surface can be sensitively sensed. A large number of functional groups such as hydroxyl, epoxy, carbonyl and carboxyl exist on graphene oxide. Therefore, the graphene is compounded with other functional gas-sensitive materials, such as titanium dioxide, so that the sensitivity of the graphene-based gas sensor can be further improved.
The working principle of the optical fiber sensor is as follows: light in the broadband light source 1 enters the first multimode fiber 7 through the first single-mode fiber 6, so that the mode of a light field is increased, then the light enters the first collapse layer 11 of the photonic crystal fiber 8 from the first multimode fiber 7, the collapse layer is equivalent to a coreless fiber, the light expands in the first collapse layer 11, one part of the light is coupled into the fiber core of the photonic crystal fiber and is transmitted in the fiber core mode, the other part of the light is coupled into the cladding of the photonic crystal fiber and is continuously transmitted in the cladding mode, the light enters the second collapse layer 12 after passing through the photonic crystal fiber 8, the light is converged into the second single-mode fiber 10 through the second multimode fiber 9, an interfered spectrum is formed and transmitted into a spectrometer, and the spectrometer observes and outputs a spectrogram in real time. The computer calculates the spectrogram output by the spectrometer, and sets a certain threshold, but after detecting that the concentration of the hydrogen sulfide exceeds the certain threshold, the alarm device gives an alarm.
The method for detecting hydrogen sulfide gas by the sensor comprises the following steps:
step 1: obtaining a spectrogram of a sensor interferometer of a photonic crystal optical fiber with a titanium dioxide/aminated graphene quantum dot coating under the condition without hydrogen sulfide gas by adopting the graphene optical fiber gas sensor detection system;
step 2: configured concentrations of H were 10ppm, 20ppm, 30ppm, 40ppm, 50 ppm and 55ppm, respectively2S gas, hydrogen sulfide gas with different concentrations is introduced into a gas sensor measuring system through a gas inlet 2, the spectrum of a spectrometer is selected to be 1538.9nm, and a spectrogram of the spectrometer under different hydrogen sulfide concentrations is obtained under a given spectrum by observing the spectrometer, as shown in figure 4;
the output light intensity of the optical fiber Mach-Zehnder interference gas sensor can be expressed as follows:
in the formula Icore、IcladdingExpressed as the intensity of light in the core and in the cladding respectively in the interference phenomenon,expressed as the phase difference between the core mode and the cladding mode, i.e.
Wherein λ ismIs the wavelength of the m-order interference, L is the length of the intermediate PCF, Δ neffIs the effective refractive index of the core of the optical fiber
And the effective refractive index of the cladding
Is obtained whenEqual to (2m +1) pi, the light in the core and cladding satisfy interference cancellation, i.e., interference peaks are generated. The m-order interference peak can be expressed as:
the length of L of the titanium dioxide/aminated graphene quantum dot composite film coated on the surface of the PCF in the sensitive area is about 4.5cm, when the sensitive film coated on the surface of the cladding adsorbs gas, the cladding and the composite film of the PCF can be regarded as a cladding, the effective refractive index of the cladding is changed, and the refractive index of a fiber core is unchanged, so that the m-order interference peak is changed along with the change of the effective refractive index of the cladding, and the variable quantity can be expressed as
As can be seen from equation (4), when the effective refractive index of the cladding changes, the interference peak shifts, if anyWhen it becomes large, (Δ n)eff+ Δ n) decreases, i.e., Δ n is negative, the interference peak is blue shifted. Information on the movement of the interference peak can be observed by the spectrometer.
As shown in fig. 3, with the introduction of H2The concentration of S gas is increased, and the output spectrum presents an obvious blue shift phenomenon. The titanium dioxide/aminated graphene quantum dot sensitive film in the sensing area adsorbs H2The S gas molecules increase the refractive index of the cladding, so that the difference between the effective refractive indexes of the fiber core and the cladding is increased, the central wavelength is subjected to blue shift, and the experimental result is consistent with theoretical analysis.
Along with the increase of the concentration of the introduced hydrogen sulfide gas, the output spectrum of the gas sensor shows an obvious blue shift phenomenon, and the main reasons are as follows: when the graphene nano coating on the cladding of the photonic crystal fiber section is contacted with hydrogen sulfide, the refractive index of the cladding is increased, the refractive index of the fiber core is unchanged, and the absolute value of the refractive index difference is also increased along with the increase of the concentration of hydrogen sulfide gas. Therefore, as the gas concentration increases, the output spectrum of the sensor will undergo a blue shift.
And step 3: selecting the central wavelength of one section of wave peak in the spectrogram in the step 1, selecting the central wavelength of the same wave peak in the spectrogram of hydrogen sulfide gas with different concentrations in the step 2, and obtaining p-m-nc through linear fitting, namely c-m (m-p)/n, wherein p is the central wavelength of the wave peak in the detection spectrum of the hydrogen sulfide gas chamber, m is the central wavelength of the wave peak in the detection spectrum without containing hydrogen sulfide gas, n is the offset of every 1ppm of hydrogen sulfide gas in the spectrum, and c is the concentration of the hydrogen sulfide gas;
and 4, step 4: and putting the gas sensor detection system into a hydrogen sulfide gas chamber to be detected, acquiring a spectrogram detected by the gas chamber, selecting the central wavelength of one section of wave peak, and substituting the central wavelength into a formula c ═ m-p)/n to obtain the concentration of the hydrogen sulfide gas.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (5)
1. The utility model provides a novel graphite alkene optic fibre gas sensor measurement system which characterized in that includes: the device comprises a broadband light source (1), an optical fiber sensor (3) and a spectrometer (5) which are connected through optical fibers, a computer and an alarm device, wherein an air inlet (2) and an air outlet (4) are formed in two ends of the optical fiber sensor (3); the optical fiber sensor (3) is structurally composed of a first single-mode optical fiber (6), a first multimode optical fiber (7), a photonic crystal optical fiber (8), a second multimode optical fiber (9) and a second single-mode optical fiber (10), wherein two ends of the photonic crystal optical fiber (8) are respectively connected with the first multimode optical fiber (7) and the second multimode optical fiber (9), and two ends of the first multimode optical fiber (7) and the second multimode optical fiber (9) are respectively welded with the first single-mode optical fiber (6) and the second single-mode optical fiber (10).
2. The novel graphene optical fiber gas sensor measuring system according to claim 1, wherein the surface of the photonic crystal fiber (8) is coated with a graphene quantum dot composite sensitive film.
3. The novel optical fiber hydrogen sulfide gas sensor measuring system as claimed in claim 2, wherein the graphene quantum dot composite sensitive film can be a titanium dioxide/aminated graphene quantum dot composite sensitive film.
4. The novel graphene fiber gas sensor measurement system according to claim 3, wherein the lengths of the first multimode fiber (7) and the second multimode fiber (9) are both 0.3cm, and the length of the photonic crystal fiber (8) is 4.5 cm.
5. A method for detecting hydrogen sulfide gas, comprising: the novel graphene optical fiber gas sensor measuring system of any one of claims 1 to 4 is manufactured according to the following steps:
step 1: obtaining a spectrogram of a sensor interferometer of the photonic crystal fiber with the titanium dioxide/aminated graphene quantum dot coating under the condition without hydrogen sulfide gas by adopting the graphene fiber gas sensor detection system;
step 2: configured concentrations of H were 10ppm, 20ppm, 30ppm, 40ppm, 50 ppm and 55ppm, respectively2S gas, hydrogen sulfide gas with different concentrations is introduced into a gas sensor measuring system through a gas inlet 2, the spectrum of a spectrometer is selected to be 1538.9nm, and a spectrogram of the spectrometer under different hydrogen sulfide concentrations is obtained under a given spectrum through observation;
and step 3: selecting the central wavelength of one section of wave peak in the spectrogram in the step 1, selecting the central wavelength of the same wave peak in the spectrogram of hydrogen sulfide gas with different concentrations in the step 2, and obtaining p-m-nc through linear fitting, namely c-m (m-p)/n, wherein p is the central wavelength of the wave peak in the detection spectrum of the hydrogen sulfide gas chamber, m is the central wavelength of the wave peak in the detection spectrum without containing hydrogen sulfide gas, n is the offset of every 1ppm of hydrogen sulfide gas in the spectrum, and c is the concentration of the hydrogen sulfide gas;
and 4, step 4: and putting the gas sensor detection system into a hydrogen sulfide gas chamber to be detected, acquiring a spectrogram detected by the gas chamber, selecting the central wavelength of one section of wave peak, and substituting the central wavelength into a formula c ═ m-p)/n to obtain the concentration of the hydrogen sulfide gas.
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