CN216646249U

CN216646249U - Optical fiber gas sensor based on CuO coated composite MXene material

Info

Publication number: CN216646249U
Application number: CN202123131558.8U
Authority: CN
Inventors: 张寒梅; 刘欣; 沈涛
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-05-31
Anticipated expiration: 2031-12-14

Abstract

The utility model discloses an optical fiber gas sensor based on a CuO coated composite MXene material, which is characterized in that: the device comprises an ASE light source (1), a circulator (2), a sensing system (3), a spectrometer (4), a demodulation module (5) and a PC (personal computer) end (6); the sensor is formed by compounding a multimode fiber and a single-mode fiber, an air cavity is formed in the single-mode fiber, the fiber is tapered under a heating state, the axial length of the air cavity is increased, the cavity wall is thinned, and the lateral surface of the air cavity is coated with a CuO composite MXene material sensitive to gaseous toluene (C7H 8). During application, the gas storage device is opened, the sensing unit is placed in the air with the concentration of gaseous toluene (C7H8) to be detected, a light beam emitted from the ASE light source is transmitted to the circulator, the output light beam of the circulator is transmitted to the sensing unit in the sensing system, the spectrometer is used for observing the drift amount of the central wavelength of the resonance trough in the transmission spectrum of the sensing unit, and the demodulation module is used for demodulating the spectrometer and transmitting the demodulation signal to the PC terminal for data processing.

Description

Optical fiber gas sensor based on CuO coated composite MXene material

Technical Field

The utility model belongs to the technical field of optical fiber sensing, and particularly relates to an optical fiber gas sensor based on a CuO composite MXene material.

Background

With the advancement of technology, there has been a continuous emergence of various harmful VOCs in which gaseous toluene (C7H8), which is toxic to humans and the environment, is produced in paints, diluents, adhesives, cleaners, leather tanning processes. Therefore, early detection of p-toluene gas is important to reduce its exposure and to monitor its concentration in indoor and outdoor environments for health hazards. Compared with the traditional electronic sensor, the optical fiber sensor has the advantages of high sensitivity and precision, good insulation, high signal-to-noise ratio, compatibility with a digital communication system, no electromagnetic interference, small volume and higher flexibility, and nowadays, a plurality of optical fiber sensors capable of measuring temperature, magnetic field, humidity and the like are developed. The utility model has the advantages of low manufacturing cost, compact structure, high sensitivity and the like, and can be applied to high-precision measurement of the concentration of gaseous toluene (C7H8) in gas.

The optical fiber gas sensor based on the CuO composite MXene material is characterized in that a sensing unit is of a composite structure formed by cascading a multimode optical fiber and a single-mode optical fiber, an air cavity is formed in the single-mode optical fiber, the optical fiber is tapered in a heating state, the axial length of the air cavity is increased, the wall of the air cavity is thinned, the CuO composite MXene material sensitive to gaseous toluene (C7H8) is coated on the side surface of the sensing unit, the multimode optical fiber and the single-mode optical fiber are welded and combined on a welding surface, when the optical fiber gas sensor is applied, the sensing unit is placed in air with the concentration of the gaseous toluene (C7H8) to be detected, an ASE light source emits light beams to be transmitted to a circulator, the light beams output by the circulator are transmitted to the sensing unit in a sensing system, a spectrometer is used for observing the drift amount of the central wavelength of a resonance trough in a transmission spectrum, and the spectrometer is transmitted to a PC end through a demodulation module for data processing.

Disclosure of Invention

In order to solve the defects of the traditional technology, the utility model provides the optical fiber gas sensor based on the CuO composite MXene material, which has the advantages of low manufacturing cost, compact structure, high sensitivity and the like, and can be applied to high-precision measurement of the concentration of gaseous toluene (C7H8) in gas.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the technical scheme is as follows:

1. the optical fiber gas sensor based on the CuO coated composite MXene material is characterized by comprising an ASE light source (1), a circulator (2), a sensing system (3), a spectrometer (4), a demodulation module (5) and a PC (personal computer) end (6);

the sensing system (3) comprises a gas sensing box (3-1), a gas storage device (3-2), a gas transmission channel (3-3), a bracket (3-4) and a sensing unit (3-5), wherein:

a gas storage device (3-2) is arranged on the right side of the gas sensing box (3-1), a sensing unit (3-5) is arranged on a support (3-4) in the gas sensing box (3-1), and the gas sensing box (3-1) is connected with the gas storage device (3-2) through a gas transmission channel (3-3);

the sensing unit (3-5) is formed by fusion-splicing a multimode optical fiber (3-5-1) and a single-mode optical fiber (3-5-2) at a fusion-splicing surface (3-5-5), an air cavity (3-5-4) is formed in the single-mode optical fiber (3-5-2), the optical fiber is tapered under a heating state, so that the axial length of the air cavity (3-5-4) is increased and the cavity wall is thinned, a CuO composite MXene material (3-5-3) sensitive to gaseous toluene (C7H8) is coated on the side surface of the air cavity, when the sensing unit is applied, the sensing unit (3-5) is placed in air with the concentration of the gaseous toluene (C7H8) to be measured, an ASE light source (1) emits light beams to be transmitted to a circulator (2), and the circulator (2) outputs the light beams to be transmitted to the sensing unit (3-5) in the sensing system (3), the spectrometer (4) is used for observing the drift amount of the center wavelength of the resonant wave trough in the transmission spectrum of the spectrometer, and the demodulation module (5) is used for demodulating the spectrometer (4) and transmitting the demodulated signal to the PC (6) for data processing.

The light source is an ASE light source (1) having a center wavelength of 1550nm for generating an optical signal.

When the sensing system (3) measures the concentration of the gaseous toluene (C7H8), the gas storage device (3-2) is opened, and the gaseous toluene (C7H8) gas is transmitted into the gas sensing box (3-1) through the gas transmission channel (3-3), so that the gas measurement is realized.

And a metal pipe is sleeved outside a welding area between the rear end of the multimode optical fiber (3-5-1) and the front end of the single-mode optical fiber (3-5-2), and the metal pipe is connected with the welding area through PDMS.

The side of the length of biconical single mode fiber containing the air cavity was coated with gaseous toluene (C7H8) gas sensitive material with a thickness of 5-7 μm.

The utility model comprises the following steps: an optical fiber gas sensor based on a CuO composite MXene material is coated.

Compared with the prior art, the utility model has the beneficial effects that:

1. the sensor adopts the fusion welding combination of the multimode optical fiber and the single mode optical fiber, and the outside of the fusion welding area is sleeved with the metal pipe.

2. The air cavity wall becomes extremely thin after tapering, so that the interaction between an evanescent field and an external substance when light is transmitted in the cavity wall can be enhanced, the sensitivity and the response speed of the optical fiber are obviously improved, and the size of the optical fiber sensor is more compact.

3. The utility model realizes demodulation and can output the result to the PC end, thereby realizing real-time monitoring and measurement.

Drawings

Fig. 1 is a system configuration diagram of an optical fiber gas sensor based on a coated CuO composite MXene material.

Fig. 2 is a structural diagram of a sensing unit of an optical fiber gas sensor based on a coated CuO composite MXene material.

Fig. 3 is a diagram of a sensing system of an optical fiber gas sensor based on a CuO composite MXene material.

Detailed Description

The following embodiment will explain the concrete implementation of the optical fiber gas sensor based on the coated CuO composite MXene material according to the present invention with reference to the attached drawings.

As shown in fig. 1, for the system structure diagram of the optical fiber gas sensor based on the coating of the CuO composite MXene material provided by the present invention, the gas storage device (3-2) is opened, and the sensing unit (3-5) is placed in the air with the concentration of the gaseous toluene (C7H8) to be measured, the light beam emitted from the ASE light source (1) is transmitted to the circulator (2), the light beam output by the circulator (2) is transmitted to the sensing unit (3-5) in the sensing system (3), the shift amount of the resonant central wavelength in the transmission spectrum thereof is observed by using the spectrometer (4), and the demodulation in the spectrometer (4) is transmitted to the PC terminal (6) through the demodulation module (5) for data processing.

As shown in FIG. 2, for the structure diagram of the sensing unit of the optical fiber gas sensor based on the CuO composite MXene material coating, the sensing unit (3-5) is formed by fusion-bonding the multimode optical fiber (3-5-1) and the single-mode optical fiber (3-5-2) at the fusion-bonding surface (3-5-5), the single-mode optical fiber (3-5-2) is internally provided with an air cavity (3-5-4), the optical fiber is tapered under a heating state, so that the axial length of the air cavity (3-5-4) is increased, the cavity wall is thinned, the side surface of the optical fiber is coated with the CuO composite MXene material (3-5-3) sensitive to gaseous toluene (C7H8), the concentration change of the gaseous toluene (C7H8) is monitored, and when the concentration of the gaseous toluene (C7H8) is changed, the CuO composite MXene material (3-5-3) is changed, the light beam is transmitted to the single-mode fiber (3-5-2) to influence the transmission optical path of one interference arm of the Mach-Zehnder, so that the interference spectrum changes, and the concentration of the gaseous toluene (C7H8) is measured by monitoring the change of the interference spectrum.

As shown in fig. 3, a sensing system diagram of the optical fiber gas sensor based on the coated CuO composite MXene material is provided for the present invention, wherein the sensing system (3) includes a gas sensing box (3-1), a gas storage device (3-2), a gas transmission channel (3-3), a bracket (3-4), and a sensing unit (3-5), wherein:

the gas storage device (3-2) is arranged on the right side of the gas sensing box (3-1), the sensing unit (3-5) is arranged on a support (3-4) in the gas sensing box (3-1), the gas sensing box (3-1) is connected with the gas storage device (3-2) through the gas transmission channel (3-3), and the concentration change of gaseous toluene (C7H8) in the gas sensing box (3-1) is adjusted by opening the gas storage device (3-2), so that the concentration measurement of the gaseous toluene (C7H8) is realized, wherein the height of the sensing unit (3-5) is kept consistent with that of the gas transmission channel (3-3).

Claims

1. The optical fiber gas sensor based on the CuO coated composite MXene material is characterized in that: the device comprises an ASE light source (1), a circulator (2), a sensing system (3), a spectrometer (4), a demodulation module (5) and a PC (personal computer) end (6);

the sensing unit (3-5) is formed by fusion-splicing a multimode optical fiber (3-5-1) and a single-mode optical fiber (3-5-2) at a fusion-splicing surface (3-5-5), an air cavity (3-5-4) is formed in the single-mode optical fiber (3-5-2), the optical fiber is tapered under a heating state, so that the axial length of the air cavity (3-5-4) is increased and the cavity wall is thinned, the side surface of the air cavity is coated with CuO composite MXene material (3-5-3) sensitive to gaseous toluene (C7H8), when the sensing unit is applied, a gas storage device (3-2) is opened, the sensing unit (3-5) is placed in air with the concentration of the gaseous toluene (C7H8) to be tested, a light beam is emitted from an ASE light source (1) and transmitted to a circulator (2), and the output light beam of the circulator (2) is transmitted to the sensing unit (3-5) in a sensing system (3), the shift amount of the central wavelength of the resonant wave trough in the transmission spectrum of the spectrometer (4) is observed by using the spectrometer (4), and the spectrometer (4) is demodulated and transmitted to a PC (personal computer) end (6) through a demodulation module (5) to perform data processing.

2. The optical fiber gas sensor based on coated CuO composite MXene material of claim 1, characterized in that:

3. The optical fiber gas sensor based on coated CuO composite MXene material of claim 1, characterized in that:

4. The optical fiber gas sensor based on coated CuO composite MXene material of claim 1, characterized in that:

5. The optical fiber gas sensor based on coated CuO composite MXene material of claim 1, characterized in that: