F-P optical fiber trace gas detection system

Abstract

The utility model discloses an F-P (Fabry-Perot) optical fiber trace gas detection system, which belongs to the technical field of gas detection and comprises a light source module, a gas to-be-detected module and a light detection module, the light source module, the gas to-be-detected module and the light detection module are connected through a light transmission interface, and the light transmission interface is of a cylindrical structure. The light transmission interfaces are movably connected through interface connecting rings, a plurality of sensors are respectively distributed in the light source module, the gas to-be-detected module and the light detection module, and the plurality of sensors are connected with a remote control terminal through a wireless network. According to the utility model, a complex F-P optical fiber trace gas detection system is integrated into three basic modules through a module segmentation and packaging technology, so that the installation and the maintenance are convenient, and the system operation is monitored through a remote control terminal, so that the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to an FP optical fiber trace gas detection system. Background Art

[0002] In gas detection technology, there is a gas detection technology based on FP cavity. FP cavity is the abbreviation of Fabry-Pérot cavity. It is an optical cavity composed of two parallel reflectors. Its working principle is based on the interference phenomenon of light. It is composed of two parallel and highly reflective mirrors (or reflective surfaces). Light is reflected back and forth through these two mirrors to form interference. When the incident light wave is reflected multiple times by the two mirrors in the FP cavity, the multiple interferences formed strengthen the light signals of certain wavelengths, thereby producing a resonance effect. At a specific wavelength, the multiple reflected light waves will form a peak signal, while at other wavelengths they will cancel each other out.

[0003] The trace gas detection technology based on FP cavity has high sensitivity and accuracy, strong anti-interference ability, compact structure and light weight. However, in the existing trace gas detection technology based on FP cavity, such as the FP cavity with all-fiber structure and its construction method and Raman gas detection system in CN116879260A, due to its complex structure, there are problems such as high requirements for production and installation, high maintenance difficulty and high cost of use. Utility Model Content

[0004] The embodiment of the utility model provides an FP optical fiber trace gas detection system to solve the problems of high production and installation requirements, high maintenance difficulty and high use cost of the gas detection technology based on the FP cavity in the prior art.

[0005] On the one hand, an embodiment of the utility model provides an FP optical fiber trace gas detection system, comprising: a light source module, a gas to be tested module and a light detection module, wherein the light source module, the gas to be tested module and the light detection module are connected via a light-through interface, wherein the light-through interface is a cylindrical structure, and wherein the light-through interface is movably connected via an interface connection ring, wherein a plurality of sensors are respectively distributed in the light source module, the gas to be tested module and the light detection module, and wherein the plurality of sensors are connected to a remote control terminal via a wireless network.

[0006] In a possible implementation, a light source and a PDH frequency locking device are provided in the light source module, and an incident single-mode optical fiber is sequentially connected to the light source, the PDH frequency locking device and the optical interface of the light source module.

[0007] In a possible implementation, light-passing interfaces are respectively provided at both ends of the gas-to-be-tested module, an air inlet chamber is provided on the light-passing interface close to the light source module in the gas-to-be-tested module, an air outlet chamber is provided on the light-passing interface close to the light detection module in the gas-to-be-tested module, an FP cavity is provided between the air inlet chamber and the air outlet chamber, the air inlet chamber is also connected to an air inlet valve via an air inlet pipe, and the air outlet chamber is also connected to an air outlet valve via an air outlet pipe.

[0008] In a possible implementation, the optical detection module is sequentially connected to a light-passing interface, an adjustment lens group, a spectrometer, and a photon detector via an output single-mode optical fiber.

[0009] In a possible implementation, the adjustment lens group includes a fiber collimator, a variable aperture, a high-pass filter, and a focusing lens.

[0010] In a possible implementation, the outer ring of the light-transmitting interface is provided with a thread or a buckle, and the two light-transmitting interfaces are threadedly connected or snap-connected via the interface connecting ring.

[0011] In a possible implementation, the air inlet valve and the air outlet valve are both provided with a pressure transmitter, the pressure transmitter is connected to the remote control terminal via a wireless network signal, and the air inlet valve and the air outlet valve are connected to the remote control terminal via a wireless network signal.

[0012] The FP optical fiber trace gas detection system in the utility model has the following advantages:

[0013] (1) The complex FP fiber trace gas detection system is integrated into three basic modules through module segmentation and packaging technology, which is convenient for installation and maintenance.

[0014] (2) Monitor system operation through remote control terminals to reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a FP optical fiber trace gas detection system provided by an embodiment of the utility model;

[0017] Figure 2A schematic diagram of the structure of a light source module of an FP optical fiber trace gas detection system provided by an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of the structure of a gas detection module of an FP optical fiber trace gas detection system provided by an embodiment of the utility model;

[0019] Figure 4 A schematic diagram of the structure of an optical detection module of an FP optical fiber trace gas detection system provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Figure 1 A schematic diagram of the structure of an FP optical fiber trace gas detection system provided by an embodiment of the utility model; an embodiment of the utility model provides an FP optical fiber trace gas detection system, comprising:

[0022] A light source module 1, a gas module to be tested 2 and a light detection module 3, wherein the light source module 1, the gas module to be tested 2 and the light detection module 3 are connected via a light interface 4, wherein the light interface 4 is a cylindrical structure, wherein the light interface 4 is movably connected via an interface connection ring 41, wherein a plurality of sensors are respectively distributed in the light source module 1, the gas module to be tested 2 and the light detection module 3, wherein the plurality of sensors are connected to a remote control terminal 5 via a wireless network, wherein a light source 11 and a PDH frequency locking device 13 are arranged in the light source module 1, wherein an incident single-mode optical fiber 12 is sequentially connected to the light source 11, the PDH frequency locking device 13 and the light interface 4 of the light source module 1, wherein light interfaces 4 are respectively arranged at both ends of the gas module to be tested, wherein an air inlet chamber 21 is arranged on the light interface 4 near the light source module 1 in the gas module to be tested, and wherein a An air outlet chamber 23, an FP cavity 22 is arranged between the air inlet chamber 21 and the air outlet chamber 23, the air inlet chamber 21 is also connected to an air inlet valve 26 through an air inlet pipe 24, and the air outlet chamber 23 is also connected to an air outlet valve 27 through an air outlet pipe 25. The light detection module 3 is sequentially connected with a light-through interface 4, an adjustment lens group 31, a spectrometer 32 and a photon detector 33 through an emitting single-mode optical fiber 34, the adjustment lens group 31 includes a fiber collimator, a variable aperture, a high-pass filter and a focusing lens, the outer ring of the light-through interface 4 is provided with one of a thread or a buckle, and the two light-through interfaces 4 are screwed or snapped together through the interface connecting ring 41, and pressure transmitters are arranged on the air inlet valve 26 and the air outlet valve 27, and the pressure transmitter is connected to the remote control terminal 5 through a wireless network signal, and the air inlet valve 26 and the air outlet valve 27 are connected to the remote control terminal 5 through a wireless network signal.

[0023] Exemplarily, the FP optical fiber trace gas detection system is divided into three parts, namely, a light source module 1, a gas module to be tested 2 and a light detection module 3, through packaging technology. Then, the three parts are interconnected through a certain optical interface 4. Only the optical path passes through the optical interface 4. When detecting gas, the laser is first emitted by the light source 11 of the light source module 1. The laser enters the PDH frequency locking device 13 through the incident single-mode optical fiber 12 to lock the frequency of the light wave to the frequency required for detection. Then, it enters the optical interface 4 through the incident single-mode optical fiber 12. The two optical interfaces 4 between the light source module 1 and the gas module to be tested 2 complete the light passing into the air inlet chamber 21 of the gas module to be tested 2. Before the laser enters, the air inlet chamber 21, the FP cavity 22 and the air outlet chamber 23 are filled with the gas to be tested through the cooperation of the air inlet valve 26 and the air valve 27. The remote control terminal 5 activates the light source 11 after obtaining the gas to be tested through the pressure transmitter on the inlet valve 26 and the gas valve 27. The laser enters the FP cavity 22 through the inlet chamber 21, and then is emitted from the outlet chamber 23. It passes through the two light-passing interfaces 4 to enter the light detection module 3. After the output single-mode optical fiber 34 of the light detection module 3 receives the laser, it passes through the adjustment lens group 31, the spectrometer 32 and the photon detector 33 in sequence to complete the laser transmission. The adjustment lens group 31 includes a fiber collimator, a variable aperture, a high-pass filter and a focusing lens, which are used to adjust and correct the incident laser. The laser then passes through the spectrometer 32 and the photon detector 33 to complete the detection, and the detection data is transmitted to the remote control terminal 5 through the wireless network;

[0024] The remote control terminal 5 also detects the operating status of the light source module 1, the gas test module 2 and the light detection module 3 through the sensors on the light source module 1, the gas test module 2 and the light detection module 3, compares the sensor values ​​through the threshold method, and monitors the operation of the light source module 1, the gas test module 2 and the light detection module 3. When one or more of the light source module 1, the gas test module 2 and the light detection module 3 have abnormal data, the system operation can be quickly restored by directly replacing the module.

[0025] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0026] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A FP optical fiber trace gas detection system, characterized in that: include: A light source module (1), a gas to be tested module (2) and a light detection module (3), wherein the light source module (1), the gas to be tested module (2) and the light detection module (3) are connected via a light-through interface (4), wherein the light-through interface (4) is a cylindrical structure, wherein the light-through interface (4) is movably connected via an interface connection ring (41), wherein a plurality of sensors are respectively distributed in the light source module (1), the gas to be tested module (2) and the light detection module (3), and wherein the plurality of sensors are connected to a remote control terminal (5) via a wireless network.

2. The FP optical fiber trace gas detection system according to claim 1, characterized in that: The light source module (1) is provided with a light source (11) and a PDH frequency locking device (13), and an incident single-mode optical fiber (12) is sequentially connected to the light source (11), the PDH frequency locking device (13) and the optical interface (4) of the light source module (1).

3. The FP optical fiber trace gas detection system according to claim 1, characterized in that: The two ends of the gas to be tested module (2) are respectively provided with light-through interfaces (4); an air inlet chamber (21) is provided on the light-through interface (4) in the gas to be tested module (2) close to the light source module (1); an air outlet chamber (23) is provided on the light-through interface (4) in the gas to be tested module (2) close to the light detection module (3); an FP cavity (22) is provided between the air inlet chamber (21) and the air outlet chamber (23); the air inlet chamber (21) is also connected to an air inlet valve (26) via an air inlet pipe (24); and the air outlet chamber (23) is also connected to an air outlet valve (27) via an air outlet pipe (25).

4. The FP optical fiber trace gas detection system according to claim 1, characterized in that: The light detection module (3) is connected in sequence to a light-through interface (4), an adjustment lens group (31), a spectrometer (32) and a photon detector (33) via an output single-mode optical fiber (34).

5. The FP optical fiber trace gas detection system according to claim 4, characterized in that: The adjustment lens group (31) comprises a fiber optic collimator, a variable diaphragm, a high-pass filter and a focusing lens.

6. The FP optical fiber trace gas detection system according to claim 1, characterized in that: The outer ring of the light-transmitting interface (4) is provided with one of a thread or a buckle, and the two light-transmitting interfaces (4) are threadedly connected or buckled via the interface connecting ring (41).

7. The FP optical fiber trace gas detection system according to claim 3, characterized in that: The air inlet valve (26) and the air outlet valve (27) are both provided with a pressure transmitter, and the pressure transmitter is connected to the remote control terminal (5) via a wireless network signal, and the air inlet valve (26) and the air outlet valve (27) are connected to the remote control terminal (5) via a wireless network signal.

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