Malodorous gas imaging monitoring device based on laser radar

Abstract

The utility model discloses a malodorous gas imaging monitoring device based on laser radar, which relates to the technical field of malodorous gas monitoring and comprises a base and a shell connected with the middle of the upper end of the base, and a connecting pipe is arranged between the base and the shell. A single photon avalanche diode detector is mounted at the upper end of the base and located at the center of the connecting pipe; an optical window is arranged at the upper end of the outer surface of the shell, and a camera module, a modulator and a middle and far infrared semiconductor laser transmitter are sequentially arranged in the shell from the center to the edge; according to the design, on the basis of the medium and far infrared laser gas absorption principle, a malodorous gas leakage source can be recognized and quantified in a large-range environment, a malodorous gas diffusion image can be generated, and the problem that when a traditional sensor is used for detection, the malodorous gas leakage source cannot be recognized and quantified, and the malodorous gas diffusion image cannot be generated is solved. And the problems are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of stench gas monitoring technology, especially to a stench gas imaging monitoring device based on laser radar. BACKGROUND

[0002] Stench gas mainly comes from industrial production, urban life, livestock and poultry breeding activities, including but not limited to hydrogen sulfide, ammonia, methyl mercaptan, etc. These gases not only affect people's sensory comfort, but also may hide the risk of explosion.

[0003] In order to effectively monitor and control these stench gases, stench gas monitoring technology has emerged, and at present, fixed-point monitoring of stench gas adopts the method of arranging electrochemical sensors at fixed points under septic tanks to monitor parameters such as stench gas concentration. The traditional gas detection method is to place the sensor in the environment of the measured gas. This measurement method is limited by geographical conditions and can only measure the gas content at the current position of the sensor. These parameters can only reflect the stench gas concentration at a certain point, and cannot obtain the information of the stench gas leakage source and the stench gas leakage image in the whole large area.

[0004] To solve the above problems, the utility model provides a stench gas imaging monitoring device based on laser radar. UTILITY MODEL CONTENT

[0005] In view of the deficiencies of the prior art, the utility model provides a stench gas imaging monitoring device based on laser radar, which solves the problems raised in the above background technology.

[0006] To achieve the above purpose, the utility model is realized by the following technical scheme: a stench gas imaging monitoring device based on laser radar, comprising a base and a shell connected to the middle part of the upper end of the base, a connecting pipe is arranged between the base and the shell, and a single photon avalanche diode detector is installed at the positive center of the upper end of the base.

[0007] An optical window is arranged on the outer surface of the upper end of the shell, and a camera module, a modulator and a mid-infrared semiconductor laser emitter are arranged in sequence from the center to the edge inside the shell.

[0008] A support frame is also installed near the center inside the shell, a dielectric film beamsplitter is connected to the top end of the support frame, the dielectric film beamsplitter is arranged obliquely, and the center of the inclined surface of the dielectric film beamsplitter corresponds to the center of the optical window.

[0009] As a further technical scheme of the utility model, the connecting pipe is a hollow structure, a reflection receiving port is arranged at the upper end of the connecting pipe corresponding to the inside center of the shell, the center of the inclined surface of the medium film beamsplitter is located directly above the reflection receiving port, and the center of the inclined surface of the medium film beamsplitter corresponds to the single photon avalanche diode detector.

[0010] As a further technical scheme of the utility model, the optical window is a planar light transmission plate.

[0011] As a further technical scheme of the utility model, the modulator is electrically connected with the mid-far infrared semiconductor laser emitter, and the modulator is used for controlling the frequency and phase of the mid-far infrared semiconductor laser emitter.

[0012] As a further technical scheme of the utility model, the inside of the base is provided with a signal acquisition processing module and a battery module.

[0013] The utility model provides a kind of based on laser radar's foul gas imaging monitoring device, with the following beneficial effects compared with prior art:

[0014] The foul gas imaging monitoring device based on laser radar of the design can superimpose the foul gas concentration condition and spatial distribution condition in the image data of camera module based on mid-far infrared laser gas absorption principle by laser radar detection and identification, realize the display of foul gas concentration and spatial distribution, solve the problem that traditional detection is only to place sensor in the detected gas environment to detect, resulting in that detection is limited by geographical conditions, cannot obtain the information of foul gas leakage source and foul gas leakage image in large range area, the design is not only small in size, portable, but also can carry out detection at any time remotely, especially suitable for large-area real-time monitoring of foul gas in large range of entire environmental area, any section, also suitable for remote monitoring of dangerous area, effectively ensure the safety of personnel. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structural schematic diagram of the utility model;

[0016] Figure 2 It is the sectional view of the utility model;

[0017] Figure 3 It is the sectional front view of the utility model;

[0018] Figure 4 It is the principle schematic diagram of the light information transmission through the plasma membrane beamsplitter in the utility model;

[0019] Figure 5 It is the principle diagram of each component in the utility model;

[0020] Figure 6 The gas mass information acquisition principle diagram in the utility model.

[0021] In the figure: 1, base; 2, shell; 3, optical window; 4, dielectric film beamsplitter; 5, support frame; 6, camera module; 7, modulator; 8, mid-infrared semiconductor laser emitter; 9, single photon avalanche diode detector; 10, signal acquisition processing module; 11, connecting pipe. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] Please refer to Figures 1-4 The utility model provides a kind of based on laser radar's foul gas imaging monitoring device technical scheme: a kind of based on laser radar's foul gas imaging monitoring device, including base 1 and the shell 2 connected in the middle part of the upper end of base 1, connecting pipe 11 is arranged between base 1 and shell 2, the upper end of base 1 is located at the center of connecting pipe 11 and is equipped with single photon avalanche diode detector 9, the inside of base 1 is provided with signal acquisition processing module 10 and battery module, wherein, single photon avalanche diode detector 9 is a kind of high-sensitivity photoelectric detector, the light information that the laser of specific wavelength is scattered back after passing through measured gas is passed through single photon avalanche diode detector 9, converts optical signal into electrical signal, to be transmitted to signal acquisition processing module 10, to realize the detection of measured gas concentration;

[0024] The outer surface of shell 2 is provided with optical window 3 at the upper end, and the optical window 3 is a plane light-transmitting plate, which is designed to provide high transmittance for light of a specified wavelength while minimizing light reflection and absorption loss. The main function of the optical window 3 is to protect the optical system and electronic components inside the shell 2 from external interference.

[0025] The inside of shell 2 is sequentially arranged with camera module 6, modulator 7 and mid-infrared semiconductor laser emitter 8 at the center to the edge, wherein, camera module 6 mainly receives light information, and performs white light optical imaging on the entire field of view environment to generate real-time images. It should be noted that the visible light image information received by the camera module 6 is essentially the optical information of the visible light wavelength reflected and scattered by the corresponding field of view angle of the camera module 6. The receiving device is the camera module 6, and the main source of visible light emission and scattering is the external ambient light.

[0026] The modulator 7 and the mid-far infrared semiconductor laser emitter 8 are electrically connected, the modulator 7 is used for controlling the frequency and phase of the mid-far infrared semiconductor laser emitter 8, and the mid-far infrared semiconductor laser emitter 8 mainly functions to generate laser of a specific wavelength;

[0027] The support frame 5 is further arranged at the inner part of the shell 2 near the center, the top end of the support frame 5 is connected with the dielectric film beamsplitter 4, the dielectric film beamsplitter 4 and the support frame 5 can be rotatably fixed, and the included angle between the dielectric film beamsplitter 4 and the support frame 5 can be adjusted and fixed, so as to adjust the inclination angle of the dielectric film beamsplitter 4, the dielectric film beamsplitter 4 is an optical beamsplitter based on dielectric film, which uses the characteristics of dielectric film to split a beam of light into transmitted light and reflected light, as shown in the figure, after the optical information enters through the optical window 3, 50% of the optical information is transmitted into the camera module 6 after passing through the dielectric film beamsplitter 4, and 50% of the optical information is reflected into the connecting pipe 11 of the single-photon avalanche diode detector 9. Figure 4

[0028] The dielectric film beamsplitter 4 is arranged in an inclined manner, the center of the inclined surface of the dielectric film beamsplitter 4 corresponds to the center of the optical window 3, the connecting pipe 11 is of a hollow structure, a reflection receiving port is arranged at the inner part of the shell 2 corresponding to the upper end of the connecting pipe 11, the center of the inclined surface of the dielectric film beamsplitter 4 is located directly above the reflection receiving port, and the center of the inclined surface of the dielectric film beamsplitter 4 corresponds to the single-photon avalanche diode detector 9, as shown in the figure, because the air mass gas information is the laser information reflected and scattered by the laser of the corresponding field angle received by the single-photon avalanche diode detector 9, the receiving device is the single-photon avalanche diode detector 9, but the emission and scattering source is different from visible light, the visible light is generated by the external environment, and the emission and scattering source is the special laser generated by the mid-far infrared semiconductor laser emitter 8 of the equipment itself, which leads to the need to place the camera module 6, the mid-far infrared semiconductor laser emitter 8 and the single-photon avalanche diode detector 9 at the same angle in order to keep the field angle of the visible light image information and the air mass information consistent, but the volume of the three components together is large, and they cannot be placed at the same angle, therefore, the single-photon avalanche diode detector 9 is independently placed, the camera module 6 and the mid-far infrared semiconductor laser emitter 8 are arranged, and then the inclination angle of the dielectric film beamsplitter 4 and the angle of the single-photon avalanche diode detector 9 are placed at the same angle, so that the two components keep the field angle consistent, as shown in the figure, part of the light of the field angle enters the camera module 6 through the dielectric film beamsplitter 4 to obtain the visible light image, and part of the light of the field angle enters the single-photon avalanche diode detector 9 through reflection to obtain the air mass gas concentration image information. Figure 6 Figure 6

[0029] ​​​The working principle of the utility model is: in practical application, the middle and far infrared semiconductor laser emitter 8 of the laser radar continuously tunes wavelength on the absorption spectrum of the odor gas molecule, the laser can be amplitude modulated through the modulator 7, and is emitted to the object far away by the middle and far infrared semiconductor laser emitter 8, passes through any gas plume between the scattering object and the laser radar, returns to the laser radar from the scattered light far away, and is detected by the single photon avalanche diode detector 9;

[0030] The distance of the laser radar to the gas plume is calculated through the time difference of the laser radar signal emission and reception, that is, D (the distance of the laser radar to the gas plume) = S (light speed) × T (the time difference of the laser radar signal emission and reception), and the absorption spectrum realized by the laser tuning is used, a group of rotatable prisms (that is, medium film spectroscope 4) are installed in front of the middle and far infrared semiconductor laser emitter 8, and the scanning of the laser beam in a circular two-dimensional field of view is realized through the rotation of the prisms.

[0031] The gas concentration path length (ppm*m) is measured along each pointing vector of the laser, the laser radar point cloud is provided in this way, and the laser radar image (laser radar intensity and range) and the gas density image of any gas plume in this circular two-dimensional field of view can be generated from the laser radar point cloud.

[0032] Moreover, the laser scanning of the laser radar can establish a laser radar point cloud of the object and the gas, display the exact plume position, shape and size, different measurement values at different positions can be represented through different colors by adding the individual gas density measurement values at each point, and then the physical size of the plume seen by the laser radar is determined using the laser radar distance measurement value, and different gases can realize the display of the concentration and spatial distribution of the odor gas.

[0033] The above only is the preferred implementation manner of the utility model, it should be pointed out that, for ordinary skilled person in the art, without departing from the principle of the utility model, still can make several improvements and refinements, these improvements and refinements also should be regarded as the protection range of the utility model.The structure, device and operation method not specifically described and explained in the utility model, such as no special description and limitation, are implemented according to the conventional means in the art.

Claims

1. A lidar-based odor gas imaging monitoring device, comprising a base (1) and a housing (2) connected to the upper middle part of the base (1), characterized in that, A connecting pipe (11) is provided between the base (1) and the housing (2), and a single-photon avalanche diode detector (9) is installed at the center of the connecting pipe (11) at the upper end of the base (1). An optical window (3) is provided on the upper end of the outer surface of the housing (2), and a camera module (6), a modulator (7) and a mid- and far-infrared semiconductor laser emitter (8) are arranged sequentially from the center to the edge inside the housing (2). A support frame (5) is installed near the center inside the housing (2). A dielectric film beam splitter (4) is connected to the top of the support frame (5). The dielectric film beam splitter (4) is tilted, and the center of the tilted surface of the dielectric film beam splitter (4) corresponds to the center of the optical window (3).

2. The odor gas imaging monitoring device based on lidar according to claim 1, characterized in that, The connecting tube (11) is a hollow structure. The internal center of the housing (2) is provided with a reflection receiving port at the upper port of the connecting tube (11). The center of the inclined surface of the dielectric film beam splitter (4) is located directly above the reflection receiving port. The center of the inclined surface of the dielectric film beam splitter (4) corresponds to the single-photon avalanche diode detector (9).

3. The odor gas imaging monitoring device based on lidar according to claim 1, characterized in that, The optical window (3) is a planar light-transmitting plate.

4. The odor gas imaging monitoring device based on lidar according to claim 1, characterized in that, The modulator (7) is electrically connected to the mid-infrared semiconductor laser emitter (8), and the modulator (7) is used to control the frequency and phase of the mid-infrared semiconductor laser emitter (8).

5. The odor gas imaging monitoring device based on lidar according to claim 1, characterized in that, The base (1) is equipped with a signal acquisition and processing module (10) and a battery module.

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