CN218546532U

CN218546532U - Fixed laser methane telemetering measurement cloud platform

Info

Publication number: CN218546532U
Application number: CN202221673280.9U
Authority: CN
Inventors: 韦洪昌; 陈士良; 肖震; 蒋卫臣
Original assignee: Changxing China Resources Gas Co ltd
Current assignee: Changxing China Resources Gas Co ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-02-28
Anticipated expiration: 2032-06-30

Abstract

The application discloses fixed laser methane telemetering measurement cloud platform, including cloud platform body, laser methane telemetering measurement device, image acquisition device and host computer, laser methane telemetering measurement device includes optics transmission subassembly, optics receiving component and controller, optics transmission subassembly includes transmitter, collimator, optics receiving component includes spotlight mechanism and detector, the collimator is located the transmitter front side, spotlight mechanism includes spotlight reflector, aspheric surface lens group and the light filter of coaxial setting, spotlight reflector is the polishing aluminium reflector, spotlight reflector moves towards the preceding terminal surface of detector is the concave surface, the detector with the controller electricity is connected. This application chooses polishing aluminium speculum to carry out the focus of reverberation as the spotlight speculum, can improve detection distance to improve the application of methane telemetering measurement cloud platform.

Description

Fixed laser methane telemetering measurement cloud platform

Technical Field

The utility model belongs to the technical field of gaseous detection, especially, relate to a fixed laser methane telemetering measurement cloud platform.

Background

At present, china has hundreds of outdoor natural gas stations with large or small decimal numbers, and the task of safety production is very important, however, inspection personnel in the stations mostly use soapy water to be smeared at natural gas pipeline connecting flanges, instrument interfaces, valves and the like, and whether methane leakage exists or not is judged by observing whether continuous bubbles exist at the positions where the soapy water is smeared. The method needs to invest great manpower for large-area gas pipe networks, and has low efficiency and unreliable accuracy. Some natural gas stations use point type combustible gas detectors, and whether natural gas leaks or not is indirectly judged by detecting the concentration of combustible gas. When natural gas leaks, the natural gas is disorderly distributed under the influence of wind power, the point type combustible gas detector is generally indirectly larger than 10 meters, if the leakage point is under the point type combustible gas detector, the natural gas can be detected, and if the leakage point is not under the point type combustible gas detector, the natural gas cannot be detected. Therefore, in practical use, the point type combustible gas detector has low probability of detecting combustible gas when natural gas leaks.

The existing holder-type laser methane telemeter for methane detection can continuously scan and detect facilities of a station for 24 hours, and the holder-type laser methane telemeter is an area detection means and can scan the facilities within a certain detection distance range. However, the optical structure used by current laser methane telemeters for receiving light is generally focused by a plano-convex lens, and a photodiode is placed at the focusing point of the plano-convex lens. The detection distance is influenced by the light receiving area of the condenser lens, and when the light receiving area is smaller, the detection distance is correspondingly smaller. Due to the self characteristic of the plano-convex lens, the light receiving area is increased by increasing the diameter of the lens, so that the volume and the weight of the lens are large, the volume of the telemeter is influenced, and the telemeter is not convenient to use. The detection distance of the current cloud desktop type laser methane telemeter is about 100 meters, and the detection distance is short, so that the detection of longer distance is difficult. Further, the thickness of the lens itself becomes thinner as the focal length of the plano-convex lens becomes longer, and the thickness of the lens itself becomes thicker as the focal length becomes shorter. Whether the optical path distance is reduced by shortening the focal length or the light receiving area is increased by increasing the diameter, the volume and the weight of the lens are large.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fixed laser methane telemetering measurement cloud platform system to solve above-mentioned technical problem's at least one technical problem.

The utility model discloses the technical scheme who adopts does:

the utility model provides a fixed laser methane telemetering measurement cloud platform system, including cloud platform body, laser methane telemetering measurement device, image acquisition device and host computer, laser methane telemetering measurement device image acquisition device with host computer communication connection, laser methane telemetering measurement device includes optical emission subassembly, optical receiving subassembly and controller, the optical emission subassembly includes transmitter, collimator, the optical receiving subassembly includes spotlight mechanism and detector, the collimator is located the transmitter front side, spotlight mechanism includes spotlight reflector, aspheric surface battery of lens and the light filter of coaxial setting, spotlight reflector is the polishing aluminium reflector, spotlight reflector orientation the preceding terminal surface of detector is the concave surface, the detector with the controller electricity is connected.

In a preferred embodiment of the present invention, the front end surface of the light condensing reflector is provided with a coating film.

As a preferred embodiment of the present invention, the aspheric lens set includes a first lens and a second lens coaxially disposed, the first lens is close to the light gathering reflector one end is a convex surface, and is close to the second lens one end is a plane, the second lens is close to the first lens one end is a convex surface, and is close to the detector one end is a plane.

As a preferred embodiment of the present invention, the optical filter is a narrow band pass optical filter.

As a preferred embodiment of the utility model, the controller includes one-level signal amplification module, second grade signal amplification module, temperature control assembly.

As a preferred embodiment of the utility model, the host computer prestores at least methane concentration threshold value, preset point location information, alarm time.

As an embodiment of the utility model, the cloud platform body includes the base and locates left storehouse, the right storehouse of base, methane telemetering measurement device and image acquisition device are located respectively left side storehouse with right side storehouse, the base passes through horizontal motor and is connected with external equipment, left side storehouse and right storehouse respectively through perpendicular motor with the base is connected.

As a preferred embodiment of the present invention, the image capturing device includes a camera and a light supplement lamp disposed below the camera, the camera and the transmitter are oriented in the same direction, and are disposed on the same horizontal direction.

Since the technical scheme is used, the utility model discloses the beneficial effect who gains does:

1. the application discloses a fixed laser methane telemetering measurement cloud platform system under the condition of not increasing methane telemetering measurement device's weight and volume, through improving focus structure, can further improve telemetering measurement device's detection distance and detection precision for laser methane telemetering measurement cloud platform has better performance. In this application, the laser that the laser instrument sent gets into the environment that awaits measuring after the collimates through the collimater, and the light beam pierces through the methane cloud and gets into laser receiving light path after the reflection of building or arbitrary plane of reflection, focuses on the detector by spotlight mechanism, and the detector obtains the concentration of methane gas in the environment that awaits measuring after converting optical signal into the signal of telecommunication, through the controller processing back. Under the same light receiving area, the polished aluminum reflector is lighter than the traditional plano-convex condensing lens, so that the polished aluminum reflector can easily form a larger light receiving area, and the detection distance can be increased. Moreover, the light condensing mechanism further comprises a secondary lens barrel consisting of the aspheric lens group, so that the interference of stray light on monitoring data can be eliminated to a great extent, and the detection sensitivity and precision are improved. The design of the light path receiving component enables the measuring distance to reach 200m, and is particularly suitable for measuring areas which are difficult to reach by users.

2. In a preferred embodiment of the present invention, the first lens and the second lens cooperate with each other by adding the coaxially disposed aspheric lens group, so that the optical distance can be further shortened. Compared with the mode of only arranging a single light gathering reflector, the optical distance is reduced, and the overall structure volume is reduced.

3. The utility model discloses an in an preferred embodiment, the filter of this application adopts the narrow bandwidth filter, and the narrow bandwidth filter is as a reflective filter, when the detection target leaks gas, when reducing the parasitic light intensity, can also increase the measuring light intensity to increase the detection distance of complete machine equipment. And the narrow bandwidth filter has a narrow central wave band range and strong stray light filtering capability, and can improve the detection precision.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the application and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of a fixed laser methane telemetry pan/tilt provided by an embodiment of the present invention;

fig. 2 is a schematic diagram of an internal structure of a laser methane telemetry device according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an optical path structure provided by the embodiment of the present invention.

Wherein the content of the first and second substances,

1-a holder body; 11-left bin; 12-right bin;

2-laser methane telemetry devices; 21-a transmitter; 22-a collimator; 23-a light gathering reflector; 231-coating; 24-an aspherical lens group; 241-a first lens; 242 — a second lens; 25-an optical filter; 26-a detector; 27-a transmission lens barrel; 271-an emission lens; 28-a receiving barrel; 281-primary receiving lens barrel; 282-a two stage receiving column; 283-a receiving lens;

3-an image acquisition device; 31-a camera; 32-a light supplement lamp;

4-communication optical cable.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", 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, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model provides a fixed laser methane telemetering measurement cloud platform, as shown in fig. 1-3, methane telemetering measurement cloud platform includes cloud platform body 1, laser methane telemetering measurement device 2, image acquisition device 3 and host computer communication connection, laser methane telemetering measurement device 2 includes optical emission subassembly, optical receiving subassembly and controller, optical emission subassembly includes transmitter 21, collimator 22, optical receiving subassembly spotlight mechanism and detector 26. The methane telemetering device is provided with a transmitting lens barrel 27 and a receiving lens barrel 28, and a transmitting lens 271 and a receiving lens 283 are respectively arranged in front of the transmitting lens barrel 27 and the receiving lens barrel 28. The collimator 22 is provided on the front side of the emitter 21 in the laser emission path direction. The receiving lens barrel 28 includes a primary receiving lens barrel 281 and a secondary receiving lens barrel 282, and the secondary receiving lens barrel 282 is disposed inside the primary receiving lens barrel 281 and supported and fixed by a support rod. Along the laser receiving light path direction, the light gathering mechanism comprises a light gathering reflector 23, an aspheric lens group 24 and a light filter 25 which are coaxially arranged, the light gathering reflector 23 is a polished aluminum reflector, and the front end face of the light gathering reflector 23 facing the detector 26 is a concave face. The light gathering reflector 23 is arranged at the rear end of the primary receiving lens barrel 281, the secondary receiving lens barrel 282 is arranged at the front end of the primary receiving lens barrel 281, the aspheric lens group 24, the optical filter and the detector 26 are all arranged on the secondary receiving lens barrel 282, and the detector 26 is electrically connected with the controller.

DPF laser can be selected for use to emitter 21, and InGaAs detector 26 can be selected for use to detector 26, can certainly select other equipment to replace according to actual demand.

The condensing emission mirror is generally a polished aluminum reflection mirror, and the detection distance of the device can reach 200m under the condition of a better reflection surface, so that the service performance is greatly improved. It will be understood by those skilled in the art that the light gathering reflector 23 may also be a reflector of the optical glass substrate polished coating 231, and the coating 231 is typically an aluminum-plated film, but may also be a gold-plated film.

The laser methane telemetering device 2, the image acquisition device 3 and the upper computer can transmit detection signals to the upper computer through the communication optical cable 4, and certainly, wireless modes such as wifi and 2/3/4/5G networks can be adopted for communication connection.

In this application, the laser that the laser instrument sent gets into the environment that awaits measuring after collimator 22 collimates, and the light beam pierces through the methane cloud and after the reflection of building or arbitrary plane of reflection, gets into laser receiving light path, gathers to detector 26 by spotlight mechanism on, detector 26 converts light signal into the signal of telecommunication after, obtains the concentration of methane gas in the environment that awaits measuring after the controller is handled. Under the same light receiving area, the polished aluminum reflector is lighter than the traditional plano-convex condensing lens, so that the polished aluminum reflector can easily form a larger light receiving area, and the detection distance can be increased. Moreover, the light condensing mechanism of the application further comprises a secondary lens barrel consisting of the aspheric lens group 24, so that the interference of stray light on monitoring data can be eliminated to a great extent, and the detection sensitivity and precision are improved.

As shown in fig. 2, in one embodiment, the front end surface of the light gathering reflector 23 may be further provided with a plated film 231. In one aspect, the plating film 231 can be a plating film, such as SiO ₂ The protective layer increases the strength of the polished surface and is suitable for long-term use in industrial settings. On the other hand, the plating film 231 may also be a gold film, which has the advantages of high reflectivity, wide cut-off bandwidth, good neutrality, small polarization effect, etc. in a wide wavelength range.

Specifically, the aspheric lens group 24 includes a first lens 241 and a second lens 242 coaxially disposed, one end of the first lens 241 close to the light gathering reflector 23 is a convex surface, one end close to the second lens 242 is a plane, one end of the second lens 242 close to the first lens 241 is a convex surface, and one end close to the detector 26 is a plane, so as to perform multi-stage light gathering, thereby shortening the optical path distance and reducing the volume of the device.

Specifically, the filter 25 is a narrow band pass filter.

The controller comprises a primary signal amplification module, a secondary signal amplification module and a temperature control assembly. The reflected laser signals are amplified through the primary signal amplification module and the secondary signal amplification module, and the reflection precision can be improved. The controller may also include a program driver circuit.

The upper computer at least prestores a methane concentration threshold value, preset point location information and alarm time. During specific implementation, the methane telemetering cradle head can be set with a preset cruise mode and an area cruise mode, and the preset point information mainly comprises high-risk positions, such as position information of a gas pipeline, a valve and the like. Under the preset cruise mode, the positions of pipelines, valves, pressure regulating boxes and the like which are easy to leak are observed through the camera 31, and a proper preset point is selected to generate a routing inspection path, so that the real-time monitoring of all risk positions in the area within 24 hours can be realized. In the zone cruise mode, the area of any zone is selected through the camera 31, and 24-hour real-time monitoring can be realized on the zone. When the methane concentration is detected to reach a set threshold value in the inspection process, a built-in algorithm program immediately starts a multi-point detection function, multiple times of calibration detection are carried out in the circumferential direction of a leakage point, and if the concentration value exceeding the set threshold value is still detected, an alarm prompt is sent out by the system.

As shown in fig. 1, in one embodiment, the holder body 1 includes a base, and a left chamber 11 and a right chamber 12 provided on the base, the laser methane telemetering device 2 and the image acquisition device 3 are respectively located in the left chamber 11 and the right chamber 12, the base is connected with an external device through a horizontal motor, and the left chamber 11 and the right chamber 12 are respectively connected with the base through a vertical motor. The base can carry out 360 degrees horizontal rotations for external equipment, and left storehouse 11 and right storehouse 12 can carry out 90 degrees every single move rotations for the body. The methane telemetering pan-tilt is generally arranged above an upright post or above a certain building or equipment in a use field, and the methane telemetering pan-tilt can realize the omnibearing real-time monitoring through the use of a horizontal motor and a vertical motor.

The image acquisition device 3 comprises a camera 31 and a fill-in light 32 arranged below the camera 31, and the camera 31 and the emitter 21 face in the same direction and are positioned in the same horizontal direction. The light supplement lamp 32 is arranged below the right bin 12 and is mainly used for illuminating the camera 31 at night or under the condition of low visibility, so that the camera 31 can shoot more clearly.

The utility model can be realized by adopting or using the prior art for reference in places which are not mentioned in the utility model.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A fixed laser methane telemetering cradle head comprises a cradle head body, a laser methane telemetering device, an image acquisition device and an upper computer, wherein the laser methane telemetering device and the image acquisition device are in communication connection with the upper computer,

the laser methane telemetering device comprises an optical transmitting assembly, an optical receiving assembly and a controller, wherein the optical transmitting assembly comprises an emitter and a collimator, the optical receiving assembly comprises a light condensing mechanism and a detector, the collimator is arranged on the front side of the emitter, the light condensing mechanism comprises a light condensing reflector, an aspheric lens group and an optical filter which are coaxially arranged, the light condensing reflector is a polished aluminum reflector, the front end face of the light condensing reflector, facing the detector, is a concave surface, and the detector is electrically connected with the controller.

2. The fixed laser methane telemetry holder of claim 1, wherein the front face of the light gathering reflector is coated.

3. The stationary laser methane telemetry holder of claim 2, wherein the aspheric lens set includes a first lens and a second lens coaxially disposed, the first lens has a convex surface at an end near the condenser reflector and a flat surface at an end near the second lens, the second lens has a convex surface at an end near the first lens and a flat surface at an end near the detector.

4. A stationary laser methane telemetry holder as claimed in claim 2, wherein said filter is a narrow band pass filter.

5. The stationary laser methane telemetry holder of claim 1, wherein the controller comprises a primary signal amplification module, a secondary signal amplification module, and a temperature control assembly.

6. The fixed laser methane telemetering holder according to claim 1, wherein the upper computer is prestored with at least a methane concentration threshold value, preset point location information and alarm time.

7. The fixed laser methane telemetering holder according to claim 1, wherein the holder body comprises a base, and a left chamber and a right chamber provided on the base, the methane telemetering device and the image acquisition device are respectively located on the left chamber and the right chamber, the base is connected with an external device through a horizontal motor, and the left chamber and the right chamber are respectively connected with the base through a vertical motor.

8. The stationary laser methane telemetry holder according to claim 7, wherein the image capture device comprises a camera and a fill light positioned below the camera, the camera and the transmitter are oriented in the same direction and in the same horizontal direction.