CN112798557A - Laser methane remote measuring holder and use method thereof - Google Patents
Laser methane remote measuring holder and use method thereof Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 228
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 230000003321 amplification Effects 0.000 claims description 29
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 29
- 238000004891 communication Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 11
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- 239000003345 natural gas Substances 0.000 description 28
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- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- 238000005504 petroleum refining Methods 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
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- 238000011897 real-time detection Methods 0.000 description 1
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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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
- G01N2021/152—Scraping; Brushing; Moving band
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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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
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Abstract
The application discloses laser methane telemetering measurement cloud platform and application method thereof belongs to and measures technical field, specifically includes: the laser telemetering device comprises a laser emitting assembly, a collimator, a focusing lens, a detector and a controller, wherein laser emitted by the laser emitting assembly sequentially passes through the collimator and the focusing lens to detect methane gas, the laser reflected by the methane gas is converged to the detector, and the detector sends detection information to the controller; the camera and the laser emission assembly are arranged in parallel relatively and are electrically connected with the controller, and the direction of the camera is consistent with the direction of the emission end of the laser emission assembly; the laser telemetering device and the camera are both connected with the motor; one side of the base is fixedly connected with the motor, and the other side of the base is fixed on the external equipment. Through this disclosed scheme, the motor drives laser telemetering device and the camera rotates and detects, and laser telemetering device detects methane gas leakage position, and the camera specifically fixes a position, has improved detection efficiency and precision.
Description
Technical Field
The application relates to the technical field of measurement, in particular to a laser methane telemetering pan-tilt and a using method thereof.
Background
At present, for leakage detection of an open-air natural gas station of a gas transmission pipeline, in the past, a point type combustible gas detector is arranged in engineering, and whether natural gas leakage exists is indirectly judged by detecting the concentration of combustible gas. If through setting up point type combustible gas detector, come indirect judgement through the concentration that detects combustible gas on whether have natural gas to leak, because natural gas leaks the back, the diffusion of natural gas distributes the influence by wind-force: under the windless condition, natural gas is distributed like a willow leaf and mainly diffuses upwards, point type combustible gas detectors generally have the indirect length of more than 10 meters, and if a leakage point is positioned right below the point type combustible gas detector, the natural gas can be detected, and if the leakage point is not positioned right below the point type combustible gas detector, the natural gas cannot be detected. Under the windy condition, the natural gas is distributed in a willow-leaf shape and is mainly diffused upwards along the wind direction in an inclined mode, and when the wind speed is not high and a point type combustible gas detector is arranged in the downwind direction of a leakage point, the natural gas can be detected; if the wind speed is high or the point type combustible gas detector is not in the downwind direction of the leakage point, the detection cannot be carried out. Therefore, in practical use, the point-type combustible gas detector has a low probability of detecting combustible gas when natural gas leaks.
Therefore, a laser methane telemetering cradle head with high detection efficiency and detection precision is needed urgently.
Disclosure of Invention
In view of this, the embodiments of the present disclosure provide a laser methane telemetry pan head and a method for using the same, which at least partially solve the problem in the prior art that the detection efficiency and the detection accuracy are low.
In a first aspect, an embodiment of the present disclosure provides a laser methane telemetry pan/tilt head, including:
the laser telemetering device comprises a laser emitting assembly, a collimator, a focusing lens, a detector and a controller, wherein laser emitted by the laser emitting assembly sequentially passes through the collimator and the focusing lens to detect external methane gas, the laser reflected by the external methane gas is converged to the detector through the focusing lens, and the detector sends detection information to the controller;
the camera is arranged in parallel relative to the laser emission assembly and is electrically connected with the controller, and the direction of the camera is consistent with the direction of the emission end of the laser emission assembly;
the laser telemetering device and the camera are connected with the motor;
the base, the one side of base with motor fixed connection, the another side of base is fixed in on the external equipment.
According to a specific implementation manner of the embodiment of the disclosure, a coating film is arranged on the focusing lens.
According to a specific implementation manner of the embodiment of the present disclosure, the laser emitting component is a DFB laser diode.
According to a specific implementation manner of the embodiment of the disclosure, the laser telemetry device further comprises a signal amplification assembly, the signal amplification assembly comprises a pre-amplification module and a phase-locked amplification module, the input end of the pre-amplification module is electrically connected with the detector, the output end of the pre-amplification module is electrically connected with the input end of the phase-locked amplification module, and the output end of the phase-locked amplification module is electrically connected with the controller.
According to a specific implementation manner of the embodiment of the disclosure, the laser telemetering device further comprises a communication module, and the controller is in communication connection with an external terminal through the communication module.
According to a specific implementation manner of the embodiment of the disclosure, a temperature control module is arranged on the laser emission assembly.
According to a concrete implementation mode of the embodiment of the disclosure, an alarm is arranged at the controller and electrically connected with the controller.
According to a specific implementation manner of the embodiment of the disclosure, the surface of the focusing lens, which is far away from the laser emission component, and the camera are both provided with a wiper.
In a second aspect, embodiments of the present disclosure provide a method for using a laser methane telemetry pan/tilt head, for using a laser methane telemetry pan/tilt head as described in any of the above disclosed embodiments, the method comprising:
providing a laser methane telemetering cradle head, wherein the laser methane telemetering cradle head comprises a laser telemetering device, a camera, a motor and a base;
the motor is fixed on external equipment through the base;
the motor drives the laser telemetering device and the camera to move along a preset path;
the laser telemetering device detects the methane gas concentration on the light path of the laser telemetering device according to a preset frequency;
judging whether the concentration of the methane gas is greater than a threshold value;
if the methane gas concentration is greater than the threshold value, controlling the camera to stop moving within a preset time period, and recording an image of a camera acquisition area;
and if the methane gas concentration is less than or equal to the threshold value, controlling the motor to continuously drive the laser telemetering device and the camera to move along a preset path.
The laser methane telemetering measurement cloud platform scheme in the embodiment of the disclosure includes: the laser telemetering device comprises a laser emitting assembly, a collimator, a focusing lens, a detector and a controller, wherein laser emitted by the laser emitting assembly sequentially passes through the collimator and the focusing lens to detect external methane gas, the laser reflected by the external methane gas is converged to the detector through the focusing lens, and the detector sends detection information to the controller; the camera is arranged in parallel relative to the laser emission assembly and is electrically connected with the controller, and the direction of the camera is consistent with the direction of the emission end of the laser emission assembly; the laser telemetering device and the camera are connected with the motor; the base, the one side of base with motor fixed connection, the another side of base is fixed in on the external equipment.
Through this disclosed scheme, the motor drives laser telemetering device and the camera rotates and detects the scene, and laser telemetering device detects methane gas leakage position, and the camera specifically fixes a position, has improved detection efficiency and precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a laser methane telemetry pan-tilt provided in an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an apparatus in a specific implementation of a laser methane telemetry pan-tilt provided in an embodiment of the present disclosure;
fig. 3 is a schematic partial structural view of a specific implementation of a laser methane telemetry pan/tilt head according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a method for using a laser methane telemetry pan-tilt provided by an embodiment of the present disclosure.
Summary of reference numerals:
a laser methane telemetering cradle head 100;
a laser telemetry device 110;
a camera 120;
a motor 130;
a base 140.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
At present, for leakage detection of an open-air natural gas station of a gas transmission pipeline, in the past, a point type combustible gas detector is arranged in engineering, and whether natural gas leakage exists is indirectly judged by detecting the concentration of combustible gas. If through setting up point type combustible gas detector, come indirect judgement through the concentration that detects combustible gas on whether have natural gas to leak, because natural gas leaks the back, the diffusion of natural gas distributes the influence by wind-force: under the windless condition, natural gas is distributed like a willow leaf and mainly diffuses upwards, point type combustible gas detectors generally have the indirect length of more than 10 meters, and if a leakage point is positioned right below the point type combustible gas detector, the natural gas can be detected, and if the leakage point is not positioned right below the point type combustible gas detector, the natural gas cannot be detected. Under the windy condition, the natural gas is distributed in a willow-leaf shape and is mainly diffused upwards along the wind direction in an inclined mode, and when the wind speed is not high and a point type combustible gas detector is arranged in the downwind direction of a leakage point, the natural gas can be detected; if the wind speed is high or the point type combustible gas detector is not in the downwind direction of the leakage point, the detection cannot be carried out. Therefore, in practical use, the point-type combustible gas detector has a low probability of detecting combustible gas when natural gas leaks. The embodiment of the disclosure provides a laser methane telemetering cradle head which can be applied to a methane leakage detection process in scenes such as a valve station, a petroleum refining plant, an LNG/LPG bottling plant, an L-CNG gas station, a storage tank area and a haishan oil and gas platform.
Referring to fig. 1, a schematic structural diagram of a laser methane telemetry pan head is provided in an embodiment of the present disclosure. As shown in fig. 1, the laser methane telemetry pan/tilt head 100 mainly includes:
the laser telemetering device 110 comprises a laser emitting assembly, a collimator, a focusing lens, a detector and a controller, wherein laser emitted by the laser emitting assembly sequentially passes through the collimator and the focusing lens to detect external methane gas, the laser reflected by the external methane gas is converged to the detector through the focusing lens, and the detector sends detection information to the controller;
the camera 120 is arranged in parallel with the laser emission component relatively and is electrically connected with the controller, and the orientation of the camera 120 is consistent with that of the emission end of the laser emission component;
the motor 130, the laser telemetering device 110 and the camera 120 are connected with the motor 130;
one side of the base 140 is fixedly connected with the motor 130, and the other side of the base 140 is fixed on an external device.
During specific assembly, the collimator and the focusing lens may be sequentially disposed on a light emitting path of the laser emitting assembly, the detector is disposed on a light reflecting path of laser, the camera 120 is disposed in parallel with the laser emitting assembly and electrically connected to the controller, and the direction of the camera 120 is the same as the direction of an emitting end of the laser emitting assembly, and then the detector is electrically connected to the controller. For example, the laser emission component may select an NLK1U5C1TA laser, the detector may select an InGaAs detector, or other devices may be used to replace the detector according to actual requirements, which is not described herein again. And then, the laser telemetering device 110 and the camera 120 are both connected with the motor 130, one surface of the base 140 is fixedly connected with the motor 130, and the other surface of the base 140 is fixed on an external device. Of course, a laser driver may be further provided and connected to the laser emitting assembly, so that a current of a sine wave modulation signal superimposed with a triangular wave signal is output to drive the laser emitting assembly.
When the gas detection device is used, if a using scene is a natural gas station, the laser emitting assembly emits laser, the laser is irradiated to the natural gas station after being collimated by the collimator and converged by the focusing lens, the gas to be detected at a natural gas transportation pipeline in the natural gas station is detected, the laser emitted by the laser emitting assembly is reflected by different objects, the reflected laser is converged onto the detector through the focusing lens, the detector obtains an absorption spectrum of a selected characteristic absorption line of the gas to be detected by utilizing the wavelength tuning characteristic of the laser emitting assembly, so that qualitative or quantitative analysis is carried out on the gas to be detected, and then detection data are sent to the controller. Meanwhile, when the detector detects that the methane gas leaks, the controller may control the camera 120 to collect images in the natural gas station, so as to determine a leakage point.
The laser methane telemetering measurement cloud platform that this embodiment provided carries out real-time detection through adopting the high laser telemetering measurement device of measurement accuracy to gas in the scene to when laser telemetering measurement device detected that there is methane gas leakage, specific leakage point is confirmed to the picture that can the camera was gathered, has improved the detection efficiency and the detection precision of laser methane telemetering measurement cloud platform.
On the basis of the above embodiment, the focusing lens is provided with a coating film.
In specific implementation, considering that an external interference light source enters when the reflected laser is collected, the spectral response range of the detector needs to be adjusted to 850 nm to 1700 nm, the focusing lens may be provided with the coating, the transmittance near 1650 nm is increased through the coating, and an irrelevant optical fiber is reflected, so as to improve the measurement accuracy.
Optionally, the laser emitting component is a DFB laser diode.
In particular, the DFB laser diode may be selected as the laser emitting component in consideration of the optimal transmittance of common and well-developed optical glasses such as BK7 series, etc. at a wavelength of 1653 nm. Of course, other specifications or other laser generating devices can be selected as the laser emitting component.
On the basis of the above embodiment, the laser telemetry device 110 further includes a signal amplification assembly, the signal amplification assembly includes a pre-amplification module and a phase-locked amplification module, an input end of the pre-amplification module is electrically connected to the detector, an output end of the pre-amplification module is electrically connected to an input end of the phase-locked amplification module, and an output end of the phase-locked amplification module is electrically connected to the controller.
During specific implementation, considering that the reflected laser is very weak relative to the emitted laser, the reflected laser signal needs to be preliminarily amplified and output, the pre-amplification module and the phase-locking amplification module can be further arranged to be matched with the reflected laser signal for amplification, so that the detection precision is improved. Specifically, as shown in fig. 2, the detector may be directly welded to the preamplifier module, and a weak current signal of nA magnitude generated by the detector is converted into a voltage signal of mV magnitude after passing through the transimpedance amplifier. The voltage signal passes through a high-pass filter to filter out direct current and low-frequency signals generated by ambient light interference, and then passes through a low-pass filter to filter out high-frequency interference and noise. The high-pass filter and the low-pass filter have certain gains at the same time, and can further amplify the output signal of the trans-impedance amplifier, finally generate a signal with the magnitude of hundreds of mV and transmit the signal to the controller. The preamplification module is used as an independent circuit board and is directly installed at the tail end of an optical path, so that the transmission distance of weak electric signals can be shortest, and interference is prevented from being introduced. The output signal of the pre-amplification module is a low-impedance voltage signal with a certain amplitude, and is transmitted through a cable in the case, so that the performance cannot be influenced by interference.
Optionally, the laser telemetry device 110 further includes a communication module, and the controller is in communication connection with an external terminal through the communication module.
During the concrete implementation, consider that laser methane telemetering measurement cloud platform 100 mounted position generally is in the eminence of natural gas station can be provided with communication module works as the controller receives behind the detection information of detector, can with detection information passes through communication module sends control terminal or high in the clouds database, is convenient for look over and save detection information.
Optionally, a temperature control module is arranged on the laser emission assembly.
In view of the fact that the laser emission assembly generates heat during operation or components are easily damaged when the outside air temperature is too low, the temperature control module may be disposed on the laser emission assembly to stabilize the operating temperature of the laser emission assembly at about the nominal temperature.
Optionally, an alarm is arranged at the controller, and the alarm is electrically connected with the controller.
For example, an audible and visual prompter and the like can be arranged at the controller to serve as the alarm, and when the controller receives that the detection information indicates methane leakage, the alarm can be controlled to give out an audible and visual alarm to prompt workers to process in time, so that the safety is improved.
Optionally, a wiper is disposed on both a surface of the focusing lens away from the laser emitting assembly and the camera 120.
In specific implementation, considering that the working environment of the laser methane telemetry holder 100 is usually outdoors, the wiper may be disposed on both the side of the focusing lens away from the laser emitting assembly and the camera 120, and when there is rain or dust on the focusing lens or the camera 120, the wiper may be timely cleaned to ensure the detection efficiency.
In one embodiment, as shown in FIG. 3, the laser telemetry device 110 may include the illustrated structure, a microcontroller: the device is used for controlling the display screen, receiving key input, controlling the alarm device, laser ranging and Bluetooth transmission, and controlling temperature and outputting wavelength modulation signals.
A temperature control module: for stabilizing the operating temperature of the DFB laser diode near its nominal temperature.
A laser driver: for controlling the output laser wavelength modulation of the DFB laser diode with the output modulation current.
DFB laser diode: the methane gas detection light source has a center wavelength of 1654 nm.
A collimator: the method is used for the long-optical-path collimation design of the laser light source, so that the emitted laser beam has the maximum capability density.
A focusing lens: for focusing the reflected laser beam axially onto the photo detector diode.
Photo-detection diode: the laser detector is used for detecting the reflected laser and converting optical signal input into electrical signal output.
A pre-amplification module: the method is used for amplifying the weak reflection signal of the methane trace gas.
The phase-locked amplifying module: the method is used for weak signal detection, filtering processing, required frequency component extraction and harmonic signal carrying methane concentration information output.
An A/D converter: for converting analog signals into digital signals for processing.
A digital signal processor: and calculating the concentration of the methane gas.
A display screen: for information display.
Pressing a key: the laser controller is used for controlling the on/off of the laser, the on/off of the detection laser and realizing user setting.
An alarm device: and when the methane concentration is detected to exceed the alarm value, performing sound-light alarm.
The laser ranging module: the distance between the device and the probe point is measured in real time.
A Bluetooth module: for wireless transmission.
A power supply module: and the rechargeable lithium battery supplies power for each hardware unit.
In addition, as shown in fig. 4, an embodiment of the present disclosure further provides a method for using a laser methane telemetry pan head, where the method includes:
s401, providing a laser methane telemetering cradle head, wherein the laser methane telemetering cradle head comprises a laser telemetering device, a camera, a motor and a base;
s402, fixing the motor on external equipment through the base;
the motor can be fixed on the base, and the base can be fixed on the external equipment through a connecting piece to realize stable measurement.
S403, the motor drives the laser telemetering device and the camera to move along a preset path;
the data of the preset path can be set in the electronic equipment, and after the preset path is read, the motor can be controlled to drive the laser telemetering device and the camera to move along the preset path. For example, the preset path may be a fixed-point scan, a localized scan, a fixed-speed scan, or the like, that is, the preset path may be a circular scan of several added preset scan points, a circular scan in a specified area, a sector shape, or an inner circular scan in a specified pitch angle range. Of course, the motor can be controlled to adjust the acquisition angles of the laser telemetering device and the camera so as to improve the acquisition efficiency of the laser telemetering device and the camera.
S404, detecting the methane gas concentration on the light path of the laser telemetering device by the laser telemetering device according to a preset frequency;
during specific implementation, the laser telemetering can emit laser signals, the laser signals can transmit reflected light signals after detecting methane gas in a preset area, and the reflected light signals can be correspondingly processed to obtain harmonic signals carrying methane gas concentration information.
S405, judging whether the concentration of the methane gas is greater than a threshold value;
in consideration of the problem of safety, a threshold value can be preset according to different scenes and different safety contents corresponding to the required methane gas, and then the concentration of the methane gas is compared with the threshold value, so that the next operation flow is determined.
If the methane gas concentration is greater than the threshold value, executing step S406, controlling the camera to stop moving within a preset time period, and recording an image of a camera acquisition area;
during specific implementation, if the methane gas concentration is greater than the threshold value, the excessive methane gas concentration in a scene or leakage can be determined, the camera can be controlled to stop moving within a preset time period, and therefore the video collected in the region with the excessive methane gas concentration can be used as an alarm video, and workers can determine the leakage point according to the alarm video. Of course, when the methane gas concentration is detected to be greater than the threshold value, sound and light alarm information can be sent, and the response rate is improved.
And if the methane gas concentration is less than or equal to the threshold value, executing a step S407, and controlling the motor to continuously drive the laser telemetering device and the camera to move along a preset path.
If the methane gas concentration is smaller than or equal to the threshold value, the methane gas concentration in the scene can be determined to meet the safety standard, and the motor can be controlled to continue to drive the laser telemetering device and the camera to move along a preset path without alarming.
In summary, according to the laser methane telemetry holder and the use method thereof in the embodiments of the present disclosure, by setting the laser telemetry device, the camera, the motor, and the base, the laser is emitted through each point in the scene by dynamic collection, the concentration of methane gas on the detection optical path is calculated according to the laser absorption spectrum technology, and the alarm video is recorded when the concentration of methane gas is determined to be too high, so as to improve the detection efficiency and the detection accuracy of the laser methane telemetry holder.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A laser methane telemetering holder is characterized by comprising:
the laser telemetering device comprises a laser emitting assembly, a collimator, a focusing lens, a detector and a controller, wherein laser emitted by the laser emitting assembly sequentially passes through the collimator and the focusing lens to detect external methane gas, the laser reflected by the external methane gas is converged to the detector through the focusing lens, and the detector sends detection information to the controller;
the camera is arranged in parallel relative to the laser emission assembly and is electrically connected with the controller, and the direction of the camera is consistent with the direction of the emission end of the laser emission assembly;
the laser telemetering device and the camera are connected with the motor;
the base, the one side of base with motor fixed connection, the another side of base is fixed in on the external equipment.
2. The laser methane telemetry holder of claim 1, wherein the focusing lens is coated with a coating.
3. The laser methane telemetry holder of claim 1, wherein the laser emitting component is a DFB laser diode.
4. The laser methane telemetry holder of claim 1, wherein the laser telemetry device further comprises a signal amplification assembly, the signal amplification assembly comprises a pre-amplification module and a phase-locked amplification module, an input end of the pre-amplification module is electrically connected with the detector, an output end of the pre-amplification module is electrically connected with an input end of the phase-locked amplification module, and an output end of the phase-locked amplification module is electrically connected with the controller.
5. The laser methane telemetry holder of claim 4, wherein the laser telemetry device further comprises a communication module, and the controller is in communication connection with an external terminal through the communication module.
6. The laser methane telemetry holder of claim 1, wherein a temperature control module is disposed on the laser emitting assembly.
7. The laser methane telemetry holder of claim 1, wherein an alarm is disposed at the controller, the alarm being electrically connected to the controller.
8. The laser methane telemetry holder of claim 1, wherein wipers are disposed on both a face of the focusing lens remote from the laser emitting assembly and the camera head.
9. A method of using a laser methane telemetry pan/tilt head, the method being applied to a laser methane telemetry pan/tilt head as claimed in any one of claims 1 to 8, the method comprising:
providing a laser methane telemetering cradle head, wherein the laser methane telemetering cradle head comprises a laser telemetering device, a camera, a motor and a base;
the motor is fixed on external equipment through the base;
the motor drives the laser telemetering device and the camera to move along a preset path;
the laser telemetering device detects the methane gas concentration on the light path of the laser telemetering device according to a preset frequency;
judging whether the concentration of the methane gas is greater than a threshold value;
if the methane gas concentration is greater than the threshold value, controlling the camera to stop moving within a preset time period, and recording an image of a camera acquisition area;
and if the methane gas concentration is less than or equal to the threshold value, controlling the motor to continuously drive the laser telemetering device and the camera to move along a preset path.
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| CN202011535553.9A CN112798557A (en) | 2020-12-23 | 2020-12-23 | Laser methane remote measuring holder and use method thereof |
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| CN202011535553.9A CN112798557A (en) | 2020-12-23 | 2020-12-23 | Laser methane remote measuring holder and use method thereof |
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