CN105444970A - Gas detection system - Google Patents
Gas detection system Download PDFInfo
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- CN105444970A CN105444970A CN201510771272.6A CN201510771272A CN105444970A CN 105444970 A CN105444970 A CN 105444970A CN 201510771272 A CN201510771272 A CN 201510771272A CN 105444970 A CN105444970 A CN 105444970A
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- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 238000012545 processing Methods 0.000 claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims abstract description 48
- 230000003595 spectral effect Effects 0.000 claims abstract description 41
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims description 32
- 230000003287 optical effect Effects 0.000 claims description 22
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 239000013307 optical fiber Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 59
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 22
- 238000004458 analytical method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
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Abstract
The invention provides a gas detection system comprising a ground system and a flight system. The ground system comprises a spectral data processing device. The flight system comprises a flight device, and a laser emission device and a light path conversion device which are arranged on the flight device. The laser emission device is used for emitting laser to a detected area. The light path conversion device is used for receiving the laser reflected back by the detected area and sending the received reflected laser to the spectral data processing device. The spectral data processing device is used for receiving the reflected laser and determining the gas composition and/or content of the detected area according to the reflected laser. According to the invention, the heavier spectral data processing device is arranged on the ground, and the light path conversion device and the laser emission device which are lighter are carried by the flight device to the air, so that the overall weight of the flight module is reduced, and the lifetime is increased.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a gas detection system.
Background
With the development of economy, the application of gas in industry and civilian use is more and more extensive, and gas is as an energy, and the leakage of gas pipeline not only can cause economic loss, but also can cause bodily injury, therefore, gas detection is especially important as precautionary measure. At present, a common detection method is through a gas detector, but the detection efficiency and the speed of the gas detector are low, so that the detection requirements of practical application are difficult to meet, and particularly, the detection is difficult for pipelines placed in the air, such as overhead pipelines, high-rise building gas pipelines and the like in the field of chemical engineering, in some special application places.
Disclosure of Invention
In view of this, the present invention provides a gas detection system, which aims to solve the problem in the prior art that the pipeline leakage in the air is difficult to detect.
In one aspect, the present invention provides a gas detection system, comprising: ground systems and flight systems; wherein the surface system comprises a spectral data processing device; the flight system comprises a flight device, a laser emitting device and a light path conversion device, wherein the laser emitting device and the light path conversion device are arranged on the flight device; the laser emitting device is used for emitting laser to the detected area; the light path conversion device is used for receiving the laser reflected by the detected area and diverting the received reflected laser to a spectral data processing device; the spectral data processing device is used for receiving the reflected laser, extracting parameters of the reflected laser, and determining gas components and/or content of the detected area according to the parameters of the reflected laser and prestored parameters of the laser emitted by the laser emitting device.
Further, in the gas detection system, the laser emitting device is a single-wavelength laser emitting device.
Further, in the above gas detection system, the spectral data processing device includes: the device comprises a laser receiving device, a spectrum conversion device and a processing device; the laser receiving device is used for receiving the reflected laser light turned by the light path conversion device and transmitting the received reflected laser light to the spectrum conversion device; the spectrum conversion device is used for receiving the reflected laser and converting the reflected laser into a spectrum; and the processing device is connected with the spectrum conversion device and is used for receiving the spectrum and comparing the spectrum with a prestored spectrum database so as to determine other detected components and/or contents.
Further, in the above gas detection system, the laser light reflected by the detected region and received by the optical path conversion device is transmitted to the spectral data processing device through air or an optical fiber.
Further, the gas detection system further includes: the system comprises a ground vehicle-mounted device and a spectral data processing device arranged on the ground vehicle-mounted device.
Further, the gas detection system further includes: and the first positioning system is used for determining that the flying device is arranged in a preset range above the ground system so as to enable the spectral data processing device to receive the laser reflected back by the turning of the light path conversion device.
Further, in the above gas detection system, the first positioning system includes: the laser is arranged on the ground system and used for emitting laser to the flying device; the light sensing plate is arranged at the bottom of the flying device and used for receiving the laser emitted by the laser and emitting a light sensing electric signal; and the control device is connected with the photosensitive plate and used for receiving the photosensitive electric signal and determining whether the flying device is positioned in a preset range above the ground system or not according to the received photosensitive electric signal.
Further, in the above gas detection system, the first positioning system includes: a first GPS system and a second GPS system; the first GPS system is arranged on the ground system and used for positioning the position of the ground system; the second GPS system is arranged on the flight system and used for positioning the position of the flight system; and the control device is connected with the first GPS system and the second GPS system and used for receiving the positions of the ground system and the flight system and controlling the flight system so that the flight system is arranged in a preset range above the ground system.
Further, the gas detection system further includes: and the second positioning system is arranged on the flying device and used for ensuring that the distance between the laser emitting device and the detected area is within a preset distance range.
Further, in the gas detection system, the second positioning system is further configured to send an abnormal detection alarm signal when the reflection distance is smaller than a preset distance; the reflection distance is the distance between the laser emitting device and a laser reflection point in the detected area.
The gas detection system provided by the invention detects the gas in the detected area through the laser emitted by the laser emitting device, and is divided into a ground system and a flight system, wherein the flight system carries the laser emitting device and the light path conversion device to the air, so that the aerial pipeline can be directly detected. In addition, when the flight device has a problem, only the optical conversion device and the laser emitting device need to be replaced, and the cost of high-altitude gas detection is effectively reduced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a block diagram of a gas detection system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a spectral data processing apparatus in a gas detection system according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a usage status of the gas detection system according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, fig. 1 is a block diagram of a gas detection system according to an embodiment of the present invention. As shown, the detection system comprises: a ground system 1 and a flight system 2. Wherein, the ground system 1 is set on the ground, the flying system 2 can fly in the air, and the detection is completed by the cooperation of the ground system 1 and the flying system 2.
The flying system 2 may include a flying device 21, an optical path conversion device 22, and a laser emitting device 23. The laser emitting device 23 is used for directly emitting laser to the detected area, and in particular, the laser emitting device 23 may be a laser. The wavelength emitted by the laser emitting device 23 can be selected according to the gas to be detected, for example, the operating wavelength of laser is 1653.7nm when the gas to be detected is methane, because methane gas can absorb the laser with the wavelength. The flying device 21 may be an aircraft, such as a helicopter, drone, or the like. The optical path conversion device 22 is installed on the flying device 21, and the optical path conversion device 22 is used for receiving the laser reflected by the detected area and converting the propagation direction of the laser reflected by the detected area so that the reflected laser is incident to the spectral data processing device 11 in the ground system 1. In practical implementation, the laser light reflected by the detected region received by the optical path conversion device 22 can also be transmitted to the spectral data processing device 12 through air or an optical fiber. In particular, the optical path conversion device 22 may be composed of optical devices such as a concave mirror, a lens, and a prism, and the optical conversion device 22 may be implemented in various embodiments as long as the purpose of turning is achieved.
The ground system 1 comprises a spectral data processing device 11. The spectral data processing device 11 in the ground system 1 is configured to receive the laser light reflected by the detected area and steered by the light path conversion device 22, extract parameters of the reflected laser light, and determine the gas composition and/or content of the detected area according to the parameters of the reflected laser light and the prestored parameters of the laser light emitted by the laser emitting device. The spectral data processing device 12 can derive the composition and content of each gas according to the wavelength and intensity loss of the received reflected laser light. The composition of the detected gas can be determined by analyzing wavelength information of the laser spectrum, the content of each component in the detected gas can be obtained by information such as intensity loss of the reflected laser, and the analysis method can be a three-level identification method, an integral analysis method and other analysis methods known to those skilled in the art. It should be noted that the spectral data processing device 11 and the specific analysis method are well known to those skilled in the art, and therefore are not described in detail.
The working principle of the embodiment is as follows: for a particular gas, laser light of a particular wavelength may be absorbed, and embodiments of the present invention utilize this property of the gas to detect the gas. For example, methane may absorb laser light with a wavelength of 1653.7nm, when methane is detected, the laser emitting device 23 is adjusted to make the laser emitting device 23 emit laser light with a wavelength of 1653.7nm, and when the laser light with the wavelength is emitted to the detected area, if methane gas exists in the detected area, the methane gas will absorb the laser light with the wavelength wholly or partially, and the laser light reflected back by the methane gas will not have the laser light with the wavelength any more or will be weakened; if there is no methane gas in the detected region, the laser light of that wavelength will not be absorbed. It can be seen that, based on this characteristic, the gas composition in the detected region can be determined by analyzing the spectrum of the laser light reflected back from the detected region. In addition, methane also causes loss of laser intensity when absorbing gas, and different gases have different capabilities of causing loss to laser, so that the content of the gas can be determined by analyzing the loss of laser intensity.
The working process of the embodiment is as follows: the flying device 21 is started, the flying device 21 carries the laser emitting device 23 and the optical path switching device 22 to rise to the vicinity of the detected area, then the flying device 21 adjusts the position, and further adjusts the position of the optical path switching device 22, so that the spectrum data processing device 12 can receive the reflected laser light after the optical path switching device 22 turns, after the position of the flying device 21 is adjusted, the detection is started, at this time, the laser light emitted by the laser emitting device 11 directly emits to the detected area, the laser light is reflected by the gas to be detected, the reflected laser light is turned through the optical path switching device 22, the laser light after turning is transmitted in the air or optical fiber medium and transmitted to the spectrum data processing device 12 in the ground system, and the spectrum data processing device 12 analyzes the spectrum of the laser light to obtain the component and/or the content of the gas to be detected.
The gas detection system provided in this embodiment detects the gas in the detected area through the laser emitted by the laser emitting device, and the gas detection system is divided into two parts, namely a ground system 1 and a flight system 2, and the flight system 2 carries the laser emitting device 23 and the light path conversion device 22 to the air, so that the aerial pipeline can be directly detected. In addition, when the flight device 12 has a problem, only the optical conversion device 22 and the laser emitting device 21 need to be replaced, and the cost of high-altitude gas detection is effectively reduced.
In the above embodiment, the laser emitting device may be a single-wavelength laser emitting device, that is, the laser emitting device can only emit laser light with one wavelength. Because the laser emitting device can only emit laser with one wavelength, only one gas can be detected, but the single-wavelength laser emitting device is light in weight, can be carried into the air, can directly irradiate the emitted laser on a detected area, and has a good detection effect. It can be seen that in the present embodiment, the light-weight spectral data processing device 12 is disposed on the ground, and only the light-weight optical path conversion device 22 and the laser emitting device 23 are carried into the air by the flying device 21, and the method is used to transfer the heavy-core equipment to the ground, so as to reduce the weight carried by the flying device 21, increase the cruising ability of the flying device 21, and complete gas detection in a large area at one time. In addition, generally speaking, the higher the detection accuracy, the heavier the weight of the spectral data processing device 11, and since the spectral data processing device 11 in this embodiment is placed on the ground, the spectral data processing device with higher accuracy can be selected, thereby improving the detection accuracy of the gas.
Referring to fig. 2, in the above embodiment, the spectral data processing device 11 includes a laser receiving device 111, a spectral conversion device 112, and a processing device 113. The laser receiving device 111 is used for receiving the reflected laser light turned by the optical path conversion device 22 and transmitting the received reflected laser light to the spectrum conversion device 112; the spectrum conversion device 112 is used for receiving the reflected laser light and converting the reflected laser light into a spectrum; the processing means 113 is connected to the spectrum converting means 112 for receiving the spectrum and comparing it with a pre-stored spectrum database to determine other components and/or contents to be detected. In a specific implementation, the laser receiving device 111 may be a combination of optical devices such as a lens and a total reflection mirror, and the specific structure of the laser receiving device 111 is not limited in this embodiment. The spectrum conversion device 112 may be a spectrum detector, and the processing device 113 may be a processor such as a single chip DSP.
The foregoing embodiments may further include: and carrying on the vehicle on the ground. Wherein, the spectrum data processing device 11 is arranged on the ground vehicle. Specifically, the surface vehicle-mounted device may be a motor vehicle or the like, and the spectral data processing device 12 is provided on the surface vehicle-mounted device. Therefore, the ground vehicle-mounted movement can drive the ground system 1 to move to any position on the ground, the position of the ground system 1 is convenient to adjust, and the detection efficiency can be greatly improved.
Referring to fig. 1 to 3, in order to make the spectral data processing device 12 correspond to the optical path conversion device 22 better, the above embodiments may further add: a first positioning system. The first positioning system is used to determine that the flying device 21 is located within a preset range above the ground system 1, so that the spectral data processing device 11 can receive the reflected laser light turned by the optical path switching device 22.
In one embodiment of the present invention, the first positioning system may include: a laser, a light-sensing plate and a receiving device. Wherein, the laser is arranged on the vehicle in the ground system 1 and is used for emitting laser to the bottom of the flying device 21; the light sensing plate can be arranged at the bottom of the flying device 21 and used for receiving laser emitted by the laser and returning a light sensing electric signal; receiving means are provided on the ground system 1 for receiving the returned photo-electric signal and determining whether the flying device 21 is within a preset range based on the photo-electric signal. The receiving device may determine that the flying device 21 is within the preset range when receiving the electrical signal, and confirm that the flying device 21 is outside the preset range when the receiving device does not receive the electrical signal. The ground system 1 emits vertical positioning laser at a certain frequency to correct the vertical position of the ground system 1 and the flying device 21, and in specific implementation, a laser fast positioning system can be adopted, for example, the positioning signal is transmitted more than 100 times per second.
In another embodiment of the present invention, the first positioning system may include a first GPS system, a second GPS system, and a control device. The first GPS system is arranged on the ground system 1 and is used for positioning the position of the ground system 1; the second GPS system is arranged on the flight system 2 and used for positioning the position of the flight system; the control device is connected with the first GPS system and the second GPS system and is used for receiving the positions of the ground system 1 and the flight system 2 and controlling the flight system 1 to enable the flight system 2 to be arranged in a preset range above the ground system 1. In specific implementation, the control device may be connected to a control system in the flying device 21, and when the flying device 21 is out of the preset range, the control device sends a position adjusting signal to the flying device 21, and the flying device 21 adjusts the position to be within the preset range according to the position adjusting signal. The control device can be a singlechip, a DSP and the like.
It should be noted that, in specific implementation, the preset range may be determined according to actual situations, and this embodiment does not limit the preset range at all.
It can be seen that, in the present embodiment, the first positioning system is used to position the flying device 21, so that the spectral data processing device 12 can be ensured to receive the laser reflected by the detected area.
In order to achieve a better detection effect, the embodiment can be further improved, and the following steps are added: a second positioning system. The second positioning system is disposed on the flying device 21, and is configured to ensure that a distance between the flying device 21 and the detected area is within a preset distance. In particular, the second positioning system may comprise a laser and a receiving device. The laser emits laser to the detected device, the detected area reflects the laser emitted by the laser, the receiving device receives the laser reflected by the detected area, and the distance between the flying device 21 and the detected area is determined according to the received reflected laser.
In this embodiment, the second positioning system can ensure that the flying device 21 is within a preset distance from the detected area, thereby better ensuring the detection effect.
In the above embodiment, the second positioning system is further configured to send an abnormal detection alarm signal when the reflection distance is smaller than the preset distance; the reflection distance is the distance between the optical path conversion device 22 and the laser reflection point in the detected region. For example, for the detection of gas pipelines in a residential building, assuming that the distance between the flying device 21 and the residential building is 10 meters, and the depth of the residential building is 4 meters, the reflection distance should be 10 meters to 14 meters. If the reflection distance is 10 meters, the laser is considered to be possibly blocked by the curtain at the window of the residential building, the detection is judged to be wrong, and an abnormal alarm signal is sent out.
The following will describe the embodiments of the present invention in more detail by taking the detection of methane gas in a residential building as an example:
the laser emitting device selects a diode laser, the flying device selects an unmanned aerial vehicle, and the light path conversion device selects a prism. Prism among the light path conversion equipment installs the lower extreme at unmanned aerial vehicle, during the installation, will guarantee certain angle, this angle mainly is to take place the total reflection when guaranteeing laser through light path conversion equipment to make laser shine to spectral data processing apparatus along vertical direction, the total reflection angle can be confirmed according to the formula, wherein, c is critical angle, n is the refracting index, make laser use critical angle incident prism, the prism can select for use the material to be glass's prism, glass's critical angle is: 32-42 degrees. During the installation, make prism transmission limit and the perpendicular 45 jiaos that becomes in ground to with this angle invariant of fixed assurance unmanned aerial vehicle duration of prism installation, this kind of mounting means can guarantee to reflect to the horizontal directive spectrum data processing apparatus of total reflection behind the laser directive prism. In addition, the spectral data processing device 12 is also integrated into the surface system.
Because methane gas absorption wavelength is 1653.7nm, so when detecting, adjust near 1653.7nm with laser emission device 11's laser emission wavelength earlier, then adjust unmanned aerial vehicle's flight position, the laser that makes laser instrument transmission in the positioning system can shoot on the sensitization board of unmanned aerial vehicle lower extreme, spectral data processing apparatus 11 can receive the laser of reflection return that light path conversion equipment turned to this moment, unmanned aerial vehicle is at this position unstability, the laser that the laser instrument launches is followed the horizontal direction and is shot to the detected region, laser is by the gaseous reflection that awaits measuring, the absorbed laser of reflection return is passed through the prism among the light path conversion equipment and is carried out spotlight, laser after the spotlight transmits spectral data processing apparatus in the air, spectral data processing apparatus carries out spectral analysis to the laser of launching back, reachs and is surveyed gaseous composition and content.
In summary, in the embodiment of the invention, the laser emitting device and the spectral data processing device which are heavier in weight are arranged on the ground, and only the light path conversion device which is lighter in weight is carried into the air through the flying device, so that the burden of the flying device is greatly lightened, the driving range of the flying device is increased, and the gas detection in a larger area can be completed at one time.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.
Claims (10)
1. A gas detection system, comprising: a ground system (1) and a flight system (2); wherein,
the ground system (1) comprises a spectral data processing device (11); the flight system (2) comprises a flight device (21), a laser emitting device (23) and a light path conversion device (22), wherein the laser emitting device (23) and the light path conversion device are arranged on the flight device (21);
the laser emitting device (23) is used for emitting laser to the detected area; the light path conversion device (22) is used for receiving the laser reflected by the detected area and diverting the received reflected laser to a spectral data processing device (11);
the spectral data processing device (11) is used for receiving the reflected laser, extracting parameters of the reflected laser, and determining the gas composition and/or content of the detected area according to the parameters of the reflected laser and prestored parameters of the laser emitted by the laser emitting device (23).
2. The gas detection system according to claim 1, wherein the laser emitting device (23) is a single wavelength laser emitting device.
3. The gas detection system according to claim 1, wherein the spectral data processing device (11) comprises: a laser receiving device (111), a spectrum conversion device (112) and a processing device (113); wherein,
the laser receiving device (111) is used for receiving the reflected laser light turned by the optical path conversion device (22) and transmitting the received reflected laser light to the spectrum conversion device (112);
the spectrum conversion device (112) is used for receiving the reflected laser light and converting the reflected laser light into a spectrum;
and the processing device (113) is connected with the spectrum conversion device and is used for receiving the spectrum and comparing the spectrum with a prestored spectrum database to determine other detected components and/or contents.
4. The gas detection system of claim 1,
the laser reflected by the detected area received by the optical path conversion device (22) is transmitted to the spectral data processing device (11) through air or optical fiber.
5. The gas detection system of claim 1, further comprising:
the device is characterized by being carried on a ground vehicle, and the spectral data processing device (11) is arranged on the ground vehicle.
6. The gas detection system of any one of claims 1 to 5, further comprising:
and the first positioning system is used for determining that the flying device (21) is arranged in a preset range above the ground system (1) so that the spectral data processing device (11) receives the reflected laser light turned by the light path conversion device (22).
7. The gas detection system of claim 6, wherein the first positioning system comprises:
the laser is arranged on the ground system (1) and used for emitting laser to the flying device;
the light sensing plate is arranged at the bottom of the flying device (21) and used for receiving the laser emitted by the laser and returning a light sensing electric signal;
the receiving device is arranged on the ground system (1) and used for receiving the returned photosensitive electric signal and determining whether the flying device (21) is located in a preset range above the ground system (1) or not according to the returned photosensitive electric signal.
8. The gas detection system of claim 6, wherein the first positioning system comprises: the system comprises a first GPS system, a second GPS system and a control device; wherein,
the first GPS system is arranged on the ground system (1) and is used for positioning the position of the ground system (1);
the second GPS system is arranged on the flight system (2) and is used for positioning the position of the flight system (2);
and the control device is connected with the first GPS system and the second GPS system and is used for receiving the positions of the ground system (1) and the flight system (2) and controlling the flight system (2) so that the flight system (2) is arranged in a preset range above the ground system (1).
9. The gas detection system of any one of claims 1 to 5, further comprising:
and the second positioning system is arranged on the flying device (21) and used for ensuring that the distance between the laser emitting device (23) and the detected area is within a preset distance range.
10. The gas detection system of claim 9,
the second positioning system is also used for sending an abnormal detection alarm signal when the reflection distance is smaller than the preset distance; the reflection distance is the distance between the laser emitting device (23) and a laser reflection point in the detected area.
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| CN201510771272.6A CN105444970A (en) | 2015-11-12 | 2015-11-12 | Gas detection system |
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| CN201510771272.6A CN105444970A (en) | 2015-11-12 | 2015-11-12 | Gas detection system |
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Application publication date: 20160330 |