CN110793934A - Motor vehicle exhaust synchronous diffusion model detection method based on large light spots - Google Patents
Motor vehicle exhaust synchronous diffusion model detection method based on large light spots Download PDFInfo
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Abstract
The invention discloses the field of remote sensing detection of motor vehicle tail gas, and more particularly discloses a motor vehicle tail gas synchronous diffusion model detection method based on large light spots, the invention obtains a large light spot diffuse reflection light beam through the step (2), the coaxiality of the laser beams in the large-spot diffuse reflection beam is more uniform, the laser beams can be perfectly superposed, in addition, when the large-spot diffuse reflection light beam passes through the tail gas, the tail gas coverage is larger, and meanwhile, the diffuse reflection instrument with the aluminum flake in the step (2) is used, the diffuse reflection instrument adopts the aluminum sheet to perform the reflection mode, thereby solving the problems that the light beam adjustment is performed by adopting the mirror reflection mode in the prior art, the mirror reflection is sensitive to the light path change, the light beam deviation is easily caused, and the great inconvenience and the mirror maintenance amount are brought to the stable operation of equipment, so that the interference resistance of the large-spot diffuse reflection light beam can be enhanced.
Description
Technical Field
The invention discloses the field of remote sensing detection of motor vehicle tail gas, and particularly discloses a motor vehicle tail gas synchronous diffusion model detection method based on large light spots.
Background
The tail gas can be diffused immediately after being discharged, the tail gas synchronous diffusion model can be regarded as a process of gradually and synchronously diffusing the smoke plume with the highest central concentration to the periphery, the diffusion degree of each component in different tail gas smoke plume positions is different before the tail gas synchronous diffusion model is completely diffused, the tail gas concentration at the same smoke plume position is dynamically changed, and each component at each smoke plume position can be regarded as being diluted in the same proportion; when a detection light beam passes through a smoke plume, the detection light beam of any component deviates from a tail gas synchronous diffusion model as long as the position of the detection light beam of any component is different, the tail gas synchronous diffusion effect is usually evaluated by adopting the linear regression fitting degree of the diffusion profiles of two components in the conventional tail gas remote sensing detection, equipment continuously obtains data of each component of tail gas in the tail gas diffusion process, the obtained data of each component of multiple groups of tail gas are subjected to linear fitting, and the tail gas synchronous diffusion model is evaluated according to the linear fitting degree Degree multiplied by effective absorption optical path), and inverting the relative smoke plume ratio into the tail gas concentration by means of engine chemical combustion equation theory, wherein the combustion equation is published in the prior patent (201611017085.X), so that the tail gas measurement accuracy is determined by a synchronous diffusion model of each component in the tail gas, the relative smoke plume ratio is strictly required to be kept unchanged all the time in the tail gas diffusion process, the synchronous diffusion of each component in the tail gas means that the dilution multiple of each component is the same at the same time, the relative smoke plume ratio can be kept constant, however, the synchronous diffusion of each component in the tail gas is related to the distribution of a detection beam passing through the tail gas, the more uniform the distribution of the beam indicates that the beam detection is always the same tail gas detection point, each component can be considered to have undergone the same diffusion time and distance from the initial discharge to the tail gas detection point, and the embodied is the synchronous diffusion process of each component in the tail gas, so that the uniformity of the detection beam passing through the, in traditional motor vehicle exhaust remote sensing check out test set, in order to detect multiple species simultaneously, often need use multiple light source phase combination, multiple light source has the multi-beam of adoption and has also the beam structure who adopts each light source independent transmission, wherein the beam of combining is sent and is hardly guaranteed each light source light beam perfect coincidence, along with the increase of measuring the optical distance, the tail gas synchronous diffusion model is deviated more easily to beam combining light detection effect, for example infrared lamp and ultraviolet lamp combination are big facula form transmission after the beam coupling, infrared and ultraviolet ray all belong to the broadband light source, the unable complete coaxial characteristics of both optical axes lead to the position that the light beam passed tail gas to have the difference, be unfavorable for the structure of tail gas synchronous diffusion model, secondly both low spectral resolution have restricted detectivity. In addition, a near infrared laser and an ultraviolet lamp are combined and emitted after light beam coupling, the detection sensitivity of the laser is high, but the diameters of light beams of a narrow light beam laser and a wide light beam ultraviolet lamp are greatly different, the positions of two light beams penetrating through tail gas are different and do not meet the requirement of ideal detection position for synchronous diffusion of the tail gas, and a plurality of tunable lasers are combined in the prior art, each laser respectively emits light beams, all the laser light beams are not overlapped with each other, the light beam structure respectively detects components at different positions in the tail gas, the diffusion and dilution degrees of the components are different at the same time, so the detected tail gas synchronous diffusion effect is not good naturally, the detection sensitivity of the laser is high, but the laser light beams are narrow, and even if the light beams of the plurality of lasers are combined and emitted by adopting a light beam coupling technology, the light beams are difficult to be perfectly superposed, in addition, the tail gas which is continuously diffused and dynamically diluted is detected by the device, the more the tail gas detected by the device is, the more the cross section of the tail gas which is penetrated by the narrow laser beam is, the contained tail gas information is limited, and finally, the existing tail gas remote sensing detection device usually adopts a mirror reflection mode to adjust the light beam, the simple mirror reflection is sensitive to the light path change, the light beam deviation is easily caused, and the great inconvenience and the mirror maintenance amount are brought to the stable operation of the device.
Disclosure of Invention
In view of the above, the present invention provides a method for detecting a large-spot synchronous diffusion model of motor vehicle exhaust based on a narrow-diameter coupled light beam, wherein the method is used for detecting the synchronous diffusion effect of the exhaust detected when the narrow-diameter coupled light beam and the large-spot diffuse reflected light beam pass through the exhaust, and the large-spot diffuse reflected light beam can enhance anti-interference performance, so as to solve the problems of unstable light path of the narrow-diameter coupled light beam and poor detection effect in the synchronous diffusion model of the exhaust, thereby improving the accuracy of the exhaust detection.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for detecting a synchronous diffusion model of motor vehicle tail gas based on large light spots comprises the following steps:
obtaining a narrow-diameter coupled light beam in the step (1): combining the light beams with the corresponding component target absorption wavelengths emitted by the emitting end by adopting a laser beam coupling technology to obtain a narrow-diameter coupled light beam;
and (2) obtaining a large-spot diffuse reflection light beam: after the narrow-diameter coupling light beam obtained in the step (1) is subjected to diffuse reflection by a diffuse reflection instrument with an aluminum sheet, a large-spot diffuse reflection light beam is obtained;
and (3) realizing the detection of the tail gas target: enabling the large-spot diffuse reflection light beam obtained in the step (2) to pass through tail gas, absorbing the tail gas and transmitting the tail gas into a receiving end, and realizing the detection of a tail gas target;
the relative smoke plume ratios of CO, CH, NO and CO2 measured by the narrow-diameter coupling light beam in the step (4): adjusting the emission end to the tail gas emission height, when a vehicle passes through, obtaining multiple groups of tail gas information samples of the narrow-diameter coupled light beam passing through the tail gas and continuously measuring the tail gas diffusion process in the step (1), respectively carrying out linear fitting analysis on CO, CH, NO and CO2 in the multiple groups of tail gas samples to obtain the linear fitting degree of CO, CH, NO and CO2 in the tail gas under the narrow-diameter coupled light beam, wherein the slope in a linear fitting equation is the relative smoke plume ratio of CO, CH, NO and CO2 measured under the narrow-diameter coupled light beam;
and (5) measuring the relative smoke plume ratios of CO, CH, NO and CO2 under the large-spot diffuse reflection light beam: exchanging the transmitting end and the receiving end of the equipment according to the same method, enabling the large light spot diffuse reflection light beam at the receiving end to be located at the tail gas emission height, when a vehicle passes through, enabling the large light spot diffuse reflection light beam at the receiving end to pass through tail gas and continuously measuring a plurality of groups of tail gas information samples in the tail gas diffusion process, respectively carrying out linear fitting on CO, CH, NO and CO2 in the obtained groups of tail gas samples to obtain the linear fitting degree of CO, CH, NO and CO2 of the tail gas under the large light spot diffuse reflection light beam, wherein the slope in a linear fitting equation is the relative smoke plume ratio of CO, CH, NO and CO2 measured under the large light spot diffuse reflection light beam;
and (6) evaluating the detection effect of the light beams with different diameters on the tail gas synchronous diffusion model: by comparing the linear fitting degrees of CO, CH, NO and CO2 in the tail gas in the two cases of the step (4) and the step (5), the detection effect of the light beams with different diameters on the tail gas synchronous diffusion model is evaluated, and the linear fitting degree of each component of the tail gas measured by the large-spot diffuse reflection light beams is obviously higher than that of the narrow-diameter coupled light beams from the comparison result;
and (7) performing dynamic jet auditing to simulate vehicle exhaust emission: and respectively placing dynamic gas injection in a narrow-diameter coupled light beam light path at a transmitting end and a large-spot diffuse reflection light beam light path at a receiving end, controlling the dynamic gas injection to inject standard mixed gas with known concentration into light paths in the narrow-diameter coupled light beam light path and the large-spot diffuse reflection light beam light path, and respectively obtaining the linear fitting degrees of CO, CH, NO and CO2 in the standard gas under different-diameter detection light beams by referring to the tail gas fitting method.
Preferably, the emitting end in the step (1) is composed of a laser control unit, two or more lasers and a laser beam coupling unit, wherein the lasers respectively emit target absorption wavelengths of corresponding components under the control of the laser control unit, and the emission beams of the lasers are coupled by the laser beam coupling unit to obtain a narrow-diameter coupled beam.
Preferably, the receiving end in the step (3) is composed of a detector and a data acquisition and processing unit, wherein the large-spot diffuse reflection light beam in the step (2) is emitted into the detector in the receiving end, and then a tail gas signal detected by the detector is processed by the data acquisition and processing unit and the concentration of the tail gas is calculated.
Compared with the prior art, the invention has the following beneficial technical effects:
1. according to the invention, the large-spot diffuse reflection light beam is obtained in the step (2), the coaxiality of each laser beam in the large-spot diffuse reflection light beam is more uniform, each laser beam can be perfectly superposed, and in addition, the tail gas coverage area is larger when the large-spot diffuse reflection light beam passes through the tail gas.
2. The invention evaluates the detection effect of the light beams with different diameters in the tail gas synchronous diffusion model through the step (6), the linear fitting degree of each component of the tail gas measured by the large-light-spot diffuse reflection light beam is obviously higher than that of the narrow light beam, which shows that the large-light-spot light beam is more favorable for the detection of the synchronous diffusion of the tail gas, the optical axis distribution of each laser light beam in the narrow-light-beam large-light-spot light beam is more uniform, the dilution times of CO, CH, NO and CO2 detected at each position in the passing tail gas are similar, thereby solving the problems that the narrow-diameter coupled light beams in the prior art can not be perfectly and coaxially combined, the paths of all component detection light beams in the narrow light beams passing through the tail gas plume always have differences, the dilution times of the detected CO, CH, NO and CO2 are different, in addition, the effective absorption optical paths of tail gas penetrated by light beams at different positions are also different, and the combined action of the two causes the problem of poor tail gas synchronous diffusion effect of narrow-diameter coupled light beam detection.
3. According to the invention, the vehicle tail gas emission is simulated by performing dynamic gas injection verification in the step (7), and the dynamic gas injection has the advantages that the synchronous diffusion detection effect of the light beams with different diameters on the standard gas can be evaluated, the detection result can be traced, and the standard gas detection accuracy can be quantized.
4. According to the diffuse reflection instrument with the aluminum flake in the step (2), the diffuse reflection instrument adopts the aluminum flake for reflection, so that the problems that in the prior art, a mirror reflection mode is adopted for light beam adjustment, the mirror reflection is sensitive to light path change, light beam deviation is easy to cause, great inconvenience is brought to stable operation of equipment, and the mirror maintenance amount is large are solved, and therefore the interference resistance of the large-spot diffuse reflection light beam can be enhanced.
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FIG. 1: the invention discloses a schematic diagram for converting a narrow-diameter coupled light beam into a large-spot diffuse reflection light beam;
FIG. 2: schematic diagram of the transmitting end of the invention;
FIG. 3: schematic diagram of the receiving end of the invention;
FIG. 4: a model diagram of a narrow diameter coupled beam of the present invention;
FIG. 5: the invention discloses a model diagram of a large-spot diffuse reflection light beam;
FIG. 6: the invention has the advantages that the linear fitting result of CO, CH, NO and CO2 of the tail gas penetrated by the narrow-diameter coupling light beam and the smoke plume diffusion profile are shown schematically;
FIG. 7: according to the invention, the linear fitting result of CO, CH, NO and CO2 of the large-spot diffuse reflection light beam penetrating through the tail gas and the smoke plume diffusion profile schematic diagram are obtained.
Wherein: 101-a transmitting end; 101-narrow diameter coupled beam; 102-a diffuse reflector; 103-large spot diffuse reflection light beam; 104-tail gas; 105-a receiving end; 201-exhaust pipe; 202-a probe beam; 203-an absorption optical path frame; 100-1-a laser control unit; a 100-2-laser; 100-3-laser beam coupling unit; 105-1-detector; 105-2-data acquisition processing unit.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in order to make the technical solution of the present invention easier to understand and understand.
As shown in fig. 1, a method for detecting a vehicle exhaust synchronous diffusion model based on a large light spot includes the following steps:
obtaining a narrow-diameter coupled light beam in the step (1): combining the light beams with the corresponding component target absorption wavelengths emitted by the emitting end 100 by adopting a laser beam coupling technology to obtain a narrow-diameter coupled light beam 101;
and (2) obtaining a large-spot diffuse reflection light beam: after the narrow-diameter coupling light beam 101 obtained in the step (1) is subjected to diffuse reflection by a diffuse reflection instrument 102 with a thin aluminum sheet, a large-spot diffuse reflection light beam 103 is obtained;
and (3) realizing the detection of the tail gas target: and (3) enabling the large-spot diffuse reflection light beam 103 obtained in the step (2) to pass through tail gas 104, absorbing the tail gas by the tail gas 104, and transmitting the tail gas into a receiving end 105, so that the target detection of the tail gas is realized.
As shown in fig. 2, in the step (1), the emitting end 100 is composed of a laser control unit 100-1, two or more lasers 100-2 and a laser beam coupling unit 100-3, wherein the lasers 100-2 respectively emit target absorption wavelengths of corresponding components under the control of the laser control unit 100-1, and emission beams of the lasers 100-2 are coupled by the laser beam coupling unit 100-3 to obtain a narrow-diameter coupled beam 101.
As shown in fig. 3, in the step (3), the receiving end 105 is provided with a detector 105-1 and a data acquisition and processing unit 105-2, wherein the large-spot diffuse reflected light beam 103 in the step 2 is emitted to the detector 105-1 in the receiving end 105, and then the tail gas 104 signal detected by the detector 105-1 is processed by the data acquisition and processing unit 105-2 and the concentration of the tail gas 104 is calculated.
As shown in fig. 4, the tail gas 104 emitted from the exhaust pipe 201 is rapidly diffused from the center to the periphery, wherein the tail gas concentration is highest at the center position, the tail gas boundary concentration is gradually reduced, the detection light beam 202 represents several narrow laser light beams which are not combined or combined light beams which are combined and cannot be perfectly overlapped, each laser light beam respectively detects one component, each light beam respectively passes through different spatial positions of the tail gas 104, is absorbed by corresponding components in the tail gas 104 and then is transmitted to the receiving end 105 to be detected, wherein the diffusion degree of the tail gas 104 detected by each light beam is different from the absorption optical path 203, and finally the tail gas diffusion result detected by the light beam structure deviates from a tail gas synchronous diffusion model.
As shown in fig. 5, the tail gas 104 emitted from the exhaust pipe 201 rapidly diffuses from the center to the periphery, wherein the concentration of the tail gas 104 at the center is highest, the concentration of the boundary of the tail gas 104 gradually decreases, the probe beam 202 represents the large-spot diffuse reflected beam 103 obtained by diffusely reflecting the combined beams of the lasers, the large-spot diffuse reflected beam 103 passes through the same spatial position of the tail gas 104 and is transmitted to the receiving end 105 after being absorbed by each component in the tail gas 104 and is detected, wherein the diffusion degree of the tail gas 104 at the same spatial position of the tail gas 104 is equal to the absorption optical path 203, and finally the tail gas diffusion result measured by the beam structure approaches to a tail gas synchronous diffusion model.
As shown in fig. 6, the relative smoke plume ratios of CO, CH, NO and CO2 measured by the narrow-diameter coupled beam in step (4): adjusting the emission end 100 to the tail 104 emission height, when a vehicle passes through, obtaining multiple groups of tail gas information samples of a narrow-diameter coupled light beam 101 passing through the tail gas and continuously measuring the tail gas diffusion process, respectively performing linear fitting analysis on CO, CH, NO and CO2 in the multiple groups of tail gas samples to obtain the linear fitting degree of CO, CH, NO and CO2 in the tail gas under the narrow-diameter coupled light beam, wherein the slope in a linear fitting equation is the relative smoke plume ratio of CO, CH, NO and CO2 measured under the narrow-diameter coupled light beam, 301, 302 and 303 are respectively linear fitting graphs of NO/CO2, CH/CO2 and CO/CO2 measured by the narrow light beam, the horizontal coordinates all represent CO2 smoke plume values (concentration is multiplied by absorption optical path length) and are in ppm m, the vertical coordinates represent NO, CH and CO smoke plume values respectively, the units are in ppm cm and the CO units are in ppm m, 304 is a smoke plume value of CO, CH, NO and CO2 which changes along with diffusion time in a tail gas diffusion process, the abscissa represents tail gas diffusion time, the ordinate represents smoke plume values of CO, CH, NO and CO2, the linear fitting result comprises a linear fitting equation and a linear fitting degree, the slope in the linear fitting equation represents the relative volume concentration ratio of each component of the tail gas, the linear fitting degree represents the synchronous diffusion degree of each component of the tail gas, and meanwhile, the smoke plume diffusion profile change comprises the smoke plume values of CO, CH, NO and CO2 measured in tail gas diffusion, whether the change trends of CO, CH, NO and CO2 in the tail gas are synchronous or not is visually reflected, and the linear fitting degrees of the CO, CH, NO and CO2 measured under the narrow-diameter coupling light beam light are respectively 0.8, 0.96 and 0.7 from the linear fitting result.
As shown in fig. 7, the relative smoke plume ratios of CO, CH, NO and CO2 measured under the large-spot diffuse reflection light beam in step (5): exchanging the transmitting end and the receiving end of the equipment according to the same method, enabling the large-spot diffuse reflection light beam at the receiving end to be located at the exhaust emission height, when a vehicle passes through, enabling the large-spot diffuse reflection light beam at the receiving end to pass through the exhaust and continuously measuring a plurality of groups of exhaust information samples in the exhaust diffusion process, respectively performing linear fitting on CO, CH, NO and CO2 in the obtained groups of exhaust samples to obtain the linear fitting degree of CO, CH, NO and CO2 of the exhaust under the large-spot diffuse reflection light beam, wherein the slope in a linear fitting equation is the relative smoke plume ratio of CO, CH, NO and CO2 measured under the large-spot diffuse reflection light beam, 401, 402 and 403 are respectively linear fitting graphs of NO/CO2, CH/CO2 and CO/CO2 measured by the large-spot light beam, the horizontal coordinates all represent the smoke plume values (concentration multiplied by absorption optical path) of CO2, the unit is ppm, and the vertical coordinates represent the smoke plume values of NO, the unit of NO and CH is ppm cm, the unit of CO is ppm m, 404 is a smoke plume value of CO, CH, NO and CO2 which changes along with diffusion time in a tail gas diffusion process, the abscissa represents tail gas diffusion time, the ordinate represents a smoke plume value of CO, CH, NO and CO2, the linear fitting result comprises a linear fitting equation and a linear fitting degree, the slope in the linear fitting equation represents the relative volume concentration ratio of each component of the tail gas, the linear fitting degree represents the synchronous diffusion degree of each component of the tail gas, and the smoke plume diffusion profile change comprises the smoke plume values of CO, CH, NO and CO2 measured in tail gas diffusion, so that whether the change trends of CO, CH, NO and CO2 in the tail gas are synchronous or not is intuitively reflected, and the linear fitting degrees of CO, CH, NO and CO2 measured under a large-spot diffuse reflection light beam are respectively 0.99, 0.99 and 0.98 from the linear fitting result.
And (6) evaluating the detection effect of the light beams with different diameters on the tail gas synchronous diffusion model: by comparing the linear fitting degrees of CO, CH, NO and CO2 in the tail gas in the two cases of the step (4) and the step (5), the detection effect of the light beams with different diameters on the tail gas synchronous diffusion model is evaluated, and the linear fitting degree of each component of the tail gas measured by the large-spot diffuse reflection light beams is obviously higher than that of the narrow-diameter coupled light beams from the comparison result;
and (7) performing dynamic jet auditing to simulate vehicle exhaust emission: dynamic gas injection is respectively placed in a narrow-diameter coupled light beam light path at a transmitting end and a large-spot diffuse reflection light beam light path at a receiving end, then the dynamic gas injection is controlled to inject standard mixed gas with known concentration into the light paths in the narrow-diameter coupled light beam light path and the large-spot diffuse reflection light beam light path, the linear fitting degree of CO, CH, NO and CO2 in the standard gas under different-diameter detection light beams is respectively obtained by referring to the tail gas fitting method, and is influenced by synchronous diffusion difference of tail gas under different-diameter light beams, relative errors between the smoke plume ratios of CO, CH, NO and CO2 measured under the narrow-diameter coupled light beam light and the concentration ratios of CO, CH, NO and CO2 in the standard gas are also larger than that of the large-spot diffuse reflection light beam, and the detection accuracy of the tail gas under the narrow-diameter coupled light beam light is.
The above is, of course, only a specific application example of the present invention, and the scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (3)
1. A method for detecting a synchronous diffusion model of motor vehicle tail gas based on large light spots is characterized by comprising the following steps:
obtaining a narrow-diameter coupled light beam in the step (1): combining the light beams with the corresponding component target absorption wavelengths emitted by the emitting end by adopting a laser beam coupling technology to obtain a narrow-diameter coupled light beam;
and (2) obtaining a large-spot diffuse reflection light beam: after the narrow-diameter coupling light beam obtained in the step (1) is subjected to diffuse reflection by a diffuse reflection instrument with an aluminum sheet, a large-spot diffuse reflection light beam is obtained;
and (3) realizing the detection of the tail gas target: enabling the large-spot diffuse reflection light beam obtained in the step (2) to pass through tail gas, absorbing the tail gas and transmitting the tail gas into a receiving end, and realizing the detection of a tail gas target;
the relative smoke plume ratios of CO, CH, NO and CO2 measured by the narrow-diameter coupling light beam in the step (4): adjusting the emission end to the tail gas emission height, when a vehicle passes through, obtaining multiple groups of tail gas information samples of the narrow-diameter coupled light beam passing through the tail gas and continuously measuring the tail gas diffusion process in the step (1), respectively carrying out linear fitting analysis on CO, CH, NO and CO2 in the multiple groups of tail gas samples to obtain the linear fitting degree of CO, CH, NO and CO2 in the tail gas under the narrow-diameter coupled light beam, wherein the slope in a linear fitting equation is the relative smoke plume ratio of CO, CH, NO and CO2 measured under the narrow-diameter coupled light beam;
and (5) measuring the relative smoke plume ratios of CO, CH, NO and CO2 under the large-spot diffuse reflection light beam: exchanging the transmitting end and the receiving end of the equipment according to the same method, enabling the large light spot diffuse reflection light beam at the receiving end to be located at the tail gas emission height, when a vehicle passes through, enabling the large light spot diffuse reflection light beam at the receiving end to pass through tail gas and continuously measuring a plurality of groups of tail gas information samples in the tail gas diffusion process, respectively carrying out linear fitting on CO, CH, NO and CO2 in the obtained groups of tail gas samples to obtain the linear fitting degree of CO, CH, NO and CO2 of the tail gas under the large light spot diffuse reflection light beam, wherein the slope in a linear fitting equation is the relative smoke plume ratio of CO, CH, NO and CO2 measured under the large light spot diffuse reflection light beam;
and (6) evaluating the detection effect of the light beams with different diameters on the tail gas synchronous diffusion model: by comparing the linear fitting degrees of CO, CH, NO and CO2 in the tail gas in the two cases of the step (4) and the step (5), the detection effect of the light beams with different diameters on the tail gas synchronous diffusion model is evaluated, and the linear fitting degree of each component of the tail gas measured by the large-spot diffuse reflection light beams is obviously higher than that of the narrow-diameter coupled light beams from the comparison result;
and (7) performing dynamic jet auditing to simulate vehicle exhaust emission: and respectively placing dynamic gas injection in a narrow-diameter coupled light beam light path at a transmitting end and a large-spot diffuse reflection light beam light path at a receiving end, controlling the dynamic gas injection to inject standard mixed gas with known concentration into light paths in the narrow-diameter coupled light beam light path and the large-spot diffuse reflection light beam light path, and respectively obtaining the linear fitting degrees of CO, CH, NO and CO2 in the standard gas under different-diameter detection light beams by referring to the tail gas fitting method.
2. The method for detecting the synchronous diffusion model of the motor vehicle exhaust based on the large light spot as claimed in claim 1, wherein the emitting end in the step (1) is composed of a laser control unit, two or more lasers and a laser beam coupling unit, wherein the lasers respectively emit target absorption wavelengths of corresponding components under the control of the laser control unit, and the narrow-diameter coupled beams are obtained after the light beams emitted by the lasers are coupled by the laser beam coupling unit.
3. The method for detecting the synchronous diffusion model of the motor vehicle exhaust based on the large light spot according to claim 1, wherein the receiving end in the step (3) is provided with a detector and a data acquisition and processing unit, wherein the large light spot diffuse reflection light beam in the step 2 is emitted to the detector in the receiving end, and then an exhaust signal detected by the detector is processed by the data acquisition and processing unit and the exhaust concentration is calculated.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113970523A (en) * | 2021-09-17 | 2022-01-25 | 安徽中科华仪科技有限公司 | A shore-based all-laser remote sensing detection method for ship exhaust |
| CN113984967A (en) * | 2021-10-25 | 2022-01-28 | 河北先河环保科技股份有限公司 | Ship exhaust gas monitoring method, device, system, terminal and storage medium |
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