CN108333131A - Tail gas measuring devices and methods therefor - Google Patents

Abstract

Present disclose provides a kind of Tail gas measuring devices and methods therefors, including light source emitter, corner cube mirror, matrix reflecting plate, light source receiver and control platform；It is orderly layouted on matrix reflecting plate and multiple corner cube mirrors is set, it opens light source emitter transmitting light beam and light source receiver is reflexed to by corner cube mirror, the beam data rolled into a ball by motor-vehicle tail-gas cigarette collected to light source receiver carries out data analysis and calculating.The multiple reflections of the disclosure having the beneficial effect that using the more optical-path light-paths of various dimensions in the horizontal direction and the vertical direction, so that measuring beam spatially forms the light field square formation of a rectangular cross-section, motor vehicle can run over the light beam area of coverage at a relatively high speed in this optics covering surface, significantly increase since light beam has on spatial altitude and width, so that continuous capturing ability improves, detection accuracy is high.

Description

Exhaust gas detection device and method thereof

technical field

The disclosure relates to the field of environmental protection industry for preventing and controlling air pollution and the monitoring technical field of spectral absorption of molecules and atoms, in particular to an exhaust gas detection device and a method thereof.

Background technique

With the development of industry, the degree of air pollution is increasing day by day, and the quality of air environment is declining day by day, posing a huge threat to human living and living environment. Among them, the emission of motor vehicle exhaust as the main source of pollutants has become a problem that cannot be ignored. Some of these high-emitting vehicles are the most polluting.

In the detection of motor vehicle exhaust, the acquisition of the absorption spectrum of exhaust pollutants and the accurate measurement of the inversion concentration are the biggest technical difficulties in this field. Most of the existing measurement equipment is single-light path or double-light path detection. The detection is maintained at the two-dimensional level. The capture rate of the actual puff is low, and the requirements for the wind direction are very strict. For the measurement of vehicle speed below 30km/h, the uncertainty of measuring the concentration of pollutants is large, and the sensitivity to feedback of external interference factors has become a technical problem that limits the accuracy of existing measurement equipment.

Therefore, it is a technical problem to be solved urgently by those skilled in the art in order to ensure that in the complex environment of measurement, the data of exhaust gas emitted by motor vehicles can be captured to the greatest extent so as to make the data more real.

Contents of the invention

(1) Technical problems to be solved

The present disclosure provides an exhaust gas detection device and its method to at least partly solve the above-mentioned technical problems.

(2) Technical solutions

According to one aspect of the present disclosure, an exhaust gas detection device is provided, including: matrix reflectors, the matrix reflectors are arranged in pairs and parallel to each other; the number of dots on each array reflector is q; The layout form is w*r, where w is the number of columns and r is the number of rows; right-angle mirrors, right-angle mirrors are set on the distribution of matrix reflectors; the number of right-angle mirrors is q', and the layout form of right-angle mirrors is m *n, where m is the number of columns, n is the number of rows; q≥q', w≥m, r≥n; the light source emitter, which is arranged on the point (w1, r1) of a matrix reflector, the light source emitter The emitted beam is reflected to (w1, m) by the right-angle mirror arranged on the two matrix reflectors, and the outgoing direction of the reflected light is changed to (w2, rn) by rotating the right-angle mirror set at this point, so that the beam passes through in sequence w1 to wm; the light source receiver, which is arranged on the point (wm, rn) of another matrix reflector, the light source passes through, and the light source receiver receives the light beam reflected by the right-angle reflector; the control platform collects the light source receiver The beam data of the motor vehicle exhaust puff is used for data analysis and calculation.

In some embodiments of the present disclosure, the value range of the number of dots q on the matrix reflective panel is 9<q<100; the value range of the number of columns is 3<w<10, and the value range of the number of rows is 3<r <10.

In some embodiments of the present disclosure, the rotation angle of the right-angle mirror is -90°˜90°.

In some embodiments of the present disclosure, the area of the matrix reflector is s, where 400cm2<s<800cm2; the height of the matrix reflector from the ground is h, where h>20cm.

In some embodiments of the present disclosure, the distance between each pair of matrix reflection plates is 1, where 1>30cm.

In some embodiments of the present disclosure, the light beam emitted by the light source emitter is infrared light/visible light/ultraviolet light.

In some embodiments of the present disclosure, the data analysis calculation of the control platform includes:

Superposition processing, respectively collect the absorption intensity at different time intervals under the same amount of time intervals, and calculate the gas emission concentration through the equi-column relationship.

In some embodiments of the present disclosure, the rectangular mirror is coated.

In some embodiments of the present disclosure, when the data acquisition interval of the detection device is 2 ms, the speed of the vehicle passes by 100 km/h, and the effective spectrum can be captured within the detection range through the interval of the distance 1>30 cm of the matrix reflector The number of absorption graphs is k, where k>2.

According to one aspect of the present disclosure, a method for detecting exhaust gas is provided, including the following steps: step a: take pictures of the detected vehicle through the camera, and then detect the driving speed of the detected vehicle through the speed measuring system; step b: detect the exhaust gas The device reads the meteorological data detected by the meteorological air station at this time; step c: turn on the exhaust gas detection device, and start recording and saving data since the detected vehicle enters the optical coverage of the right-angle reflector set on the matrix reflector plate, Stop data collection until the detected vehicle drives out of the optical coverage of the right-angle reflector set on the matrix reflector; step d: the control platform analyzes and calculates the data collected by the exhaust gas detection device to obtain the concentration of each pollutant discharge; and Compare with the national and industry standards to judge whether it meets the national and industry standards.

(3) Beneficial effects

It can be seen from the above technical solutions that the exhaust gas detection device and its method of the present disclosure have at least one or part of the following beneficial effects:

(1) The mirror group structure composed of multiple right-angle mirrors, multi-channel reflection is increased to a composite structure with both vertical plane internal reflection and horizontal plane internal reflection, which ensures that higher exhaust smoke can be obtained at higher vehicle speeds group capture rate.

(2) The matrix reflectors are arranged in pairs in parallel and facing each other. In the case of side wind and low wind speed, the capture rate of exhaust puffs can be guaranteed, and the device can cope with environmental interference factors.

(3) The height, area, and distance between the two plates of the matrix reflector meet the national standards for motor vehicle manufacturing. The reflective coverage formed by the matrix reflector can effectively capture the exhaust puff and avoid leakage caused by different models. Capture problems, resulting in measurement errors.

(4) Coating the right-angle reflector to increase the reflectivity of the reflector to a specific wavelength, so that the remaining light intensity after multiple reflections meets the requirements and prolongs the service life of the device.

Description of drawings

FIG. 1 is a schematic structural diagram of an exhaust gas detection device according to an embodiment of the present disclosure for detecting automobile exhaust.

FIG. 2 is a schematic diagram of an enlarged optical path of a light beam passing through a right-angle mirror in FIG. 1 according to an embodiment of the present disclosure.

[Description of main component symbols of the embodiment of the present disclosure in the accompanying drawings]

1-Light Emitter 2-Beam

3-Rectangular mirror 4-Matrix reflector

5-Detected vehicle 6-Light source receiver

Detailed ways

The disclosure provides an exhaust gas detection device and its method, including a light source transmitter, a right-angle reflector, a matrix reflector, a light source receiver, and a control platform; orderly arrange points on the matrix reflector and set a plurality of right-angle reflectors, Turn on the light source transmitter to emit light beams and reflect them to the light source receiver through the right-angle mirror, and perform data analysis and calculation on the light beam data collected by the light source receiver through the motor vehicle exhaust puff. Using the multi-dimensional and multi-path optical path, the multiple reflections in the horizontal and vertical directions make the measurement beam form a square light field matrix with a rectangular cross-section in space, and the motor vehicle can drive at a higher speed within the optical coverage area. In the beam coverage area, since the beam has a large increase in spatial height and width, the continuous capture capability is improved and the detection accuracy is high.

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

Certain embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which some but not all embodiments are shown. Indeed, various embodiments of the disclosure may be embodied in many different forms and should not be construed as limited to the embodiments set forth here; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements.

In an exemplary embodiment of the present disclosure, an exhaust gas detection device is provided. FIG. 1 is a schematic structural diagram of an exhaust gas detection device according to an embodiment of the present disclosure for detecting automobile exhaust. As shown in Figure 1, the disclosure includes a light source transmitter 1, a right-angle reflector 3, a matrix reflector 4, a light source receiver 6 and a control platform; the matrix reflectors 4 are arranged in pairs and parallel to each other; on each array reflector 4 The number of dots is q; the form of dots on each array reflector 4 is w*r, where w is the number of columns and r is the number of rows. The right-angle mirrors 3 are set on the distribution points of the matrix reflector 4; the number of the right-angle mirrors 3 is q', and the arrangement form of the right-angle mirrors 3 is m*n, wherein m is the number of columns, and n is the number of rows; q≥q' , w≥m, r≥n. The light source emitter 1 is arranged on a point (w ₁ , r ₁ ) of a matrix reflector 4, and the beam emitted by the light source emitter 1 is reflected to (w ₁ , r _n ), change the outgoing direction of the reflected light to (w ₂ , r _n ) by rotating the right-angle mirror 3 set at this point, so that the light beam passes through 1 column, 2 columns...m columns in sequence. The light source receiver 6 is arranged on the point (w _m , _rn ) of another matrix reflector 4 , and the light source receives the light beam reflected by the right-angle reflector 3 through the light source receiver 6 . The control platform performs data analysis and calculation on the light beam data collected by the light source receiver 6 and passed through the vehicle exhaust puff.

Regarding the setting of the area of the matrix reflective panel 4, considering the detection effect and economic benefits, it is recommended to set it within the range of ^400cm2 <s< ^800cm2 . For the same reason, the number of right-angle reflectors 3 on the matrix reflector 4 is also It is recommended to control it within the range of 9<p<100, the value range of the relative number of columns is 3<w<10, and the value range of the number of rows is 3<r<10. Here, the arrangement quantity of the right-angle reflector 3 on the matrix reflector 4 should comprehensively consider issues such as the area of the right-angle reflector 3 and the area of the matrix reflector 4 . The rotation angle of the right-angle mirror 3 can be -90° to 90°, preferably ±90°.

The distance between the height of the matrix reflector 4 and the ground is h, and it is recommended to set it within the range of h > 20cm. According to statistics, the height of the exhaust pipes of domestic ordinary car models and small truck models is basically between 20cm and 35cm from the ground. According to this precondition, it is suggested that the height of the matrix reflector 4 be set at a position not higher than 20 cm, so as to be able to cover all the puffs emitted by automobile exhaust. Based on the same consideration, the distance between each pair of matrix reflectors 4 is suggested to be in the range of 1>30 cm.

Superimposed processing, respectively collect the absorption intensity at different times under the time interval when the lights are on, and calculate the gas emission concentration through the equi-column relationship. In order to improve the effective capture rate of exhaust puff and improve the detection accuracy.

The above settings are mainly to enable the detection device to obtain a higher capture rate even if the detected motor vehicle passes the detection device at a higher speed, so as to ensure the detection accuracy. Take a specific detection data as an example: when the data acquisition interval of the detection device is 2ms, the speed of the vehicle passes by 100km/h, and the effective spectrum can be captured within the detection range after passing through the interval of the distance 1>30cm of the matrix reflector 4 The number of absorption graphs is k, where k>2. It can be seen that the exhaust detection device provided by the present disclosure can still obtain a relatively high capture rate through the detection device even when the vehicle speed is 100 km/h.

In an exemplary embodiment of the present disclosure, a method for detecting exhaust gas is also provided, which specifically includes the following steps: Step a: take pictures of the detected vehicle through the camera, and then detect the driving speed of the detected vehicle through the speed measuring system Step b: the exhaust gas detection device reads the meteorological data detected by the meteorological air station at this time; step c: the exhaust gas detection device is turned on, and the detected vehicle enters the optical coverage of the right-angle reflector 3 provided on the matrix reflector 4 From within, start recording and saving data until the detected vehicle drives out of the optical coverage of the right-angle reflector 3 set on the matrix reflector 4, and stop data collection; Step d: The control platform analyzes and calculates the data collected by the exhaust gas detection device , to obtain the concentration of each pollutant discharge; and compare it with the national and industrial standards to judge whether it meets the national and industrial standards.

Taking a specific test as an example as a reference, for an ordinary family car with a body length of 4.5m, the exhaust pipe discharge height of the car is 30cm above the ground. When the car enters the exhaust gas detection device, the camera is used to take pictures of the detected vehicle, and then the speed of the detected vehicle is detected through the speed measuring system. The exhaust gas detection device reads the meteorological data detected by the meteorological air station at this time, such as parameters such as temperature, humidity, atmospheric pressure, wind direction, and wind speed. Turn on the exhaust gas detection device, and start recording and saving data since the detected vehicle drives into the optical coverage of the right-angle reflector 3 set on the matrix reflector 4 until the detected vehicle drives out of the right-angle reflector set on the matrix reflector 4 3 for optical coverage, stop data acquisition. The control platform analyzes and calculates the data collected by the exhaust gas detection device to obtain the concentration of each pollutant discharge; and compares it with the national and industrial standards to judge whether it meets the national and industrial standards.

The technical difficulty of the present invention lies in the arrangement position and placement angle of multiple right-angle reflectors. These problems need to be adjusted by professional optical workers before leaving the factory, and only simple position adjustment is required when they are fixed and used on site. For the loss problem on the way of beam reflection, it is possible to increase the luminous power of the light source by selecting a high-power light source; coating the right-angle reflector 3 to improve the reflectivity of the right-angle reflector group; increase zero-point reference debugging; post-stage platform Data superposition and data processing methods to solve the problem. Among them, the zero-point benchmark debugging method is to calculate the benchmark value of the average air concentration in a certain place when no motor vehicles pass through the mobile vehicle exhaust space matrix telemetry monitoring system through hourly data integration and camera monitoring. The air concentration value at that time is obtained by decrement calculation.

So far, the exhaust gas detection device and its method according to an embodiment of the present disclosure have been introduced.

So far, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that, in the accompanying drawings or in the text of the specification, implementations that are not shown or described are forms known to those of ordinary skill in the art, and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and those of ordinary skill in the art can easily modify or replace them, for example:

The right-angle reflector 3 can be replaced by a corner cube or a right-angle reflector.

Based on the above description, those skilled in the art should have a clear understanding of the exhaust gas detection device and its method of the present disclosure.

To sum up, the present disclosure provides an exhaust gas detection device and its method, using multi-dimensional and multi-optical paths, multiple reflections in the horizontal and vertical directions to make the measurement beam form a light field with a rectangular cross-section in space In the square array, motor vehicles can drive through the beam coverage area at a relatively high speed within the optical coverage area. Since the beam has a large increase in spatial height and width, the continuous capture capability is improved and the detection accuracy is high.

It should also be noted that the directional terms mentioned in the embodiments, such as "up", "down", "front", "back", "left", "right", etc., are only referring to the directions of the drawings, not Used to limit the protection scope of this disclosure. Throughout the drawings, the same elements are indicated by the same or similar reference numerals. Conventional structures or constructions are omitted when they may obscure the understanding of the present disclosure.

And the shape and size of each component in the figure do not reflect the actual size and proportion, but only illustrate the content of the embodiment of the present disclosure. Furthermore, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.

Unless known to the contrary, the numerical parameters set forth in the specification and attached claims are approximations that can vary depending upon the desired properties obtained from the teachings of the present disclosure. Specifically, all numbers used in the specification and claims to represent the content of components, reaction conditions, etc. should be understood to be modified by the term "about" in all cases. In general, the expressed meaning is meant to include a variation of ±10% in some embodiments, a variation of ±5% in some embodiments, a variation of ±1% in some embodiments, a variation of ±1% in some embodiments, and a variation of ±1% in some embodiments ±0.5% variation in the example.

Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

Words such as "first", "second", "third" and the like used in the description and claims to modify the corresponding elements do not in themselves mean that the elements have any ordinal numbers, nor The use of these ordinal numbers to represent the sequence of an element with respect to another element, or the order of manufacturing methods, is only used to clearly distinguish one element with a certain designation from another element with the same designation.

In addition, unless specifically described or steps that must occur sequentially, the order of the above steps is not limited to that listed above and may be changed or rearranged according to the desired design. Moreover, the above-mentioned embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, technical features in different embodiments can be freely combined to form more embodiments.

The algorithms and displays presented herein are not inherently related to any particular computer, virtual system, or other device. Various general systems can also be used with the teachings based on this. The structure required to construct such a system is apparent from the above description. Furthermore, this disclosure is not directed to any particular programming language. It should be understood that various programming languages can be used to implement the content of the present disclosure described herein, and the above description of specific languages is for disclosing the best mode of the present disclosure.

The disclosure can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. The various component embodiments of the present disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art should understand that a microprocessor or a digital signal processor (DSP) may be used in practice to implement some or all functions of some or all components in related devices according to the embodiments of the present disclosure. The present disclosure can also be implemented as an apparatus or apparatus program (eg, computer program and computer program product) for performing a part or all of the methods described herein. Such a program realizing the present disclosure may be stored on a computer-readable medium, or may have the form of one or more signals. Such a signal may be downloaded from an Internet site, or provided on a carrier signal, or provided in any other form.

Similarly, it should be appreciated that in the above description of exemplary embodiments of the disclosure, in order to streamline the disclosure and to facilitate an understanding of one or more of the various disclosed aspects, various features of the disclosure are sometimes grouped together into a single embodiment, figure, or its description. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, disclosed aspects lie in less than all features of a single foregoing disclosed embodiment. Thus the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment of this disclosure.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present disclosure in detail. It should be understood that the above descriptions are only specific embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included within the protection scope of the present disclosure.

Claims (10)

1. a kind of Tail gas measuring device, including：

Matrix reflecting plate, the matrix reflecting plate is pairs of and is oppositely arranged in parallel；Cloth points on each array reflecting plate Amount is q；Arrangement form on each array reflecting plate is w*r, and wherein w is number of columns, and r is line number amount；

Corner cube mirror, layout upper setting of the corner cube mirror in the matrix reflecting plate；The corner cube mirror quantity Laying form for q ', the corner cube mirror is m*n, and wherein m is number of columns, and n is line number amount；Q >=the q ', w >=m, r >= n；

Point (the w in a matrix reflecting plate is arranged in light source emitter₁, r₁) on, the light source emitter emits light beam by setting The corner cube mirror set on the two matrix reflecting plates reflexes to (w₁, r_n), by rotating the described straight of the site setting Corner reflector changes the exit direction of reflected light to (w₂, r_n), so that the light beam is sequentially passed through w₁To w_m；

Point (the w in another matrix reflecting plate is arranged in light source receiver_m, r_n) on, the light source passes through, the light source receiver Receive the light beam reflected by the corner cube mirror；And

Control platform, the beam data for having passed through motor-vehicle tail-gas cigarette group collected to the light source receiver carry out data point Analysis and calculating.

2. Tail gas measuring device according to claim 1, the value range for the quantity q that layouts on the matrix Reflector Panel is 9 ＜ q ＜ 100；The value range of the number of columns is 3 ＜ w ＜ 10, and the value range of the line number amount is 3 ＜ r ＜ 10.

3. the rotation angle of Tail gas measuring device according to claim 1, the corner cube mirror is -90 °~90 °.

4. the area of Tail gas measuring device according to claim 1, the matrix reflecting plate is s, wherein 400cm²＜ s ＜ 800cm²；The height of the matrix reflecting plate away from ground is h, wherein h ＞ 20cm.

5. the spacing of Tail gas measuring device according to claim 1, each pair of matrix reflecting plate is 1, wherein 1 ＞ 30cm。

6. Tail gas measuring device according to claim 1, the transmitting light beam of the light source emitter is infrared light/visible Light/ultraviolet light.

7. the data analysis calculating of Tail gas measuring device according to claim 1, the control platform includes：

Overlap-add procedure is acquired respectively under the time interval of equivalent, the absorption intensity of different moments, and gas is calculated by equal row relationship Body concentration of emission.

8. Tail gas measuring device according to claim 1 carries out coating film treatment to the corner cube mirror.

9. Tail gas measuring device according to claim 1, when the data acquisition intervals of detection device are 2ms, speed exists Pass through in the case of 100km/h, by the section of the 1 ＞ 30cm of spacing of the matrix reflecting plate, can be captured in detection range It is k, wherein k ＞ 2 to effective spectral absorption figure number.

10. a kind of Tail gas measuring method, includes the following steps：

Step a：It is taken pictures by camera to being detected vehicle, then by velocity-measuring system to the travel speed of detected vehicle It is detected；

Step b：Tail gas measuring device reads the meteorological data that meteorological air station at this time detects；

Step c：Tail gas measuring device is opened, the right angle reflection being arranged on the matrix reflecting plate is driven into from vehicle is detected It is risen in the optics coverage area of mirror, start recording preserves data, is arranged until being detected vehicle and being driven out on the matrix reflecting plate The corner cube mirror optics coverage area, stop data acquisition；And

Step d：The control platform carries out analysis calculating to the collected data of Tail gas measuring device, obtains each pollutant effulent Concentration；And compared with country and professional standard, to judge whether to meet country and professional standard.