Adjusting device of particulate matter measuring system

Abstract

The utility model provides an adjusting device of a particulate matter measuring system. The adjusting device comprises a light source assembly, a conical lens, a measuring chamber, a light receiving assembly and a dimming device, the light source assembly is used for emitting parallel light, the conical lens converts the parallel light into a conical annular light beam, smoke particles are introduced into the measuring chamber, the annular light beam passes through a two-phase flow containing the smoke particles and acts with the particles to generate scattered light, and the scattered light generated by the particles in the annular measuring area is received by the light receiving assembly; the concentration sensor is used for obtaining concentration of particles; the dimming device is used for calibration; pure gas without particulate matter is filled in the measuring area, the annular light beam does not generate scattered light, and after part of light of the axis light beam is blocked by the dimming device, the axis light beam is received by the light receiving assembly and used for cross-point calibration. The adjusting device of the particulate matter measuring system has the obvious advantages of simplifying the calibration process, improving the calibration precision, enhancing the system flexibility, optimizing the structural design and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the calibration technical field of particulate matter measuring system, concretely relates to a kind of particulate matter measuring system's adjusting device. BACKGROUND

[0002] Particulate matter measuring system is usually used to detect the concentration of particulate matter in the air to assess air quality or particulate emission in industrial production process, and the existing particulate matter measuring system mostly uses laser scattering method to measure the concentration of particulate matter, which relies on the scattered light intensity generated after the interaction of the light beam emitted by the light source and the particulate matter to measure.

[0003] The traditional particulate matter measuring system mainly includes light source, measuring chamber and light receiver and several main components, wherein the light beam emitted by the light source needs to be uniformly and stably irradiated on the particulate matter to be measured, and the light receiver is responsible for collecting scattered light and converting it into analyzable data signal, however, in actual application, in order to ensure the accuracy of measurement results, the system needs to be calibrated regularly to eliminate the influence of equipment aging, environmental change and other factors.

[0004] Disadvantages of prior art:

[0005] 1. Inconvenient calibration: the traditional calibration method usually needs external standard substance to complete, which not only increases the complexity of operation, but also is difficult to ensure the consistency and accuracy of each calibration.

[0006] 2. Complex structure: in order to improve the measurement accuracy, the existing system is often designed to be relatively complex, which increases the cost and makes the maintenance relatively difficult.

[0007] 3. Poor flexibility: for the measurement of particulate matter with different concentration ranges, the existing system may need to frequently replace equipment or adjust parameters, which reduces the flexibility and adaptability of the system.

[0008] 4. Difficulty in signal processing: due to the large range of particulate matter concentration, how to accurately obtain the scattered light signal under different concentrations and calculate the concentration of particulate matter according to the scattered light signal is a challenge.

[0009] Therefore, the prior art has deficiencies and needs to be further improved. INVENTION CONTENTS

[0010] In view of the problems existing in the prior art, the utility model provides a kind of particulate matter measuring system's adjusting device.

[0011] To achieve the above purpose, the specific scheme of the utility model is as follows:

[0012] The utility model provides a kind of particulate matter measuring system's adjusting device, comprising:

[0013] a light source assembly, a conic lens, a measuring chamber, a light receiving assembly, a light adjusting device;

[0014] The conic lens, the measuring chamber and the light receiving assembly are sequentially arranged in front of the light source assembly.

[0015] The light source assembly is used for emitting parallel light, the conic lens converts the parallel light into a ring-shaped light beam with a cross section of a ring shape and a longitudinal section of a conic shape, the ring-shaped light beam forms a ring-shaped measuring area in the measuring chamber, the ring-shaped light beam passes through a two-phase flow containing smoke particles, interacts with the particles to generate scattered light, and the scattered light generated by the particles in the ring-shaped measuring area is received by the light receiving assembly to obtain the concentration of the particles.

[0016] The conic lens is provided with a flat surface at the top of the conic angle, the parallel light is incident on the conic surface of the conic lens to form a ring-shaped light beam, and an axial light beam is formed through the flat surface.

[0017] The ring-shaped measuring area is further provided with a light adjusting device for calibration.

[0018] In the calibration state, the measuring area is filled with pure gas without particles, the ring-shaped light beam does not generate scattered light and is absorbed by the measuring chamber, and the axial light beam is partially blocked by the light adjusting device and then gathered by the light receiving assembly for range scattered light signal cross-point calibration.

[0019] The light adjusting device is used for adjusting the intensity of the axial light beam by changing the area of the light blocking, achieving the purpose of simulating a specific amount of scattered signal, realizing the pickup of the range signal and further realizing the calibration function.

[0020] Further, the top of the conic angle of the conic lens is further provided with a spherical surface or a through hole.

[0021] The parallel light is incident on the conic surface of the conic lens to form a ring-shaped light beam, and an axial light beam is formed through the spherical surface or the through hole.

[0022] Further, a light limiting diaphragm is arranged in front of the ring-shaped measuring area of the conic lens.

[0023] Further, a light blocking device is arranged in front of the light limiting diaphragm in the ring-shaped measuring area.

[0024] Further, the light adjusting device includes a cylindrical portion and a tapered portion, and different blocking areas are generated by changing the bias angle of the light adjusting device.

[0025] Further, a filter is arranged between the light adjusting device and the light receiving assembly.

[0026] By replacing the filter with different absorption rates, different span signals can be picked up, and further span calibration and linear calibration functions can be realized.

[0027] The technical scheme of the utility model has the following beneficial effects:

[0028] 1. Simplify the calibration process:

[0029] The device integrates a light adjusting device inside, which simulates the scattered light signals generated by different concentrations of particulate matters by changing the light blocking area, thereby realizing the pickup and calibration of the range signal. This design avoids the trouble of using external standard substances for calibration, making the calibration process simpler and more convenient.

[0030] 2. Improve calibration accuracy:

[0031] During calibration, the degree of blocking of the axial light beam by the light adjusting device can be controlled to accurately simulate the scattered light intensity corresponding to different concentrations of particulate matters, thereby improving the accuracy of calibration. This design ensures the consistency and accuracy of each calibration.

[0032] 3. Enhance system flexibility:

[0033] The device can pick up different span signals by replacing filters with different absorption rates, which enhances the adaptability of the system to different concentration ranges of particulate matter measurement, allowing the device to maintain good performance in various working environments.

[0034] 4. Optimize structural design:

[0035] The design of the conical lens converts parallel light into a ring-shaped light beam, and a flat surface, a spherical surface or a through hole is provided at the top of the cone angle to form an axial light beam. This design effectively improves the utilization rate of the light beam, reduces unnecessary light loss, and simplifies the system structure.

[0036] 5. Easy to maintain and adjust:

[0037] By setting a light limiting diaphragm and a light blocking device in front of the conical lens, the shape and intensity of the light beam entering the measurement area can be better controlled, making the maintenance of the entire system easier. In addition, the structural design of the light adjusting device allows the blocking area to be changed by adjusting the bias angle, making the adjustment of the system more flexible. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a structural schematic diagram of the utility model;

[0039] Figure 2 is a schematic diagram of the conical lens and the flat surface provided at the top of the cone angle of the utility model;

[0040] Figure 3is a schematic view of the conical lens and the through hole arranged in the middle of the utility model;

[0041] Figure 4 is a sectional view of the light limiting diaphragm of the utility model;

[0042] Figure 5 is a schematic view of the light adjusting device of the utility model.

[0043] In the drawing:

[0044] 1, light source assembly; 2, conical lens; 201, plane; 202, through hole; 3, measuring chamber; 4, smoke dust particle; 5, annular measuring area; 6, light receiving assembly; 7, light adjusting device; 701, light blocking area adjusting area; 8, light blocking device; 9, light limiting diaphragm; 10, optical filter. DETAILED DESCRIPTION

[0045] The utility model will be further explained in detail in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0046] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0047] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0048] In the description of the present embodiment, the terms "upper", "lower", "front", "back", "left", "right" and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0049] In combination Figures 1-5 As shown in the utility model provides a kind of calibration device of particulate matter measuring system, comprising: light source component 1, cone lens 2, measuring chamber 3, light receiving component 6, light adjusting device 7;

[0050] The cone lens 2, measuring chamber 3, light receiving component 6 are sequentially arranged on the front side of the light source component 1;

[0051] The light source component 1 is used to emit parallel light, and the cone lens 2 converts the parallel light into a ring-shaped light beam with a transverse section of a ring shape and a longitudinal section of a cone shape. The ring-shaped light beam forms a ring-shaped measurement area 5 in the measuring chamber 3. The measuring chamber 3 is connected to smoke particles 4. The ring-shaped light beam passes through the two-phase flow containing the smoke particles 4 and interacts with the particulate matter to generate scattered light. The scattered light generated by the particulate matter in the ring-shaped measurement area 5 is received by the light receiving component 6 to obtain the concentration of the particulate matter.

[0052] The cone angle top end of the cone lens 2 is provided with a flat surface 201. The parallel light is incident on the cone surface part of the cone lens 2 to form a ring-shaped light beam. The axial light beam is formed by the flat surface 201 part.

[0053] The ring-shaped measurement area 5 is also provided with a light adjusting device 7 for calibration.

[0054] In the calibration state, the measurement area is filled with pure gas without particulate matter. The ring-shaped light beam does not generate scattered light and is absorbed by the measuring chamber 3 cavity. The axial light beam is partially blocked by the light adjusting device 7 and is then converged by the light receiving component 6 to calibrate the range scattered light signal cross point.

[0055] The light adjusting device 7 is used to adjust the intensity of the axial light beam by changing the area of the light blocking to achieve the purpose of simulating a specific amount of scattered signal, pick up the range signal and further realize the calibration function.

[0056] The cone angle top end of the cone lens 2 is also provided with a spherical surface or a through hole 202.

[0057] The parallel light is incident on the cone surface part of the cone lens 2 to form a ring-shaped light beam. The axial light beam is formed by the spherical surface or the through hole 202 part.

[0058] A light limiting diaphragm 9 is arranged in front of the conical lens 2 in the annular measuring area 5.

[0059] A light blocking device 8 is arranged in front of the light limiting diaphragm 9 in the annular measuring area 5.

[0060] The light adjusting device 7 comprises a cylindrical portion and a tapered portion, and different blocking areas are generated by changing the bias angle of the light adjusting device 7.

[0061] A filter 10 is further arranged between the light adjusting device 7 and the light receiving assembly 6.

[0062] By replacing the filter 10 with different absorption rates, different span signals can be picked up, and span calibration and linear calibration functions can be further realized.

[0063] The principle of the utility model is as follows:

[0064] The measuring principle is as follows:

[0065] Light source emission: the light source assembly 1 emits parallel light, and the parallel light enters the conical lens 2.

[0066] Beam conversion: the conical lens 2 converts the parallel light into an annular beam with a ring-shaped transverse section and a conical longitudinal section. The top end of the conical angle of the conical lens 2 is provided with a plane 201, a spherical surface or a through hole 202, part of the light forms an annular beam through the conical surface portion, and the other part of the light forms an axial beam through the plane 201, the spherical surface or the through hole 202.

[0067] Particle scattering: the annular beam passes through the two-phase flow containing smoke particles 4 in the measuring chamber 3, and the particles scatter the light in the annular beam. The scattered light is captured by the light receiving assembly 6.

[0068] Concentration calculation: the scattered light received by the light receiving assembly 6 is converted into an electrical signal, and the concentration of the particles is obtained through a solving algorithm.

[0069] Calibration principle:

[0070] Calibration preparation: in the calibration mode, the measuring chamber 3 is filled with pure gas without particles, and at this time, the annular beam does not produce scattered light.

[0071] Axial beam adjustment: the axial beam is blocked by the light blocking device 8 after passing through the light limiting diaphragm 9, so as to prevent background light from interfering with the measurement. In the calibration state, the light blocking device 8 is removed.

[0072] Light adjusting device 7 adjustment: the axial beam continues to advance and passes through the light adjusting device 7, the light adjusting device 7 comprises a cylindrical portion and a tapered portion, and the intensity of the axial beam is adjusted by changing the bias angle of the light adjusting device 7, so as to simulate different scattered light signal intensities.

[0073] Range calibration: the adjusted axial light beam of the light adjusting device 7 is received by the light receiving assembly 6 for cross-point calibration of the range scattered light signal. By changing the light blocking area, different intensity scattered light signals can be simulated, thereby realizing the range signal pickup and calibration of the system.

[0074] Filter 10 auxiliary calibration: a filter 10 is arranged between the light adjusting device 7 and the light receiving assembly 6. By replacing the filter 10 with different absorption rates, different span signals can be picked up, and further span calibration and linear calibration functions can be realized.

[0075] Summary: The calibration device of the particulate matter measuring system realizes accurate measurement and simple calibration of particulate matter concentration by skillfully utilizing the design of the conical lens 2 and the light adjusting device 7. In the calibration process, the intensity of the axial light beam can be adjusted by the light adjusting device 7, and the application of the filter 10 further improves the calibration accuracy and flexibility of the system. This design not only simplifies the calibration process, but also improves the reliability and measurement accuracy of the system.

[0076] The above is only the preferred embodiment of the present application, and does not limit the scope of the application. Any equivalent structural transformation or direct / indirect application in other related technical fields within the scope of the application is included in the protection scope of the application.

Claims

1. A calibration device for a particulate matter measurement system, characterized in that, include: Light source assembly, conical lens, measuring chamber, light receiving assembly, dimming device; The conical lens, the measuring chamber, and the light receiving component are arranged sequentially on the front side of the light source component; The light source assembly is used to emit parallel light. The conical lens converts the parallel light into a ring beam with a circular cross-section and a conical longitudinal section. The ring beam forms a ring measurement area in the measurement chamber. Smoke particles are introduced into the measurement chamber. The ring beam passes through a two-phase flow containing smoke particles and interacts with the particles to generate scattered light. The scattered light generated by the particles in the ring measurement area is received by the light receiving assembly to determine the concentration of the particles. The cone lens has a flat surface at the top of its cone angle. Parallel light incident on the cone surface of the cone lens forms an annular beam, while light passing through the flat surface forms an axial beam. The annular measurement area is also equipped with a dimming device for calibration; During calibration, the measurement area is filled with pure gas free of particulate matter. The ring beam does not produce scattered light and is absorbed by the measurement chamber. The axial beam is partially blocked by the dimming device and then focused by the light receiving component for cross-point calibration of the range scattered light signal. The dimming device is used to adjust the intensity of the axial beam by changing the area of ​​the light blocking, so as to simulate a specific amount of scattered signal, pick up the range signal, and further realize the calibration function.

2. The calibration device for the particulate matter measurement system according to claim 1, characterized in that, The cone lens is further provided with a spherical surface or a through hole at the cone tip; Parallel light incident on the conical surface of a conical lens forms a ring beam, while light passing through the spherical or through-hole portion forms an axial beam.

3. The calibration device for the particulate matter measurement system according to claim 1, characterized in that, A light-limiting aperture is also provided in front of the conical lens in the annular measurement area.

4. The calibration device for the particulate matter measurement system according to claim 3, characterized in that, A light-blocking device is also installed in front of the light-limiting aperture in the annular measurement area.

5. The calibration device for the particulate matter measurement system according to claim 4, characterized in that, The dimming device includes a cylindrical part and a tapered part. The tapered part is provided with a light-blocking area adjustment zone, and different blocking areas are generated by changing the offset angle of the dimming device.

6. The calibration device for the particulate matter measurement system according to claim 4, characterized in that, A filter is also provided between the dimming device and the light receiving component; By replacing filters with different absorption rates, signals of different spans can be picked up, and span calibration and linear calibration functions can be further realized.

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