Measuring light path system of dust concentration measuring device

Abstract

The utility model relates to a measuring light path system of a dust concentration measuring device, which comprises a measuring chamber used for measuring the dust concentration of flue gas; the light source generating part is used for emitting light beams; the light beam splitting component is used for splitting the light beam into a measurement light beam and a calibration light beam; the reflecting mirror is used for reflecting the calibration light beam; the light path switching baffle is used for shielding the measurement light beam or the calibration light beam; and the light beam collection module comprises a first collection part and a second collection part, the first collection part is used for collecting scattered light beams or calibration light beams after the measurement light beams are scattered, and the second collection part is used for collecting light beams which are not scattered by the measurement light beams. In the measurement state, scattered light beams obtained after scattering of the measurement light beams and dust particles are collected by the first collection part, and the concentration of dust can be calculated by measuring the intensity of the scattered light; the second collecting part is used for collecting light beams which are not scattered; in the calibration state, the calibration light beam is received by the first collection component and is used for correcting the signal of the measurement light beam.

Description

Technical Field

[0001] This utility model relates to the field of dust concentration measurement technology, and in particular to a measurement optical path system for a dust concentration measurement device. Background Technology

[0002] The light scattering dust concentration measurement method is a specialized detection instrument widely used in environmental monitoring, industrial production, scientific research experiments, homes and public places, and medical and health fields. Its working principle is based on the principle of light scattering. When particulate matter in a gas passes through a laser beam, it scatters light. The intensity of this scattered light is detected by a photoelectric sensor, thereby calculating the dust concentration.

[0003] However, after prolonged use, existing light-scattering dust concentration measurement devices may experience reduced luminous efficiency due to aging of the laser light source, thus affecting the light source intensity; or fluctuations in the power supply may also lead to instability in the light source intensity. For example, voltage fluctuations and current instability can both affect the luminous intensity of the light source. Because the light source intensity is prone to change, measurement results are easily deviated. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a measuring optical path system for a dust concentration measuring device, which solves the problem that the light source intensity of existing light scattering dust concentration measuring devices is prone to change, leading to deviations in the measurement results.

[0005] To achieve the above and other related objectives, this utility model provides a measuring optical path system for a dust concentration measuring device, including an inlet pipe and an exhaust pipe. The inlet pipe is used to introduce flue gas from the flue into the device, and the exhaust pipe is used to discharge the flue gas from the device.

[0006] The measuring chamber is connected to the air inlet pipe and the exhaust pipe. The measuring chamber is provided with a measuring area, which is used for measuring the dust concentration in the flue gas.

[0007] A light source generating component is used to emit a light beam that is scattered by the flue gas dust particles in the measurement area;

[0008] A beam splitting component is used to split the beam emitted by the light source generating component into a measurement beam and a calibration beam;

[0009] A reflector is used to reflect the calibration beam so that the calibration beam is parallel to the measurement beam;

[0010] An optical path switching baffle is used to block the measurement beam or the calibration beam;

[0011] A beam collecting module includes a first collecting component and a second collecting component. The first collecting component is used to collect the scattered beam or the calibration beam after the measurement beam passes through the measurement area and is scattered by dust particles. The second collecting component is used to collect the beam that is not scattered after the measurement beam passes through the measurement area.

[0012] Optionally, the light source generating component is a laser diode.

[0013] Optionally, the beam splitting component includes a base and a beam splitter prism. The base includes an input light channel, a first output light channel, and a second output light channel. The beam splitter prism is located at the intersection of the input light channel, the first output light channel, and the second output light channel. The beam splitter prism is used to split the light beam emitted by the light source generating component into a measurement beam and a calibration beam. The first output light channel is used for the measurement beam to output light, and the second output light channel is used for the calibration beam to output light.

[0014] Optionally, the first light-emitting channel is coaxial with the light-incoming channel, and the second light-emitting channel is perpendicular to the first light-emitting channel.

[0015] Optionally, it also includes a driving component connected to the optical path switching baffle. The driving component is used to drive the optical path switching baffle to flip so as to block the first light output channel or the second light output channel.

[0016] Optionally, the measuring chamber includes a flue gas chamber and a first air curtain chamber and a second air curtain chamber disposed at both ends of the flue gas chamber along the axial direction. The flue gas chamber is connected to the air inlet pipe and the exhaust pipe. The first air curtain chamber is connected to the air source, and the second air curtain chamber is connected to the first air curtain chamber.

[0017] Optionally, the flue gas chamber is provided with an air passage connecting the first air curtain chamber and the second air curtain chamber.

[0018] Optionally, the beam collecting module is disposed within the second air curtain cavity.

[0019] Optionally, the beam collecting module further includes a converging lens for converging scattered beams or calibrating beams.

[0020] Optionally, the first collecting component is an optical fiber, and the second collecting component is an optical trap.

[0021] As described above, this utility model has the following beneficial effects: the beam emitted by the light source generating component is divided into a measurement beam and a calibration beam by the beam splitting component, and the calibration beam is made parallel to the measurement beam by the reflector, avoiding measurement errors introduced by different beam paths; in the measurement state, the optical path switching baffle blocks the calibration beam, and only the measurement beam passes through the measurement area. The scattered beam after the measurement beam is scattered by the dust particles is collected by the first collecting component. By measuring the intensity of the scattered light, the dust concentration can be calculated; the beam that has not been scattered is collected by the second collecting component; by blocking the measurement beam by the optical path switching baffle, the calibration beam is received by the first collecting component. The calibration beam compensates for changes in light source intensity, ambient light interference, and other factors, corrects the signal of the measurement beam, and ensures the accuracy of the measurement results. Attached Figure Description

[0022] Figure 1 The diagram shown is a cross-sectional structural schematic of the measuring optical path system of the dust concentration measuring device shown in an embodiment of this application.

[0023] Figure 2 The diagram shown is a cross-sectional view of the beam splitting component as illustrated in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures

[0025] Measurement chamber 1, flue gas chamber 101, measurement area 101a, air duct 101b, first air curtain cavity 102, second air curtain cavity 103, light source generating component 2, beam splitting component 3, base 301, light inlet channel 301a, first light outlet channel 301b, second light outlet channel 301c, beam splitter prism 302, reflector 4, optical path switching baffle 5, beam collecting module 6, first collecting component 601, second collecting component 602, converging lens 603. Detailed Implementation

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0027] Please see Figures 1 to 2It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes and to assist those skilled in the art in understanding and reading the content disclosed in the specification. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0028] Before describing the embodiments of this utility model in detail, the application environment of this utility model will be described first. The technology of this utility model is mainly applied to the field of dust concentration measurement technology. This utility model is used to solve the problem that the light source intensity of existing light scattering dust concentration measuring devices is prone to change, leading to deviations in the measurement results.

[0029] Please combine Figures 1 to 2 As shown, this utility model provides a measuring optical path system for a dust concentration measuring device.

[0030] In an exemplary embodiment of this application, the measuring optical path system of the dust concentration measuring device includes an inlet pipe and an exhaust pipe. The inlet pipe is used to introduce flue gas from the flue into the device, and the exhaust pipe is used to discharge the flue gas from the device.

[0031] Measurement chamber 1 is connected to the air inlet pipe and the exhaust pipe. Measurement chamber 1 is provided with a measurement area 101a, which is used for measuring the concentration of dust in flue gas.

[0032] The light source generating component 2 is used to emit a light beam that is scattered by the flue gas dust particles in the measurement area 101a;

[0033] The beam splitting component 3 is used to split the beam emitted by the light source generating component 2 into a measurement beam and a calibration beam;

[0034] Reflector 4 is used to reflect the calibration beam so that the calibration beam is parallel to the measurement beam;

[0035] Optical path switching baffle 5 is used to block the measurement beam or calibration beam;

[0036] The beam collection module 6 includes a first collection component 601 and a second collection component 602. The first collection component 601 is used to collect the scattered beam or calibration beam after the measurement beam passes through the measurement area 101a and is scattered by dust particles. The second collection component 602 is used to collect the beam that is not scattered after the measurement beam passes through the measurement area 101a.

[0037] In this embodiment, the beam emitted by the light source generating unit 2 is divided into a measurement beam and a calibration beam by the beam splitting component 3. The calibration beam is parallel to the measurement beam by the reflector 4 to avoid measurement errors caused by different beam paths. In the measurement state, the optical path switching baffle 5 blocks the calibration beam, and only the measurement beam passes through the measurement area 101a. The scattered beam after the measurement beam is scattered by the dust particles is collected by the first collecting component 601. By measuring the intensity of the scattered light, the dust concentration can be calculated. The beam that has not been scattered is collected by the second collecting component 602. By blocking the measurement beam with the optical path switching baffle 5, the calibration beam is received by the first collecting component 601. The calibration beam compensates for changes in light source intensity, ambient light interference, and other factors, corrects the signal of the measurement beam, and ensures the accuracy of the measurement results.

[0038] It is worth noting that the calibration beam does not scatter and is directly received by the first collecting component 601, which can be used to monitor real-time changes in the light source intensity. When the light source intensity changes, both the measuring beam and the calibration beam will be affected. However, since the calibration beam does not scatter and is directly received by the first collecting component 601, the intensity of the light it receives directly reflects the change in the light source intensity. By comparing the intensity of the light received by the calibration beam with a preset standard value or initial value, the change in the light source intensity can be calculated. The resulting change can be used to adjust or correct the intensity of the scattered light received by the measuring beam, thereby eliminating the influence of changes in light source intensity on the measurement results.

[0039] In an exemplary embodiment of this application, the light source generating component 2 is a laser diode.

[0040] In this embodiment, the light source generating component 2 shown in this application includes, but is not limited to, a 6.5nm laser diode. The laser diode can provide a stable and intensity-controllable beam, which is suitable for precise optical measurement.

[0041] In an exemplary embodiment of this application, the beam splitting component 3 includes a base 301 and a beam splitter 302. The base 301 includes an input light channel 301a, a first output light channel 301b, and a second output light channel 301c. The beam splitter 302 is located at the intersection of the input light channel 301a, the first output light channel 301b, and the second output light channel 301c. The beam splitter 302 is used to split the light beam emitted by the light source generating component 2 into a measurement beam and a calibration beam. The first output light channel 301b is used for the measurement beam to emit light, and the second output light channel 301c is used for the calibration beam to emit light.

[0042] In this embodiment, the beam splitter 302 splits the light beam emitted by the light source generating component 2 into two laser beams of equal size in terms of intensity. These beams are emitted through the first light output channel 301b and the second light output channel 301c, respectively, to form a measurement beam and a calibration beam.

[0043] In an exemplary embodiment of this application, the first light-emitting channel 301b is coaxial with the light-incoming channel 301a, and the second light-emitting channel 301c is perpendicular to the first light-emitting channel 301b.

[0044] In this embodiment, the reflector is located directly above the beam splitting component 3. The second light output channel 301c is perpendicular to the first light output channel 301b, so that the split calibration beam can be perpendicularly irradiated onto the reflector. The reflector adjusts the calibration beam to be parallel to the measurement beam.

[0045] In an exemplary embodiment of this application, a driving component is also included. The driving component is connected to the optical path switching baffle 5 and is used to drive the optical path switching baffle 5 to flip so as to block the first light output channel 301b or the second light output channel 301c.

[0046] In this embodiment, the driving component includes, but is not limited to, a motor. The driving component drives the optical path switching baffle 5 to rotate so that the optical path switching baffle 5 blocks the first light output channel 301b or the second light output channel 301c. The optical path switching baffle 5 can rotate 270°.

[0047] In an exemplary embodiment of this application, the measuring chamber 1 includes a flue gas chamber 101 and a first air curtain chamber 102 and a second air curtain chamber 103 disposed at both ends of the flue gas chamber 101 along the axial direction. The flue gas chamber 101 is connected to an air inlet pipe and an exhaust pipe. The first air curtain chamber 102 is connected to an air source. The second air curtain chamber 103 is connected to the first air curtain chamber 102.

[0048] In this embodiment, by setting a first air curtain cavity 102 and a second air curtain cavity 103 at both ends of the flue gas cavity 101, an invisible and transparent barrier can be formed at both ends of the flue gas cavity 101, which can block dust particles from passing through. When dust is generated and diffuses into the flue gas cavity 101, the air curtain barrier can block the passage of dust-laden airflow and prevent dust from entering the measurement area 101a, thereby ensuring the accuracy of dust concentration measurement; the air curtain barrier can also protect the measuring equipment from dust contamination and damage, providing a relatively clean working environment for the measuring equipment.

[0049] In an exemplary embodiment of this application, the flue gas chamber 101 is provided with an air passage 101b that connects the first air curtain chamber 102 and the second air curtain chamber 103.

[0050] In this embodiment, the first air curtain cavity 102 and the second air curtain cavity 103 are connected through the air passage 101b.

[0051] In an exemplary embodiment of this application, the beam collecting module 6 is disposed within the second air curtain cavity 103.

[0052] In this embodiment, the beam collecting module 6 is disposed in the second air curtain cavity 103, so that the beam scattered by the measurement area 101a can be collected by the beam collecting module 6 in the first time, thereby further ensuring the accuracy of the measurement results.

[0053] In an exemplary embodiment of this application, the beam collecting module 6 further includes a converging lens 603, which is used to converge a scattered beam or a calibration beam.

[0054] In this embodiment, the converging lens 603 can converge scattered light rays to form a beam with a clear direction; the first collecting component 601 is used to collect the converged beam and transmit it to the receiver, which converts the optical signal into an electrical signal.

[0055] In an exemplary embodiment of this application, the first collecting component 601 is an optical fiber, and the second collecting component 602 is an optical trap.

[0056] In this embodiment, the laser light that has passed through the dust particles without being scattered is absorbed by the optical trap.

[0057] The working principle is as follows: the beam emitted by the light source generating component 2 is divided into a measurement beam and a calibration beam by the beam splitting component 3. The calibration beam is parallel to the measurement beam by the reflector 4 to avoid measurement errors caused by different beam paths. In the measurement state, the optical path switching baffle 5 blocks the calibration beam, and only the measurement beam passes through the measurement area 101a. The scattered beam after the measurement beam is scattered by the dust particles is collected by the first collecting component 601. By measuring the intensity of the scattered light, the dust concentration can be calculated. The beam that has not been scattered is collected by the second collecting component 602. By blocking the measurement beam with the optical path switching baffle 5, the calibration beam is received by the first collecting component 601. The calibration beam compensates for changes in light source intensity, ambient light interference, and other factors, corrects the signal of the measurement beam, and ensures the accuracy of the measurement results.

[0058] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A measuring light path system of a dust concentration measuring device comprising an intake duct for introducing flue gas in a flue into the device and an exhaust duct for exhausting the flue gas out of the device, characterized in that, The application relates to a flue gas dust concentration measuring device. The device comprises: a measuring chamber in communication with the air inlet pipe and the air outlet pipe, the measuring chamber being provided with a measuring area for flue gas dust concentration measurement; a light source generating component for generating a light beam to scatter with flue gas dust particles in the measuring area; a light beam splitting component for splitting the light beam generated by the light source generating component into a measuring light beam and a calibration light beam; a mirror for reflecting the calibration light beam to make the calibration light beam parallel to the measuring light beam; a light path switching baffle for shielding the measuring light beam or the calibration light beam; 2. The measurement light path system of the dust concentration measuring device according to claim 1, characterized by: a light beam collecting module comprising a first collecting component and a second collecting component, the first collecting component being used for collecting a scattered light beam after the measuring light beam scatters with dust particles after passing through the measuring area or the calibration light beam, and the second collecting component being used for collecting a light beam which does not scatter after the measuring light beam passes through the measuring area.

3. The measurement light path system of the dust concentration measuring apparatus according to claim 1, wherein: The light source generating component is a laser diode.

4. The measurement light path system of the dust concentration measuring apparatus according to claim 3, characterized by: The light beam splitting component comprises a base and a light splitting prism, the base comprising a light inlet channel, a first light outlet channel and a second light outlet channel, the light splitting prism being located at the intersection of the light inlet channel, the first light outlet channel and the second light outlet channel, the light splitting prism being used for splitting the light beam generated by the light source generating component into a measuring light beam and a calibration light beam, the first light outlet channel being used for the measuring light beam to emit light, and the second light outlet channel being used for the calibration light beam to emit light.

5. The measurement light path system of the dust concentration measuring apparatus according to claim 4, wherein: The first light outlet channel is coaxial with the light inlet channel, and the second light outlet channel is perpendicular to the first light outlet channel.

6. The measurement light path system of the dust concentration measuring apparatus according to claim 1, wherein: The device further comprises a driving component connected with the light path switching baffle, the driving component being used for driving the light path switching baffle to flip to shield the first light outlet channel or the second light outlet channel.

7. The measurement light path system of the dust concentration measuring apparatus according to claim 6, wherein: The measuring chamber comprises a flue gas cavity and first and second air curtain cavities arranged at the two axial ends of the flue gas cavity, the flue gas cavity being in communication with the air inlet pipe and the air outlet pipe, the first air curtain cavity being in communication with an air source, and the second air curtain cavity being in communication with the first air curtain cavity.

8. The measurement light path system of the dust concentration measuring apparatus according to claim 7, wherein: An air channel is arranged on the flue gas cavity and in communication with the first air curtain cavity and the second air curtain cavity.

9. The measurement light path system of the dust concentration measuring apparatus according to claim 8, wherein: The light beam collecting module is arranged in the second air curtain cavity.

10. The measurement light path system of the dust concentration measuring apparatus according to claim 9, wherein: The light beam collecting module further comprises a converging lens for converging the scattered light beam or the calibration light beam. The first collecting component is an optical fiber, and the second collecting component is an optical trap.

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