Pollutant multi-modal perception device

Abstract

The present application relates to the technical field of pollutant detection, and discloses a multi-modal pollutant sensing device, which comprises a pipeline, a lower shell, an upper shell, a light source module, a plurality of light receiving modules and a control module; the middle part of the pipeline is provided with a plurality of light holes with different angles, the light source module and the light receiving module are arranged outside the light holes with different angles respectively; the light source module is used for emitting detection light with a specified wavelength to the inside of the pipeline; the detection light generates scattered light after passing through a fluid to be detected, and the light receiving module is used for receiving the scattered light; and the control module is used for calculating the mass concentration of each component in the fluid to be detected. More comprehensive information is obtained through multi-angle measurement, so that the characteristics of the sample can be more accurately analyzed.

Description

Technical Field

[0001] This invention relates to the field of pollutant detection technology, and in particular to a multimodal pollutant sensing device. Background Technology

[0002] Currently, many countries have conducted research on online measurement technology for pollutant mass concentration and have developed corresponding measuring instruments, such as the S40 portable particulate pollution detector from PAMAS GmbH in Germany and the DTF16 turbidity measurement system from OPTEK GmbH. However, most existing measurement systems are angle-specific. If the sample contains multiple particles with similar scattering characteristics at certain measurement angles, a angle-specific system may not be able to effectively distinguish them, thus affecting measurement accuracy and resulting in drawbacks such as limited measurement types and low accuracy. Therefore, providing a multi-modal pollutant sensing device capable of multi-angle detection can effectively improve these problems. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention provides a multimodal pollutant sensing device, comprising: a pipeline, a lower housing, an upper housing, a light source module, multiple light receiving modules, and a control module; the pipeline has multiple light-transmitting holes at different angles in its middle section, and the light source module and the light receiving modules are respectively disposed outside the light-transmitting holes at different angles;

[0004] The light source module is used to emit detection light of a specified wavelength into the inside of the pipeline; the detection light generates scattered light after passing through the fluid to be tested, and the light receiving module is used to receive the scattered light; the control module is used to calculate the mass concentration of each component in the fluid to be tested.

[0005] Optionally, the light source module includes a laser diode, a shaping module, and a reference photodetector; the shaping module is internally provided with a beam expansion and collimation module and a beam splitting module; the laser diode emits detection light, which is first expanded and collimated by the beam expansion and collimation module, and then split into reference light and measurement light by the beam splitting module. The reference light is received by the reference photodetector, and the measurement light is incident on the fluid to be measured to generate scattered light.

[0006] Optionally, the optical receiving module includes a photodetector, a coupling lens tube, a spring, and a lens tube fixing block; the lens tube fixing block has a circular through hole in the middle, the coupling lens tube is slidably disposed inside the circular through hole, a limit ring is provided on the side of the coupling lens tube facing the light-transmitting hole, and a spring is provided between the limit ring and the lens tube fixing block; a coupling lens is provided inside the coupling lens tube.

[0007] Optionally, a first annular track is provided on the outer side of the pipeline, and a track slider is slidably provided on the first annular track. The lens barrel fixing block is fixedly provided on the upper side of the track slider. A first track fixing ring is provided on the side of the first annular track away from the track slider.

[0008] Optionally, the side of the lens barrel fixing block is provided with a transverse groove and a longitudinal groove that are connected together, and the cross-sectional dimension of the longitudinal groove is larger than that of the transverse groove; a magnetic slider is slidably provided inside the longitudinal groove, and the size of the magnetic slider matches the size of the longitudinal groove; a pull wire is connected between the magnetic slider and the limiting ring.

[0009] Optionally, the transverse groove extends in the same direction as the axial direction of the coupling lens barrel, the transverse groove extends from the left end of the lens barrel fixing block to the middle, and the longitudinal groove extends from the middle of the lens barrel fixing block to the lower end; a sealing plate is provided on the outer side of the transverse groove and the longitudinal groove.

[0010] Optionally, a second annular track is provided on the outer side of the pipeline, and a track slider is slidably provided on the second annular track. The transfer module is fixedly provided on the upper side of the track slider. The transfer module includes a rectangular block, an electromagnet, an angle sensor, and a stepper motor. Receiving grooves are provided on both sides of the rectangular block, and the electromagnet and the angle sensor are respectively provided in the corresponding receiving grooves. A first sliding groove communicating with the inside of the receiving groove is provided on the top of the rectangular block corresponding to the position of the electromagnet. A second track fixing ring is provided on the side of the second annular track away from the track slider, and a toothed ring is provided on the outer side of the second track fixing ring. The stepper motor is provided on the side of the track slider facing outward, and its rotating part is engaged with the toothed ring.

[0011] Optionally, the optical receiving module further includes an optical fiber combiner; the number of photodetectors is one, and the number of coupling tubes is multiple; an optical shutter and an input arm of the optical fiber combiner are provided on the rear side of the coupling tube, the coupling tube couples the collected scattered light into the input arm, and the output arm of the optical fiber combiner transmits it to the photodetector; by controlling the opening and closing of the optical shutter, the collection of scattered light at different angles can be realized.

[0012] Optionally, the scattered light at different angles can be collected in a sequential, cyclical manner, with one cycle being the time taken to collect scattered light at each angle, and the time interval between each angle being 0.05-0.2s.

[0013] Optionally, a flow switch is installed inside the pipeline. The flow switch is not in the same plane as the optical path and is installed on the rear side of the detector assembly.

[0014] Compared with the prior art, the present invention achieves the following technical effects:

[0015] 1. The pollutant multimodal sensing device provided by the present invention can adjust the measurement angle according to different measurement needs or sample characteristics. For samples with complex composition or large differences in particle characteristics, more comprehensive information can be obtained through multi-angle measurement, thereby more accurately analyzing the characteristics of the sample.

[0016] 2. The design of the transfer module and lens barrel fixing block facilitates the addition, removal and transfer of optical receiving modules. Multiple optical receiving modules can be angled by a single transfer module, simplifying the overall structure and saving on usage costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a pollutant multimodal sensing device provided in an embodiment of the present invention;

[0018] Figure 2 This is an exploded schematic diagram of a pollutant multimodal sensing device provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of a pollutant multimodal sensing device provided in an embodiment of the present invention;

[0020] Figure 4 This is an exploded view of the internal structure of a pollutant multimodal sensing device according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of the light source module in a pollutant multimodal sensing device according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of the light receiving module in a pollutant multimodal sensing device according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the structure of the first circular track in a pollutant multimodal sensing device provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of the structure of the second annular track in a pollutant multimodal sensing device provided in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of the transfer module in a pollutant multimodal sensing device according to an embodiment of the present invention;

[0026] Figure 10 This is a structural diagram of the optical receiving module in a pollutant multimodal sensing device provided in an embodiment of the present invention during transfer.

[0027] Figure 11This is a schematic diagram of the structure of the light receiving module in a pollutant multimodal sensing device provided in an embodiment of the present invention at different positions;

[0028] Figure 12 This is a schematic diagram of the structure of a pollutant multimodal sensing device provided in an embodiment of the present invention when an optical fiber combiner is used;

[0029] Figure 13 This is a schematic diagram illustrating the determination of the detection angle based on the comprehensive minimum residual, according to an embodiment of the present invention.

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] Light scattering is an optical method for measuring particle concentration based on the scattering characteristics of particles. When a light beam passes through a medium containing particles, the particles scatter the light in various directions. The intensity and distribution of the scattered light are closely related to the particle size, shape, refractive index, and concentration. By measuring the intensity and distribution of the scattered light, particle characteristics can be inferred. In practical applications, multi-angle light scattering is often used to improve measurement accuracy. By setting multiple detectors at different angles (e.g., forward, sideways, and backward), scattered light signals from different directions can be acquired. Different types of particles exhibit different scattered light distribution characteristics at different angles; therefore, multi-angle measurements can provide richer information. The mass sensitivity matrix, obtained through experimental calibration, describes the relationship between the intensity of scattered light and the particle mass concentration at different detection angles for different types of particles.

[0033] The process of establishing the mass sensitivity matrix involves preparing a mixed particle solution of known concentration, selecting a solution containing multiple particles (such as solid impurities and water particles), with the concentration of each particle known; acquiring scattered light signals, and measuring the intensity of scattered light from these mixed particle solutions of known concentration at multiple detection angles (such as 11°, 20°, 60°, 90°, 120°, etc.); calibrating the mass sensitivity by calculating the mass sensitivity of each particle at each detection angle based on the relationship between scattered light intensity and particle mass concentration, thus forming the mass sensitivity matrix. In actual measurements, to select the optimal combination of detection angles, the principle of minimum residual is usually adopted. By calculating the standard residual between the measured values ​​of each particle mass concentration and the known concentration under different combinations of detection angles, the combination of detection angles with the smallest standard residual is selected to improve the accuracy and reliability of the measurement.

[0034] This invention uses light scattering to detect pollutants. Based on the calibration results of particle mass sensitivity, the angle with the smallest comprehensive residual is selected as the detection angle. Through multi-angle measurement and matrix decoupling operation, the measurement of different particle mass concentrations in mixed particles is realized.

[0035] like Figure 1-12 As shown, an embodiment of the present invention provides a multimodal pollutant sensing device, including a pipeline 1, a lower housing 2, an upper housing 3, a light source module 4, multiple light receiving modules 5 (e.g., 2-4), and a control module 6; the pipeline 1 has multiple light-transmitting holes 101 at different angles in the middle, and the light source module 4 and the light receiving modules 5 are respectively disposed outside the light-transmitting holes at different angles;

[0036] The light source module 4 is used to emit detection light of a specified wavelength into the inside of the pipeline 1; the detection light generates scattered light after passing through the fluid to be tested, and the light receiving module 5 is used to receive the scattered light; the control module 6 is used to calculate the mass concentration of each component in the fluid to be tested.

[0037] Optionally, a window is provided on the inner side of the light-transmitting hole 101.

[0038] Optionally, flanges are provided at both ends of the pipeline 1.

[0039] Optionally, the light source module 4 includes a laser diode 41 (wavelength 635nm), a shaping module 42, and a reference photodetector 43 (photodetector); the shaping module 42 is internally equipped with a beam expansion and collimation module and a beam splitting module (beam splitter); the laser diode 41 emits detection light, which is first expanded and collimated by the beam expansion and collimation module, and then split into reference light and measurement light by the beam splitting module. The reference light is received by the reference photodetector 43 (the reference photodetector is used for the calibration of the light source. When the light source is used for a long time, the brightness will change, and the intensity of the scattered light obtained when measuring the same pollutant content will decrease, resulting in a large error in the measured pollutant content. The light source is calibrated at regular intervals to ensure accurate measurement). The measurement light is incident on the fluid to be measured to generate scattered light.

[0040] Optionally, the optical receiving module 5 includes a photodetector 51, a coupling lens tube 52, a spring 53, and a lens tube fixing block 54; the lens tube fixing block 54 has a circular through hole in the middle, the coupling lens tube 52 is slidably disposed inside the circular through hole, a limit ring 521 is provided on the side of the coupling lens tube 52 facing the light-transmitting hole 101, and a spring 53 is provided between the limit ring 521 and the lens tube fixing block 54; a coupling lens is provided inside the coupling lens tube 52.

[0041] Optionally, a limiting groove 102 is provided on the outer side of the light-transmitting hole 101; the limiting groove 102 matches the outer diameter of the coupling lens tube 52, and the diameter of the limiting groove 102 is smaller than the diameter of the limiting ring 521. The front end of the coupling lens tube 52 can be inserted into the limiting groove 102 to fix the two together.

[0042] Optionally, the sidewall of the coupling lens tube 52 is provided with a limiting slider along its axial direction, and the inner wall of the lens tube fixing block 54 is provided with a limiting groove, the size and position of the limiting groove matching the limiting slider.

[0043] Optionally, a first annular track 11 is provided on the outer side of the pipeline 1, and a track slider 7 is slidably provided on the first annular track 11. The lens barrel fixing block 54 is fixedly provided on the upper side of the track slider 7. A first track fixing ring 111 is provided on the side of the first annular track 11 away from the track slider 7.

[0044] Optionally, the track slider 7 includes a first slider 71 and a second slider 72; both the first slider 71 and the second slider 72 are provided with track grooves on their lower sides, and the size of the track grooves matches the size of the first annular track 11 (lubricating oil or balls are provided on the track grooves to reduce frictional resistance); the first slider 71 and the second slider 72 are clamped onto the first annular track 11 by bolts.

[0045] Optionally, the lens barrel fixing block 54 has a transverse groove 541 and a longitudinal groove 542 that are connected to each other on its side. The cross-sectional dimension of the longitudinal groove 542 is larger than that of the transverse groove 541. A magnetic slider 543 is slidably disposed inside the longitudinal groove 542. The size of the magnetic slider 543 matches the size of the longitudinal groove 542. A pull wire connects the magnetic slider 543 and the limiting ring 521.

[0046] Optionally, the extension direction of the transverse groove 541 is the same as the axial direction of the coupling lens barrel 52. The transverse groove 541 extends from the left end of the lens barrel fixing block 54 to the middle, and the longitudinal groove 542 extends from the middle of the lens barrel fixing block 54 to the lower end. A sealing plate 544 is provided on the outer side of the transverse groove 541 and the longitudinal groove 542.

[0047] Optionally, a second annular track 12 is provided on the outer side of the pipeline 1, and a track slider 7 is slidably provided on the second annular track 12. The transfer module 8 is fixedly provided on the upper side of the track slider 7. The transfer module 8 includes a rectangular block 81, an electromagnet 82, an angle sensor 83, and a stepper motor 84. Receiving grooves are provided on both sides of the rectangular block 81, and the electromagnet 82 and the angle sensor 83 are respectively provided in the corresponding receiving grooves. A first sliding groove 811 communicating with the inside of the receiving groove is provided on the top of the rectangular block 81 corresponding to the position of the electromagnet 82. A second track fixing ring 121 is provided on the side of the second annular track 12 away from the track slider 7, and a toothed ring 122 is provided on the outer side of the second track fixing ring 121. The stepper motor 84 is provided on the outward side of the track slider 7, and its rotating part is meshed with the toothed ring 122.

[0048] The working process of transfer module 8: as follows Figure 10 As shown, the rectangular block 81 is moved to the lower side of the lens barrel fixing block 54 by the stepper motor 84, wherein the port of the longitudinal groove 542 is aligned with the first sliding groove 811; the electromagnet 82 is energized to attract the magnetic slider 543 to the inside of the first sliding groove 811. At this time, the limiting ring 521 moves backward and away from the side of the pipe 1 under the action of the pull line. Since the magnetic slider 543 is engaged with the first sliding groove 811, the lens barrel fixing block 54 is driven to slide to the specified angle by the stepper motor 84. The electromagnet 82 is de-energized and the magnetic slider 543 is reset. At this time, the limiting ring 521 is fixed to the side of the pipe 1, completing the angle transfer process.

[0049] Optionally, the angle sensor 83 is a camera, and an angle barcode is provided on the outer ring of the conduit 1. Alternatively, the angle sensor 83 is a laser transceiver, and the outer ring of the conduit 1 is provided with equally spaced grooves to obtain angle information based on the collected light reflection information.

[0050] Optionally, the first annular track 11 and the second annular track 12 have the same size and a T-shaped cross-section; the first track fixing ring 111 and the second track fixing ring 121 have the same size; the first annular track 11, the second annular track 12, the first track fixing ring 111 and the second track fixing ring 121 are all composed of two semi-rings.

[0051] Optionally, the pipeline 1 is provided with a first positioning ring 13 and a second positioning ring 14, and a light-transmitting hole 101 is provided between the first positioning ring 13 and the second positioning ring 14; the first positioning ring 13 is used to fix the first track fixing ring 111, and the second positioning ring 14 is used to fix the second track fixing ring 121.

[0052] Optionally, the optical receiving module 5 further includes an optical fiber combiner (such as a 3×1 combiner with 3 input optical fibers and 1 output optical fiber; or a 7×1 combiner, etc.); the number of photodetectors 51 is one, and the number of coupling tubes 52 is multiple; the rear side of the coupling tube 52 is provided with an optical shutter and the input arm of the optical fiber combiner. The coupling tube 52 couples the collected scattered light into the input arm, and the output arm of the optical fiber combiner transmits it to the photodetector 51; by controlling the opening and closing of the optical shutter, the collection of scattered light at different angles can be realized.

[0053] Optionally, the scattered light from different angles can be collected sequentially in a cyclic manner, with one cycle being the time taken to collect scattered light from each angle, and the time interval between collections for each angle being 0.05-0.2s. Using an optical fiber combiner as a relay transmission module, the scattered light from different angles can be measured from the coupling tube 52 to a single photodetector 51. The coupling tube 52 couples the scattered light into the input arm of the combiner, and the optical signal is controlled by an optical shutter. The intensity of scattered light from different angles can be measured using only one photodetector 51, significantly improving the contrast of the collected signals (all signals are displayed on the same oscilloscope, and signals from different angles are divided by the collection time), while avoiding the measurement errors introduced when using multiple photodetectors (using the same detector avoids the process of calibrating multiple detectors one by one before use).

[0054] Optionally, a flow switch is installed inside the pipeline 1. The flow switch is not in the same plane as the optical path and is installed on the rear side of the detector assembly.

[0055] Optionally, the pollutant multimodal sensing device further includes a display terminal for displaying the mass concentration of each component in the fluid to be measured.

[0056] Optionally, the control module 6 is electrically connected to each module and is used for the control and data processing of each module.

[0057] The working process of the multimodal pollutant sensing device is as follows: A specified number of light receiving modules 5 are installed on the first annular track 11; the detection angle and the number of light receiving modules 5 are determined, and the light receiving modules 5 are transferred to the specified angle via the transfer module 8. During detection, the light source module 4 is turned on and the scattered light is received by the light receiving modules 5, and the mass concentration of each component in the fluid to be measured is calculated by the control module 6.

[0058] Application Examples:

[0059] When the contaminants in the fluid to be tested are iron oxide particles and water particles, based on the calibration results of particle mass sensitivity, the angle with the smaller overall minimum residual is selected as the detection angle. At angles of 20° and 60°, the overall minimum residual between the calculated and actual mass concentrations of the two types of particles is the smallest. In this case, two optical receiving modules 5 can be used, placed at positions of 20° and 60° respectively.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A multimodal pollutant sensing device, comprising: Piping, lower housing, upper housing, light source module, multiple light receiving modules, and control module; The middle part of the pipeline is provided with multiple light-transmitting holes at different angles, and the light source module and the light receiving module are respectively arranged outside the light-transmitting holes at different angles; The light source module is used to emit detection light of a specified wavelength into the inside of the pipeline; the detection light generates scattered light after passing through the fluid to be tested, and the light receiving module is used to receive the scattered light; the control module is used to calculate the mass concentration of each component in the fluid to be tested. The optical receiving module includes a photodetector, a coupling lens tube, a spring, and a lens tube fixing block. A circular through hole is provided in the middle of the lens tube fixing block. The coupling lens tube is slidably disposed inside the circular through hole. A limit ring is provided on the side of the coupling lens tube facing the light-transmitting hole. A spring is provided between the limit ring and the lens tube fixing block. A coupling lens is provided inside the coupling lens tube. A first annular track is provided on the outside of the pipeline, and a track slider is slidably provided on the first annular track. The lens barrel fixing block is fixedly provided on the upper side of the track slider; a first track fixing ring is provided on the side of the first annular track away from the track slider. The lens barrel fixing block has a horizontal groove and a vertical groove that are connected to each other on its side. The cross-sectional dimension of the vertical groove is larger than that of the horizontal groove. A magnetic slider is slidably disposed inside the vertical groove. The size of the magnetic slider matches the size of the vertical groove. A pull wire connects the magnetic slider to the limiting ring. The transverse groove extends in the same direction as the axial direction of the coupling lens tube. The transverse groove extends from the left end of the lens tube fixing block to the middle, and the longitudinal groove extends from the middle of the lens tube fixing block to the lower end. A sealing plate is provided on the outer side of the transverse groove and the longitudinal groove. A second annular track is provided on the outer side of the pipeline, and a track slider is slidably mounted on the second annular track. The transfer module is fixedly mounted on the upper side of the track slider. The transfer module includes a rectangular block, an electromagnet, an angle sensor, and a stepper motor. Receiving slots are opened on both sides of the rectangular block, and the electromagnet and the angle sensor are respectively installed in the corresponding receiving slots. A first sliding groove connecting the inside of the receiving slot is opened on the top of the rectangular block corresponding to the position of the electromagnet. A second track fixing ring is provided on the side of the second annular track away from the track slider, and a toothed ring is provided on the outer side of the second track fixing ring. The stepper motor is located on the side of the track slider facing outward, and its rotating part is engaged with the toothed ring.

2. The pollutant multimodal sensing device as described in claim 1, characterized in that, in, The light source module includes a laser diode, a shaping module, and a reference photodetector. The shaping module is internally equipped with a beam expansion and collimation module and a beam splitting module. The laser diode emits detection light, which is first expanded and collimated by the beam expansion and collimation module, and then split into reference light and measurement light by the beam splitting module. The reference light is received by the reference photodetector, and the measurement light is incident on the fluid to be measured to generate scattered light.

3. The pollutant multimodal sensing device as described in claim 1, characterized in that, in, The optical receiving module also includes an optical fiber combiner; there is one photodetector and multiple coupling tubes; an optical shutter and an input arm of the optical fiber combiner are provided on the rear side of the coupling tube, and the coupling tube couples the collected scattered light into the input arm, which is then transmitted to the photodetector by the output arm of the optical fiber combiner. By controlling the opening and closing of the light shutter, scattered light from different angles can be collected.

4. The pollutant multimodal sensing device as described in claim 3, characterized in that, in, The method for collecting scattered light at different angles is to collect it sequentially in a loop. One cycle is the time taken to collect scattered light at each angle, and the time interval between each angle is 0.05-0.2s.

5. The pollutant multimodal sensing device as described in claim 1, characterized in that, in, A flow switch is installed inside the pipeline. The flow switch is not in the same plane as the optical path and is installed on the rear side of the detector assembly.

Images