Detection light path for solid powder dispersing device

Abstract

The invention provides a detection light path for a solid powder dispersing device, and belongs to the technical field of solid powder dispersing devices.The detection light path for the solid powder dispersing device comprises a light emitting assembly, a light path transmission system, a light receiver, a light trap assembly and a detection pipe, and the detection pipe is arranged in an optical detection cavity of the solid powder dispersing device; the detection tube comprises a coaxial tube diluter and a sheath gas protection device, the coaxial tube diluter is used for diluting gas entering the detection tube, and the sheath gas protection device is used for forming annular sheath gas flow, restraining powder aerosol in the center of a light path and preventing powder particles from being deposited on the cavity wall of the detection tube; the invention provides a detection light path for a solid powder dispersing device, which can solve the problem that the accuracy of a detection structure is influenced due to the fact that the concentration of the existing detection gas is too high.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of solid powder dispersion devices, in particular, relates to a detection light path for a solid powder dispersion device. BACKGROUND

[0002] The light path system of the solid powder dispersion device usually adopts optical scattering method, laser diffraction method and other technologies to detect the characteristics of the powder particles. When the laser beam passes through the powder sample, the powder particles will interact with the light beam, causing scattering or reflection of light. According to the angle and intensity of light scattering, the size and distribution of the powder particles can be deduced. Laser light source plays an important role in optical detection, and common lasers include helium-neon laser (He-Ne), diode laser, etc. When the laser beam passes through the sample, the particles will cause scattering of light, and the angle and intensity of the scattered light can reflect the particle size distribution. The optical detection system usually sets multiple light receivers to detect scattered light at different angles. These receivers calculate the particle size distribution by receiving the intensity of the scattered light. After obtaining the light scattering data, the system needs to process and analyze the signal. According to the intensity and angle distribution of the scattered light, the size and particle size distribution of the particles are calculated. Common signal processing methods include Fourier transform, backscattering calculation, etc., and through these technologies, the actual particle size information of the powder particles can be calculated.

[0003] The existing detection gas concentration is too high, which will affect the accuracy of the detection structure. SUMMARY

[0004] Therefore, the application provides a detection light path for a solid powder dispersion device, which can solve the problem that the existing detection gas concentration is too high, which will affect the accuracy of the detection structure.

[0005] The application is implemented as follows:

[0006] The application provides a detection light path for a solid powder dispersion device, which includes a light emitting assembly, a light path transmission system, a light receiver, a light trap assembly and a detection tube. The detection tube is arranged in the optical detection cavity of the solid powder dispersion device. The light emitting assembly includes multiple components, which are arranged in an arc shape as a whole, and each component is connected with a laser power regulator. One side of each light emitting component is arc-shaped, which is used to make the intensity of the light emitted by each light emitting component normally distributed in the same horizontal plane, so as to reduce the error of the light interference on the solid powder particle size measurement. The powder in the detection tube flows with the gas, and the light trap assembly is arranged on the side of the detection tube away from the light emitting assembly, which is used to avoid the influence of light reflection on detection. The light receiver is arranged between the light path transmission system and the light trap assembly.

[0007] The detection tube comprises a coaxial tube diluter for diluting the gas entering the inside of the detection tube and a sheath gas protection device for forming an annular sheath gas flow to constrain the powder aerosol in the center of the light path and prevent the powder particles from depositing on the cavity wall of the detection tube.

[0008] The technical effects of the detection light path for the solid powder dispersion device are as follows: the light emitting assembly is composed of multiple units and arranged in an arc shape. Each light emitting assembly is connected with a laser power regulator to control the laser intensity of the light emitting assembly. The design of the light emitting assembly makes the light intensity normally distributed on the same horizontal plane, which helps to reduce the error of the powder particle size measurement caused by light interference. Through such light intensity distribution, the detection system can more uniformly irradiate the powder in the powder dispersion device, ensuring the accuracy of the measurement data. The light receiver is used to receive and detect the light signal passing through the detection tube.

[0009] The coaxial tube diluter is used to dilute the gas entering the detection tube. The diluter is composed of an inner tube, an outer tube and a mixing chamber. The inner tube transports the powder aerosol to be measured, and the outer tube transports clean dilution gas. After the clean gas mixes with the powder aerosol, the powder concentration is diluted, reducing the problem of high gas concentration during measurement. The sheath gas protection device can constrain the powder aerosol in the center of the light path by forming an annular sheath gas flow, preventing particles from depositing on the detection tube wall, ensuring that the powder is always in the center of the light path, and ensuring the accuracy and stability of the light signal.

[0010] On the basis of the above technical solutions, the detection light path for the solid powder dispersion device can be further improved as follows:

[0011] The coaxial tube diluter is located at the front end of the light path and is composed of an inner tube, an outer tube and a mixing chamber. The inner tube and the outer tube are coaxially arranged. The inner tube is used to transport the powder aerosol to be measured, and the outer tube is used to transport clean dilution gas. The clean dilution gas enters through the outer tube and fully mixes with the powder aerosol in the mixing chamber, diluting the powder concentration by a factor of ten.

[0012] The sheath gas protection device is arranged at the entrance of the detection tube and is composed of a sheath gas inlet and a sheath gas nozzle. The sheath gas inlet is connected with a clean gas source, and the sheath gas nozzle surrounds the light path entrance to form an annular sheath gas flow, which constrains the powder aerosol in the center of the light path and prevents the powder particles from depositing on the cavity wall of the detection tube.

[0013] The inner tube of the coaxial tube diluter is made of stainless steel and has a cylindrical shape, which is used to transport the powder aerosol to be measured. The outer tube is made of stainless steel and has a cylindrical shape, which is used to transport clean dilution gas. The mixing chamber is made of stainless steel and has a conical shape, which is used to fully mix the powder aerosol and the dilution gas to achieve accurate dilution.

[0014] The inner tube is coaxially connected with the outer tube, the outlet of the inner tube is located at the inlet of the mixing cavity, and the outlet of the outer tube surrounds the outlet of the inner tube to form an annular gap; and the outlet of the mixing cavity is connected with the inlet of the sheath gas protection device.

[0015] The coaxial tube diluter is made of stainless steel material, the inner tube is in a cylindrical shape and is responsible for conveying the powder aerosol to be measured, and the outer tube is also in a cylindrical shape and is responsible for conveying clean dilution gas. The two are coaxially arranged, the outlet of the inner tube is located at the inlet of the mixing cavity, and the outlet of the outer tube surrounds the outlet of the inner tube to form an annular gap, so that the clean gas and the powder aerosol are fully mixed in the mixing cavity. This design can achieve precise dilution effect, dilute the powder concentration by ten times, and avoid interference of optical detection signal caused by too high concentration.

[0016] Further, the detection tube comprises an air inlet and an air outlet, the air inlet is small to control the flow rate of the gas entering the optical detection cavity, and the air outlet is much larger than the air inlet to ensure smooth discharge of the gas and prevent pressure accumulation; the light emitting assembly, the light path transmission system, the light receiver and the light trap assembly are arranged around the optical detection cavity to detect the diluted powder concentration.

[0017] The air inlet of the detection tube is small to control the flow rate of the gas entering the optical detection cavity, and the air outlet is large to ensure smooth discharge of the gas and prevent pressure accumulation from affecting the system. Reasonable design of the inlet and outlet helps to maintain the stability of the gas flow and avoid unnecessary disturbance, thereby ensuring the reliability of the detection system in operation.

[0018] Further, the light receiver is connected with a concentration inverse calculation module, and the concentration inverse calculation module inversely calculates the original concentration from the measured diluted concentration according to the dilution ratio.

[0019] The concentration inverse calculation module comprises a processor and a memory, the processor is used to execute a concentration inverse calculation algorithm, and the memory is used to store the dilution ratio, optical detection data and inverse calculation result.

[0020] After the light receiver receives the light signal passing through the detection tube, the concentration inverse calculation module can inversely calculate the original concentration from the measured diluted powder concentration according to the dilution ratio. The inverse calculation module comprises a processor and a memory, the processor executes a concentration inverse calculation algorithm, and the memory stores the dilution ratio, optical detection data and inverse calculation result. Through this inverse calculation function, the original powder concentration can be accurately obtained even under the action of the dilution gas, and the accuracy of the entire measurement process is improved.

[0021] Further, the sheath gas inlet of the sheath gas protection device is connected to a clean gas source for providing clean sheath gas; the sheath gas nozzle is made of stainless steel and has a ring shape, which is used to spray clean sheath gas in the form of a ring-shaped gas flow to wrap the powder aerosol and form a sheath gas protection layer; the sheath gas inlet is connected to the sheath gas nozzle, and the sheath gas nozzle is arranged at the inlet of the detection tube and surrounds the outlet of the coaxial tube diluter.

[0022] The beneficial effects of the above improvement scheme are that the sheath gas inlet of the sheath gas protection device is connected to a clean gas source, a ring-shaped gas flow is formed through the nozzle to wrap the clean gas flow around the powder aerosol, and a sheath gas protection layer is formed to ensure that the powder particles are not disturbed in the light path and to avoid deposition on the tube wall.

[0023] Further, the light emitting components are arranged on a fixed plate, the fixed plate has a corrugated cross-section, and the outside of the fixed plate is wrapped with a memory metal layer; the bending angle of the fixed plate is adjusted by a push rod arranged at the back of the fixed plate, and the arc angle formed by the light emitting components is adjusted; the bending range of the fixed plate is between 90° and 180°.

[0024] The push rod includes a plurality of push rods, one end of each push rod is fixedly connected to the fixed plate, and the other end of each push rod is connected to a push plate; the sizes of the plurality of push rods are in a sinusoidal distribution, and the push plate is arranged perpendicular to the arc center axis of the fixed plate.

[0025] The beneficial effects of the above improvement scheme are that the light emitting components are fixed on an adjustable fixed plate, and the cross-section of the fixed plate has a corrugated structure. By wrapping the memory metal layer, the plate has a certain shape memory function. The bending angle of the fixed plate can be adjusted by using the push rod, so as to adjust the arc angle formed by the light emitting components.

[0026] The bending range of the fixed plate is between 90° and 180°, and the push rod ensures that the light emitting components can be accurately adjusted to the required angle through a series of connection modes to meet the needs of different experimental conditions.

[0027] The push rod adjusts the layout of the light emitting components by adjusting the bending angle, which can ensure that the laser beams emitted by the light emitting components do not overlap and cover a wider detection area. The sizes of the push rods are arranged in a sinusoidal distribution to ensure that the push plate is arranged perpendicular to the bending center axis of the fixed plate. This design helps to achieve more uniform and stable light distribution and avoid uneven illumination of the light beams due to improper angle adjustment.

[0028] The side of the light emitting component from which light is emitted is provided with a hemispherical light-transmitting layer.

[0029] The side of the light emitting assembly is also designed with a hemispherical light transmission layer. This design can emit light beams more uniformly, avoid local light intensity being too large or too small, further ensure that the light distribution in the detection process is more uniform, and improve the accuracy and stability of system measurement.

[0030] Further, the end of the push plate away from the fixed plate is provided with a gas cylinder, and the gas cylinder is used to push the fixed plate to change the arc-shaped angle;

[0031] The two sides of the push rod close to the fixed plate and the push plate are designed as a horn structure, and the cross-sectional area of the central position is smaller than that of the two sides.

[0032] The beneficial effects of the above improvement scheme are that the gas cylinder is used to change the bending angle of the fixed plate to ensure flexible adjustment of the laser beam irradiation range. In addition, the structure of the push rod adopts a horn design, which can balance the stress and ensure that the distribution of the light emitting assembly is more uniform when the force is applied.

[0033] The push plate includes a connecting plate, a bottom plate and a flexible layer, the connecting plate and the flexible layer are fixedly connected with the push rod and the output shaft of the gas cylinder respectively, the flexible layer is arranged between the connecting plate and the bottom plate, and the force transmitted from the gas cylinder to the bottom plate is balanced on the flexible layer, so that the force received by the connecting plate and transmitted to the fixed plate through the push rod is balanced on the plane of the push plate;

[0034] The thickness of the bottom plate is 1.5-2.5 times the thickness of the connecting plate.

[0035] The thickness of the bottom plate of the push plate has a certain proportion with the thickness of the connecting plate, and the thickness of the bottom plate is usually 1.5-2.5 times the thickness of the connecting plate to enhance the structural stability and stress balance.

[0036] Further, a plurality of the light emitting assemblies are distributed on the fixed plate in a Fibonacci curve, for maximum coverage of the detection tube area and reduction of the overlap between the lasers;

[0037] The plurality of light emitting assemblies are connected in parallel by wires, and the laser power regulator is used to adjust the light attenuation degree when the laser beam passes.

[0038] The beneficial effects of the above improvement scheme are that a plurality of light emitting assemblies are distributed on the fixed plate according to the Fibonacci curve to maximize the coverage of the detection area and reduce the overlap between the light beams. Each light emitting assembly is connected in parallel by wires, and the laser power regulator can be used to adjust the light attenuation degree when the light beam passes, so as to control the laser intensity of each light emitting assembly and ensure that the light intensity in the experiment is accurately controllable.

[0039] Further, the optical path transmission system comprises optical fibers, lenses, optical path adjusting assemblies, beam expanders, and optical filters, the optical fibers comprise a plurality of optical fibers connected by optical fiber connectors, used for short-distance light beam transmission to ensure minimal signal transmission loss; an optical fiber collimator is arranged between the optical fibers and the detection tube, used for adjusting the light beam output by the optical fibers into parallel light beams, so that the optical fibers can uniformly irradiate the detection tube; a plurality of lenses are arranged between the optical fibers and the detection tube, used for adjusting the light path direction and changing the light propagation path to ensure that the light can irradiate the correct detection tube area; the optical path adjusting assembly is arranged between the optical fibers and the lenses, used for optimizing the light path to ensure the accuracy of the detection result; the beam expander is arranged between the optical path adjusting assembly and the detection tube, used for expanding the light beam transmitted by the optical fibers into a larger light spot, so as to irradiate more powder; a plurality of optical filters are arranged inside the optical path transmission system, used for selecting light of a specific wavelength range to exclude unnecessary stray light interference and improve the signal-to-noise ratio during detection.

[0040] The beneficial effects of the above improvement scheme are: the optical path transmission system comprises optical fibers, lenses, optical path adjusting assemblies, beam expanders, and optical filters. These components work together, the optical fibers are used for short-distance light beam transmission to ensure minimal signal transmission loss. The optical fiber collimator adjusts the light beam emitted by the optical fibers into parallel light beams to ensure uniform irradiation of the detection tube. The lenses adjust the light path by changing the light propagation direction to ensure that the light correctly irradiates the specific area of the detection tube. The optical path adjusting assembly optimizes the light path to ensure stable light effects during the detection process and reduce interference. The beam expander expands the light beam emitted by the optical fibers into a larger light spot to irradiate more powder areas and improve the detection coverage. The optical filter is used to select light of a specific wavelength range to exclude unnecessary stray light and enhance the signal-to-noise ratio to improve detection accuracy.

[0041] Further, the lens is a non-spherical conforming lens, the non-spherical structure of the lens is composed of a plurality of planes with different normal vector angles, used for color difference and aberration correction;

[0042] The included angle between the normal vectors of the adjacent planes of the lens is 15-30°.

[0043] The beneficial effects of the above improvement scheme are: the lens is a non-spherical conforming lens, a plurality of planes with different normal vector angles are spliced and combined, which can effectively correct color difference and aberration, improve the transmission quality of light, and ensure the clarity of the image and the accuracy of the measurement.

[0044] The optical filter comprises a substrate, a filter layer and a thin film coating, which are arranged in one body; the filter layer is composed of multiple transparent layers, and the interference effect is formed by the difference in refractive index between the transparent layers of different materials to realize selective transmission of light of specific wavelength and avoid the interaction between the light emitted by the light emitting assembly and ambient light.

[0045] The optical filter is composed of multiple transparent layers, and the selective transmission of light of specific wavelength is realized by the difference in refractive index to effectively avoid the interference of unnecessary stray light and further improve the signal-to-noise ratio and stability of light.

[0046] The light receiver is a photodiode, and its size is greater than the diameter of the detection tube.

[0047] The light receiver is usually a photodiode, which is relatively large in size, usually greater than the diameter of the detection tube, to ensure effective capture of all light signals. The light trap assembly is arranged opposite the light emitting assembly to prevent light from being reflected back again, reduce interference with the detection result, and ensure the stability and accuracy of the system.

[0048] Compared with the prior art, the solid powder dispersion device detection light path provided by the application has the following advantages:

[0049] The detection tube design includes a coaxial tube diluter, a sheath gas protection device and corresponding gas flow structure. The powder in the detection tube flows with the gas, and the gas entering the detection tube is diluted by the coaxial tube diluter, reducing the influence of high concentration, thereby reducing the interference of gas concentration on the optical detection signal. The sheath gas protection device surrounds the light path with sheath gas flow to constrain the powder aerosol in the center of the light path, preventing powder particles from depositing on the detection tube wall, ensuring that the powder is always in the center of the light path, and ensuring the accuracy and stability of the light signal during measurement.

[0050] The light emitting assembly is composed of multiple units arranged in an arc shape, and is connected to a laser power regulator. Each light emitting assembly emits light with a normal distribution of intensity distribution, which helps to reduce the error of powder particle size measurement caused by light interference. Through this layout, the intensity of the light changes smoothly in the same horizontal plane, ensuring that the light beam uniformly irradiates the detection area, thereby improving the accuracy of the measurement data. The control of laser intensity is adjusted by the laser power regulator to further optimize the detection process.

[0051] The optical path transmission system includes optical fibers, lenses, optical path adjustment components, beam expanders, and optical filters. Optical fibers are used for short-distance transmission to ensure minimal loss of signal transmission. Lenses adjust the direction of the optical path to ensure that the light beam accurately irradiates the specific area of the detection tube. Optical path adjustment components are used to optimize the optical path to ensure the accuracy of the detection results and reduce any unnecessary interference. Beam expanders expand the light beam into a larger spot to ensure more extensive irradiation of the powder area, improving the detection coverage. Optical filters help select specific wavelengths of light, exclude stray light interference, enhance signal-to-noise ratio, and improve the stability and accuracy of the measurement.

[0052] The light receiver is located in the optical path to receive the optical signal passing through the detection tube and perform accurate detection. It is usually large in size to ensure that all optical signals are captured. In addition, the light receiver, through the connection with the concentration inverse calculation module, can calculate the original concentration from the measured diluted concentration according to the dilution ratio. This inverse calculation function is crucial to ensure that the original powder concentration can be accurately obtained under the action of the dilution gas.

[0053] The light trap component is designed to prevent light from reflecting back after passing through the detection tube, reducing interference with the measurement results and ensuring that the light during the detection process does not cause unnecessary effects on the signal. By effectively avoiding light reflection, the stability and reliability of the measurement system are enhanced.

[0054] The coaxial tube diluter is composed of an inner tube, an outer tube, and a mixing chamber. The inner tube is responsible for transporting the powder aerosol to be measured, and the outer tube transports clean dilution gas. They are coaxially arranged, and the design of the inner and outer tubes allows the clean gas to mix with the powder aerosol sufficiently, thereby achieving accurate dilution effect. This design not only effectively reduces the powder concentration to avoid high gas concentration during measurement, but also ensures the accuracy of the dilution effect of the powder concentration, ensuring the reliability of the detection data.

[0055] The sheath gas protection device is located at the entrance of the detection tube and can form an annular sheath gas flow through the nozzle to wrap the clean gas flow around the powder aerosol, ensuring that the powder aerosol is in the center of the optical path and preventing particles from depositing on the tube wall. Through this design, the sheath gas protection device provides a stable flow environment for the powder particles, effectively preventing error sources during detection.

[0056] The light emitting component is fixed on an adjustable fixing plate, and the bending angle of the fixing plate is adjusted by a push rod, thereby adjusting the light beam emission angle of the light emitting component. This design is flexible and can accurately adjust the light distribution according to the needs of experimental conditions, avoiding light beam overlap and ensuring uniform coverage of the irradiation area. The design of the push plate ensures balanced force, allowing the light emitting component to remain stable during adjustment, further improving the accuracy of detection.

[0057] The gas inlet of the detection tube is small, which can accurately control the speed of gas flowing into the optical cavity, avoiding unstable optical signals caused by too fast gas flow. The gas outlet is large, which can smoothly discharge the gas to prevent pressure accumulation. The reasonable design of the inlet and outlet helps to maintain the stability of the gas flow, thereby ensuring the reliability of the measurement results. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 Fig. 1 is a structural schematic diagram of a detection light path for a solid powder dispersion device;

[0059] Figure 2 Fig. 2 is a structural schematic diagram of a detection tube;

[0060] Figure 3 Fig. 3 is a structural schematic diagram of an optical path transmission system;

[0061] Figure 4 Fig. 4 is a structural schematic diagram of a light emitting assembly;

[0062] Figure 5 Fig. 5 is a schematic diagram of the position of the detection light path in the solid powder dispersion device;

[0063] In the drawings, the components represented by each reference numeral are listed as follows:

[0064] 10, light emitting assembly; 11, fixed plate; 20, optical path transmission system; 21, optical fiber; 22, lens; 23, optical path adjusting assembly; 24, beam expander; 25, optical filter; 30, light receiver; 40, light trap assembly; 50, detection tube; 51, coaxial tube diluter; 52, sheath gas protection device. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0066] As Figures 1-5The embodiment is shown as an embodiment of a detection light path for a solid powder dispersion device, and comprises a light emitting assembly 10, a light path transmission system 20, a light receiver 30, a light trap assembly 40, and a detection tube 50, wherein the detection tube 50 is arranged in an optical detection cavity of the solid powder dispersion device; the light emitting assembly 10 comprises a plurality of light emitting assemblies 10, which are arranged in an arc shape as a whole, and each light emitting assembly 10 is connected with a laser power regulator; one side of each light emitting assembly 10 is arranged in an arc shape, so that the intensity of the light emitted by each light emitting assembly 10 on the same horizontal plane is normally distributed, so as to reduce the error of the interference of the light on the measurement of the particle size of the solid powder; the powder in the detection tube flows with the gas, and the light trap assembly 40 is arranged on the side of the detection tube away from the light emitting assembly 10, so as to avoid the influence of the light reflection on the detection; the light receiver 30 is arranged between the light path transmission system 20 and the light trap assembly 40.

[0067] The detection tube 50 comprises a coaxial tube diluter 51 and a sheath gas protection device 52, the coaxial tube diluter 51 is used for diluting the gas entering the inside of the detection tube 50, and the sheath gas protection device 52 is used for forming an annular sheath gas flow to constrain the powder aerosol in the center of the light path and prevent the powder particles from being deposited on the cavity wall of the detection tube 50.

[0068] In the above technical solution, the coaxial tube diluter 51 is located at the front end of the light path and is composed of an inner tube, an outer tube and a mixing cavity, the inner tube and the outer tube are coaxially arranged, the inner tube is used for conveying the powder aerosol to be measured, and the outer tube is used for conveying clean dilution gas; the clean dilution gas enters through the outer tube and is fully mixed with the powder aerosol in the mixing cavity to dilute the powder concentration by ten times.

[0069] The sheath gas protection device 52 is arranged at the inlet of the detection tube 50 and is composed of a sheath gas inlet and a sheath gas nozzle; the sheath gas inlet is connected with a clean gas source, and the sheath gas nozzle surrounds the inlet of the light path to form an annular sheath gas flow, so as to constrain the powder aerosol in the center of the light path and prevent the powder particles from being deposited on the cavity wall of the detection tube 50.

[0070] The inner tube of the coaxial tube diluter 51 is made of stainless steel and is in a cylindrical shape, which is used for conveying the powder aerosol to be measured; the outer tube is made of stainless steel and is in a cylindrical shape, which is used for conveying clean dilution gas; the mixing cavity is made of stainless steel and is in a conical shape, which is used for fully mixing the powder aerosol and the dilution gas to achieve accurate dilution.

[0071] The inner tube and the outer tube are coaxially connected, the outlet of the inner tube is located at the inlet of the mixing cavity, the outlet of the outer tube surrounds the outlet of the inner tube to form an annular gap, and the outlet of the mixing cavity is connected with the inlet of the sheath gas protection device 52.

[0072] Further, in the above technical solution, the detection tube 50 includes an air inlet and an air outlet. The air inlet is small to control the gas flow rate into the optical cavity, and the air outlet is much larger than the air inlet to ensure smooth gas discharge and prevent pressure accumulation. The light emitting assembly 10, the light path transmission system 20, the light receiver 30, and the light trap assembly 40 are arranged around the optical detection cavity to detect the concentration of the diluted powder.

[0073] Further, in the above technical solution, the light receiver 30 is connected to a concentration inverse calculation module. The concentration inverse calculation module inversely calculates the original concentration from the measured diluted concentration according to the dilution ratio.

[0074] The concentration inverse calculation module includes a processor for executing a concentration inverse calculation algorithm and a memory for storing the dilution ratio, optical detection data, and inverse calculation results.

[0075] A Fibonacci curve is a mathematical curve generated from the Fibonacci sequence. The Fibonacci sequence is a sequence of numbers in which each number is the sum of the two preceding numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, and so on. The Fibonacci curve is formed by connecting adjacent numbers in the Fibonacci sequence with straight lines.

[0076] The main purpose of using the Fibonacci curve in laser arrangement is to maximize the coverage of the sample area while minimizing the overlap between lasers, thereby improving the efficiency and accuracy of sample analysis. The Fibonacci curve has a special distribution characteristic that allows for relatively uniform coverage in a limited space, making it a viable option for laser arrangement in certain situations.

[0077] Adjusting the intensity of a laser often requires the use of a laser power attenuator. This is a device used to control the output power of a laser, typically composed of rotatable optical filters or attenuators. These filters can adjust the degree of light attenuation as the laser beam passes through by changing their position or rotation angle.

[0078] The working principle of a laser power attenuator is to adjust the position or angle of the optical filter to change the amount of attenuation the laser beam receives as it passes through, thereby controlling the power of the output laser. This device can usually change the intensity of the laser without affecting the optical properties of the laser beam, so it is one of the common methods for adjusting the power of the laser.

[0079] Further, in the above technical solution, the sheath gas inlet of the sheath gas protection device 52 is connected to a clean gas source for providing clean sheath gas; the sheath gas nozzle is made of stainless steel and has a ring shape, which functions to spray clean sheath gas in the form of a ring-shaped gas flow to wrap the powder aerosol and form a sheath gas protection layer; the sheath gas inlet is connected to the sheath gas nozzle, and the sheath gas nozzle is arranged at the inlet of the detection tube 50 and surrounds the outlet of the coaxial tube diluter.

[0080] Further, in the above technical solution, the light emitting components 10 are arranged on the fixed plate 11, the fixed plate 11 has a corrugated structure in cross section, and the outside of the fixed plate 11 is wrapped with a memory metal layer; the fixed plate 11 is adjusted in bending angle by a push rod arranged at the back of the fixed plate 11, so as to adjust the arc angle formed by the plurality of light emitting components 10; the bending range of the fixed plate 11 is between 90° and 180°.

[0081] The push rod includes a plurality of push rods, one end of each of the push rods is fixedly connected to the fixed plate 11, and the other end of each of the push rods is connected to the push plate; the sizes of the plurality of push rods are in sinusoidal distribution, so as to make the push plate be arranged perpendicularly to the arc center axis of the fixed plate 11.

[0082] Further, in the above technical solution, the end of the push plate away from the fixed plate 11 is provided with a pneumatic cylinder, and the pneumatic cylinder is used to push the fixed plate 11 to change the arc angle.

[0083] The two sides of the push rod close to the fixed plate 11 and the push plate are arranged in a horn shape, so as to balance the stress, and the cross-sectional area of the center position is smaller than that of the two sides.

[0084] Further, in the above technical solution, the plurality of light emitting components 10 are arranged in a Fibonacci curve on the fixed plate 11, so as to maximize the coverage of the detection tube area and reduce the overlap between the lasers.

[0085] The plurality of light emitting components 10 are arranged in parallel through wires, and the laser power regulator is used to adjust the light attenuation degree when the laser beam passes.

[0086] Further, in the above technical solution, the optical path transmission system 20 includes optical fibers 21, lenses 22, optical path adjusting components 23, beam expanders 24, and optical filters 25. The optical fibers 21 include multiple optical fibers connected by optical fiber connectors, used to realize short-distance beam transmission and ensure minimal signal transmission loss. An optical fiber collimator is arranged between the optical fibers 21 and the detection tube to adjust the light beam output by the optical fibers 21 into a parallel light beam, so that the optical fibers can uniformly irradiate the detection tube. Multiple lenses 22 are arranged between the optical fibers 21 and the detection tube to adjust the optical path direction and change the propagation path of the light, ensuring that the light can irradiate the correct detection tube area. An optical path adjusting component 23 is arranged between the optical fibers 21 and the lenses 22 to optimize the optical path and ensure the accuracy of the detection results. A beam expander 24 is arranged between the optical path adjusting component 23 and the detection tube to expand the light beam transmitted by the optical fibers 21 into a larger light spot, so as to more widely irradiate the powder. Multiple optical filters 25 are arranged inside the optical path transmission system 20 to select a specific wavelength range of light to exclude unnecessary stray light interference and improve the signal-to-noise ratio during the detection process.

[0087] 1. Substrate Material:

[0088] The substrate is the main support material of the optical filter, usually made of optical glass or plastic. The substrate needs to be transparent and have low absorption and low scattering properties for the required wavelength range. Common substrate materials include:

[0089] Optical Glass: such as BK7, Fused Silica, etc.

[0090] Plastic: such as Polycarbonate (PC), Polymethyl Methacrylate (PMMA), etc.

[0091] 2. Filter Layer:

[0092] The core part of the optical filter is the filter layer, which determines the optical performance of the optical filter. There are several common types of filter layers:

[0093] 3. Coating Levels:

[0094] For interference type optical filters, the filter layer is composed of multiple thin film coatings. Each thin film has different thickness and refractive index. By precisely designing the thickness and refractive index of the thin film, it can control which wavelengths of light can be transmitted, and which wavelengths of light will be reflected or attenuated. Common coating techniques include:

[0095] Evaporation Coating: Evaporate the material onto the substrate surface to form a thin film layer.

[0096] Sputtering Coating: Use Physical Vapor Deposition (PVD) method to deposit thin film material onto the substrate.

[0097] Ion Beam Deposition: A method of depositing materials on a substrate by bombarding them with an ion beam.

[0098] 4. Spectral Properties of Filters:

[0099] Transmission Curve: A plot of the transmission of a filter as a function of wavelength, which determines the filter's ability to transmit different wavelengths of light. Filters can be designed for specific wavelength ranges, such as bandpass filters (transmit within a specific range of wavelengths), bandstop filters (block a specific range of wavelengths), and high / low pass filters (allow only wavelengths above or below a certain value to pass).

[0100] Center Wavelength (Center Frequency): The central value of the range of wavelengths that a filter selects to transmit.

[0101] Half-Peak Width: The bandwidth of a filter, which is the selectivity of the filter to frequencies in the spectrum.

[0102] 5. Surface Coatings and Protective Layers:

[0103] To improve the durability of filters and reduce surface reflections, an anti-reflective coating (AR coating) is often applied to the surface of the filter to reduce light reflection and increase transmission. Some filters also have protective or scratch-resistant coatings to improve their resistance to damage.

[0104] 6. Edge Design:

[0105] The design of a filter can affect the transmission characteristics of light, especially in the edge region of the filter. Common edge designs include:

[0106] Graduated Edge: The transition from high transmission to low transmission of a filter is gradual, rather than a sharp jump.

[0107] Sharp Edge: The transmission of a filter changes sharply at a certain wavelength, allowing for precise wavelength selection.

[0108] 7. Size and Shape:

[0109] Shape: Filters are usually circular or square, suitable for different optical systems. Common sizes include 1 inch, 2 inches, 4 inches, etc.

[0110] Thickness: The thickness of a filter is usually between a few millimeters, and the thickness has an impact on its optical performance (such as transmission, reflectivity, etc.), especially in high-intensity and high-precision applications.

[0111] 8. Mounting and Frame:

[0112] The filter is usually mounted in a metal frame or support for easy installation and fixation into the optical system. The frame material can be aluminum, copper, stainless steel, etc., with light and corrosion resistance.

[0113] Further, in the above technical solution, the lens 22 is a non-spherical conforming lens, and the non-spherical structure of the lens 22 is formed by splicing and combining a plurality of planes with different normal vector angles, for correcting chromatic aberration and aberration.

[0114] The included angle between the normal vectors of the adjacent planes of the lens 22 is 15-30°.

[0115] The calibration method of the device includes: measuring the output power of the laser using a power meter or light intensity sensor to ensure that the output of the laser is stable and meets the specification requirements. Ensure that the laser beam is transmitted through the optical path with the correct angle and does not deviate too much. Use an illuminance meter or other tools to confirm the uniform distribution of the laser beam in the detection area, avoiding excessive exposure or insufficient exposure in some areas. Adjust the position of the lens and optical fiber to ensure that the light beam can be accurately transmitted to the target area. Use a calibration board or known standard object to adjust and ensure that the propagation path of the light beam does not deviate from the preset route. Adjust the distance between the lens and the light source to ensure accurate focusing of the laser beam on the correct detection area. Ensure that the light receiver is aligned correctly with the optical path and will not be disturbed when receiving scattered or reflected light. The response of the light receiver can be tested by a laser calibration source. According to the actual situation of the detection area, adjust the sensitivity of the light receiver to ensure that the system can accurately capture the light signal scattered or reflected by the powder particles. Use standard samples with known particle size and distribution to compare the measurement results with known data to adjust the sensitivity and response speed of the sensor to ensure its accuracy. Adjust the proportional relationship between the signal output by the sensor and the actual powder particle size to ensure the accuracy of the measurement data. Check the optical path of the entire system, including the light source, optical fiber, lens, light receiver, etc. components to ensure that they are on the same axis and can correctly transmit and receive light signals. Place a standard calibration board and detect whether the system can produce the expected light spot or measurement signal on the board to ensure that there is no deviation. Measure the known size and distribution of the powder sample, and calibrate the measurement results with the theoretical value to ensure that the system can correctly reflect the particle size distribution of the sample in actual use. According to the measurement results of the standard sample, adjust the algorithm model of the system to ensure that it can accurately analyze the size and distribution of the powder particles. Ensure that the light trap system can effectively absorb excess scattered light and background light to improve measurement accuracy. Standard samples can be used to test them to ensure that they do not affect the signal reception of the light receiver. After calibration is completed, use the same standard sample to measure multiple times to check the stability and accuracy of the system. If the results are consistent, the calibration is successful.

[0116] Compare known standards and measurements: By comparing the measurement results with the known standard data, it is confirmed whether the calibration is successful.

[0117] Specifically, the principle of the present application is: when in use, the angle of the light emitting assembly is adjusted using the adjustment mechanism on the fixed plate, so that the light beam is uniformly distributed and accurately irradiated to the detection area. Ensure that the light forms a suitable spot in the detection tube and does not overlap. Use optical filters to filter the light path to ensure that unnecessary stray light is removed and the signal-to-noise ratio of the system is improved. According to the needs of powder detection, adjust the arrangement angle of the light emitting assembly. The bending angle of the light emitting assembly can be adjusted by pushing the plate cylinder to obtain the best illumination angle and range. Use the push rod to adjust the bending angle (between 90° and 180°) to ensure that the laser beam can cover all directions of the area where the powder is located. Ensure that the light receiver is aligned with the detection area so that the light scattered or reflected back by the powder particles can be received. Adjust the sensitivity of the receiver to ensure that changes in the size of the powder particles can be captured and excessive background noise interference can be avoided. Start the system and start measuring. Start the sheath gas protection device to ensure that clean gas flow surrounds the powder aerosol, keeps the powder in the center of the light path, and avoids particle deposition on the detection tube wall. By controlling the system, the laser beam is irradiated to the powder area, and the laser will be scattered by the powder particles. The reflected light will be received by the light receiver. By controlling the system, the received light signal is analyzed to obtain data such as the size and distribution of the powder. The system will calculate the size and distribution of the powder particles according to the received scattered light signal. Real-time data can be viewed through a computer or display, and data can be recorded and analyzed to generate statistical charts of powder particles. During the measurement process, ensure that the light trap assembly functions normally to prevent light from being reflected back to the light receiver, thereby ensuring the accuracy of the measurement data. The light trap will absorb any reflected light that may affect the accuracy of the measurement, ensuring the stability of the system during measurement.

[0118] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A detection optical path for a solid powder dispersion device, characterized in that: The invention comprises a light emitting component (10), an optical transmission system (20), a light receiver (30), a light trap component (40) and a detection tube (50), wherein the detection tube (50) is arranged in an optical detection cavity of a solid powder dispersion device; the light emitting component (10) comprises a plurality of components, which are arranged in an arc shape as a whole, and each of the light emitting components (10) is connected to a laser power regulator; the side of each light emitting component (10) emitting light is in an arc structure, so that the intensity of the light emitted by each light emitting component (10) on the same horizontal plane is normally distributed, so as to reduce the error of the solid powder particle size measurement caused by the interference of light; the powder is located in the detection tube and flows with the gas, and the light trap component (40) is arranged on the side of the detection tube away from the light emitting component (10) to prevent the light from being reflected again and affecting the detection; the light receiver (30) is arranged between the optical transmission system (20) and the light trap component (40); The detection tube (50) includes a coaxial tube diluter (51) and a sheath gas protection device (52). The coaxial tube diluter (51) is used to dilute the gas entering the interior of the detection tube (50), and the sheath gas protection device (52) is used to form an annular sheath gas flow to confine the powder aerosol in the center of the optical path and prevent powder particles from being deposited on the cavity wall of the detection tube (50).

2. The detection optical path for a solid powder dispersion device according to claim 1, characterized in that: The coaxial tube diluter (51) is located at the front end of the optical path and is composed of an inner tube, an outer tube and a mixing chamber. The inner tube and the outer tube are coaxially arranged. The inner tube is used to transport the powder aerosol to be tested, and the outer tube is used to transport the clean dilution gas. The clean dilution gas enters through the outer tube and is fully mixed with the powder aerosol in the mixing chamber to dilute the powder concentration tenfold. The sheath gas protection device (52) is arranged at the inlet of the detection tube (50) and consists of a sheath gas inlet and a sheath gas nozzle; the sheath gas inlet is connected to a clean gas source, and the sheath gas nozzle surrounds the light path inlet to form an annular sheath gas flow, which confines the powder aerosol to the center of the light path and prevents powder particles from being deposited on the cavity wall of the detection tube (50); The inner tube of the coaxial tube diluter (51) is made of stainless steel and is cylindrical, and its function is to transport the powder aerosol to be tested; the outer tube is made of stainless steel and is cylindrical, and its function is to transport the clean dilution gas; the mixing chamber is made of stainless steel and is conical, and its function is to fully mix the powder aerosol and the dilution gas to achieve accurate dilution; The inner tube is coaxially connected to the outer tube, the outlet of the inner tube is located at the inlet of the mixing chamber, and the outlet of the outer tube surrounds the outlet of the inner tube to form an annular gap; the outlet of the mixing chamber is connected to the inlet of the sheath gas protection device (52).

3. The detection optical path for a solid powder dispersion device according to claim 2, characterized in that: The detection tube (50) comprises an air inlet and an air outlet, wherein the air inlet is very small to control the flow rate of gas entering the optical cavity, and the air outlet is much larger than the air inlet to ensure smooth discharge of gas and prevent pressure accumulation; the light emitting component (10), the optical transmission system (20), the light receiver (30) and the light trap component (40) are surrounded in the optical detection cavity and are used to detect the concentration of diluted powder.

4. The detection optical path for a solid powder dispersion device according to claim 3, characterized in that: The light receiver (30) is connected to a concentration back-calculation module, and the concentration back-calculation module back-calculates the measured diluted concentration back to the original concentration according to the dilution ratio; The concentration back-calculation module includes a processor and a memory. The processor is used to execute the concentration back-calculation algorithm, and the memory is used to store the dilution ratio, optical detection data and back-calculation results.

5. The detection optical path for a solid powder dispersion device according to claim 4, characterized in that: The sheath gas inlet of the sheath gas protection device (52) is connected to a clean gas source for providing clean sheath gas; the sheath gas nozzle is made of stainless steel and is annular in shape, and its function is to spray the clean sheath gas in the form of an annular airflow to wrap the powder aerosol and form a sheath gas protection layer; The sheath gas inlet is connected to the sheath gas nozzle, which is arranged at the inlet of the detection tube (50) and surrounds the outlet of the coaxial tube diluter.

6. The detection optical path for a solid powder dispersion device according to claim 5, characterized in that: The light emitting assembly (10) is arranged on a fixing plate (11); the fixing plate (11) has a cross-section with a corrugated structure and is wrapped with a memory metal layer on the outside; a pushing rod arranged on the back of the fixing plate (11) is used to adjust the bending angle of the fixing plate (11), thereby adjusting the arc angle formed by the plurality of light emitting assemblies (10); the bending range of the fixing plate (11) is between 90° and 180°; The push rods include a plurality of push rods, one end of which is fixedly connected to the fixed plate (11) and the other end is connected to the push plate; the sizes of the plurality of push rods are sinusoidally distributed, so as to enable the push plate and the arc-shaped central axis of the fixed plate (11) to be arranged perpendicularly.

7. The detection optical path for a solid powder dispersion device according to claim 6, characterized in that: A cylinder is provided at one end of the pushing plate away from the fixing plate (11), and the cylinder is used to push the fixing plate (11) to achieve a change in the arc angle; The push rod is arranged close to the fixed plate (11) and both sides of the push plate as a trumpet-shaped structure for balancing the force, and the cross-sectional area at the center position is smaller than the cross-sectional area at both sides.

8. The detection optical path for a solid powder dispersion device according to claim 7, characterized in that: The plurality of light emitting components (10) are distributed on the fixing plate (11) in the form of a Fibonacci curve, so as to maximize coverage of the detection tube area and reduce overlap between lasers; The plurality of light emitting components (10) are connected in parallel via electric wires, and the laser power regulator is used to adjust the light attenuation degree when the laser beam passes through.

9. The detection optical path for a solid powder dispersion device according to claim 8, characterized in that: The optical transmission system (20) includes an optical fiber (21), a lens (22), an optical path adjustment component (23), a beam expander (24) and an optical filter (25). The optical fiber (21) includes a plurality of optical fibers connected by an optical fiber connector to achieve short-distance light beam transmission and ensure minimum signal transmission loss. A fiber collimator is provided between the optical fiber (21) and the detection tube to adjust the light beam output by the optical fiber (21) into a parallel light beam so that the optical fiber can evenly illuminate the detection tube. A plurality of lenses (22) are provided between the optical fiber (21) and the detection tube to adjust the light path direction and change the light propagation path. The optical path adjustment component (23) is provided between the optical fiber (21) and the lens (22) for optimizing the optical path and ensuring the accuracy of the detection result; the beam expander (24) is provided between the optical path adjustment component (23) and the detection tube for expanding the light beam transmitted by the optical fiber (21) into a larger light spot so as to irradiate the powder more widely; a plurality of optical filters (25) are provided inside the optical path transmission system (20) for selecting light within a specific wavelength range to eliminate the interference of unnecessary stray light and improve the signal-to-noise ratio during the detection process.

10. The detection optical path for a solid powder dispersion device according to claim 9, characterized in that: The lens (22) is an aspheric conforming lens, and the aspheric structure of the lens (22) is formed by splicing and combining a plurality of planes with different normal vector angles, and is used for chromatic aberration and aberration correction; The angle between the normal vectors of adjacent planes of the lens (22) is 15-30 degrees.

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