Accurate measurement of the anti-spray amount of the pot and measuring method

Abstract

The application provides a precise measurement splash-proof measuring jug and a measuring method, which solves the problems of poor flow metering precision and the like, and comprises a jug body with an indicating scale, an opening at the top of the jug body is closed by a cover body, the cover body is provided with a splash-proof assembly for fixing a flow tube, and the jug body is provided with a measuring assembly for keeping the internal liquid level and detecting the liquid level height. The application has the advantages of high metering precision, small error and the like.

Description

Technical Field

[0001] This invention belongs to the technical field of medical drainage equipment, specifically relating to a precise anti-splash measuring vessel and a measuring method. Background Technology

[0002] Traditional drainage cups are typically open containers with equal width at the top and bottom or a simple conical shape, requiring manual reading based on graduations printed on the side walls. This design has several drawbacks in practical use: First, measurement accuracy is limited by the cup's size. When drainage fluid is insufficient, the scale resolution of traditional large-capacity cups is inadequate, making it impossible to accurately read small volumes of fluid. Medical staff must then use precision measuring cups or disposable syringes for secondary measurements, increasing workload and consumable costs. Conversely, if drainage fluid is excessive, the small measuring cup's capacity is insufficient, requiring repeated pouring and accumulation, which easily introduces human error.

[0003] Furthermore, traditional measuring cups are open-mouthed, making them prone to splashing when the liquid is poured due to excessive impact. This can lead to contamination of the surrounding environment, the operator's skin, and clothing with potentially infectious fluids such as blood, pus, and serous fluid. For patients returning home with drainage tubes, splashing not only contaminates the home environment but also poses a potential health threat to family members. Unsteady hands can also cause spills when transferring the measuring cup and taking readings. Additionally, manual readings rely on the operator's judgment of aligning the lowest point of the concave surface with the graduation line; readings can vary between different individuals and under different lighting conditions, and factors such as liquid residue and foam can further interfere with accuracy. For patients requiring long-term drainage volume monitoring, the accumulation of these measurement errors can affect clinical judgment.

[0004] To address the aforementioned problems, this invention proposes a precision measuring anti-splash measuring vessel that offers excellent anti-splash performance, effectively improves measurement accuracy, and reduces measurement errors. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a precision measuring vessel with high measurement accuracy and good anti-splash performance.

[0006] To achieve the above objectives, the present invention provides a precision measuring anti-splash measuring vessel, comprising a vessel body with an indicating scale, characterized in that the top opening of the vessel body is closed by a lid, the lid having an anti-splash assembly for inserting and fixing a drain tube, and the vessel body having a measuring assembly for maintaining the internal liquid level and detecting the liquid level height.

[0007] In some specific embodiments, the anti-splash assembly includes a fixed port located at the center of the cover for inserting a drainage tube, and the inner side of the fixed port is provided with silicone petals arranged in a centrally symmetrical manner; one side of the pot body has an outwardly extending spout equipped with a movable cap, and the other side of the pot body is provided with a handle.

[0008] In some specific embodiments, the pot body and lid are made of opaque material, the side wall of the pot body has a visible light-transmitting window with an indicator scale, and the bottom of the pot body is closed by a disc-shaped transparent base; the measuring component includes a measuring seat for placing the transparent base at the lower end of the pot body, a balance positioning component is provided between the measuring seat and the pot body, and the measuring seat has a detection component that is opposite to the inside of the pot body.

[0009] In some specific embodiments, the balancing positioning component includes a positioning platform disposed on the upper end of the measuring base and into which the measuring base is embedded. The positioning platform and the transparent base are provided with interlocking positioning grooves and positioning protrusions. The measuring base has a built-in level. A suction cup seat is movably mounted on the lower end of the measuring base. The upper end of the suction cup seat has a movable concave surface. The lower end of the measuring base has a movable convex surface that fits against the movable concave surface. A locking plate opposite to the lower end of the movable concave surface is movably connected to the center of the movable convex surface. A movable opening is provided at the center of the movable concave surface for a connecting rod on the locking plate to pass through. A locking ring with anti-slip stripes is rotatably mounted on the measuring base. The locking ring is threadedly connected to the connecting rod of the locking plate. Rotation of the locking ring causes the locking plate to fit and press against or separate from the movable concave surface.

[0010] In some specific embodiments, the detection component includes a scattering surface disposed on the lower surface of the cover, and the measuring base contains multiple sets of laser emitting units. Each set of laser emitting units emits a measuring beam upward from below the transparent base at different emission angles. The measuring beam penetrates the interior of the vessel and is refracted by the liquid surface inside the vessel before illuminating the scattering surface to form a light spot. The measuring base is equipped with at least one light receiving unit for receiving diffusely reflected light returned from the scattering surface and detecting the position information of the light spots formed by each measuring beam. The light receiving unit is connected to a processing unit for acquiring multiple sets of light spot position data corresponding to the multiple sets of laser emitting units, jointly solving for the liquid level height and the current refractive index of the liquid based on the differences in the positions of each set of light spots, and converting the liquid level height into liquid volume.

[0011] In some specific embodiments, the multiple laser emitting units include at least a first laser emitting unit with a first emission angle and a second laser emitting unit with a second emission angle, and the difference between the first emission angle and the second emission angle is a fixed value between 5° and 15°; the light receiving unit is a two-dimensional position-sensitive detector or image sensor, used to output the two-dimensional coordinates of each light spot on a preset receiving plane; the processing unit has a built-in algorithm for solving a nonlinear equation system based on optical geometry, which uses the different sensitivities of the light spot offset to the liquid level height and refractive index at different emission angles to jointly solve for the liquid level height and refractive index.

[0012] In some specific embodiments, an adjustment platform is provided inside the measuring seat, and the laser emitting unit and the light receiving unit are mounted on the adjustment platform; the adjustment platform is driven by a motor to rotate around the central axis of the vessel, so that the laser emitting unit performs circumferential multi-angle scanning of the liquid surface; the processing unit fits the liquid surface plane and compensates for tilting based on the liquid level height data obtained at each angle after one rotation; the laser emitting units are evenly arranged circumferentially on the adjustment platform and rotate synchronously to perform multi-angle scanning; the processing unit simultaneously collects the position data of the light spot at multiple angles and emission angles in one rotation scan, and obtains the liquid level height and refractive index by solving simultaneously.

[0013] The present invention also provides a precise measurement method using the aforementioned precise measurement anti-splash measuring vessel, which includes the following steps: S1: Place the measuring vessel on the measuring base, aligning the transparent base with the optical window of the measuring base; S2: Multiple sets of laser emitting units emit measurement beams at different emission angles from below the transparent base. Each measurement beam penetrates the inside of the pot and is refracted at the liquid surface inside the pot. The refracted beams illuminate the scattering surface on the lower surface of the lid, forming a light spot corresponding to each emission angle. S3: The light receiving unit receives the diffuse reflected light returned by the scattering surface, detects the position information of each light spot on the preset receiving plane, and obtains the light spot position data corresponding to each emission angle; S4: The processing unit acquires multiple sets of spot position data, and based on the differences between the positions of each set of spot positions, jointly solves for the liquid level height and the current refractive index of the liquid. S5: The processing unit converts the calculated liquid level height into liquid volume.

[0014] In some specific embodiments, the joint solution in step S4 includes: S41: Read the pre-calibrated optical geometry model, which describes the functional relationship between the spot offset and the liquid level and refractive index at different emission angles; S42: Substitute at least two sets of spot position data corresponding to different emission angles into the optical geometric model to construct a system of simultaneous equations about the liquid level height and refractive index; S43: Solve the system of simultaneous equations using numerical iteration or analytical methods to simultaneously obtain the liquid level height and refractive index values; Step S5 includes: S51: Use the refractive index obtained in step S4 to correct the magnification factor in the optical geometric model in real time. S52: Recalculate the liquid level height using the corrected magnification factor; S53: Based on the preset relationship between the cross-sectional area of ​​the pot and its height, the corrected liquid level is converted into liquid volume.

[0015] In some specific embodiments, a rotation scanning step is further included between step S3 and step S4: S31: Drives the adjustment platform inside the measuring base, which drives multiple sets of laser emitting units and light receiving units to rotate around the central axis of the pot body; S32: During the rotation process, steps S2 and S3 are repeated at multiple circumferential angles to collect multiple sets of spot position data corresponding to each angle. Step S4 includes: S44: Perform a joint solution on the spot position data at each angle obtained in step S32 to obtain the liquid level height value corresponding to each angle; S45: Remove outliers from the liquid level height values ​​obtained from each angle, excluding individual values ​​that deviate from the normal range of the statistical distribution; S46: Using the retained effective liquid level height value, fit the liquid level plane equation to obtain the equivalent liquid level height after tilt compensation, and use the equivalent liquid level height as the input of step S5.

[0016] The advantages of this invention are as follows: the top opening of the housing is closed by a cover, and the cover has an anti-splashing component for inserting and fixing the drainage tube, which can effectively avoid splashing caused by excessive impact force of the drainage liquid. In addition, the measuring component can keep the internal liquid level horizontal, thereby enabling the detection of the liquid level height and achieving accurate measurement.

[0017] Furthermore, this invention obtains independent spot offset data through multiple sets of lasers with different emission angles, and solves the liquid level height and real-time refractive index simultaneously by solving simultaneous equations. This fundamentally eliminates the system measurement error caused by refractive index fluctuations due to changes in the composition of the drainage liquid, and solves the fundamental defect of insufficient equations in single-angle measurement schemes. All active electronic components are integrated into a reusable measuring base, and the pot body, as a passive consumable, can be soaked and disinfected at will. Rotational multi-angle scanning combined with data fusion algorithms can automatically fit the liquid surface plane to achieve tilt compensation. At the same time, outlier rejection identifies and eliminates local interference such as wall adhesion, stains, and bubbles, significantly improving the measurement robustness in actual use.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of the kettle body of the present invention; Figure 2 This is a schematic diagram of the structure of the measuring component of the present invention; Figure 3 This is a schematic diagram of the overall structure of the present invention; Figure 4 This is a structural cross-sectional view of the present invention; Figure 5 This is a flowchart of the measurement method of the present invention.

[0020] Explanation of reference numerals in the attached figures 1. Kettle body, 11. Transparent base, 12. Measuring seat, 2. Lid, 3. Anti-splash assembly, 31. Fixing port, 32. Pebble, 33. Spout, 34. Movable lid, 35. Handle, 4. Measuring assembly, 5. Balance positioning assembly, 51. Positioning platform, 52. Positioning groove, 53. Positioning protrusion, 54. Suction cup seat, 55. Movable concave surface, 56. Movable convex surface, 57. Locking piece, 58. Movable opening, 59. Locking ring, 6. Detection assembly, 61. Laser emitting unit, 62. Light receiving unit, 63. Adjustment platform. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention, and the scope of protection of the present invention is not limited to the specific embodiments described below.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "forming," "having," "setting," and "connecting," etc., should be interpreted broadly. For example, a connection can be a direct connection or an indirect connection through an intermediate medium; it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate connector; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] In this invention, unless otherwise specified, the directional terms "up," "down," "left," "right," "counterclockwise," etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The directional terms of this invention should be understood in conjunction with the actual installation state.

[0024] This invention provides a precision measuring container that prevents splashing. As a specific embodiment, see [link to specific embodiment]. Figures 1 to 4 The precision measuring anti-splash volumetric flask includes a flask body 1 with an indicating scale. The top opening of the flask body 1 is sealed by a lid 2. The lid 2 has an anti-splash component 3 for inserting and fixing a drain tube. The flask body 1 has a measuring component 4 that maintains the internal liquid level and detects the liquid level height. The flask body 1 is typically made of plastic and can be used as a disposable consumable or reused after sterilization. The measuring component 4 can be separated from the flask body 1 for convenient continuous use.

[0025] In some specific embodiments, the anti-splash assembly 3 includes a fixed port 31 located at the center of the cover 2 for inserting a drainage tube. The fixed port 31 has silicone petals 32 arranged symmetrically in a central pattern. One side of the vessel 1 has an outwardly extending spout 33 equipped with a movable cap 34, and the other side of the vessel 1 has a handle 35. The silicone petal-shaped petals 32 utilize elastic deformation to tightly adhere to the outer wall of the drainage tube, forming a semi-closed environment after the drainage tube is inserted. When the drainage fluid is rapidly discharged from the tube, the petals 32 absorb the kinetic energy of the liquid impact, preventing aerosols and droplets from splashing from the tube opening. The spout 33 is independently designed; when emptying waste liquid, the movable cap 34 can be opened to discharge it without interfering with the measurement optical path. The handle 35 is designed for easy one-handed lifting and operation, and cooperates with the positioning structure of the measuring base 12 to ensure the consistency of the vessel 1's placement each time.

[0026] In some specific embodiments, the vessel body 1 and the lid 2 are made of opaque material. A visible light-transmitting window with an indicator scale is provided on the side wall of the vessel body 1, and the bottom of the vessel body 1 is enclosed by a disc-shaped transparent base 11. The measuring component 4 includes a measuring seat 12 for placing the transparent base 11 at the lower end of the vessel body 1. A balancing positioning component 5 is provided between the measuring seat 12 and the vessel body 1. The measuring seat 12 has a detection component 6 opposite to the interior of the vessel body 1. The opaque vessel body 1 and the lid 2 form an optical dark chamber. External stray light is effectively blocked, and only the measuring laser and the marker fluorescence propagate inside the dark chamber, minimizing ambient light interference. The transparent base 11 is the only optical window, featuring a disc-shaped design with central symmetry, facilitating consistent optical path during circumferential rotation scanning. The visible light-transmitting window allows for manual verification of the liquid level detection.

[0027] In some specific embodiments, the balancing positioning component 5 includes a positioning platform 51 disposed on the upper end of the measuring base 12 and into which the measuring base 12 is embedded. The positioning platform 51 and the transparent base 11 are provided with a positioning groove 52 and a positioning protrusion 53 that engage with each other. The measuring base 12 has a built-in level. A suction cup seat 54 is movably mounted on the lower end of the measuring base 12. A movable concave surface 55 is provided on the upper end of the suction cup seat 54. A movable convex surface 56 that fits against the movable concave surface 55 is provided on the lower end of the measuring base 12. A locking piece 57 that is opposite to the lower end of the movable concave surface 55 is movably connected to the center of the movable convex surface 56. A movable opening 58 is opened in the center of the movable concave surface 55 for the connecting rod on the locking piece 57 to pass through. A locking ring 59 with anti-slip stripes is rotatably mounted on the measuring base 12. The locking ring 59 is threadedly connected to the connecting rod of the locking piece 57. The rotation of the locking ring 59 causes the locking piece 57 to fit and press against or separate from the movable concave surface 55. The engagement of the positioning groove 52 and the positioning protrusion 53 ensures that the circumferential angle of the kettle body 1 is consistent each time it is placed, guaranteeing the alignment of the optical mark and the laser scanning path. A built-in level assists the operator in judging the tilt status. After the kettle body 1 is initially leveled, rotating the locking ring 59 causes the locking plate 57 to press against or release the movable concave surface 55 via a threaded connecting rod and other transmission structures. The entire measuring seat 12 can freely swing and adjust its angle on the ball joint of the suction cup seat 54, and is locked in place once level. This ensures the measurement accuracy of the kettle body 1 on a non-ideal platform and creates initial conditions for tilt compensation in subsequent algorithms.

[0028] In some specific embodiments, the detection component 6 includes a scattering surface disposed on the lower surface of the cover 2. The measuring base 12 has multiple sets of laser emitting units 61 built in it. Each set of laser emitting units 61 emits a measuring beam upward from below the transparent base 11 at different emission angles. The measuring beam penetrates the interior of the pot 1 and is refracted by the liquid surface inside the pot before illuminating the scattering surface to form a light spot. The laser beam enters from the bottom at an inclined angle θ and is refracted at the air-liquid interface. According to Snell's law n1sinθ1=n2sinθ2, the angle of refraction is determined by the refractive index n2 of the liquid. The refracted light continues to rise, forming a two-dimensional light spot on the scattering surface of the cover. When the liquid level changes, the spatial position of the refraction point changes, and the position of the light spot on the scattering surface shifts accordingly. The amount of shift of the light spot depends on two unknowns: the liquid level height h and the liquid refractive index n2.

[0029] The measuring base 12 is equipped with at least one light receiving unit 62, which receives diffuse reflected light returned from the scattering surface and detects the position information of the light spots formed by each measuring beam. The light receiving unit 62 is connected to a processing unit, which acquires multiple sets of light spot position data corresponding to multiple sets of laser emitting units 61, and solves the liquid level height and the current refractive index of the liquid based on the differences in the positions of each set of light spots, and converts the liquid level height into liquid volume. Traditional single-angle measurement only obtains one light spot offset d_s, but faces two unknowns h and n2, resulting in insufficient equations and an inability to uniquely determine the liquid level height. This scheme obtains at least two light spot offsets d1 and d2 by setting two or more sets of lasers with different emission angles. Since the sensitivity of the refraction angle to the refractive index n2 is different under different incident angles, the information contained in the two light spot offsets is independent. Therefore, two independent equations can be established and solved simultaneously to obtain the two unknowns h and n2. This is equivalent to using optical means to simultaneously complete the tasks of measuring liquid level and refractive index, realizing automatic adaptation to changes in the composition of the drainage liquid. The scattering surface converts the refracted light spot into diffuse reflected light, and the light receiving unit collects the two-dimensional coordinates of the light spot from the bottom up. In the entire optical path, laser emission, liquid surface refraction, top scattering, and bottom receiving form a closed loop. All active devices are located below the vessel body, while the vessel body itself retains the properties of a passive consumable.

[0030] In some specific embodiments, the multiple sets of laser emitting units 61 include at least a first laser emitting unit with a first emission angle and a second laser emitting unit with a second emission angle, and the difference between the first emission angle and the second emission angle is a fixed value between 5° and 15°. If the difference is too small, the offsets of the two sets of light spots are highly correlated, the condition number of the simultaneous equations is too large, the numerical solution is unstable, and the error in refractive index estimation will be amplified. If the difference is too large, the refracted light spot of the large-angle beam may deviate from the scattering surface region and lose signal. 5°-15° is a relatively optimal range determined by optical simulation, which ensures that the two sets of equations have sufficient independence and that the light spot always falls within the detection range.

[0031] The optical receiving unit 62 is a two-dimensional position-sensitive detector or image sensor, used to output the two-dimensional coordinates of each light spot on a preset receiving plane. The two-dimensional PSD (Position Sensitive Detector) outputs a continuous analog signal, with a fast response speed, suitable for real-time tracking of light spot positions. Image sensors (CMOS / CCD) offer higher spatial resolution and anti-interference capabilities, but have a relatively low frame rate. The appropriate optical receiving unit is selected based on actual needs. The processing unit incorporates a nonlinear equation-solving algorithm based on optical geometry. It utilizes the different sensitivities of the light spot offset to liquid level and refractive index at different emission angles to jointly solve for the liquid level and refractive index. The optical geometric model built into the processing unit expresses the light spot offset d as a nonlinear function d=f(θ,h,n) of liquid level height h and refractive index n. The light spot offsets d1 and d2 corresponding to two different emission angles θ1 and θ2 constitute a simultaneous equation system. Because the function f is nonlinear, a numerical iterative method is used for solving, typically converging to a high-precision solution in 3-5 iterations.

[0032] In some specific embodiments, an adjustment platform 63 is provided inside the measuring base 12, and a laser emitting unit 61 and a light receiving unit 62 are mounted on the adjustment platform 63. The adjustment platform 63 is driven by a motor to rotate around the central axis of the pot body 1, so that the laser emitting unit 61 performs circumferential multi-angle scanning of the liquid surface. Single-time, single-direction measurement assumes that the liquid surface is horizontal, but in actual use, the tilt of the platform, the manufacturing tolerance of the pot body, and the meniscus effect caused by the surface tension of the liquid will all violate this assumption. The rotational scanning performs multi-angle joint calculation at N circumferential angles to obtain N liquid surface height estimates. The processing unit fits the liquid surface plane based on the liquid surface height data obtained at each angle after one rotation and compensates for tilted placement. The laser emitting unit 61 is evenly arranged on the adjustment platform 63 along the circumference and rotates synchronously to perform multi-angle scanning. The N height values ​​depict the three-dimensional contour of the liquid surface in space. If the pot body is tilted, the liquid surface is a plane, and the height values ​​measured at each angle will show a sinusoidal trend. The processing unit fits the liquid surface plane equation using the least squares method, effectively converting the tilted liquid surface into a horizontal liquid surface height for the same volume, thus eliminating tilt errors. Laser emitting units are uniformly arranged circumferentially on the adjustment platform, rotating synchronously to perform multi-angle scans. During a single rotation scan, the processing unit simultaneously acquires spot position data from multiple angles and emission angles, solving a series of equations to obtain the liquid surface height and refractive index. If there are liquid droplets or stains on the inner wall of the vessel 1, only the spot signal corresponding to that angle will show an anomaly, which is identified and discarded by the statistical distribution criterion. Data from other effective angles can still accurately fit the liquid surface, significantly improving the system's robustness.

[0033] This invention also provides a precise measurement method, see [link to relevant documentation]. Figure 5The present invention employs a precision measuring container with anti-splash properties, comprising the following steps: S1: Place the measuring vessel on the measuring base 12, aligning the transparent base 11 with the optical window of the measuring base 12; the engagement of the positioning groove 52 and the positioning protrusion 53 ensures circumferential alignment; the optical window refers to the transparent area on the upper surface of the measuring base for the laser to enter and exit.

[0034] S2: Multiple laser emitting units 61 emit measurement beams at different emission angles from below the transparent base 11, tilting upwards. Each beam penetrates the interior of the vessel 1 and is refracted at the liquid surface. The refracted beams then illuminate the scattering surface on the lower surface of the lid 2, forming light spots corresponding to each emission angle. The beams are emitted simultaneously or at different times. To avoid overlapping and confusion of light spots on the detector, time-division triggering or using filters to distinguish different wavelengths of laser light can be employed.

[0035] S3: The light receiving unit 62 receives the diffuse reflected light returned by the scattering surface, detects the position information of each light spot on the preset receiving plane, and obtains the light spot position data corresponding to each emission angle; S4: The processing unit acquires multiple sets of spot position data, and based on the differences between the positions of each set of spot positions, jointly solves for the liquid level height and the current refractive index of the liquid. S5: The processing unit converts the calculated liquid level height into liquid volume.

[0036] In some specific implementations, the joint solution in step S4 includes: S41: Read the pre-calibrated optical geometry model, which describes the functional relationship between the spot offset and the liquid level and refractive index at different emission angles; S42: Substitute at least two sets of spot position data corresponding to different emission angles into the optical geometric model to construct a system of simultaneous equations about the liquid level height and refractive index; S43: Solve the simultaneous equations using numerical iteration or analytical methods to simultaneously obtain the liquid level height and refractive index values. The solvability of the simultaneous equations depends on whether the partial derivative matrix of the spot offset with respect to h and n at the two emission angles is full rank. In this scheme, the emission angle difference of 5°-15° ensures a good matrix state and stable solution.

[0037] In some specific implementations, step S5 includes: S51: Using the refractive index obtained in step S4, the magnification factor in the optical geometric model is corrected in real time; the magnification factor M is the proportionality coefficient between the spot offset Δd and the liquid level height change Δh. This factor is a function of the refractive index n, M(n). By correcting M using the real-time measured n, systematic errors caused by changes in the composition of the drainage fluid can be eliminated.

[0038] S52: Recalculate the liquid level height using the corrected magnification factor; S53: Based on the preset relationship between the cross-sectional area of ​​the vessel body 1 and its height, the corrected liquid level is converted into liquid volume. The vessel body 1 is wider at the top and narrower at the bottom, and its volume has a non-linear relationship with its height. The processing unit pre-stores a height-volume lookup table, and the volume is obtained directly from the liquid level by interpolation from the table, avoiding real-time integration calculations and ensuring low power consumption and fast response.

[0039] In some specific embodiments, a rotation scanning step is also included between step S3 and step S4: S31: Drives the adjustment stage 63 within the measuring base 12, causing multiple sets of laser emitting units 61 and light receiving units 62 to rotate around the central axis of the vessel body 1. The rotation angle step size can be set according to accuracy requirements, such as sampling once every 5°, for a total of 72 sampling points. The smaller the step size, the higher the accuracy of liquid level fitting, but the measurement time increases accordingly. A step size of 5°-10° is recommended, with a single measurement cycle of approximately 2-3 seconds.

[0040] S32: During the rotation process, steps S2 and S3 are repeated at multiple circumferential angles to collect multiple sets of spot position data corresponding to each angle. Step S4 includes: S44: Perform a joint solution on the spot position data at each angle obtained in step S32 to obtain the liquid level height value corresponding to each angle; S45: Outlier removal is performed on the liquid level height values ​​obtained from each angle, excluding individual values ​​that deviate from the normal range of the statistical distribution; outlier removal is based on the median absolute deviation (MAD) or standard deviation. For example, if the height value measured at a certain angle deviates from the overall median by more than 3 times the MAD, it is determined to be caused by interference and is removed.

[0041] S46: Using the retained effective liquid level height value, fit the liquid surface plane equation to obtain the equivalent liquid level height after tilt compensation, and use this equivalent liquid level height as the input for step S5. The liquid surface plane equation is in the form of ax + by + cz = d, where a, b, and c are the liquid surface normal vectors; or, the liquid surface plane equation is equivalently expressed as z = ax + by + c, where a, b, and c are not liquid surface direction quantities, but fitting coefficients. The equivalent liquid level height is taken as the z-value of the plane at the central axis of the vessel. This value represents the height corresponding to the same liquid volume when the liquid surface is horizontal, thereby eliminating tilt reading deviation.

[0042] To better understand the technical solution of the present invention, the following two specific embodiments are provided for illustration.

[0043] Example 1 like Figure 1-5As shown, a precision measuring and splash-proof measuring vessel provides accurate measurement for hospitalized patients and those undergoing home catheter self-care, safely handling drainage fluid and protecting the environment from contamination. The vessel features an integrated structure. During use, the transparent base 11 at the lower end of the vessel body 1 is inserted into the positioning platform 51 at the upper end of the measuring seat 12. Accurate circumferential positioning is ensured by the engagement of the positioning groove 52 and the positioning protrusion 53. Loosening the locking ring 59 allows the movable convex surface 56 at the lower end of the measuring seat 12 to rotate freely within the movable concave surface 55 of the suction cup seat 54. Observing the bubble in the built-in level of the measuring seat 12, when the bubble is centered, tightening the locking ring 59 causes the locking ring 59 to drive the locking plate 57 to press against the movable concave surface 55 via a threaded connecting rod, completing the mechanical leveling and locking. The transparent base 11 and the optical window of the measuring seat 12 are now aligned.

[0044] In addition, the measuring base 12 is equipped with two sets of laser emitting units 61: the first laser emitting unit has an emission angle θ1 = 10°, and the second laser emitting unit has an emission angle θ2 = 20°, with a difference of 10°, falling within the range of 5°-15°. Both sets of lasers use 850nm infrared lasers. The light receiving unit 62 is a two-dimensional position-sensitive detector (PSD) with a photosensitive surface of 20mm × 20mm and a resolution of 1μm. The scattering surface 21 is a barium sulfate diffuse reflection coating applied to the lower surface of the cover 2, with a reflectivity of approximately 95%. The total vertical height H from the scattering surface 21 to the upper surface of the transparent base 11 is 150.0mm, assuming that the equivalent laser emission point coincides with the upper surface of the base, i.e., h0 = 0.

[0045] The processing unit 64 has a pre-calibrated optical geometry model built in. For a laser beam with an emission angle of θ, the functional relationship between the radial offset d of the spot formed on the scattering surface 21 and the liquid surface height h and the liquid refractive index n is derived by the ray tracing method: ; The first term represents the offset caused by the laser propagating in the air above the liquid surface, and the second term represents the offset of the refracted light within the remaining height Hh. This function is stored in the form of a two-dimensional lookup table (LUT), with variables ranging from h ∈ [0, 150] mm with a step size of 0.5 mm, and n ∈ [1.330, 1.390] with a step size of 0.001. A total of 301 × 61 = 18361 grid nodes are used. Each node stores two sets of d values ​​corresponding to θ1 = 10° and θ2 = 20°. The bilinear interpolation algorithm can complete one lookup calculation within 1 μs.

[0046] Example 2 This embodiment is used for routine patients, specifically for measuring drainage fluid in a low-refractive-index environment. The drainage tube is inserted through the central fixing port 31 of the cover 2, and the silicone flap 32 elastically wraps around the tube wall to form a semi-closed environment. After opening the drainage tube latch, the drainage fluid flows smoothly into the container 1 after being buffered by the chrysanthemum petal flap, without splashing. The opaque material of the container 1 and cover 2 remains completely dark inside even under strong external light, with only the side wall's transparent window 13 allowing the human eye to observe the fluid level. After drainage is complete, the latch is closed, and the fluid level can be initially observed through the transparent window to be approximately around the 35mm mark.

[0047] The operator then turns on the measuring base 12. The adjustment platform 63 is driven by a stepper motor, which drives the two sets of laser emitting units and light receiving units 62 to rotate at a constant speed around the central axis of the pot body 1. The rotation speed is 30° / second. Every 5° of rotation, there is a 0.1-second pause to perform one emission and acquisition. The rotation is 360°, which is a total of 72 sampling angles. The single measurement cycle is about 2.5 seconds.

[0048] At each circumferential angle φ i i=1,2,…,72, processing unit 64 controls the time-division multiplexing of laser beams at intervals of 50μs for beams θ1=10° and θ2=20°, and light receiving unit 62 acquires the two-dimensional coordinates of the two beams sequentially and calculates the radial offset d. i1 and d i2 .

[0049] Taking an angle φ=0° as an example, the light receiving unit 62 measures: d1=21.3mm, d2=43.2mm. The processing unit 64 performs a Newton-Raphson iterative solution. The initial conjecture is h0=H / 2=75mm, n0=1.340. The residual vector is constructed as follows: ; The Jacobian matrix J is obtained through numerical difference using a LUT. The iterative process is as follows: In the first iteration, h1 = 30 mm and n1 = 1.333. From the LUT table, f10° = 20.45 and f20° = 41.88 are obtained, with a residual vector of [-0.85, -1.32]. The corrections Δh ≈ +5.2 mm and Δn ≈ +0.003 are calculated. In the second iteration, h2 = 35.2 mm and n2 = 1.336. From the table, f10° = 21.32 and f20° = 43.25 are obtained, with a residual vector of [+0.02, +0.05]. The result is close to convergence. In the third iteration, h is fine-tuned to 35.0 mm and n = 1.335. The residuals are less than the set thresholds of 0.01 mm and 0.0005, respectively, and the solution is complete.

[0050] Repeat the above solution for all 72 angles to obtain 72 sets of h. i ,n i Data. Some angle results are shown in the table below:

[0051] At an angle of 115°, due to a tiny droplet adhering to the vessel wall, the light spot shift at this angle is abnormal, and the calculated h is obtained. 115 =38.7mm. Calculate all 72 h values. i The median value h_med = 34.51 mm, and the median absolute deviation MAD = 0.27 mm. The consistency factor is 1.4826: the judgment threshold = 3 × 1.4826 × 0.27 = 1.20 mm | 38.7 34.51|=4.19>1.20, therefore it is determined to be an outlier and removed. At the same time, n corresponding to φ=115° is also removed. i The remaining 71 sets of data were retained.

[0052] Finally, the retained effective height values ​​are converted into three-dimensional points in the pot's coordinate system. The radius R at the point where the laser illuminates the liquid surface is 18mm. Point coordinates: ; The least-squares fitted plane equation is z = ax + by + c. Solving the normal equation yields: a = -0.0162, b = 0.0018, c = 34.48. The equivalent liquid level height, i.e., the z-value at the central axis x = 0, y = 0, is: h eff= c =34.48mm, this value has automatically compensated for the measurement deviation caused by the approximately 1.8° tilt of the tabletop.

[0053] Average refractive index at each effective angle n ˉ A =1.335, standard deviation 0.0007, consistent with the typical refractive index of slurry exudate, indicating no abnormalities in the liquid composition and no need for additional correction. If subsequent measurements... n If the deviation from the nominal value exceeds 0.01, an automatic correction process will be triggered.

[0054] The relationship between the cross-sectional area of ​​the vessel body 1 and its height z is pre-stored in the processing unit. The bottom inner diameter corresponds to an area of ​​8.0 cm², the top inner diameter corresponds to an area of ​​15.0 cm², and the height is 150 mm, increasing linearly. ; Volume converted from equivalent liquid level height h_eff = 34.48 mm: ; Substituting h_eff = 3.448cm: ; The processing unit 64 rounds the result, and the measuring device displays 28ml. Simultaneously, it uploads the data to the nurse station terminal via Bluetooth, automatically recording the patient's intake and output.

[0055] Example 3 This embodiment is used for measuring purulent drainage fluid, i.e., in a high-refractive-index scenario. After rotational scanning, taking φ=0° as an example, the light receiving unit 62 measured d1=20.9mm and d2=42.5mm. Compared with the d1=21.3mm and d2=43.2mm of a conventional patient, the difference is significant.

[0056] Processing unit 64 performs a joint solution with inputs d1=20.9, d2=42.5, and initial values ​​h0=75mm, n0=1.340. After 3 iterations, it converges to h=35.0mm, n=1.365. All angles are solved, and after outlier removal, plane fitting, and tilt compensation, h_eff=34.52mm is obtained.

[0057] Average refractive index at various angles n ˉ B =1.365, the processing unit identifies that the refractive index change exceeds the threshold and automatically enables refractive index compensation: the n parameter in the optical geometry model is updated, and the accurate h_eff = 35.0 mm is recalculated. Volume conversion: .

[0058] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0059] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0060] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A precision measuring container designed to prevent splashing, comprising a container body (1) with an indicating scale, characterized in that, The top opening of the pot body (1) is closed by the cover (2), the cover (2) has a splash-proof component (3) for inserting and fixing the drainage tube, and the pot body (1) has a measuring component (4) for keeping the internal liquid level level and detecting the liquid level height.

2. The precision measuring anti-splash measuring container according to claim 1, characterized in that, The anti-splash assembly (3) includes a fixed port (31) located at the center of the cover (2) for inserting a drainage tube. The fixed port (31) has silicone material petals (32) arranged in a centrally symmetrical manner. The pot body (1) has an outwardly extending spout (33) on one side and a movable cover (34) on the spout (33). The pot body (1) has a handle (35) on the other side.

3. The precision measuring anti-splash measuring container according to claim 1, characterized in that, The pot body (1) and lid (2) are made of opaque material. The side wall of the pot body (1) has a visible light-transmitting window with an indicator scale. The bottom of the pot body (1) is closed by a disc-shaped transparent base (11). The measuring component (4) includes a measuring seat (12) for placing the transparent base (11) at the lower end of the pot body (1). A balance positioning component (5) is provided between the measuring seat (12) and the pot body (1). The measuring seat (12) has a detection component (6) that is opposite to the inside of the pot body (1).

4. The precision measuring anti-splash measuring container according to claim 3, characterized in that, The balancing positioning component (5) includes a positioning platform (51) disposed on the upper end of the measuring base (12) and into which the measuring base (12) is embedded. A positioning groove (52) and a positioning protrusion (53) are provided between the positioning platform (51) and the transparent base (11) for mutual engagement. The measuring base (12) has a built-in level. A suction cup seat (54) is movably mounted on the lower end of the measuring base (12). A movable concave surface (55) is provided on the upper end of the suction cup seat (54). A part of the measuring base (12) is provided on the lower end to fit against the movable concave surface (55). The movable convex surface (56) is movably connected to a locking piece (57) opposite to the lower end of the movable concave surface (55). The movable concave surface (55) has a movable opening (58) at its center for the connecting rod on the locking piece (57) to pass through. A locking ring (59) with anti-slip stripes is rotatably installed on the measuring seat (12). The locking ring (59) is threadedly connected to the connecting rod of the locking piece (57). The rotation of the locking ring (59) causes the locking piece (57) to fit and press against or separate from the movable concave surface (55).

5. A precision measuring container for preventing splashing according to claim 4, characterized in that, The detection component (6) includes a scattering surface disposed on the lower surface of the cover (2). The measuring base (12) has multiple sets of laser emitting units (61) built in. Each set of laser emitting units (61) emits a measuring beam upward from below the transparent base (11) at different emission angles. The measuring beam penetrates into the interior of the pot (1) and is refracted by the liquid surface inside the pot before illuminating the scattering surface to form a light spot. The measuring base (12) is provided with at least one light receiving unit (62) for receiving diffuse reflected light returned from the scattering surface and detecting the position information of the light spot formed by each measuring beam. The light receiving unit (62) is connected to a processing unit for acquiring multiple sets of light spot position data corresponding to the multiple sets of laser emitting units (61), jointly solving the liquid level height and the refractive index of the current liquid based on the differences in the positions of each set of light spots, and converting the liquid level height into liquid volume.

6. A precision measuring container for preventing splashing according to claim 5, characterized in that, The multiple laser emitting units (61) include at least a first laser emitting unit with a first emission angle and a second laser emitting unit with a second emission angle, and the difference between the first emission angle and the second emission angle is a fixed value between 5° and 15°; the light receiving unit (62) is a two-dimensional position sensitive detector or image sensor, used to output the two-dimensional coordinates of each light spot on a preset receiving plane; the processing unit has a built-in algorithm for solving a set of nonlinear equations based on optical geometry, which uses the different sensitivities of the light spot offset to the liquid surface height and refractive index under different emission angles to jointly solve the liquid surface height and refractive index.

7. A precision measuring container for preventing splashing according to claim 5, characterized in that, An adjustment platform (63) is provided inside the measuring base (12). The laser emitting unit (61) and the light receiving unit (62) are installed on the adjustment platform (63). The adjustment platform (63) is driven by a motor to rotate around the central axis of the pot body (1), so that the laser emitting unit (61) performs circumferential multi-angle scanning of the liquid surface. The processing unit fits the liquid surface plane and compensates for the tilted placement based on the liquid surface height data obtained at each angle after one rotation. The laser emitting unit (61) is evenly arranged on the adjustment platform (63) along the circumference and rotates synchronously to perform multi-angle scanning. The processing unit simultaneously collects the spot position data of multiple angles and multiple emission angles in one rotation scan, and obtains the liquid surface height and refractive index by solving the system of equations.

8. A precise measurement method, employing the precise measurement anti-splash measuring vessel as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Place the measuring vessel on the measuring base (12) and align the transparent base (11) with the optical window of the measuring base (12); S2: Multiple laser emitting units (61) emit measurement beams from below the transparent base (11) at different emission angles. Each measurement beam enters the interior of the pot (1) and is refracted at the liquid surface inside the pot. The refracted beams illuminate the scattering surface on the lower surface of the lid (2) to form a light spot corresponding to each emission angle. S3: The light receiving unit (62) receives the diffuse reflected light returned by the scattering surface, detects the position information of each light spot on the preset receiving plane, and obtains the light spot position data corresponding to each emission angle; S4: The processing unit acquires multiple sets of spot position data, and based on the differences between the positions of each set of spot positions, jointly solves for the liquid level height and the current refractive index of the liquid. S5: The processing unit converts the calculated liquid level height into liquid volume.

9. The precise measurement method according to claim 8, characterized in that, The joint solution in step S4 includes: S41: Read the pre-calibrated optical geometry model, which describes the functional relationship between the spot offset and the liquid level and refractive index at different emission angles; S42: Substitute at least two sets of spot position data corresponding to different emission angles into the optical geometric model to construct a system of simultaneous equations about the liquid level height and refractive index; S43: Solve the system of simultaneous equations using numerical iteration or analytical methods to simultaneously obtain the liquid level height and refractive index values; Step S5 includes: S51: Use the refractive index obtained in step S4 to correct the magnification factor in the optical geometric model in real time. S52: Recalculate the liquid level height using the corrected magnification factor; S53: Based on the preset relationship between the cross-sectional area of ​​the pot body (1) and the height, the corrected liquid level height is converted into liquid volume.

10. The precise measurement method according to claim 8, characterized in that, Between step S3 and step S4, a rotation scanning step is also included: S31: Drive the adjustment platform (63) inside the measuring seat (12) to drive multiple sets of laser emitting units (61) and light receiving units (62) to rotate around the central axis of the pot body (1); S32: During the rotation process, steps S2 and S3 are repeated at multiple circumferential angles to collect multiple sets of spot position data corresponding to each angle. Step S4 includes: S44: Perform a joint solution on the spot position data at each angle obtained in step S32 to obtain the liquid level height value corresponding to each angle; S45: Remove outliers from the liquid level height values ​​obtained from each angle, excluding individual values ​​that deviate from the normal range of the statistical distribution; S46: Using the retained effective liquid level height value, fit the liquid level plane equation to obtain the equivalent liquid level height after tilt compensation, and use the equivalent liquid level height as the input of step S5.

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