A raindrop spectrometer calibration device

Abstract

The present application relates to laser detection equipment calibration technical field, disclose a kind of raindrop spectrometer calibration device, comprising: syringe pump, for providing stable flow liquid;Needle assembly, with the syringe pump is communicated through delivery pipeline, needle assembly can replace different inner diameter needle, cooperate syringe pump flow control droplet diameter;Rotary arm, rotary arm middle part is drivingly connected with power source, power source, for driving rotary arm rotation around shaft, after droplet obtains specified speed by adjusting rotation speed, is thrown out;Droplet receiving member, be opened in the two ends of rotary arm away from power source, for receiving the droplet that needle assembly drops.This application, can realize the wide range, accurate collaborative control of droplet size and speed, can adapt to the calibration needs of various raindrop spectrometer, provide uniform calibration reference, improve calibration accuracy and efficiency, reduce calibration cost.

Description

Technical Field

[0001] This invention relates to the field of laser detection equipment calibration technology, specifically a raindrop spectrometer calibration device. Background Technology

[0002] Raindrop spectrometers are one of the core instruments in meteorological observation. By capturing parameters such as raindrop size distribution and falling velocity, they can retrieve key meteorological data such as rainfall intensity, precipitation type, and cumulative rainfall, providing crucial data support for weather forecasting, hydrological monitoring, agricultural production, and disaster prevention and mitigation. The measurement accuracy of the raindrop spectrometer directly determines the reliability of meteorological parameter retrieval; therefore, regular calibration of the raindrop spectrometer according to relevant standards is a necessary step to ensure its observational performance.

[0003] Currently, raindrop spectrometers on the market operate on various principles, including laser scattering, optical shielding, and acoustic detection. Different principles require different parameters (size range, velocity range, stability) for the standard droplets used in calibration. However, existing calibration devices generally suffer from poor adaptability and insufficient control precision, making it difficult to meet the comprehensive calibration needs of various raindrop spectrometers. For example, commonly used mechanical simulation methods (such as rotating disc shading and free-fall steel ball simulation) have limitations, including significant differences in the physical properties of simulated particles compared to real raindrops and limitations in velocity and size ranges. In recent years, liquid jetting technology has been used to construct raindrop simulation systems. However, existing raindrop simulators suffer from limited adjustable droplet size and velocity ranges, especially for small-diameter and high-velocity raindrops, where precise control remains a technical bottleneck. Furthermore, these systems are costly and difficult to popularize. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a raindrop spectrometer calibration device that solves the problems of poor universality, low precision in droplet parameter control, and insufficient droplet morphology stability in existing raindrop spectrometer calibration devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A raindrop spectrometer calibration device includes: a syringe pump for providing a stable flow rate of liquid; a needle assembly connected to the syringe pump via a delivery pipeline, the needle assembly being replaceable with needles of different inner diameters to adjust the droplet diameter in conjunction with the syringe pump flow rate; a rotating arm with its middle section connected to a power source for driving the rotating arm to rotate around an axis, adjusting the rotation speed to allow the droplets to reach a specified velocity before being ejected; droplet receivers located at the ends of the rotating arm furthest from the power source for receiving droplets falling from the needle assembly; and a control module electrically connected to both the syringe pump and the power source for setting and adjusting the syringe pump flow rate and the power source rotation speed to achieve controllable output of droplet size and velocity.

[0007] Preferably, it also includes a speed measuring module, which is set on the droplet ejection path on the outside of the rotating arm. The speed measuring module is electrically connected to the control module and is used to detect the actual speed of the droplet and feed it back to the control module.

[0008] Preferably, the power source is a servo motor, and the output shaft of the servo motor is detachably connected to the center of the rotating arm.

[0009] Preferably, the droplet receiver is provided with a hydrophobic groove, and the droplet receiver is made of a material with hydrophobic properties or the groove wall is treated with hydrophobic modification.

[0010] Preferably, the liquid outlet of the needle in the needle assembly is hydrophobically treated, and the injection pump supplies liquid through a liquid supply module with adjustable output flow parameters.

[0011] Preferably, one end of the droplet receiver is detachably connected to one end of the rotating arm via a grooved fixing seat, and the droplet receivers are symmetrically arranged at both ends of the rotating arm.

[0012] Preferably, a first speed sensor and a second speed sensor for detecting the droplet speed are arranged on the droplet ejection path. Both the first speed sensor and the second speed sensor are electrically connected to the speed measurement module. A position sensor is provided near the rotating arm to sense whether the rotating arm is kept in a horizontal state.

[0013] Preferably, the control module includes a control chip, an operation display unit, and a drive circuit. The control chip is used to receive set parameters and output control signals, and the operation display unit is used for parameter input and display of device operating status.

[0014] The present invention has the following beneficial effects:

[0015] This raindrop spectrometer calibration device allows users to input the target droplet size and velocity via a control module, based on the type of raindrop spectrometer and calibration requirements. The control module automatically calculates and outputs control commands, adjusting the flow rate of the injection pump. The liquid output from the pump is delivered through the tubing and needle assembly to form uniform droplets, which then fall into the droplet receiving component. The power source drives the rotating arm to rotate according to the control commands, causing the droplets to move in a circular motion. Under centrifugal force, the droplets are ejected and achieve the target velocity. Finally, the standardized droplets enter the detection area of ​​the raindrop spectrometer, completing the calibration. This device enables wide-range, precise, and coordinated control of droplet size and velocity, ensuring accuracy and stability of droplet size and velocity. It is adaptable to the calibration needs of various raindrop spectrometers, providing a unified calibration benchmark for different types of raindrop spectrometers, improving calibration accuracy and efficiency, and reducing calibration costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention;

[0017] Figure 2 This is an enlarged schematic diagram of the connection between the droplet receiver and the rotating arm in the device of the present invention;

[0018] Figure 3 This is a block diagram showing the control and communication connection of the device in actual application of the present invention;

[0019] Figure 4 This is a schematic diagram illustrating the working principle of the device of the present invention: droplet generation, acceleration, and ejection.

[0020] In the diagram: 1. Injection pump; 2. Delivery line; 3. Needle assembly; 4. Rotating arm; 5. Droplet receiver; 6. Droplet; 7. Coupling; 8. Servo motor; 9. Motor controller; 10. Control module; 11. Position sensor; 12. Speed ​​measurement module; 13. First speed sensor; 14. Second speed sensor; 51. Hydrophobic groove; 52. Groove holder. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] A raindrop spectrometer calibration device includes: a syringe pump 1 for providing a stable flow rate of liquid; a needle assembly 3 connected to the syringe pump 1 via a delivery line 2, wherein the needle assembly 3 can be fitted with needles of different inner diameters to adjust the diameter of the droplets 6 in conjunction with the flow rate of the syringe pump 1; a rotating arm 4, the middle of which is connected to a power source for driving the rotating arm 4 to rotate around an axis, and the droplets 6 are ejected after the rotation speed is adjusted; droplet receiving parts 5 are located at the two ends of the rotating arm 4 away from the power source to receive the droplets 6 dripping from the needle assembly 3; and a control module 10 electrically connected to the syringe pump 1 and the power source respectively, for setting and adjusting the flow rate of the syringe pump 1 and the rotation speed of the power source to achieve controllable output of the size and speed of the droplets 6.

[0024] like Figure 1 and Figure 2As shown, in this technical solution, the user inputs the size and velocity of the target droplet 6 through the control module 10 according to the type of raindrop spectrometer to be calibrated and the calibration requirements. The control module 10 automatically calculates and outputs control commands to adjust the flow rate of the injection pump 1. The liquid output by the injection pump is formed into uniform droplets 6 through the delivery pipeline 2 and the needle assembly 3, and drips into the droplet receiving component 5. The power source drives the rotating arm 4 to rotate according to the control commands, causing the droplet 6 to perform circular motion. Under the action of centrifugal force, the droplet 6 is thrown out and obtains the target velocity. Finally, the standardized droplet 6 enters the detection area of ​​the raindrop spectrometer, completing the calibration of the raindrop spectrometer. This device can achieve wide-range, precise, and coordinated control of the size and velocity of the droplet 6, ensuring the accuracy and stability of the size and velocity of the droplet 6. It can adapt to the calibration requirements of various raindrop spectrometers, providing a unified calibration benchmark for different types of raindrop spectrometers, improving calibration accuracy and efficiency, and reducing calibration costs.

[0025] To achieve closed-loop speed regulation, such as Figure 1 As shown, in this embodiment, the raindrop spectrometer calibration device also includes a velocity measurement module 12. The velocity measurement module 12 is disposed on the droplet 6 ejection path outside the rotating arm 4. The velocity measurement module 12 is electrically connected to the control module 10 and is used to detect the actual velocity of the droplet 6 and feed it back to the control module 10.

[0026] In this embodiment, the power source is a servo motor 8, and the output shaft of the servo motor 8 is detachably connected to the center of the rotating arm 4. For example... Figure 1 As shown, in this technical solution, the output shaft of the servo motor 8 is fixedly connected to the rotating arm 4 via a coupling 7. The control module 10 is electrically connected to the servo motor 8 via a motor controller 9, which can be either the controller built into the servo motor 8 or an external controller. The servo motor 8 can flexibly adjust its rotation speed according to the instructions of the control module 10, thereby achieving precise control of the droplet 6 speed. At the same time, it has high transmission efficiency and stable operation, avoiding speed fluctuations that could cause deviations in the droplet 6 speed.

[0027] Example 2

[0028] In this embodiment, a hydrophobic groove 51 is provided on the droplet receiving component 5, and the droplet receiving component 5 is made of a material with hydrophobic properties or the groove wall of the hydrophobic groove 51 is treated with hydrophobic modification. Figure 2As shown, in this technical solution, the inner wall of the hydrophobic groove 51 is made of a hydrophobic material or has undergone hydrophobic modification treatment, possessing excellent hydrophobic properties and wear resistance. This effectively reduces the adhesion between the droplet 6 and the inner wall, preventing the droplet 6 from sticking together or deforming, and ensuring the monodispersity of the droplet 6. The groove's specifications are compatible with the size of the droplet 6 to be received, ensuring that the droplet 6 can be stably received and does not shift during rotation. The rotating arm 4 can be made of lightweight material to reduce motion inertia, improve the response efficiency and stability of rotation speed, while possessing sufficient structural strength to ensure operational reliability under long-term high-speed rotation. The conveying pipeline 2 is made of a material with low adsorption and good chemical stability to avoid liquid residue or reaction between the pipeline and the liquid, ensuring the stability of the droplet 6's composition and morphology.

[0029] To improve the dimensional stability of the generated droplets 6 and prevent liquid from adhering to the needle tip, in this embodiment, the liquid outlet of the needle in the needle assembly 3 is hydrophobically treated, and the syringe pump 1 supplies liquid through a liquid supply module with adjustable output flow parameters. A precision liquid supply device is used to stably output a preset flow rate of liquid (preferably deionized water, which can be replaced with simulated liquids suitable for different scenarios according to calibration requirements). The liquid output flow rate can be flexibly adjusted according to control commands to ensure the continuity and consistency of droplet 6 generation.

[0030] In this embodiment, one end of the droplet receiving component 5 is detachably connected to one end of the rotating arm 4 via a grooved fixing seat 52, and the droplet receiving component 5 is symmetrically arranged at both ends of the rotating arm 4.

[0031] Example 3

[0032] In this embodiment, a first velocity sensor 13 and a second velocity sensor 14 are arranged along the ejection path of the droplet 6 to detect the velocity of the droplet 6. Both the first velocity sensor 13 and the second velocity sensor 14 are electrically connected to the velocity measurement module 12. A position sensor 11 is provided near the rotating arm 4 to sense whether the rotating arm 4 remains in a horizontal state. Figure 1 As shown, in this technical solution, the first velocity sensor 13 and the second velocity sensor 14 are arranged along the ejection path of the droplet 6, and in conjunction with the velocity measurement module 12, the time difference between the droplet 6 passing through the two fixed sensors can be accurately measured. Combined with the known distance, the true flight speed of the droplet 6 can be calculated, thus providing a high-precision velocity calibration benchmark for the raindrop spectrometer. Simultaneously, the position sensor 11 located near the rotating arm 4 can monitor in real time whether the rotating arm 4 remains horizontal, ensuring that the droplet 6 is ejected with a preset horizontal initial velocity, avoiding interference from the gravitational component in velocity measurement or alteration of the droplet 6's landing trajectory due to tilting.

[0033] In this embodiment, the control module 10 includes a control chip, an operation display unit, and a drive circuit. The control chip receives set parameters and outputs control signals, while the operation display unit is used for parameter input and display of the device's operating status. Figure 2 As shown, in this technical solution, the control chip is used to receive set parameters, process feedback signals, and output control commands; the operation display unit is used for users to input the target droplet's six parameters (size, velocity), and simultaneously displays the device's working status, current droplet six parameters, and other information in real time, facilitating user operation and monitoring; the drive circuit is used to convert the control chip's commands into drive signals that can be recognized by the liquid supply module and the power drive module, ensuring accurate response from each module. Figure 3 As shown, in practical applications, a computer is used as the control module and operation display unit, and the motor controller uses the servo motor control module that comes with the servo motor.

[0034] In practical applications, the outlet end of the syringe pump 1 is sealed and connected to one end of the delivery line 2, and the other end of the delivery line 2 is coaxially and sealed to the needle assembly 3 to prevent liquid leakage; the output shaft of the servo motor 8 is connected to the center drive of the rotating arm 4 via the coupling 7; such as Figure 2 As shown, the droplet receiver 5 is detachably fixed to the end of the rotating arm 4 via the grooved fixing seat 52. The position of the needle assembly 3 is adjusted so that its outlet is directly opposite the center of the droplet receiver 5. Figure 4 To ensure the stable landing of droplet 6 into the tank, the hydrophobic groove 51 of the droplet receiving component 5 is made of hydrophobic material or has undergone professional hydrophobic treatment, which can effectively prevent droplet 6 from sticking and deforming. The motor controller 9 is electrically connected to the injection pump 1 and the servo motor 8 respectively, realizing unified control of operating parameters, and establishing bidirectional communication with the control module 10, supporting both local operation and remote control modes; the speed measuring module 12, the first speed measuring sensor 13, and the second speed measuring sensor 14 are electrically connected, and the speed measuring sensors are arranged on the path of droplet 6 to monitor the droplet ejection speed. The position sensor 11 is used to sense feedback to ensure that the rotating arm is initially kept in a horizontal state. After the connection is completed, the pipeline sealing performance is checked, the communication and signal acquisition functions of the electrical control components are tested by powering on, and the rotating arm 4 is manually rotated to confirm that there is no jamming or offset, thus completing the initial debugging of the device.

[0035] Based on the type of raindrop spectrometer to be calibrated and the calibration requirements, the operator sets the target droplet 6 size and velocity parameters through the control module 10. The device completes parameter adaptation through hardware replacement and software setting. The droplet 6 size is controlled by matching the specifications of the needle assembly 3 and adjusting the flow rate of the syringe pump 1. The droplet 6 velocity, combined with the effective length of the rotating arm 4, is calculated and set by the motor controller 9 to the target rotation speed of the servo motor 8. The speed of the droplet 6 is adjusted by changing the rotation speed, and the speed adjustment range can be further expanded by replacing the rotating arm 4 with one of different lengths.

[0036] The working principle of droplet generation, acceleration and ejection is as follows: Figure 4 As shown, after the parameters are set, the device is started, and the position sensor 11 ensures that the rotating arm 4 is initially set in a horizontal position. The injection pump 1 delivers liquid stably at the set flow rate. The liquid passes through the needle assembly 3 and forms uniform droplets 6 under the action of surface tension. The droplets 6 fall vertically into the droplet receiving part 5, and the hydrophobic groove 51 ensures that the droplets 6 are intact and do not stick. At the same time, the servo motor 8 drives the rotating arm 4 to rotate at the set speed, and the droplet receiving part 5 drives the droplets 6 to make a circular motion. When the rotating arm 4 reaches the set speed after rotating half a revolution and stops, the droplets 6 are thrown out vertically downward under the action of inertia, forming standard droplets 6 that meet the preset speed. When the droplets 6 pass through the detection area of ​​the speed sensors 13 and 14, the speed sensors 13 and 14 collect speed signals and transmit them to the speed measurement module 12. After processing the signals, the speed measurement module 12 feeds back the actual speed to the motor controller 9. The motor controller 9 compares the target value with the actual value and automatically fine-tunes the speed of the servo motor 8 to control the speed error of the droplets 6 within the accuracy range, realizing closed-loop speed control.

[0037] During calibration, the raindrop spectrometer to be calibrated is placed in the path of the standard droplet 6, ensuring that the standard droplet 6 enters the detection area stably. The device continuously outputs the standard droplet 6, and the raindrop spectrometer completes the data acquisition. The operator compares the standard parameters with the detection data and corrects the calibration coefficients of the raindrop spectrometer according to the calibration specifications. By changing the needle assembly 3 and adjusting the flow rate of the syringe pump 1 and the speed of the servo motor 8, droplets 6 of different sizes and speeds can be generated to complete the calibration of the raindrop spectrometer across its full range and in various rainfall scenarios.

[0038] Long-term use of the device requires routine maintenance. Regularly clean the delivery pipeline 2 and needle assembly 3 to prevent blockages. Periodically check the hydrophobicity of the hydrophobic groove 51 and maintain or replace it as needed. Regularly lubricate the servo motor 8 and coupling 7 to ensure stable transmission. The device has good adaptability and expandability. High-precision injection pump 1 and servo motor 8 can be replaced to improve control accuracy. Different sizes of droplet receivers 5 can be replaced via the groove fixing seat 52. Multiple sets of grooves and needles can also be added to achieve simultaneous output of multiple droplets 6. In actual calibration, in light rain scenarios, the needle assembly 3 with a smaller inner diameter needle can be replaced, and the flow rate of injection pump 1 and the speed of servo motor 8 can be reduced to generate small, low-speed droplets 6. In heavy rain scenarios, the needle assembly 3 with a larger inner diameter needle and the matching droplet receiver 5 can be replaced, and the flow rate and speed can be increased to generate large, high-speed droplets 6. This comprehensively meets the calibration needs of various raindrop spectrometers.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A raindrop spectrometer calibration device, characterized in that, The device includes: an injection pump for providing a stable flow rate of liquid; a needle assembly connected to the injection pump via a delivery pipeline, the needle assembly being replaceable with needles of different inner diameters, and the droplet diameter being adjusted in conjunction with the injection pump flow rate; a rotating arm, the middle of which is connected to a power source for driving the rotating arm to rotate around an axis, and the droplet being ejected at a specified speed by adjusting the rotation speed; droplet receivers located at the two ends of the rotating arm furthest from the power source for receiving droplets falling from the needle assembly; and a control module electrically connected to both the injection pump and the power source for setting and adjusting the injection pump flow rate and the power source rotation speed to achieve controllable output of droplet size and speed.

2. The raindrop spectrometer calibration device according to claim 1, characterized in that: It also includes a speed measurement module, which is set on the droplet ejection path on the outside of the rotating arm. The speed measurement module is electrically connected to the control module and is used to detect the actual speed of the droplet and feed it back to the control module.

3. The raindrop spectrometer calibration device according to claim 2, characterized in that: The power source is a servo motor, and the output shaft of the servo motor is detachably connected to the center of the rotating arm.

4. The raindrop spectrometer calibration device according to claim 2 or 3, characterized in that: The droplet receiving component is provided with a hydrophobic groove, and the droplet receiving component is made of a material with hydrophobic properties or the groove wall of the hydrophobic groove is treated with hydrophobic modification.

5. The raindrop spectrometer calibration device according to claim 4, characterized in that: The needle outlet of the needle assembly is hydrophobically treated, and the injection pump supplies liquid through a liquid supply module with adjustable output flow parameters.

6. The raindrop spectrometer calibration device according to claim 5, characterized in that: One end of the droplet receiver is detachably connected to one end of the rotating arm via a grooved fixing seat, and the droplet receivers are symmetrically arranged at both ends of the rotating arm.

7. The raindrop spectrometer calibration device according to claim 6, characterized in that: A first velocity sensor and a second velocity sensor are arranged along the ejection path of the droplet to detect the droplet speed. Both the first velocity sensor and the second velocity sensor are electrically connected to the velocity measurement module. A position sensor is set near the rotating arm to sense whether the rotating arm is kept in a horizontal state.

8. The raindrop spectrometer calibration device according to claim 7, characterized in that: The control module includes a control chip, an operation display unit, and a drive circuit. The control chip is used to receive set parameters and output control signals, and the operation display unit is used for parameter input and display of device operating status.

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