An apparatus and method for measuring the mass of a substance using a combination of electromagnetic and optical methods.

Abstract

This invention provides an apparatus and method for measuring the mass of a substance using a combination of electromagnetic and optical methods. The apparatus includes a fixed container, an oscillation unit, a photoelectric sensor, a photoelectric conversion circuit, a frequency detection device, and a drive unit. The oscillation unit, drive unit, and photoelectric sensor are disposed inside the fixed container. The oscillation unit is suspended from the top surface inside the fixed container, and the drive unit is located below the oscillation unit. The photoelectric sensor is externally connected to the photoelectric conversion circuit and the frequency detection device through a channel in the wall of the fixed container. The apparatus provided by this invention utilizes the photoelectric sensor to detect changes in light intensity during the movement of an object, measures the change in the object's resonant frequency caused by the change in the object's mass, and, based on the relationship between the object's mass and its resonant frequency, achieves online real-time measurement of changes in the mass of the substance. The apparatus has a simple structure, low manufacturing cost, and is convenient to install, debug, use, and maintain.

Description

Technical Field

[0001] This invention belongs to the field of quality inspection technology, and relates to a quality inspection device, and more particularly to a device and method for measuring the quality of a substance by combining electromagnetic and optical methods. Background Technology

[0002] In the fields of chemical engineering and materials science, measuring mass changes in solid samples during desorption, dissolution, condensation, catalysis, reaction, and fluid flow is crucial. Mass is typically measured using electronic weighing instruments, with electronic balances being a prime example, widely applied in all aspects of social production and daily life. However, almost all electronic weighing instruments are based on load cells, which, along with corresponding electronic circuitry, convert the unknown weight of the substance into an electrical signal, which is then converted into a corresponding actual weight value by a computer or other electronic device.

[0003] CN103207004A discloses a device for measuring particulate matter content based on a micro-oscillation method. The device includes: an oscillator with a filter membrane tray on it, a filter membrane on the tray allowing airflow, a driving unit that drives the oscillator to vibrate, and a frequency detection unit. The frequency detection unit includes a light source, a reflective surface, and a light monitoring device. The reflective surface is located on the filter membrane tray and reflects parallel light emitted from the light source onto the light monitoring device, which detects the vibration frequency and equilibrium point of the reflected light on the reflective surface. This device for measuring particulate matter content determines the oscillator frequency by detecting the oscillation frequency of the reflected light, effectively avoiding the influence of external interference such as electrical signals on the measurement results. Furthermore, the reflective surface effectively amplifies the oscillation, making the measurement results more accurate.

[0004] CN101700811A discloses a photoelectric controlled industrial weighing device, including a photoelectric control system, a production line, and a weighing system. The photoelectric control system consists of a light-emitting gun and a photoelectric sensor connected to a lifting controller and a photoelectric controller via data control lines. The production line consists of an inlet channel and an outlet channel for empty boxes mounted on a rotating table, with the rotating table connected to the photoelectric controller. The weighing system has scales and boxes on both sides of a fulcrum, a lifting controller next to a lever, and a material drop plate installed below the lifting controller. This invention can significantly reduce the labor intensity of manually weighing goods, achieve automated and continuous detection, provide stable and reliable weighing data, is easy to operate, and has a fast weighing speed, making it highly practical.

[0005] CN209372211U discloses a solid weighing device with a load cell, including a fixed tray, a support column fixedly connected to the bottom of the fixed tray, casters fixedly connected to the bottom of the support column, an instrument panel fixedly connected to the side of the fixed tray, a load cell fixedly connected to the upper surface of the fixed tray, a movable tray fixedly connected to the upper surface of the load cell, a groove formed on the upper surface of the movable tray, a fixed rod fixedly connected to the inner wall of the groove, a cover plate movably connected to the surface of the fixed rod, and a hydraulic pump fixedly connected to the inner wall of the groove. This utility model's solid weighing device with a load cell achieves the effect of facilitating the weighing of fixed items by incorporating a fixed tray, support column, casters, movable tray, groove, hydraulic pump, hydraulic rod, push rod, baffle, slide rail, sliding rod, partition, circular groove, spring, telescopic rod, and clamping plate.

[0006] It is evident that the performance of a weighing sensor directly determines the performance of the electronic weight measuring device composed of it. However, existing weighing sensor-equipped measuring devices currently suffer from limitations in their breadth and depth of application due to factors such as working principles, manufacturing costs, and ease of use and maintenance. Furthermore, in the fields of chemical reactions or material synthesis, weighing requires sampling from the reaction and then measuring with a measuring instrument, making it impossible to monitor the weight changes of the sample in real time. Therefore, developing and designing reasonable weighing testing devices and methods is essential to enable real-time online measurement of the mass of substances during material reactions. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a device and method for measuring the mass of a substance using a combination of electromagnetic and optical methods. The device provided by the present invention utilizes a photoelectric sensor to detect changes in light intensity during the motion of an object, measures the change in the object's resonant frequency caused by the change in the object's mass, and realizes online real-time measurement of the mass change of the substance based on the relationship between the object's mass and its self-resonant frequency. The device has a simple structure, low manufacturing cost, and is convenient for installation, debugging, use, and maintenance.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides an apparatus for measuring the mass of a substance by a combination of electromagnetic and optical methods. The apparatus includes a fixed container, an oscillation unit, a photoelectric sensor, a photoelectric conversion circuit, a frequency detection device, and a drive unit. The oscillation unit, drive unit, and photoelectric sensor are disposed inside the fixed container. The oscillation unit is suspended from the top surface inside the fixed container. The drive unit is located below the oscillation unit. The photoelectric sensor is connected to the photoelectric conversion circuit and the frequency detection device in sequence through a hole in the wall of the fixed container.

[0010] The device provided by this invention uses a photoelectric sensor to detect changes in light intensity during the movement of an object, measures the change in the object's resonant frequency caused by the change in the object's mass, and realizes online real-time measurement of the mass change of the substance based on the relationship between the object's mass and its self-resonant frequency. The device has a simple structure, low manufacturing cost, and is convenient to install, debug, use, and maintain.

[0011] As a preferred embodiment of the present invention, the fixed container is a tubular structure with open ends, and each of the open ends of the fixed container is provided with a detachable and fixed end cap.

[0012] It should be noted that the present invention does not impose specific requirements or special limitations on the size, shape, or other structural features of the fixed container. The role of the fixed container in the present invention is to prevent external airflow from interfering with the oscillator and the measured material. Therefore, it is understood that other fixed containers that can achieve this function can be used in the present invention. Those skilled in the art can make adaptive adjustments to the size and shape of the fixed container according to the usage scenario and testing conditions.

[0013] It should be noted that another function of the fixed container is that if the substance on the tray needs to react with a certain gas, a vent pipe can be drilled in the fixed container, and the vent pipe is connected to a gas cylinder to allow the gas to be introduced into the fixed container to react with the substance on the tray. In addition, the fixed container needs to be connected to a vacuum pipe and a pressure relief valve. Before the gas reaction, a vacuum needs to be drawn to prevent air from affecting the chemical substances or the chemical reaction.

[0014] As a preferred embodiment of the present invention, the oscillation unit includes an elastic element and a tray, the tray being suspended below the elastic element, and the oscillation unit generating simple harmonic vibration in the vertical direction under the drive of the driving element.

[0015] As a preferred embodiment of the present invention, the bottom of the tray has reflective properties.

[0016] Preferably, the tray is made of an antioxidant and corrosion resistant material.

[0017] Preferably, the elastic element is a solenoid spring.

[0018] It should be noted that this invention does not impose specific requirements or limitations on the material of the tray or the type of elastic element. The tray in this invention serves as a platform for material reaction and load-bearing, as well as providing reflective properties to reflect light signals to the photoelectric sensor. The elastic element in this invention acts as a stretching mechanism and can also be a plate spring. Therefore, it is understood that other tray materials and types of elastic elements capable of achieving similar functions can be used in this invention. Those skilled in the art can adapt the material and type of elastic element of the tray to meet the requirements of the usage scenario and testing conditions.

[0019] As a preferred embodiment of the present invention, the photoelectric sensor includes a light-emitting diode and a photodiode.

[0020] Preferably, the photoelectric sensor is located between the tray and the drive unit and near the bottom of the tray, and the photoelectric sensor is used to receive the light signal reflected by the tray.

[0021] As a preferred embodiment of the present invention, the driving unit includes a solenoid coil, a magnetic element, and a driving circuit. The magnetic element is fixed below the tray, and the solenoid coil is electrically connected to the driving circuit.

[0022] Preferably, the magnetic element is attached and fixed at the center position under the tray.

[0023] Preferably, the magnetic element is a permanent magnet or a ferromagnetic material.

[0024] It should be noted that the present invention does not impose specific requirements or limitations on the type of magnetic element. The role of the magnetic element in the present invention is to be attracted by the magnetic field generated by the magnetic coil, thereby driving the tray to perform simple harmonic motion in the vertical direction. Therefore, it can be understood that other types of magnetic elements that can achieve this function can be used in the present invention. Those skilled in the art can make adaptive adjustments to the type of magnetic element according to the usage scenario and test conditions.

[0025] As a preferred embodiment of the present invention, the frequency detection device includes an electrically connected data acquisition system and a spectrum analysis unit, and the frequency detection device is used for analyzing the resonant frequency of the oscillation unit.

[0026] As a preferred technical solution of the present invention, the data acquisition system includes a plug-in, a signal input module, and an amplification and filtering module connected to the photoelectric conversion circuit. The plug-in is electrically connected to the signal input module, the signal input module is electrically connected to the amplification and filtering module, and the amplification and filtering module is electrically connected to the analog-to-digital conversion module. The signal is converted from analog to digital and then reaches the signal output PC terminal.

[0027] It should be noted that the present invention does not impose specific requirements or limitations on the types of plug-ins. The role of plug-ins in the present invention is to serve as signal connections. Therefore, it can be understood that other types of plug-ins that can achieve this function can be used in the present invention. Those skilled in the art can make adaptive adjustments to the types of plug-ins according to the usage scenario and testing conditions.

[0028] It should be noted that the light source generator and light receiver of the photoelectric sensor of the present invention are in the same device. A suitable resistance value R1 is selected to provide a suitable voltage value to the light source generator. A suitable resistance value R3 and a variable resistor R2 are selected and the variable resistor is adjusted to provide a suitable current value to the light receiver so that the performance of the photoelectric sensor in use can be optimized. A capacitor C1 filters out some interference signals. The received light signal is connected to the frequency detection device through the 4 legs of the plug.

[0029] In a second aspect, the present invention provides a method for measuring the mass of a substance using a combination of electromagnetic and optical methods, employing the apparatus described in the first aspect to test the mass of the substance, the method comprising:

[0030] An object of known mass is placed in the oscillating unit, the drive unit is turned on, and the oscillating unit performs elastic simple harmonic motion in the vertical direction. The photoelectric sensor emits a light signal to the oscillating unit, which is reflected by the bottom of the oscillating unit. The frequency detection device collects and analyzes the data to obtain the vibration frequency. By measuring the vibration frequency of multiple known masses, the mass of the material is compared with the corresponding vibration frequency, and a correlation curve and relationship between the mass of the material and the vibration frequency are fitted. The above operation is repeated for the material to be tested, and its vibration frequency is measured. Based on the obtained correlation curve and relationship, the mass of the material to be tested is obtained.

[0031] As a preferred embodiment of the present invention, the method specifically includes the following steps:

[0032] (I) When an item of known mass is placed in a tray, the power supply of the drive circuit is turned on, the solenoid is energized and generates a magnetic field, which attracts the magnetic element to move down and stretches the elastic element. When the power supply of the drive circuit is turned off, the elastic element resets and the tray generates a simple harmonic motion in the vertical direction.

[0033] (II) The photoelectric sensor emits a light signal to the bottom of the tray. After being reflected by the bottom of the tray, the light is detected by the photoelectric sensor. Then, after passing through the photoelectric conversion circuit, the light intensity change and frequency are collected by the data acquisition system.

[0034] (III) The frequency change of simple harmonic vibration is calculated by the spectrum analysis unit. By measuring the frequency of multiple substances with known mass, the correlation curve and relationship between mass and frequency are found.

[0035] (IV) Place the unknown mass of the substance to be tested on the tray and carry out the pre-experiment preparation work, such as vacuuming and ventilating. As the reaction occurs, the mass of the substance in the tray also changes. Based on the above steps, measure the real-time vibration frequency of the substance to be tested, and obtain the mass of the substance according to the relationship between mass and vibration frequency.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] The device provided by this invention uses a photoelectric sensor to detect changes in light intensity during the movement of an object, measures the change in the object's resonant frequency caused by the change in the object's mass, and realizes online real-time measurement of the mass change of the substance based on the relationship between the object's mass and its self-resonant frequency. The device has a simple structure, low manufacturing cost, and is convenient to install, debug, use, and maintain. Attached Figure Description

[0038] Figure 1 A schematic diagram of a device for measuring the mass of a substance by combining electromagnetic and optical methods, provided as a specific embodiment of the present invention;

[0039] Figure 2 A schematic diagram of a photoelectric conversion circuit for a method of measuring the mass of a substance by combining electromagnetic and optical methods, provided as a specific embodiment of the present invention;

[0040] Figure 3 A mass-light intensity change frequency measurement curve of a method for measuring the mass of a substance by combining electromagnetic and optical methods, provided as an application example of the present invention;

[0041] Among them, 1-elastic element; 2-tray; 3-channel; 4-magnetic element; 5-sowary coil; 6-photoelectric sensor; 7-drive circuit; 8-photoelectric conversion circuit; 9-spectrum analysis unit; 10-data acquisition system; 11-fixed container. Detailed Implementation

[0042] It should be understood that in the description of this invention, the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0043] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] Those skilled in the art should understand that the present invention necessarily includes the necessary pipelines, conventional valves and general pump equipment for achieving complete process, but the above content is not the main inventive point of the present invention. Those skilled in the art can add layouts based on process flow and equipment structure selection, and the present invention does not make any special requirements or specific limitations in this regard.

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0046] In one specific embodiment, the present invention provides an apparatus for measuring the mass of a substance using a combination of electromagnetic and optical methods, the apparatus being as follows: Figure 1 As shown, it includes a fixed container 11, an oscillation unit, a photoelectric sensor 6, a photoelectric conversion circuit 8, a frequency detection device, and a drive unit. The fixed container 11 is equipped with the oscillation unit, the drive unit, and the photoelectric sensor 6. The oscillation unit is suspended on the top surface inside the fixed container 11, and the drive unit is located below the oscillation unit. The photoelectric sensor 6 is connected to the photoelectric conversion circuit 8 and the frequency detection device in sequence through the hole 3 on the wall of the fixed container 11.

[0047] The fixed container 11 is a tubular structure with open ends, and each of the open ends of the fixed container 11 is provided with a detachable and fixed end cap. The oscillation unit includes an elastic element 1 and a tray 2. The tray 2 is suspended below the elastic element 1. Under the drive of the drive unit, the tray 2 generates simple harmonic vibration in the vertical direction. The bottom of the tray 2 has reflective properties. Furthermore, the tray 2 is made of an anti-oxidation and anti-corrosion material, and the elastic element 1 is a solenoid spring.

[0048] A photoelectric sensor 6 is located between the tray 2 and the drive unit. The photoelectric sensor 6 is used to receive the light signal reflected by the tray 2. The drive unit includes a solenoid 5, a magnetic element 4, and a drive circuit 7. The magnetic element 4 is fixed below the tray 2. The solenoid 5 is electrically connected to the drive circuit 7. The magnetic element 4 is pasted and fixed at the center position below the tray 2. The magnetic element 4 is a magnet.

[0049] The frequency detection device includes a data acquisition system 10 and a spectrum analysis unit 9 that are electrically connected. The frequency detection device is used to analyze the resonant frequency of the oscillation unit. The data acquisition system 10 includes a plug-in connected to the photoelectric conversion circuit, a signal input module, and an amplification and filtering module. The plug-in is electrically connected to the signal input module, the signal input module is electrically connected to the amplification and filtering module, and the amplification and filtering module is electrically connected to the analog-to-digital conversion module. The signal is converted from analog to digital and then reaches the signal output PC terminal.

[0050] In another specific embodiment, the present invention provides a method for measuring the mass of a substance using a combination of electromagnetic and optical methods, the method comprising:

[0051] An object of known mass is placed in the oscillating unit, the drive unit is turned on, and the oscillating unit performs elastic simple harmonic motion in the vertical direction. The photoelectric sensor 6 emits a light signal to the oscillating unit, which is reflected by the bottom of the oscillating unit. The frequency detection device collects and analyzes the data to obtain the vibration frequency. By measuring the vibration frequency of multiple known material masses, the mass of the material is compared with the corresponding vibration frequency, and a correlation curve and relationship between the mass of the material and the vibration frequency are fitted. The above operation is repeated for the material to be tested, and its vibration frequency is measured. Based on the obtained correlation curve and relationship, the mass of the material to be tested is obtained.

[0052] Specifically, the steps include the following:

[0053] (I) Place an item of known mass in tray 2, turn on the power of drive circuit 7, the solenoid 5 is energized to generate a magnetic field, attracting the magnetic element 4 to move down, the elastic element 1 is stretched, turn off the power of drive circuit 7, the elastic element 1 is reset, and the tray 2 generates simple harmonic motion in the vertical direction.

[0054] (II) The photoelectric sensor 6 emits a light signal to the bottom of the tray 2. After being reflected by the bottom of the tray 2, the light is detected by the photoelectric sensor 6 and then passed through the photoelectric conversion circuit 8. The data acquisition system 10 then collects the light intensity change and frequency.

[0055] (III) The frequency change of simple harmonic vibration is calculated by the spectrum analysis unit 9. By measuring the frequency of multiple substances with known mass, the correlation curve and relationship between mass and frequency are found.

[0056] (IV) Place the unknown mass of the substance to be tested on tray 2 and carry out the pre-experiment preparation work, such as vacuuming and ventilating. As the reaction occurs, the mass of the substance in tray 2 also changes. Based on the above steps, measure the real-time vibration frequency of the substance to be tested, and obtain the mass of the substance according to the relationship between mass and vibration frequency.

[0057] Application Example 1

[0058] This application example provides a method for measuring the mass of a substance using a combination of electromagnetic and optical methods. Figure 1 The device shown specifically includes:

[0059] (1) Correspond each known mass of the substance to the measured vibration frequency. Since there is a negative correlation between the mass of the substance and the vibration frequency, and the vibration frequency is consistent with the frequency of light intensity change, it can be concluded that the mass of the substance and the frequency of light intensity change are negatively correlated. Therefore, the following plot is drawn. Figure 3 From the mass-light intensity frequency curve, the fitting equation is obtained: y = 0.3666x 2 -8.7483x+50.394(R 2 =0.9991), where y is the mass and x is the frequency of light intensity change. The fitted relationship was then verified by performing measurements again.

[0060] (2) Place a substance with a mass of 35.1698g onto tray 2 in fixed container 11. Turn on the power to drive circuit 7. The solenoid coil 5 is energized to generate a magnetic field, attracting magnetic element 4 to move downwards, stretching elastic element 1. Turn off the power to drive circuit 7, and elastic element 1 resets, causing tray 2 to generate simple harmonic vibration in the vertical direction. Then, photoelectric sensor 6 emits a light signal to the bottom of tray 2. After reflection from the bottom of tray 2, the light is absorbed by photoelectric sensor 6 and then passes through photoelectric conversion circuit 8 (e.g., ...). Figure 2 As shown in the figure, the light intensity changes and frequency are collected by the data acquisition system 10.

[0061] (3) The spectrum analysis unit 9 analyzes the circuit, and its measurement frequency is f = 1.89 Hz. After verification by the relational formula, the mass obtained is 35.169 g, which is close to the actual measured mass data of the substance.

[0062] This invention utilizes the principle that the natural vibration frequency of an elastomer is related to its mass. By using a photoelectric sensor to detect the natural vibration frequency of the elastomer, the mass of the elastomer can be calculated, enabling online real-time measurement of mass changes in materials. The device has a simple structure, low manufacturing cost, is easy to install, debug, use, and maintain, and has good accuracy, making it widely applicable.

[0063] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A device for measuring the mass of a substance using a combination of electromagnetic and optical methods, characterized in that, The device includes a fixed container, an oscillation unit, a photoelectric sensor, a photoelectric conversion circuit, a frequency detection device, and a drive unit. The fixed container houses the oscillation unit, the drive unit, and the photoelectric sensor. The oscillation unit is suspended from the top surface inside the fixed container. The drive unit is located below the oscillation unit. The photoelectric sensor is connected to the photoelectric conversion circuit and the frequency detection device in sequence through a hole in the wall of the fixed container. The oscillation unit includes an elastic element and a tray, the tray being suspended below the elastic element, and the oscillation unit generating simple harmonic vibration in the vertical direction under the drive of the driving element. The bottom of the tray has reflective properties; the tray is made of anti-oxidation and anti-corrosion material; the elastic element is a solenoid spring. The photoelectric sensor includes a light-emitting diode and a photodiode; the photoelectric sensor is located between the tray and the driving unit and near the bottom of the tray, and the photoelectric sensor is used to receive the light signal reflected by the tray; The drive unit includes a solenoid coil, a magnetic element, and a drive circuit. The magnetic element is fixed below the tray, and the solenoid coil is electrically connected to the drive circuit. The magnetic element is pasted and fixed at the center position below the tray. The magnetic element is a permanent magnet or a ferromagnetic material.

2. The apparatus according to claim 1, characterized in that, The fixed container is a tubular structure with open ends, and each of the open ends of the fixed container is provided with a detachable and fixed end cap.

3. The apparatus according to claim 1, characterized in that, The frequency detection device includes an electrically connected data acquisition system and a spectrum analysis unit, and is used for analyzing the resonant frequency of the oscillation unit.

4. The apparatus according to claim 3, characterized in that, The data acquisition system includes a plug-in, a signal input module, and an amplification and filtering module connected to the photoelectric conversion circuit. The plug-in is electrically connected to the signal input module, the signal input module is electrically connected to the amplification and filtering module, and the amplification and filtering module is electrically connected to the analog-to-digital conversion module. The signal is converted from analog to digital and then reaches the signal output PC terminal.

5. A method for measuring the mass of a substance using a combination of electromagnetic and optical methods, characterized in that, The method comprises: testing the mass of a substance using the apparatus according to any one of claims 1-3; and the method comprising: An object of known mass is placed in the oscillating unit, the drive unit is turned on, and the oscillating unit performs elastic simple harmonic motion in the vertical direction. The photoelectric sensor emits a light signal to the oscillating unit, which is reflected by the bottom of the oscillating unit. The frequency detection device collects and analyzes the data to obtain the vibration frequency. By measuring the vibration frequency of multiple known masses, the mass of the material is compared with the corresponding vibration frequency, and a correlation curve and relationship between the mass of the material and the vibration frequency are fitted. The above operation is repeated for the material to be tested, and its vibration frequency is measured. Based on the obtained correlation curve and relationship, the mass of the material to be tested is obtained.

6. The method according to claim 5, characterized in that, The method specifically includes the following steps: (I) When an item of known mass is placed in a tray, the power supply of the drive circuit is turned on, the solenoid is energized and generates a magnetic field, which attracts the magnetic element to move down and stretches the elastic element. When the power supply of the drive circuit is turned off, the elastic element resets and the tray generates a simple harmonic motion in the vertical direction. (II) The photoelectric sensor emits a light signal to the bottom of the tray. After being reflected by the bottom of the tray, the light is detected by the photoelectric sensor. Then, after passing through the photoelectric conversion circuit, the light intensity change and frequency are collected by the data acquisition system. (III) The frequency change of simple harmonic vibration is calculated by the spectrum analysis unit. By measuring the frequency of multiple substances with known mass, the correlation curve and relationship between mass and frequency are found. (IV) Place the unknown mass of the substance to be tested on the tray and carry out the pre-experiment preparation work, such as vacuuming and ventilating. As the reaction occurs, the mass of the substance in the tray also changes. Based on the above steps, measure the real-time vibration frequency of the substance to be tested, and obtain the mass of the substance according to the relationship between mass and vibration frequency.

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