Liquid level measuring device for liquid nitrogen biological containers

Abstract

The utility model provides a kind of liquid level measuring device of liquid nitrogen biological container, can be applied to liquid level measurement technical field.The liquid level measuring device includes: support;Weight sensing module is set to support bottom, for weighing to be measured container, obtains first liquid level signal;Ultrasonic ranging module is set to support, for measuring the vertical distance between ultrasonic ranging module and the liquid nitrogen surface in to-be-measured container using ultrasonic signal, obtains second liquid level signal;Signal processing module is electrically connected with weight sensing module and ultrasonic ranging module, for processing first liquid level signal and second liquid level signal, obtains the liquid level height of to-be-measured container.

Description

Technical Field

[0001] This utility model relates to the field of liquid level measurement technology, and more specifically, to a liquid level measuring device for a liquid nitrogen biological container. Background Technology

[0002] Liquid nitrogen bioreactors are widely used in biomedical and life science fields for storing biological samples. Sufficient liquid level inside the bioreactor ensures the biological sample is completely submerged in cryogenic liquid nitrogen, preventing irreversible damage such as protein denaturation, cell rupture, or genetic material loss caused by exposure to higher temperatures. Therefore, it is necessary to monitor the liquid level inside the bioreactor to replenish the nitrogen as needed, avoiding over- or under-replenishment due to measurement errors.

[0003] In the process of realizing the concept of this utility model, it was found that the liquid level measurement error in related technologies is relatively large, making it difficult to accurately replenish the liquid level based on the measurement results. Utility Model Content

[0004] In view of this, in order to solve at least one of the technical problems in the prior art, the embodiments of this utility model provide a liquid level measuring device for a liquid nitrogen biological container, which solves the problems of unstable single measurement accuracy and susceptibility to interference, and improves the accuracy and reliability of liquid level measurement.

[0005] This utility model provides a liquid nitrogen biological container liquid level measuring device, including: a support; a weight sensing module, disposed at the bottom of the support, for weighing the container to be tested to obtain a first liquid level signal; an ultrasonic ranging module, disposed on the support, for measuring the vertical distance between the ultrasonic ranging module and the liquid nitrogen surface in the container to be tested using ultrasonic signals to obtain a second liquid level signal; and a signal processing module, electrically connected to the weight sensing module and the ultrasonic ranging module, for processing the first liquid level signal and the second liquid level signal to obtain the liquid level height of the container to be tested.

[0006] According to an embodiment of the present invention, the ultrasonic ranging module includes: an ultrasonic transmitter for transmitting ultrasonic signals to the surface of liquid nitrogen in the container to be measured; and an ultrasonic receiver for receiving a second liquid level signal obtained by reflecting the ultrasonic signals from the liquid nitrogen surface.

[0007] According to an embodiment of the present invention, the bracket includes a first support rod extending in a horizontal direction and a second support rod extending in a vertical direction. One end of the first support rod and one end of the second support rod are connected by a flange. The first support rod is used to mount an ultrasonic transmitter and an ultrasonic receiver.

[0008] According to an embodiment of the present invention, an ultrasonic transmitter is mounted on a first support rod via a first adjusting slider, and an ultrasonic receiver is mounted on the first support rod via a second adjusting slider. The first and second adjusting sliders are used to slide along the first support rod to adjust the distance between the ultrasonic transmitter and the ultrasonic receiver.

[0009] According to an embodiment of the present invention, each of the first and second adjusting sliders is provided with a groove or through hole that slides with the first support rod, such that the distance between the ultrasonic transmitter and the ultrasonic receiver is 10cm to 15cm through sliding.

[0010] According to an embodiment of the present invention, the support is made of titanium alloy, and the first and second adjusting sliders are made of polytetrafluoroethylene.

[0011] According to an embodiment of the present invention, the length of the first support rod is 50cm to 60cm, the length of the second support rod is 100cm to 120cm, and the diameter of both the first and second support rods is 4cm to 6cm.

[0012] According to an embodiment of the present invention, the signal processing module includes: a signal conditioning unit electrically connected to the ultrasonic receiver and the weight sensing module, used to amplify and filter the first liquid level signal and the second liquid level signal; and a microprocessor electrically connected to the signal conditioning unit, used to perform fusion calculation on the amplified and filtered first liquid level signal and the second liquid level signal to obtain the liquid level height of the container to be tested.

[0013] According to an embodiment of the present invention, the weight sensing module includes: a load-bearing tray for placing the container to be tested; and a weight sensor fixed to the bottom of the load-bearing tray for converting the weight of the container to be tested into a first liquid level signal.

[0014] According to an embodiment of the present invention, the shape of the heavy-duty pallet includes a circular groove with a diameter of 20cm to 25cm and a depth of 5cm to 6cm; the weight sensor includes a strain gauge type weight sensor, and there are multiple weight sensors, and the weight sensor is fixed to the heavy-duty pallet by a support structure.

[0015] According to an embodiment of this utility model, a weight sensing module is used to weigh the container under test to obtain a first liquid level signal. At the same time, an ultrasonic signal is used to measure the vertical distance between the ultrasonic ranging module and the liquid nitrogen surface in the container under test to obtain a second liquid level signal. The first and second liquid level signals are sent to a signal processing module for fusion processing to obtain the liquid level height of the container under test. Thus, by simultaneously employing two liquid level measurement principles, namely acoustic reflection ranging and weight sensing, the error of a single measurement method is reduced, the liquid level measurement accuracy is improved, and remote and automatic liquid level measurement of the container under test is realized. This facilitates the replenishment of liquid nitrogen to the container under test based on the liquid level height obtained in real time, thereby improving the safety and reliability of the container storing biological samples. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic block diagram of a liquid level measuring device for a liquid nitrogen biological container according to an embodiment of the present invention is shown.

[0018] Figure 2 A schematic diagram of a liquid nitrogen biological container level measuring device according to an embodiment of the present invention is shown. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0020] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0021] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0022] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0023] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference in the accompanying drawings and are not intended to limit the scope of protection of this utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this utility model.

[0024] Currently, liquid nitrogen biological containers in related technologies are equipped with level measuring instruments to display the current liquid level inside the container. However, during long-term use, measurement deviations may occur due to factors such as low-temperature aging, frost formation, and mechanical wear, which can easily lead to irreparable losses. For example, resistive level measurement is affected by electrode corrosion and low-temperature environments, resulting in unstable measurement accuracy. Similarly, the measurement accuracy of capacitive and ultrasonic level measurements is easily affected by environmental factors (such as mist, temperature, or impurities inside the container), making it difficult to achieve high precision requirements.

[0025] When the measured liquid level is higher than the actual liquid level, it can easily lead to delayed replenishment of liquid nitrogen, causing the stored biological samples to be exposed to a higher temperature environment, which can cause cell rupture, protein denaturation, and other problems, resulting in the failure of the biological samples. Conversely, when the measured liquid level is lower than the actual liquid level, it can easily lead to over-replenishment of liquid nitrogen, which will be wasted due to natural evaporation, increasing the cost of use. At the same time, frequent opening of the liquid nitrogen biological container may also expose the biological samples to room temperature, causing the biological samples to fail.

[0026] In addition, the liquid level measuring instruments of the relevant technologies also have problems such as complicated parameter settings, difficulty in manual operation, and fixed structure, making them difficult to apply to liquid nitrogen biological containers of different sizes and specifications.

[0027] In view of this, the present invention provides a liquid level measuring device for a liquid nitrogen biological container, comprising: a support; a weight sensing module disposed at the bottom of the support for weighing the container to be tested to obtain a first liquid level signal; an ultrasonic ranging module disposed on the support for measuring the vertical distance between the ultrasonic ranging module and the liquid nitrogen surface in the container to be tested using ultrasonic signals to obtain a second liquid level signal; and a signal processing module electrically connected to the weight sensing module and the ultrasonic ranging module for processing the first liquid level signal and the second liquid level signal to obtain the liquid level height of the container to be tested.

[0028] Figure 1 A schematic block diagram of a liquid level measuring device for a liquid nitrogen biological container according to an embodiment of the present invention is shown.

[0029] like Figure 1As shown, the liquid level measuring device includes a bracket 110, a weight sensing module 120, an ultrasonic ranging module 130, and a signal processing module 140.

[0030] According to an embodiment of the present invention, the container to be tested can be a liquid nitrogen biological container for storing biological samples. The weight sensing module 120 is disposed at the bottom of the support 110 and is used to weigh the container to be tested placed on the load-bearing platform of the weight sensing module 120, and convert the total weight of the net weight of the container to be tested and the weight of the liquid nitrogen in the container to be tested into an electrical signal, namely the first liquid level signal x1.

[0031] According to an embodiment of the present invention, the ultrasonic ranging module 130 is mounted on the bracket 110 and is used to measure the vertical distance between the ultrasonic ranging module 130 and the surface of liquid nitrogen in the container to be measured by utilizing the principle of ultrasonic signal reflection ranging, so as to obtain the second liquid level signal x2.

[0032] According to an embodiment of the present invention, the signal processing module 140 is electrically connected to the weight sensing module 120 and the ultrasonic ranging module 130 via a cable, and is used to process the received first liquid level signal x1 and second liquid level signal x2 to obtain the liquid level height of the container to be measured.

[0033] According to an embodiment of the present invention, the signal processing module 140 can calculate the weight of liquid nitrogen in the container under test based on the first liquid level signal x1 and the preset net weight of the container under test, and calculate the first liquid level height corresponding to the weight sensing by combining the volume parameters of the container under test.

[0034] According to an embodiment of the present invention, the signal processing module 140 can calculate the second liquid level height corresponding to the ultrasonic reflection ranging based on the second liquid level signal x2 and the preset vertical distance between the signal processing module 140 and the bottom of the support 110.

[0035] According to an embodiment of this utility model, opening the container to be tested for liquid nitrogen replenishment will bring air from the external environment into the container. Therefore, the mist concentration in the container is related to the number of times liquid nitrogen is replenished. Based on this, the signal processing module 140 can configure corresponding weights for the first liquid level height and the second liquid level height according to the number of times the container to be tested is opened in actual use. Then, according to the configured weights, the first liquid level height and the second liquid level height are weighted and fused to obtain the weight of liquid nitrogen in the container to be tested.

[0036] According to an embodiment of this invention, the weights of the first liquid level and the second liquid level can be determined based on a target mapping table set according to historical data. The target mapping table includes multiple mapping relationships between the number of openings and target weights. The target weights include a first target weight corresponding to the first liquid level and a second target weight corresponding to the second liquid level, and the sum of the first target weight and the second target weight is 1. When the number of times the container under test is opened is low, the fog content inside the container is low. In this case, the second liquid level obtained by ultrasonic reflection ranging is more accurate than the first liquid level obtained by weight sensing. Conversely, when the number of times the container under test is opened is high, the fog content inside the container is high. In this case, the first liquid level obtained by weight sensing is more accurate than the second liquid level obtained by ultrasonic reflection ranging.

[0037] For example: if the container under test is opened less than 5 times, the weight of the first target is determined to be 0.4 and the weight of the second target is determined to be 0.6 from the target mapping table, and the liquid level height H of the container under test is H = 0.4 × x1 + 0.6 × x2. If the container under test is opened more than 15 times, the weight of the first target is determined to be 0.6 and the weight of the second target is determined to be 0.4 from the target mapping table, and the liquid level height H of the container under test is H = 0.6 × x1 + 0.4 × x2.

[0038] According to an embodiment of this utility model, a weight sensing module is used to weigh the container under test to obtain a first liquid level signal. At the same time, an ultrasonic signal is used to measure the vertical distance between the ultrasonic ranging module and the liquid nitrogen surface in the container under test to obtain a second liquid level signal. The first and second liquid level signals are sent to a signal processing module for fusion processing to obtain the liquid level height of the container under test. Thus, by simultaneously employing two liquid level measurement principles, namely acoustic reflection ranging and weight sensing, the error of a single measurement method is reduced, the liquid level measurement accuracy is improved, and remote and automatic liquid level measurement of the container under test is realized. This facilitates the replenishment of liquid nitrogen to the container under test based on the liquid level height obtained in real time, thereby improving the safety and reliability of the container storing biological samples.

[0039] According to an embodiment of this utility model, the weight sensing module includes: a load-bearing tray for placing the container to be tested; and a weight sensor fixed to the bottom of the load-bearing tray for converting the weight of the container to be tested into a first liquid level signal. The weight sensor can be a strain gauge type weight sensor. The load-bearing tray has a circular groove with a diameter of 20cm to 25cm and a depth of 5cm to 6cm. Multiple weight sensors are present, and the weight sensors are fixed to the load-bearing tray by a support structure.

[0040] To further improve the stability and measurement accuracy of the weight sensing module, preferably, a three-angled support structure can be set between the load-bearing tray and the weight sensor. The root of the support structure is fixed to the hollowed-out part in the center of the circular groove of the load-bearing tray, and the three ends of the support structure are respectively fixed to the three weight sensors through anti-slip feet with spherical universal joints.

[0041] Based on this, all three weight sensors are electrically connected to the signal processing module to send their respective generated first liquid level signals to the signal processing module. The signal processing module can calculate three first liquid level heights based on the first liquid level signals from the three weight sensors, and obtain the final first liquid level height based on the average of the three first liquid level heights.

[0042] It should be noted that setting multiple weight sensors is only to further improve the accuracy of the first liquid level height; however, a single weight sensor can also perform the above-mentioned liquid level measurement and achieve the corresponding technical effect.

[0043] According to an embodiment of this utility model, by setting multiple weight sensors, the load-bearing tray can be evenly stressed, and each of the multiple weight sensors can convert the total weight of the net weight of the container under test and the weight of the liquid nitrogen in the container under test into multiple first liquid level signals, which are sent to the signal processing module, thereby improving the reliability of liquid level measurement.

[0044] According to an embodiment of the present invention, the ultrasonic ranging module includes: an ultrasonic transmitter for transmitting ultrasonic signals to the surface of liquid nitrogen in the container to be measured; and an ultrasonic receiver for receiving a second liquid level signal obtained by reflecting the ultrasonic signals from the liquid nitrogen surface.

[0045] According to an embodiment of this invention, an ultrasonic transmitter and an ultrasonic receiver can be encapsulated side-by-side within a cylindrical housing. A magnet (e.g., a neodymium iron boron magnet) can be embedded in the bottom of the housing to magnetically attach to the outer wall of the container under test, allowing the ultrasonic transmitter to emit ultrasonic waves into the container, and the ultrasonic receiver to receive the ultrasonic waves reflected back from the liquid nitrogen surface. A replaceable anti-fog window (e.g., sapphire glass, anti-fog coated glass) can also be installed on the side of the housing near the magnet. The replaceable anti-fog window ensures clear transmission and reception of ultrasonic signals, avoiding measurement deviations caused by frost.

[0046] According to an embodiment of the present invention, the housing is connected to the signal processing module via a low-temperature resistant flexible connecting cable to achieve electrical connection between the ultrasonic transmitter and the ultrasonic receiver and the signal processing module.

[0047] According to an embodiment of this utility model, the ultrasonic ranging module uses the principle of ultrasonic wave reflection to perform non-contact measurement of the liquid level height of the container under test, avoiding the introduction of impurities from the external environment into the container under test, and overcoming the measurement deviation caused by low-temperature aging, frosting, and mechanical wear of the built-in measuring instrument.

[0048] According to an embodiment of the present invention, the bracket includes a first support rod extending in a horizontal direction and a second support rod extending in a vertical direction. One end of the first support rod and one end of the second support rod are connected by a flange. The first support rod is used to mount an ultrasonic transmitter and an ultrasonic receiver.

[0049] According to an embodiment of this utility model, the first support rod and the second support rod can be made of high-strength titanium alloy. Due to the excellent mechanical properties and low-temperature stability of titanium alloy, the bracket can provide support for each module of the entire device, thereby ensuring the relative position stability between each module.

[0050] According to an embodiment of this utility model, one end of the first support rod and one end of the second support rod are connected by a flange to form an "L"-shaped structure. The connection can be fastened with bolts.

[0051] According to an embodiment of this utility model, the length of the first support rod can be 50cm to 60cm, the length of the second support rod can be 100cm to 120cm, and the diameter of both the first and second support rods can be 4cm to 6cm.

[0052] In addition to the aforementioned method of integrating the ultrasonic transmitter and ultrasonic receiver into the housing, an adjustable slider can also be used to fix the ultrasonic transmitter and ultrasonic receiver to the first support rod.

[0053] According to an embodiment of this utility model, an ultrasonic transmitter is mounted on a first support rod via a first adjusting slider, and an ultrasonic receiver is mounted on the first support rod via a second adjusting slider. The first and second adjusting sliders are used to slide along the first support rod to adjust the distance between the ultrasonic transmitter and the ultrasonic receiver. Each of the first and second adjusting sliders has a groove or through hole that slides with the first support rod, allowing the distance between the ultrasonic transmitter and the ultrasonic receiver to be 10cm to 15cm. The first and second adjusting sliders can be made of polytetrafluoroethylene (PTFE).

[0054] According to an embodiment of this utility model, the distance between the ultrasonic transmitter and the ultrasonic receiver is adjusted by the first and second adjusting sliders, which solves the technical problem that the fixed ultrasonic ranging module is limited by the different sizes of the container to be tested. It can adjust the relative position between the ultrasonic transmitter and the ultrasonic receiver according to the actual size of the container to be tested, thereby improving the signal-to-noise ratio of the ultrasonic signal received by the ultrasonic receiver.

[0055] According to an embodiment of the present invention, the signal processing module includes: a signal conditioning unit electrically connected to the ultrasonic receiver and the weight sensing module, used to amplify and filter the first liquid level signal and the second liquid level signal; and a microprocessor electrically connected to the signal conditioning unit, used to perform fusion calculation on the amplified and filtered first liquid level signal and the second liquid level signal to obtain the liquid level height of the container to be tested.

[0056] According to an embodiment of the present invention, the signal conditioning unit can be a rectangular circuit board with dimensions of 6cm×4cm×0.8cm. The circuit board integrates a high-precision operational amplifier and a filter for amplifying and filtering the first liquid level signal and the second liquid level signal.

[0057] According to an embodiment of this utility model, the microprocessor can be an integrated circuit chip with a size of 3cm×3cm. The integrated circuit chip has high-speed data processing capabilities and rich peripheral interfaces, and is used to receive the first liquid level signal and the second liquid level signal after being processed by the signal conditioning unit, and perform fusion calculation to obtain the liquid level height of the container to be tested.

[0058] According to an embodiment of the present invention, the signal processing module further includes a storage unit, which can be an SD card with a capacity of 8-16GB, used to store information such as the size parameters of the container under test.

[0059] According to an embodiment of the present invention, the signal conditioning unit is electrically connected to the weight sensing module and the weight sensing module respectively via wires, and the microprocessor is electrically connected to the signal conditioning unit and the storage unit respectively via wires.

[0060] According to an embodiment of this utility model, the signal processing module further includes an interaction unit, which includes a touch screen and operation buttons. The touch screen can be a rectangular capacitive touchscreen, with a size of 8cm × 6cm and a resolution of 800 × 600, used to display information such as liquid level and operation menus, and supports touch screen operation. The operation buttons can include a power button, a reset button, and an confirmation button. Each button has a diameter of 1.5cm and can be made of silicone material, used to perform operations such as powering on / off, resetting, and function confirmation of the device. The touch screen and operation buttons are electrically connected to the microprocessor via wires.

[0061] According to an embodiment of this utility model, the signal processing module amplifies and filters the first and second liquid level signals obtained from the two measurement methods, and then performs fusion calculation. Based on the environmental parameters of the container under test, the first and second liquid level signals are assigned corresponding weights, thereby improving the robustness and accuracy of liquid level height measurement.

[0062] To better understand the relative positions and connections between the various modules / units in the liquid nitrogen biological container's level measurement device, the following will explain... Figure 2 Further explanation is needed. Figure 2 A schematic diagram of a liquid nitrogen biological container level measuring device according to an embodiment of the present invention is shown.

[0063] like Figure 2 As shown, the support frame of the liquid level measuring device includes a first support rod 111 and a second support rod 112 connected to the first support rod 111 via a flange 113. The first support rod 111 is used to fix the ultrasonic transmitter 133 and the ultrasonic receiver 134. The ultrasonic transmitter 133 is mounted on the first support rod 111 via a first adjusting slider 131, and the ultrasonic receiver 134 is mounted on the first support rod 111 via a second adjusting slider 132.

[0064] The bottom of the second support rod 112 is connected to the signal processing module, which integrates a signal conditioning unit and a microprocessor, and has a touch screen 141 and operation buttons 142 on its surface.

[0065] The weight sensor 121 is located at the bottom of the load-bearing tray 122 and is used to convert the weight of the container to be measured on the load-bearing tray 122 into an electrical signal, namely the first liquid level signal, and send it to the signal processing module.

[0066] The embodiments of the present invention have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the present invention, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A liquid level measuring device for a liquid nitrogen biological container, characterized in that, include: support; A weight sensing module, located at the bottom of the support, is used to weigh the container to be tested and obtain a first liquid level signal. An ultrasonic ranging module, mounted on the bracket, is used to measure the vertical distance between the ultrasonic ranging module and the liquid nitrogen surface in the container under test using ultrasonic signals, thereby obtaining a second liquid level signal. The signal processing module, electrically connected to the weight sensing module and the ultrasonic ranging module, is used to process the first liquid level signal and the second liquid level signal to obtain the liquid level height of the container under test.

2. The apparatus according to claim 1, characterized in that, The ultrasonic ranging module includes: An ultrasonic transmitter is used to emit ultrasonic signals to the surface of liquid nitrogen in the container to be tested. An ultrasonic receiver is used to receive the second liquid level signal obtained by reflecting the ultrasonic signal through the liquid nitrogen surface.

3. The apparatus according to claim 2, characterized in that, The bracket includes a first support rod extending horizontally and a second support rod extending vertically. One end of the first support rod and one end of the second support rod are connected by a flange. The first support rod is used to mount the ultrasonic transmitter and the ultrasonic receiver.

4. The apparatus according to claim 3, characterized in that, The ultrasonic transmitter is mounted on the first support rod via a first adjusting slider, and the ultrasonic receiver is mounted on the first support rod via a second adjusting slider. The first adjusting slider and the second adjusting slider are used to slide along the first support rod to adjust the distance between the ultrasonic transmitter and the ultrasonic receiver.

5. The apparatus according to claim 4, characterized in that, Each of the first and second adjusting sliders has a groove or through hole that slides with the first support rod, so that the distance between the ultrasonic transmitter and the ultrasonic receiver is 10cm to 15cm by sliding.

6. The apparatus according to claim 5, characterized in that, The support is made of titanium alloy, and the first and second adjusting sliders are made of polytetrafluoroethylene.

7. The apparatus according to any one of claims 3-6, characterized in that, The length of the first support rod is 50cm to 60cm, the length of the second support rod is 100cm to 120cm, and the diameter of both the first and second support rods is 4cm to 6cm.

8. The apparatus according to any one of claims 2-6, characterized in that, The signal processing module includes: The signal conditioning unit is electrically connected to the ultrasonic receiver and the weight sensing module, and is used to amplify and filter the first liquid level signal and the second liquid level signal. A microprocessor, electrically connected to the signal conditioning unit, is used to perform fusion calculation on the amplified and filtered first liquid level signal and the second liquid level signal to obtain the liquid level height of the container under test.

9. The apparatus according to any one of claims 1-6, characterized in that, The weight sensing module includes: A load-bearing tray is used to place the container to be tested; A weight sensor, fixed to the bottom of the load-bearing tray, is used to convert the weight of the container to be measured into the first liquid level signal.

10. The apparatus according to claim 9, characterized in that, The shape of the load-bearing tray includes a circular groove, the diameter of which is 20cm to 25cm and the depth of which is 5cm to 6cm. The weight sensor includes a strain gauge type weight sensor, and there are multiple weight sensors, which are fixed to the load-bearing tray by a support structure.

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