Calibration Device for Rainfall Sensor

Abstract

The present invention discloses a calibration device for a rain sensor. The calibration device for the rain sensor includes a housing and an excitation assembly. The housing is provided with an installation cavity and a detection cavity. The detection cavity is used for placing the rain sensor. The excitation assembly includes a probe, an elastic member, and a driving mechanism. The probe is movably arranged in the detection cavity. The elastic member cooperates with the probe and the housing respectively. The elastic force of the elastic member causes the probe to abut against the sensing area of the rain sensor. At least part of the driving mechanism is arranged in the installation cavity. The driving mechanism is used to excite the probe according to a preset mode, so that the probe strikes the sensing area according to the preset mode. The calibration device for the rain sensor realizes the rapid screening on-site of whether the rain sensor needs to be returned to the factory, thereby shortening the detection cycle of the rain sensor and reducing the detection cost of the rain sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and in particular to a calibration device for a rainfall sensor. Background Art

[0002] What is provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] Rainfall measurement is usually completed by using a rainfall sensor. The rainfall sensor is a single disc-shaped piezoelectric sensor. The piezoelectric sensor measures the impact force of raindrops based on the acoustic effect to achieve the measurement of rainfall (the piezoelectric sensor is located under a dome-shaped stainless steel cover. When raindrops strike the steel cover, sound waves are generated and propagate along the steel cover. The piezoelectric sensor deforms due to mechanical resonance, and the deformation causes an electric field to be generated between the electrodes of the piezoelectric sensor. The amplitude of the electric field is proportional to the impact force and the diameter of the raindrops). Due to the influence of environmental factors, after the piezoelectric sensor is used for a period of time, the piezoelectric coefficient of the piezoelectric sensor will decrease. The decrease in the piezoelectric coefficient will cause errors in the measurement, resulting in the measured value of rainfall drifting and being lower than the actual value.

[0004] In the prior art, it is necessary to regularly send the piezoelectric sensor back to the factory for detection. If the measurement of the piezoelectric sensor drifts, it is necessary to adjust the gain coefficient of the piezoelectric sensor to correct the sensitivity of the piezoelectric sensor. However, the cycle of sending the rainfall sensor with a piezoelectric sensor back to the factory for detection is long and the cost is high. Summary of the Invention

[0005] The purpose of the present invention is to at least solve the problem of how to achieve on-site detection of a rainfall sensor. This purpose is achieved through the following technical solutions:

[0006] The present invention provides a calibration device for a rainfall sensor, and the calibration device for the rainfall sensor includes:

[0007] A housing, the housing is provided with an installation cavity and a detection cavity, and the detection cavity is used for placing a rainfall sensor;

[0008] An excitation assembly, the excitation assembly includes a probe, an elastic member and a driving mechanism. The probe is movably arranged in the detection cavity. The elastic member cooperates with the probe and the housing respectively. The elastic force of the elastic member makes the probe abut against the sensing area of the rainfall sensor. At least part of the driving mechanism is arranged in the installation cavity, and the driving mechanism is used to excite the probe according to a preset mode so that the probe strikes the sensing area according to the preset mode.

[0009] According to the calibration device of the rain sensor of the present invention, when detecting the rain sensor, at the use site of the rain sensor, the rain sensor is arranged in the detection cavity of the housing, the driving mechanism is started and operated in a preset mode. Under the action of the driving mechanism, the probe strikes the sensing area of the rain sensor according to the preset mode. At this time, the data collected by the rain sensor is detected. When the data collected by the rain sensor continuously increases with the continuation of the strike and stops with the stop of the strike, it indicates that the current state of the rain sensor is normal. Otherwise, it indicates that the current state of the rain sensor is abnormal. The rain sensor in the normal state can continue to be used without being sent back to the factory for detection, and the rain sensor in the abnormal state needs to be sent back to the factory for calibration. The calibration device of the rain sensor realizes the rapid screening of whether the rain sensor needs to be sent back to the factory on site, thereby shortening the detection cycle of the rain sensor and reducing the detection cost of the rain sensor.

[0010] In addition, the calibration device of the rain sensor according to the present invention may further have the following additional technical features:

[0011] In some embodiments of the present invention, the driving mechanism includes:

[0012] A controller;

[0013] An electromagnetic coil, the electromagnetic coil is electrically connected to the controller, and the electromagnetic coil can attract the probe to separate the probe from the sensing area.

[0014] In some embodiments of the present invention, the driving mechanism further includes a power supply, and the power supply is arranged in the installation cavity and electrically connected to the controller.

[0015] In some embodiments of the present invention, the power supply is a rechargeable battery, and the charging structure of the rechargeable battery is correspondingly arranged with the charging port of the housing.

[0016] In some embodiments of the present invention, the controller includes:

[0017] A control module, the control module is arranged in the installation cavity;

[0018] A mode selection module, the mode selection module is electrically connected to the control module, and the switching unit of the mode selection module protrudes from the outside of the housing;

[0019] A switch module, the switch module is electrically connected to the control module, and the switch module protrudes from the outside of the housing.

[0020] In some embodiments of the present invention, the controller further includes a display module, which is electrically connected to the control module and is used to display the current state of the calibration device of the rain sensor.

[0021] In some embodiments of the present invention, the detection cavity is located below the installation cavity, and the probe is located directly above the sensing area.

[0022] In some embodiments of the present invention, the elastic member is a return spring.

[0023] In some embodiments of the present invention, the rain sensor is snap-fitted with the side wall of the detection cavity.

[0024] In some embodiments of the present invention, a flexible structure is provided on the side wall of the detection cavity, and the flexible structure is clamped between the rain sensor and the inner wall of the detection cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0026] Figure 1 Schematically shows a schematic structural diagram of a calibration device for a rain sensor according to an embodiment of the present invention;

[0027] Figure 2 is Figure 1 a schematic structural diagram of the calibration device for the rain sensor shown in

[0028] Figure 3 is Figure 1 a schematic structural diagram of the calibration device for the rain sensor shown in

[0029] Figure 4 is Figure 1 a schematic structural diagram of the calibration device for the rain sensor shown in

[0030] Figure 5 is Figure 1 a schematic structural diagram of the calibration device for the rain sensor shown in

[0031] Figure 6 is Figure 1 a cross-sectional view of the calibration device for the rain sensor shown in

[0032] The reference numerals are as follows:

[0033] 100 is a calibration device for a rainfall sensor;

[0034] 10 is the housing;

[0035] 11 is the detection chamber;

[0036] 12 is the installation chamber;

[0037] 13 is the flexible structure;

[0038] 14 is the charging port;

[0039] 20 is the excitation component;

[0040] 21 is the controller;

[0041] 211 is the control module, 212 is the switch module, and 213 is the mode selection module;

[0042] 22 is the electromagnetic coil;

[0043] 23 is the power supply;

[0044] 24 is the probe. Detailed implementation manners

[0045] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0046] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless otherwise clearly specified in the context, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be executed in the particular order described or illustrated, unless the execution order is explicitly stated. It should also be understood that alternative or additional steps may be used.

[0047] Although terms such as first, second, and third may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms do not imply an order or sequence when used in this document. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0048] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inner," "outer," "inside," "outside," "below," "beneath," "above," "over," etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" other elements or features will then be oriented "above" or "over" the other elements or features. Thus, the exemplary term "below" can include both upward and downward orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0049] As Figures 1 to 6 shown, according to an embodiment of the present invention, a calibration device 100 for a rain sensor is provided. The calibration device 100 for a rain sensor includes a housing 10 and an excitation assembly 20. The housing 10 is provided with an installation cavity 12 and a detection cavity 11. The detection cavity 11 is used to place the rain sensor. The excitation assembly 20 includes a probe 24, an elastic member, and a driving mechanism. The probe 24 is movably disposed in the detection cavity 11. The elastic member cooperates with the probe 24 and the housing 10 respectively. The elastic force of the elastic member causes the probe 24 to abut against the sensing area of the rain sensor. At least part of the driving mechanism is disposed in the installation cavity 12. The driving mechanism is used to excite the probe 24 according to a preset mode so that the probe 24 strikes the sensing area according to the preset mode.

[0050] Specifically, when detecting the rain sensor, at the usage site of the rain sensor, the rain sensor is arranged in the detection cavity 11 of the housing 10, the driving mechanism is started and operated in a preset mode. Under the action of the driving mechanism, the probe 24 strikes the sensing area of the rain sensor according to the preset mode. At this time, the data collected by the rain sensor is detected. When the data collected by the rain sensor continuously increases with the continuation of the strike and stops with the stop of the strike, it indicates that the current state of the rain sensor is normal. On the contrary, it indicates that the current state of the rain sensor is abnormal. The rain sensor in the normal state can continue to be used without being sent back to the factory for detection, while the rain sensor in the abnormal state needs to be sent back to the factory for calibration. The calibration device 100 of the rain sensor realizes the rapid screening on-site of whether the rain sensor needs to be sent back to the factory, thereby shortening the detection cycle of the rain sensor and reducing the detection cost of the rain sensor.

[0051] It should be understood that when detecting the rain sensor, the calibration device 100 of the rain sensor and the rain sensor to be detected are placed in the same environment (the placement time is at least one hour) to eliminate the adverse effects brought by temperature differences to the detection process. During the detection process, the rain sensor can be removed from its installation position or not. In the present invention, the rain sensor is not removed, and the calibration device 100 of the rain sensor is directly brought close to the rain sensor, so that the rain sensor enters the detection cavity 11 from the opening on the housing 10. There is no need to disassemble the rain sensor during the detection process, thereby improving the detection speed and the detection efficiency.

[0052] It should be noted that when calibrating the rain sensor, the tester sets the preset detection mode on the calibration device 100 of the rain sensor, starts the calibration device 100 of the rain sensor, and the driving mechanism drives the probe 24 according to the preset mode, so that the probe 24 strikes the sensing area of the rain sensor according to the preset mode to simulate the rain process, thereby ensuring the detection accuracy.

[0053] In addition, usually the rain sensor is calibrated once a year. When the rain sensor may be damaged by external forces or after a storm, it also needs to be calibrated to ensure that the rain sensor is not damaged.

[0054] In addition, in this application, the material of the housing 10 is Nylon 12. This kind of material is light in texture and good in impact resistance, which can effectively guarantee the internal structure.

[0055] It is further understood that the driving mechanism includes a controller 21 and an electromagnetic coil 22. The electromagnetic coil 22 is electrically connected to the controller 21, and the electromagnetic coil 22 can attract the probe 24 to separate the probe 24 from the sensing area. Specifically, the electromagnetic coil 22 and the controller 21 are respectively arranged in the installation cavity 12, and the probe 24 is arranged in the detection cavity 11. When it is necessary to detect the rain sensor, the rain sensor is placed in the detection cavity 11 of the housing 10, so that the probe 24 abuts against the sensing area of the rain sensor. Set the start mode (preset mode) of the calibration device 100 of the rain sensor, start the calibration device 100 of the rain sensor, and the controller 21 energizes and de-energizes the electromagnetic coil 22 according to the preset mode. When the electromagnetic coil 22 is energized, the electromagnetic coil 22 generates a magnetic field and attracts the probe 24. The magnetic force generated by the electromagnetic coil 22 is greater than the elastic force of the elastic member, so that the probe 24 is separated from the sensing area of the rain sensor. When the electromagnetic coil 22 is de-energized, the magnetic field of the electromagnetic coil 22 disappears, and the elastic force of the elastic member tends to make the probe 24 abut against the sensing area of the rain sensor again. Each energization and de-energization of the electromagnetic coil 22 realizes a strike of the probe 24 on the sensing area to simulate the strike of raindrops on the rain sensor. By setting the number of energizations and de-energizations of the electromagnetic coil 22, the duration of rainfall is simulated. In addition, by controlling the frequency of the electromagnetic coil 22, the size of rainfall is simulated.

[0056] It should be understood that the controller 21 controls the energization and de-energization of the electromagnetic coil 22 by sending pulses to the electromagnetic coil 22. Among them, the pulse period determines the frequency of the simulated raindrops. A single pulse is divided into a high-level time (unit: millisecond) and a low-level time (unit: millisecond). The high level makes the electromagnetic coil 22 attract, and the probe 24 moves downward to generate an impact force. The low level makes the electromagnetic coil 22 disconnect, and the probe 24 returns to the initial position under the action of the elastic force of the elastic member.

[0057] In addition, the pulse voltage can be set to three levels: low, medium, and high. The lower the voltage, the slower the pulse attraction speed. The higher the voltage, the faster the pulse attraction speed. The size of the pulse voltage is used to simulate the size of raindrops during rainfall.

[0058] It should be noted that in the present invention, the controller 21 has four working states, which are: idle state, single output, continuous output, and multiple output. Among them, in the working mode of the idle state, the calibration device 100 of the rain sensor does not generate pulses, and the electromagnetic coil 22 does not work; in the working mode of single output, the calibration device 100 of the rain sensor only outputs a group of pulses and stops working after the output is completed; in the working mode of continuous output, the calibration device 100 of the rain sensor continuously outputs pulses; in the working mode of multiple output, the calibration device 100 of the rain sensor can output pulse groups according to the set number of cycles. After the number of cycles is reached, the calibration device 100 of the rain sensor works.

[0059] Further, the driving mechanism further includes a power source 23 which is arranged in the installation cavity 12 and electrically connected to the controller 21. Specifically, the power source 23 provides energy for the operation of the calibration device 100 of the rain sensor, so as to ensure that the electromagnetic coil 22 can obtain the pulse when the probe 24 strikes the rain sensor, thereby ensuring the smooth progress of the detection of the rain sensor.

[0060] In an embodiment of the present invention, the power source 23 is a rechargeable battery, and the charging structure of the rechargeable battery is correspondingly arranged with the charging port 14 of the housing 10. Specifically, the housing 10 is provided with a charging port 14 which is correspondingly arranged with the charging structure of the rechargeable battery located in the installation cavity 12. When the power of the rechargeable battery is insufficient, the charger connector is inserted into the charging port 14 and electrically connected to the charging structure, thereby realizing the energy supply to the rechargeable battery. By setting the power source 23 as a rechargeable battery, the calibration device 100 of the rain sensor is avoided from being restricted by the connection line of the power source 23, thereby improving the convenience of use of the calibration device 100 of the rain sensor.

[0061] In other embodiments, the power source 23 is electrically connected to the power supply system through a connecting line. This real-time mode is applicable to the environment where the on-site has the ability to supply electric energy, thereby being able to reduce the manufacturing cost of the calibration device 100 of the rain sensor.

[0062] Further, the controller 21 includes a control module 211, a mode selection module 213 and a switch module 212. The control module 211 is arranged in the installation cavity 12. The mode selection module 213 is electrically connected to the control module 211. The switching unit of the mode selection module 213 protrudes from the outside of the housing 10. The switch module 212 is electrically connected to the control module 211, and the switch module 212 protrudes from the outside of the housing 10. Specifically, the housing 10 is respectively provided with a first opening and a second opening. The control module 211, the switch module 212 and the mode selection module 213 are respectively arranged in the installation cavity 12 of the housing 10. Among them, the control structure of the switch module 212 protrudes from the housing 10 through the first opening, and the control structure of the mode selection module 213 protrudes from the housing 10 through the second opening. The calibration personnel realize the power on and off of the calibration device 100 of the rain sensor by operating the control structure of the switch module 212, and realize the selection of the preset mode during the calibration process of the calibration device 100 of the rain sensor by operating the control structure of the mode selection module 213.

[0063] It should be noted that a first identifier is provided at the first opening position of the housing 10, and the first identifier is "ON" and "OFF", so as to facilitate the calibration personnel to directly obtain the state of the switch module 212, improving the convenience in the control process. A second identifier is provided at the second opening position of the housing 10, and the second identifier is "1", "2", and "3", so as to facilitate the calibration personnel to directly obtain the state of the mode selection module 213, further improving the convenience in the control process.

[0064] In addition, in the embodiment of the present invention, the mode selection module 213 is a knob structure. When using the mode selection module 213 with a knob structure to switch the mode, after each switch, the calibration device 100 of the rain sensor stops working for 3 seconds, and then enters the set mode to start working, so as to ensure the accuracy of detection.

[0065] Furthermore, the controller 21 further includes a display module, and the display module is electrically connected to the control module 211 for displaying the current state of the calibration device 100 of the rain sensor. Specifically, when the calibration device 100 of the rain sensor is working, the display module displays the current state of the calibration device 100 of the rain sensor, so as to facilitate the calibration personnel to timely and accurately master the current state of the calibration device 100 of the rain sensor, further improving the convenience for the calibration personnel to use.

[0066] It should be noted that the display module can be an indicator light or a display screen, etc.

[0067] Furthermore, the detection chamber 11 is located below the installation chamber 12, and the probe 24 is located directly above the sensing area. Specifically, the detection chamber 11 and the installation chamber 12 are arranged in the vertical direction of the housing 10, and the detection chamber 11 is located directly below the installation chamber 12. The probe 24 is arranged at the top of the detection chamber 11 and can move relative to the detection chamber 11. When the rain sensor needs to be calibrated, the rain sensor is placed in the detection chamber 11, and the sensing area of the rain sensor faces the probe 24. When the rain sensor is installed in place in the detection chamber 11, the probe 24 abuts against the sensing area, so that the moving drive mechanism can drive the probe 24, thereby realizing the hitting of the sensing area, and further realizing the simulation of the raindrop hitting the rain sensor.

[0068] It should be understood that by arranging the probe 24 directly above the sensing area, the convenience of the probe 24 hitting the sensing area is improved, further ensuring the simulation effect.

[0069] Further, the elastic member is a return spring. Specifically, one end of the return spring is engaged with the housing 10, and the other end of the return spring is engaged with the probe 24. When the return spring is in a natural state or a compressed state, the probe 24 abuts against the sensing area of the rain sensor. When the electromagnetic coil 22 is energized to generate magnetism to attract the probe 24, the probe 24 leaves the sensing area. At this time, the return spring undergoes elastic deformation or further elastic deformation. When the electromagnetic coil 22 is de-energized and the magnetism disappears, the return spring restores the elastic deformation, driving the probe 24 to reset and strike on the sensing area, thereby realizing the striking of the rain sensor.

[0070] The structure of the return spring is simple, and the reset effect is good, which can effectively ensure the striking effect of the probe 24 on the rain sensor.

[0071] Further, the rain sensor is snap-fitted with the side wall of the detection cavity 11. Specifically, when the rain sensor is calibrated, the rain sensor is arranged in the detection cavity 11 of the housing 10, and the snap-fit between the rain sensor and the side wall of the detection cavity 11 is used to fix the two, thereby avoiding the situation that the relative displacement between the rain sensor and the housing 10 bracket causes the measurement accuracy to decrease.

[0072] Further, a flexible structure 13 is provided on the side wall of the detection cavity 11, and the flexible structure 13 is clamped between the rain sensor and the inner wall of the detection cavity 11. Specifically, by providing the flexible structure 13, the influence of factors such as vibration outside the housing 10 on the rain sensor during the calibration process is avoided, and the calibration accuracy of the rain sensor is further ensured.

[0073] The following describes the calibration process of the rain sensor by the calibration device 100 of the rain sensor with specific examples:

[0074] When using the calibration device 100 of the rain sensor, it is installed on the top of the rain sensor, so that the rain sensor is arranged in the detection cavity 11, and the calibration device 100 of the rain sensor is kept vertically placed above the rain sensor until its probe 24 touches the sensing area of the rain sensor. After installation, the control structure of the switch module 212 at the top of the calibration device 100 of the rain sensor is turned to the "ON" position to start the calibration device 100 of the rain sensor. If the calibration device 100 of the rain sensor is turned on, the display module of the green indicator light flashes once every second.

[0075] Then, the control structure of the mode selection module 213 is adjusted to position 1 to enter the single-shot output mode, and wait for 3 seconds to start output. Observe the output of the rain sensor. Whether the cumulative rainfall gradually increases. If the cumulative rainfall has an increasing trend during the working time of the electromagnetic coil 22, and the cumulative rainfall stops increasing after the electromagnetic coil 22 stops working, it indicates that the rain sensor is working properly.

[0076] For rain sensors that work normally, there is no need to return them to the factory for inspection. For rain sensors that work abnormally, they need to be returned to the factory for inspection and repair.

[0077] It should be pointed out that the operating temperature range of the calibration device 100 of the rainfall sensor is 5 to 40° C., and the operating wind speed is less than 10 m / s, so as to further ensure the accuracy of the calibration.

[0078] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A calibration device for a rain sensor, characterized in that, the calibration device for the rain sensor includes: a housing, the housing is provided with an installation cavity and a detection cavity, and the detection cavity is used for placing the rain sensor; an excitation assembly, the excitation assembly includes a probe, an elastic member and a driving mechanism, the probe is movably arranged in the detection cavity, the elastic member cooperates with the probe and the housing respectively, the elastic force of the elastic member makes the probe abut against the sensing area of the rain sensor, at least part of the driving mechanism is arranged in the installation cavity, and the driving mechanism is used to excite the probe according to a preset mode so that the probe strikes the sensing area according to the preset mode.

2. The calibration device for the rain sensor according to claim 1, characterized in that, the driving mechanism includes: a controller; an electromagnetic coil, the electromagnetic coil is electrically connected to the controller, and the electromagnetic coil can attract the probe to separate the probe from the sensing area.

3. The calibration device for the rain sensor according to claim 2, characterized in that, the driving mechanism further includes a power supply, the power supply is arranged in the installation cavity and is electrically connected to the controller.

4. The calibration device for the rain sensor according to claim 3, characterized in that, the power supply is a rechargeable battery, and the charging structure of the rechargeable battery is correspondingly arranged with the charging port of the housing.

5. The calibration device for the rain sensor according to claim 2, characterized in that, the controller includes: a control module, the control module is arranged in the installation cavity; a mode selection module, the mode selection module is electrically connected to the control module, and the switching unit of the mode selection module protrudes from the outside of the housing; a switch module, the switch module is electrically connected to the control module, and the switch module protrudes from the outside of the housing.

6. The calibration device for the rain sensor according to claim 5, characterized in that, the controller further includes a display module, the display module is electrically connected to the control module, and is used to display the current state of the calibration device for the rain sensor.

7. The calibration device for the rain sensor according to claim 1, characterized in that, the elastic member is a return spring.

8. The calibration device for the rain sensor according to claim 1, characterized in that, the rain sensor is clamped and matched with the side wall of the detection cavity.

9. The calibration device for the rain sensor according to claim 8, characterized in that, a flexible structure is arranged on the side wall of the detection cavity, and the flexible structure is clamped between the rain sensor and the inner wall of the detection cavity.

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