High-low humidity step switcher and method for testing performance of humidity sensor

Abstract

The embodiment of the invention provides a high-low humidity step switcher and method for testing the performance of a humidity sensor. The device is applied to the technical field of sensor performance detection and comprises a sealing cylinder, a sealing cover, a sealing plug, a push-out device, a detected humidity sensor and a gas pipeline, the sealing barrel is of a barrel-shaped structure with two through ends, one end of the sealing barrel is buckled with a sealing cover, and the other end is fixedly connected with a sealing plug, so that the sealing barrel forms a closed space; one end of the push-out device is fixedly connected with the sealing cover, and the other end of the push-out device penetrates through the sealing plug and then is connected with a gas pipeline; a detected humidity sensor is mounted on the push-out device; and the gas pipeline is used for pumping out gas in the sealing cylinder or introducing external humidity gas. In this way, the humidity environment can be rapidly switched, the step starting point can be accurately indicated, and therefore the testing efficiency and precision of the tested humidity sensor are effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the field of sensor performance detection, and in particular to a high-low humidity step switcher and method for humidity sensor performance testing. Background Art

[0002] Humidity sensors are widely used in meteorological observation, environmental monitoring, industrial control and other fields. Their dynamic response characteristics directly affect the accuracy and reliability of the measurement results. In order to evaluate the dynamic performance of humidity sensors, a variety of test technologies and solutions have been developed, mainly including humidity bin conversion, frequency response test method and temperature compensation test method.

[0003] However, the common humidity chamber conversion is mainly limited by the long test cycle. It is necessary to wait for the sensor output to reach a stable state before the next test can be carried out, resulting in low test efficiency; the frequency response test faces the problem of complex test equipment and high cost. The need to use equipment such as signal generators and frequency analyzers increases the test cost and operation complexity; the temperature compensation test also has the problem of complex test equipment and high cost. The need to use equipment such as temperature and humidity control boxes increases the test cost and operation complexity.

[0004] Therefore, the existing humidity sensor dynamic response test method has limitations in test efficiency and accuracy. In order to more comprehensively and accurately evaluate the dynamic performance of humidity sensors, it is necessary to develop a humidity sensor measurement device and method that can achieve rapid switching of humidity environments and accurately indicate the starting point of the step to improve test efficiency and accuracy. Summary of the invention

[0005] The present invention provides a high-low humidity step switcher and method for humidity sensor performance testing, which solves the technical problems of low efficiency and poor accuracy of existing humidity sensor performance testing methods.

[0006] According to a first aspect of the present disclosure, there is provided a high-low humidity step switcher for humidity sensor performance testing, comprising: a sealing cylinder, a sealing cover, a sealing plug, a pushing device, a humidity sensor to be measured, and a gas pipeline;

[0007] The sealing cylinder is a cylindrical structure with two ends connected. One end of the sealing cylinder is buckled with the sealing cover and the other end is fixedly connected to the sealing plug, so that the sealing cylinder forms a closed space;

[0008] The ejection device is installed along the axis of the sealing cylinder, and one end is fixedly connected to the sealing cover, and the other end passes through the sealing plug and is connected to the gas pipeline; the humidity sensor to be measured is installed on the ejection device;

[0009] The gas pipeline is used to extract the gas inside the sealing tube or introduce external humidity gas into the sealing tube; when the sealing cover is sealed and connected to the sealing tube, the humidity sensor to be measured is subjected to the first humidity excitation inside the sealing tube; when the pushing device pushes the sealing cover out, the humidity sensor to be measured receives the second humidity excitation outside the sealing tube.

[0010] According to the above aspects and any possible implementation, there is further provided an implementation, wherein the ejection device includes a push rod, a transmitter compartment, and a spring;

[0011] The push rod is hollow inside, one end of which passes through the sealing cover and is fixedly connected to the sealing cover, and the other end extends to the outside of the sealing plug and is fixedly connected to the gas pipeline; the transmitter compartment and the spring are respectively fixedly sleeved on the push rod;

[0012] The transmitter compartment comprises an inner compartment and a sliding base which are connected to each other; the inner compartment is in gas communication with the push rod, and the sliding base is slidably connected with the inner wall of the sealing cylinder; the spring is compressed and connected between the sliding base and the inner side of the sealing plug;

[0013] The humidity sensor to be measured is installed on the push rod near the sealing cover.

[0014] According to the above aspects and any possible implementation, there is further provided an implementation, wherein a sleeve is fixedly connected to the outer side of the sealing plug, and the other end of the push rod extends to the outer side of the sleeve and is fixedly connected to the gas pipeline;

[0015] A spring limiting block is arranged on the push rod outside the sleeve, and the sleeve is provided with a limiting hole matched with the spring limiting block, so as to limit the stroke of the push rod.

[0016] According to the above aspects and any possible implementation, an implementation is further provided, in which an air hole is provided on the push rod inside the inner chamber for achieving gas communication between the inner chamber and the push rod.

[0017] According to the above aspects and any possible implementation, there is further provided an implementation, wherein the gas pipeline includes an air pump and an air pipe, and the other end of the push rod is connected to the air pump and the air pipe in sequence.

[0018] According to the aspects described above and any possible implementation method, an implementation method is further provided, which also includes a reed step switch assembly, and the reed step switch assembly includes a first reed and a second reed; the first reed is fixed on the inner surface of the sealing cover, and the second reed is installed on the outer surface of the sealing tube, and when the sealing cover is buckled with the sealing tube, the first reed and the second reed are in contact and connected in series with the low-voltage circuit.

[0019] According to a second aspect of the present disclosure, a high-low humidity step switching method for humidity sensor performance testing is provided, the method comprising the following steps:

[0020] S1. Install the high and low humidity step switcher and extract the gas inside it;

[0021] S2, transferring the high-low humidity step switcher to the first humidity environment, and after the measured humidity sensor is stimulated by the first humidity and the output is stable, transferring the high-low humidity step switcher to the second humidity environment;

[0022] S3, exposing the humidity sensor to the second humidity through the high-low humidity step switch and generating a step output by being stimulated by the second humidity;

[0023] S4. Calculate the dynamic response time of the humidity sensor under test when the humidity step switches from the first humidity to the second humidity according to the step output, and perform performance test and evaluation according to the dynamic response time.

[0024] According to the above aspects and any possible implementation, an implementation is further provided.

[0025] The step S1 comprises:

[0026] The sealing cover is buckled onto the sealing cylinder, and the reed step switch assembly is closed, so that the low-voltage circuit is connected and a short-circuit signal is generated;

[0027] The air pump is started to extract the moisture in the sealing cylinder before measurement, thereby completing initialization.

[0028] According to the above aspects and any possible implementation, an implementation is further provided.

[0029] The step S2 comprises:

[0030] The high-low humidity step switcher is placed in a first humidity environment, and the sealing cover is pushed out by a pushing device or the external humidity gas of the first environment is input into the high-low humidity step switcher through the gas pipeline;

[0031] After the measured reading of the measured humidity sensor reaches the first humidity, the high and low humidity step switch is reset and quickly transferred to the second humidity environment;

[0032] The step S3 comprises:

[0033] The high-low humidity step switch is placed in a second humidity environment, the sealing cover is pushed out by a pushing device, and the first environment humidity gas in the sealing tube is simultaneously extracted to the outside of the sealing tube through the gas pipeline, and the step signal of the circuit break generated when the reed step switch component (7) is disconnected from the low-voltage circuit is recorded, as well as the time domain signal of the humidity sensor (5) measured from the first humidity during the second humidity period.

[0034] According to the above aspects and any possible implementation, an implementation is further provided, wherein step S4 includes:

[0035] A humidity-time step curve of the humidity sensor under test is plotted according to the step signal and the time signal, a time constant of the sensor is calculated according to the humidity-time step curve, and the dynamic response performance of the humidity sensor under test is analyzed and judged according to the value of the time constant.

[0036] The present invention discloses the following technical effects:

[0037] (1) The present invention can realize the rapid switching of high and low humidity environments in milliseconds through the rapid ejection mechanism, significantly shorten the response time of the step excitation system itself, reduce dynamic errors, improve test accuracy, and realize the rise or fall of the step signal more quickly;

[0038] (2) The present invention uses a spring reed switch assembly, which can accurately indicate the step starting point, overcome the problem of fuzzy step starting point in the prior art, and improve the accuracy of the test results;

[0039] (3) The present invention can accurately control the humidity and temperature of the test environment through the sealing cylinder and the high (low) humidity gas delivery pipeline to ensure the stability of the test results;

[0040] (4) The device designed by the present invention has a simple structure and a compact size, which saves space and equipment costs. It can be adapted to various large test chambers through modular design and multiple access methods and interfaces, thereby reducing testing costs. It also reduces energy consumption during the test process during rapid switching and precise control, thereby reducing operating costs. It can be used in the research and development, production, calibration and performance evaluation of humidity sensors for various industrial categories.

[0041] It should be understood that the contents described in the summary of the invention are not intended to limit the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. The accompanying drawings are used to better understand the present solution and do not constitute a limitation of the present disclosure. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, among which:

[0043] Figure 1 A structure diagram of a high-low humidity step switcher for humidity sensor performance testing according to an embodiment of the present disclosure is shown;

[0044] Figure 2 A flow chart of a high-low humidity step switching method for humidity sensor performance testing according to an embodiment of the present disclosure is shown;

[0045] Description of Figure Numbers:

[0046] 1. Sealing cylinder, 2. Sealing cover, 3. Sealing plug, 4. Ejection device, 41. Push rod, 411. Air hole, 412. Limit block, 42. Transmitter compartment, 421. Inner compartment, 422. Sliding base, 43. Spring, 5. Measured humidity sensor, 6. Gas pipeline, 61. Air pump, 62. Air pipe, 7. Reed step switch assembly. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Please refer to Figure 1 , this embodiment discloses a high-low humidity step switcher for humidity sensor performance testing, comprising: a sealing cylinder 1, a sealing cover 2, a sealing plug 3, a push-out device 4, a humidity sensor to be measured 5, a gas pipeline 6 and a reed step switch assembly 7;

[0050] The sealing tube 1 is a cylindrical structure with two ends through, one end of the sealing tube 1 is buckled with a sealing cover 2, and the other end is fixedly connected to the sealing plug 3, so that a closed space can be formed inside the sealing tube 1; the sealing tube 1 is used to accommodate the humidity sensor 5 to be measured, and can seal high (low) humidity gas under a specific humidity environment to ensure the stability and controllability of the test environment, and the sealing plug 3 is used to seal the initial gas in the sealing tube 1 so that it maintains a certain humidity stability in a short time.

[0051] The sealing cylinder 1 in this embodiment is made of a material that is resistant to low temperatures and has good sealing performance. The interior can effectively isolate the influence of the external environment, and the space is sufficient to accommodate the humidity sensor 5 to be measured and ensure the accuracy of the test results.

[0052] The ejection device 4 is installed along the axis of the sealing tube 1 , and one end is fixedly connected to the sealing cover 2 , and the other end passes through the sealing plug 3 and is connected to the gas pipeline 6 ; the humidity sensor 5 to be measured is installed on the ejection device 4 .

[0053] The pushing device 4 in this embodiment can push the humidity sensor 5 to be measured out of the sealing tube 1 in a very short time, and can effectively ensure that the rising or falling edge of the step signal is steep enough, so as to accurately evaluate the dynamic response characteristics of the humidity sensor 5 to be measured.

[0054] The gas pipeline 6 is used to extract the gas inside the sealing tube 1 or introduce the external humidity gas into the sealing tube 1; when the sealing cover 2 is sealed and connected to the sealing tube 1, the measured humidity sensor 5 is used to detect the first humidity inside the sealing tube 1; when the ejection device 4 ejects the sealing cover 2, the measured humidity sensor 5 is used to detect the second humidity outside the sealing tube 1.

[0055] The gas pipeline 6 of this embodiment is used to generate a specific humidity environment, and can fill high (low) humidity gas into the sealing tube 1 to form a stable high humidity environment. And when the humidity sensor 5 to be measured is quickly pushed out, the gas in the sealing tube 1 is sucked out so that it will not overflow and affect the humidity environment of the step excitation. Moreover, through the delivery pipeline, when the humidity sensor 5 to be measured is quickly pushed out, the design of sucking out the gas in the sealing tube 1 prevents gas from overflowing, which helps to maintain the humidity environment of the step excitation unaffected, reduces external interference, and ensures the accuracy of the test results. This precise control is crucial for the dynamic response test of the humidity sensor 5 to be measured, ensuring the consistency and repeatability of the test conditions.

[0056] The reed step switch assembly 7 includes a first reed and a second reed; the first reed is fixed to the inner surface of the sealing cover 2, and the second reed is installed on the outer surface of the sealing cylinder 1, and when the sealing cover 2 is buckled with the sealing cylinder 1, the first reed and the second reed are in contact and connected in series with the low-voltage circuit.

[0057] The reed step switch assembly 7 of this embodiment is used to quickly pop open when the humidity sensor 5 being measured is pushed out, generating a high-level signal as an accurate indication of the step starting point, overcoming the problem of fuzzy step starting point in the prior art, improving the accuracy of the test results, and facilitating the recording of test data and analysis of test results.

[0058] The high and low humidity step switch of the present invention effectively overcomes the problems of low test efficiency and inaccurate test results in the prior art by adopting technical means such as a sealing cylinder, a high (low) humidity gas delivery pipeline, a quick ejection mechanism, a spring reed switch and a control system, and provides an efficient and accurate solution for the dynamic response test of the humidity sensor being tested, and has broad application prospects.

[0059] Further, the ejection device 4 includes a push rod 41, a transmitter compartment 42 and a spring 43;

[0060] The push rod 41 is hollow inside, one end of which passes through the sealing cover 2 and is fixedly connected to the sealing cover 2, and the other end extends to the outside of the sealing plug 3 and is fixedly connected to the gas pipeline 6; the transmitter compartment 42 and the spring 43 are respectively fixedly sleeved on the push rod 41;

[0061] The transmitter compartment 42 includes an inner compartment 421 and a sliding base 422 which are connected to each other; the inner compartment 421 is in gas communication with the push rod 41, and the sliding base 422 is slidably connected to the inner wall of the sealing cylinder 1; the spring 43 is compressed and connected between the sliding base 422 and the inner side of the sealing plug 3;

[0062] A humidity sensor 5 to be measured is installed on the push rod 41 near the sealing cover 2 .

[0063] Furthermore, a sleeve is fixedly connected to the outside of the sealing plug 3, and the other end of the push rod 41 extends to the outside of the sleeve and is fixedly connected to the gas pipeline 6;

[0064] A spring limit block 412 is provided on the push rod 41 outside the sleeve, and the sleeve is provided with a limit hole matched with the spring limit block 412 for limiting the stroke of the push rod 41.

[0065] Furthermore, an air hole 411 is provided on the push rod 41 inside the inner chamber 421 for achieving gas communication between the inner chamber 421 and the push rod 41; the gas pipeline 6 includes an air pump 61 and an air pipe 62, and the other end of the push rod 41 is connected to the air pump 61 and the air pipe 62 in turn.

[0066] Please refer to Figure 2 This embodiment also provides a high-low humidity step switching method for testing the performance of a humidity sensor under test, comprising the following steps:

[0067] S1. Install the high and low humidity step switcher and extract the gas inside it.

[0068] Specifically, the sealing cover 2 is buckled onto the sealing cylinder 1, and the reed step switch assembly 7 is closed, so that the low-voltage circuit is connected and a short-circuit signal is generated;

[0069] The air pump 61 is started to extract the moisture in the sealing tube 1 before measurement through the air pump 61 to complete the initialization.

[0070] During the initialization process of this embodiment, the host of the humidity sensor 5 to be measured is first placed in the transmitter compartment 42, and the collector of the humidity sensor 5 to be measured is attached to the push rod 41 close to the sealing cover 2; considering that the humidity sensor 5 to be measured is usually located on a measuring arm far away from the transmitter in actual applications, in order to ensure that it can quickly enter the set humidity environment during the step excitation process, the humidity sensor 5 to be measured should be fixed to the front end of the push rod 41.

[0071] Fasten the sealing cover 2 onto the sealing cylinder 1 and connect the low-voltage circuit, and ensure that the sealing cover 3 and the reed step switch assembly 7 at the mouth of the sealing cylinder 1 are closed to form a short-circuit signal to indicate the initial state. The low-voltage circuit in this embodiment is preferably a 5V circuit.

[0072] S2. The high-low humidity step switch is transferred to the first humidity environment. After the humidity sensor 5 receives the first humidity stimulus and the output is stable, the high-low humidity step switch is transferred to the second humidity environment.

[0073] Specifically, the high-low humidity step switch is placed in a first humidity environment, and the sealing cover 2 is pushed out by the ejection device 4 or the external humidity gas of the first environment is input into the high-low humidity step switch through the gas pipeline 6; after the measurement reading of the humidity sensor 5 reaches the first humidity, the high-low humidity step switch is reset and quickly transferred to the second humidity environment.

[0074] In this embodiment, specifically, by configuring the initial humidity, that is, the first humidity environment, so that it can generate the required initial high (low) humidity gas, a temperature and humidity standard box or a dew point generator can be selected to achieve the set initial humidity environment.

[0075] Place the high-low humidity step switcher in a temperature and humidity standard box that has reached the set humidity and stabilized. Start the air pump 61 to inhale air, so that the sealing tube 1 is quickly filled with the initial humidity (first humidity) gas, or connect the device to the dew point generator through the air path to directly input the set initial humidity gas. Observe the signal of the humidity sensor 5 to be measured, and after judging that the humidity in the sealing tube 1 has reached the initial humidity (first humidity) level, manually pull back the push rod 41 to make the sealing cover 2 seal the tube mouth, seal the initial humidity gas (first humidity) in the chamber, and ensure that the reed step switch assembly 7 at the sealing cover 2 and the tube mouth of the sealing tube 1 is closed, and then quickly place the high-low humidity step switcher in the second humidity environment.

[0076] S3. Through the high-low humidity step switch, the humidity sensor 5 is exposed to the second humidity and stimulated by the second humidity to generate a step output.

[0077] The high-low humidity step switcher is placed in a second humidity environment, and the sealing cover 2 is pushed out by the pushing device 4 , while the first environment humidity gas in the sealing tube 1 is pumped out to the outside of the sealing tube 1 through the gas pipeline 6 .

[0078] In this embodiment, specifically, after the device is transferred to the target humidity standard box, the sealing plug 3 of the device is immediately ensured to be closely matched with the operating hole of the standard box to ensure the sealing and stability of the target humidity environment. During the device transfer and sealing process, special attention should be paid to the stability of the environment to avoid humidity fluctuations caused by improper operation, thereby affecting the accuracy of the test results.

[0079] Press the limit block 412, so that the spring 43 pushes the push rod 41, so that the humidity sensor 5 to be measured is quickly ejected and exposed to the target humidity environment. At this time, the spring reeds at the sealing cover 3 and the sealing tube 1 are ejected, and the switch signal changes from short circuit to open circuit, generating a step edge start signal, accurately indicating the starting point of the step excitation.

[0080] At the same time, start the air pump 61 to suck out the initial moisture (first moisture) from the sealing tube 1. This step is intended to remove the initial humidity environment in the sealing tube 1 to prevent it from overflowing and affecting the stability of the second humidity environment. Moreover, the suction action of the air pump 61 will form a negative pressure in the sealing tube 1, thereby prompting the moisture in the second humidity environment to quickly flow into the sealing tube 1 and flow through the measured humidity sensor 5. The suction speed of the air pump 61 can be adjusted to simulate the wind speed changes in the actual environment. By controlling the suction speed of the air pump 61, the measurement of the time constant under different wind speed conditions can be achieved, thereby more comprehensively evaluating the dynamic response characteristics of the measured humidity sensor 5, recording the step signal of the open circuit generated when the reed step switch assembly 7 is disconnected from the low-voltage circuit, and the time domain signal of the measured humidity sensor 5 during the second humidity obtained by the first humidity measurement.

[0081] S4. Calculate the dynamic response time of the humidity sensor 5 when the humidity is switched from the first humidity to the second humidity according to the step output, and perform performance test and evaluation according to the dynamic response time.

[0082] A humidity-time step curve of the humidity sensor 5 is drawn according to the step signal and the time signal, the time constant of the sensor is calculated according to the humidity-time step curve, and the dynamic response performance of the humidity sensor 5 is analyzed and judged according to the value of the time constant.

[0083] In this embodiment, specifically, after the step is completed, an oscilloscope or a data acquisition card is used to simultaneously collect the time domain signal and the switch step signal of the humidity sensor 5 under test. The time domain signal reflects the changing trend of the sensor output over time, while the switch step signal accurately indicates the starting point of the step excitation. The humidity-time step curve of the sensor is drawn according to the switch step signal and the collected time domain signal. The curve intuitively shows the change process of the sensor output over time and its response characteristics to the step excitation. According to relevant standards and specifications, the sensor step curve is analyzed, and parameters such as the time constant of the sensor are calculated. The time constant is an important indicator for evaluating the dynamic response characteristics of the sensor, which reflects the time required for the sensor output to reach 63.2% of the steady-state value. It should be noted that the sampling time should be set according to the time constant of the sensor under test to ensure that the collected data can fully reflect the dynamic response process of the sensor.

[0084] After the test is completed, the air pump 61 and signal sampling are stopped, and the humidity sensor 5 is retracted into the sealing tube 1. The test data is analyzed to evaluate the dynamic response characteristics of the humidity sensor 5, including parameters such as response speed, overshoot, and steady-state error, so as to evaluate its performance and applicability.

[0085] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should be aware that the present disclosure is not limited by the order of the actions described, because according to the present disclosure, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the present disclosure.

[0086] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this document does not limit this.

[0087] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A high and low humidity step switcher for humidity sensor performance testing, characterized in that: include: A sealing cylinder (1), a sealing cover (2), a sealing plug (3), an ejection device (4), a humidity sensor to be measured (5), and a gas pipeline (6); The sealing cylinder (1) is a cylindrical structure with two ends connected. One end of the sealing cylinder (1) is buckled with the sealing cover (2) and the other end is fixedly connected to the sealing plug (3), so that the sealing cylinder (1) forms a closed space; The ejection device (4) is installed along the axis of the sealing cylinder (1), with one end fixedly connected to the sealing cover (2) and the other end passing through the sealing plug (3) and then connected to the gas pipeline (6); the humidity sensor (5) to be measured is installed on the ejection device (4); The gas pipeline (6) is used to extract the gas inside the sealing tube (1) or to introduce external humidity gas into the sealing tube (1); when the sealing cover (2) is sealed and connected to the sealing tube (1), the humidity sensor (5) to be measured is stimulated by the first humidity inside the sealing tube (1); when the pushing device (4) pushes the sealing cover (2) out, the humidity sensor (5) to be measured is stimulated by the second humidity outside the sealing tube (1).

2. The high and low humidity step switcher for humidity sensor performance testing according to claim 1, characterized in that: The ejection device (4) comprises a push rod (41), a transmitter compartment (42) and a spring (43); The push rod (41) is hollow inside, one end of which passes through the sealing cover (2) and is fixedly connected to the sealing cover (2), and the other end of which extends to the outside of the sealing plug (3) and is fixedly connected to the gas pipeline (6); the transmitter compartment (42) and the spring (43) are respectively fixedly sleeved on the push rod (41); The transmitter compartment (42) comprises an inner compartment (421) and a sliding base (422) which are connected to each other; the inner compartment (421) is in gas communication with the push rod (41), and the sliding base (422) is slidably connected to the inner wall of the sealing cylinder (1); the spring (43) is compressed and connected between the sliding base (422) and the inner side of the sealing plug (3); The humidity sensor (5) to be measured is installed on the push rod (41) near the sealing cover (2).

3. The high and low humidity step switcher for humidity sensor performance testing according to claim 2, characterized in that: The outer side of the sealing plug (3) is fixedly connected to a sleeve, and the other end of the push rod (41) extends to the outside of the sleeve and is fixedly connected to the gas pipeline (6); A spring limit block (412) is provided on the push rod (41) outside the sleeve, and the sleeve is provided with a limit hole matched with the spring limit block (412) for limiting the stroke of the push rod (41).

4. The high and low humidity step switcher for humidity sensor performance testing according to claim 3 is characterized in that: An air hole (411) is provided on the push rod (41) inside the inner chamber (421) for achieving gas communication between the inner chamber (421) and the push rod (41).

5. The high and low humidity step switcher for humidity sensor performance testing according to claim 1, characterized in that: The gas pipeline (6) comprises an air pump (61) and an air pipe (62), and the other end of the push rod (41) is connected to the air pump (61) and the air pipe (62) in sequence.

6. The high and low humidity step switcher for humidity sensor performance testing according to claim 5, characterized in that: It also includes a reed step switch assembly (7), the reed step switch assembly (7) including a first reed and a second reed; the first reed is fixed to the inner surface of the sealing cover (2), the second reed is installed on the outer surface of the sealing cylinder (1), and when the sealing cover (2) is buckled with the sealing cylinder (1), the first reed and the second reed are in contact and connected in series with the low-voltage circuit.

7. A high-low humidity step switching method for humidity sensor performance testing, applied to the high-low humidity step switcher for humidity sensor performance testing as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: S1. Install the high and low humidity step switcher and extract the gas inside it; S2, transferring the high-low humidity step switcher to the first humidity environment, and after the measured humidity sensor (5) is stimulated by the first humidity and the output is stable, transferring the high-low humidity step switcher to the second humidity environment; S3, exposing the humidity sensor (5) to a second humidity through the high-low humidity step switch and generating a step output by being stimulated by the second humidity; S4. Calculate the dynamic response time of the humidity sensor (5) when the humidity is switched from the first humidity to the second humidity according to the step output, and perform performance test and evaluation according to the dynamic response time.

8. The high and low humidity step switching method for humidity sensor performance testing according to claim 7, characterized in that: in, The high and low humidity step switcher adopts the high and low humidity step switcher for humidity sensor performance testing as claimed in claim 6; The step S1 comprises: The sealing cover (2) is buckled onto the sealing cylinder (1), and the reed step switch assembly (7) is closed, so that the low-voltage circuit is connected and a short-circuit signal is generated; The air pump (61) is started, and the moisture in the sealing cylinder (1) before measurement is extracted by the air pump (61), thereby completing initialization.

9. The high and low humidity step switching method for humidity sensor performance testing according to claim 7, characterized in that: The step S2 comprises: The high-low humidity step switcher is placed in a first humidity environment, and the sealing cover (2) is pushed out by using a pushing device (4) or the external humidity gas of the first environment is input into the high-low humidity step switcher through the gas pipeline (6); After the measured reading of the humidity sensor (5) reaches the first humidity, the high and low humidity step switch is reset and the environment is quickly transferred to the second humidity environment; The step S3 comprises: The high-low humidity step switch is placed in a second humidity environment, and the sealing cover (2) is pushed out by using the pushing device (4) and the first environment humidity gas in the sealing tube (1) is simultaneously extracted to the outside of the sealing tube (1) through the gas pipeline (6). At the same time, the step signal of the circuit break generated when the reed step switch component (7) is disconnected from the low-voltage circuit, and the time domain signal of the measured humidity sensor (5) during the second humidity period obtained by measuring the first humidity is recorded.

10. The high and low humidity step switching method for humidity sensor performance testing according to claim 9, characterized in that: The step S4 comprises: A humidity-time step curve of the humidity sensor (5) to be measured is drawn according to the step signal and the time signal, a time constant of the sensor is calculated according to the humidity-time step curve, and the dynamic response performance of the humidity sensor (5) to be measured is analyzed and judged according to the value of the time constant.

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