Humidity response time measuring method of humidity sensor

Abstract

The invention discloses a humidity response time measuring method for a humidity sensor, and relates to the technical field of humidity sensors, and the method comprises the steps: placing a to-be-measured humidity sensor in a testing environment with a stable humidity environment and a preset environment temperature; the temperature adjusting device is used for adjusting the temperature of the local environment where the to-be-tested humidity sensor is located and then stops, so that the temperature of the sensor deviates from the preset environment temperature of the testing environment. As the humidity response time of the to-be-measured humidity sensor is longer than the temperature response time, when the temperature of the sensor is recovered to the preset environment temperature, the humidity measurement value of the to-be-measured humidity sensor is still in the recovery stage, and the humidity response time can be obtained by fitting the time humidity measurement value in the recovery stage. According to the method, the humidity response time of the humidity sensor to be measured can be quickly and effectively measured, the method is simpler, more feasible and easy to operate, and the measurement time is shorter.

Description

Technical Field

[0001] The present application relates to the technical field of humidity sensors, and in particular to a method for measuring humidity response time of a humidity sensor. Background Art

[0002] Humidity sensors are used to measure ambient humidity and are commonly used in various fields. When humidity sensors enter and exit high-altitude clouds, the ambient humidity generally changes rapidly. Therefore, in the meteorological field, humidity sensors can be driven to cross high-altitude clouds to detect the boundaries of high-altitude clouds, thereby identifying the location and thickness of high-altitude clouds.

[0003] Humidity response time is an important indicator to measure the dynamic measurement performance of humidity sensors, which reflects the ability of humidity sensors to track rapid changes in ambient humidity. The longer the humidity response time of a humidity sensor, the worse its ability to track changes in ambient humidity, and the greater the hysteresis error in the dynamic measurement process. In the meteorological field, when humidity sensors are used to detect high-altitude clouds, a long humidity response time of the humidity sensor will result in a slow increase in the humidity value measured when entering the cloud and a slow decrease in humidity when leaving the cloud. The measured value of ambient humidity cannot accurately reflect the boundary of the high-altitude cloud layer, which will reduce the accuracy of the position and thickness judgment of the high-altitude cloud layer. In addition, the lowest temperature of high-altitude clouds can reach -90°C. The humidity response time of a general humidity sensor increases sharply as the temperature decreases. Therefore, obtaining the humidity response time of a humidity sensor under different temperature conditions is necessary for measuring the dynamic measurement performance of different humidity sensors or correcting the humidity hysteresis error to improve the humidity measurement accuracy.

[0004] At present, the common test method for the humidity response time of the humidity sensor under any temperature condition is: construct two humidity stable environments under the same temperature condition, let the humidity sensor stabilize in one humidity stable environment, and then quickly switch to another humidity stable environment to make the test environment produce a humidity step, and then measure the time it takes for the humidity of the humidity sensor to reach 63.2% of the overall change, which is the humidity response time of the humidity sensor at this temperature. Under this test method, for temperatures above zero, a saturated salt solution or a shunt method is generally used to produce a humidity stable environment, and for low temperature conditions below zero, a dual pressure method or a dew point generation method is generally used to produce a humidity stable environment. However, the lower the temperature condition of the test, the more difficult it is to construct a humidity stable environment. The switching of the humidity stable environment is generally carried out by mechanical or electric switches, etc., and it is required that the humidity environment can quickly return to stability after switching. Patent CN104698135A uses low pressure to achieve a low humidity environment, and controls the pressure to achieve rapid humidity switching, but when the pressure changes, the ambient temperature around the humidity sensor will also change, and the condition of constant temperature throughout the process is not met. The above difficulties lead to the disadvantages of the current humidity response time test method that the test environment is complex to build and the test conditions are strict. Not only is the test difficult, but the accuracy of the test results is also difficult to guarantee. Summary of the invention

[0005] In view of the above problems and technical requirements, this application proposes a humidity response time measurement method of a humidity sensor. The technical solution of this application is as follows:

[0006] A humidity response time measurement method of a humidity sensor, the humidity response time measurement method comprising:

[0007] The humidity sensor to be tested is placed in a test environment with a stable humidity environment and a predetermined ambient temperature T, and the temperature response time of the humidity sensor to be tested is less than the humidity response time;

[0008] In the test environment, a temperature regulating device is used to start from time t0 to complete the temperature regulation of the local environment where the humidity sensor to be measured is located and then stop at time t1;

[0009] After the sensor temperature of the humidity sensor to be tested recovers to the predetermined ambient temperature T at time t2, the humidity response time of the humidity sensor to be tested is obtained by fitting the humidity change curve of the humidity measurement value of the humidity sensor to be tested.

[0010] A further technical solution is to obtain the humidity response time of the humidity sensor to be tested by fitting, including:

[0011] Extract the humidity sensor to be tested in the process of the sensor temperature returning to maintain the predetermined ambient temperature T at [t s Humidity variation curve during the period of t], t>t s≥t2;

[0012] According to [t s The humidity response time of the humidity sensor to be tested is obtained by fitting the humidity change curve within the period [T, ∞] and the humidity stable value U(T,∞) reached by the humidity sensor to be tested.

[0013] A further technical solution is to obtain the humidity response time of the humidity sensor to be tested by fitting, including:

[0014] according to Solve to obtain the humidity response time of the humidity sensor to be tested

[0015] Among them, U(T, t s ) is the humidity sensor to be tested at t s The humidity measurement value at time t, U(T, t) is the humidity measurement value of the humidity sensor to be tested at time t.

[0016] A further technical solution is that the temperature regulating device includes a heating device and a cooling device, and the humidity response time of the humidity sensor to be measured is obtained by fitting, including:

[0017] The local environment where the humidity sensor to be measured is located is heated by a heating device until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, and then the humidity response time of the humidity sensor to be measured under the temperature increase condition is obtained by fitting;

[0018] The cooling device is used to cool the local environment where the humidity sensor to be tested is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, and the humidity response time of the humidity sensor to be tested under the cooling condition is obtained by fitting, and the sensor temperature reached after cooling is not lower than the dew point and frost point of the stable humidity environment.

[0019] A further technical solution is that the humidity sensor to be measured is fixed on the outer cylinder of the sleeve tooling, the temperature adjustment device is fixed on the inner cylinder of the sleeve tooling, the humidity sensor to be measured and the temperature adjustment device are located on different planes of the sleeve tooling along the axial direction, and the distance along the axial direction does not exceed a predetermined distance; controlling the temperature adjustment device to adjust the temperature of the humidity sensor to be measured includes:

[0020] The outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated in the circumferential direction until the humidity sensor to be measured is located in the action area of ​​the temperature adjustment device, and the temperature adjustment device is used to complete the temperature adjustment of the local environment where the humidity sensor to be measured is located and then stop.

[0021] A further technical solution is that controlling the temperature regulating device to regulate the temperature of the humidity sensor to be measured further comprises:

[0022] After the temperature of the local environment where the humidity sensor to be measured is located is adjusted, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated circumferentially until the humidity sensor to be measured leaves the action area of ​​the temperature adjustment device.

[0023] A further technical solution is that the temperature regulating device includes a heating device and a cooling device, and the heating device and the cooling device are respectively fixed on both radial sides of the inner cylinder of the sleeve tooling along the first direction; controlling the temperature regulating device to regulate the temperature of the humidity sensor to be measured also includes:

[0024] After the temperature of the local environment where the humidity sensor to be measured is located is adjusted, the outer cylinder and the inner cylinder of the sleeve tooling are directly rotated circumferentially relative to the humidity sensor to be measured to the second direction for natural temperature recovery; or after the temperature recovery of the humidity sensor to be measured is accelerated by auxiliary means, the outer cylinder and the inner cylinder of the sleeve tooling are then rotated circumferentially relative to the humidity sensor to be measured to the second direction; the second direction is perpendicular to the first direction on the plane.

[0025] A further technical solution is to use auxiliary means to accelerate the temperature recovery of the humidity sensor to be measured, including:

[0026] The outer cylinder and the inner cylinder of the sleeve tooling are rotated relative to each other until the humidity sensor to be measured is located in the second direction, and a ventilation device is used near the position to increase the convection heat exchange of the temperature sensor and shorten the temperature recovery time of the humidity sensor;

[0027] or;

[0028] After the local environment where the humidity sensor to be measured is located is heated by the heating device until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated until the humidity sensor to be measured is located in the action area of ​​the cooling device, and when the temperature of the humidity sensor to be measured is restored to a temperature close to the ambient temperature T by the cooling device, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated until the humidity sensor to be measured leaves the action area of ​​the cooling device;

[0029] or;

[0030] After using the cooling device to cool the local environment where the humidity sensor to be measured is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, the outer cylinder and the inner cylinder of the relatively rotating sleeve tooling are rotated until the humidity sensor to be measured is located in the action area of ​​the heating device, and after using the heating device to restore the temperature of the humidity sensor to be measured to close to the ambient temperature T, the outer cylinder and the inner cylinder of the relatively rotating sleeve tooling are rotated until the humidity sensor to be measured leaves the action area of ​​the heating device.

[0031] A further technical solution is that the humidity response time measurement method further includes:

[0032] Use the temperature sensing function of the humidity sensor to be tested to measure the sensor temperature;

[0033] or,

[0034] The sensor temperature is measured using a temperature sensor installed on the non-sensitive surface of the humidity sensor to be measured.

[0035] A further technical solution is that the test environment is constructed using a humidity generator or a high and low temperature environment test chamber.

[0036] The beneficial technical effects of this application are:

[0037] The present application discloses a humidity response time measurement method for a humidity sensor. The method performs local temperature adjustment on the humidity sensor to be measured so that it deviates from a predetermined ambient temperature and then recovers. When the sensor temperature recovers to the predetermined ambient temperature, since the humidity response time is greater than the temperature response time, the humidity measurement value is still in the recovery stage. The humidity response time can be fitted using the humidity measurement value in the recovery stage. The method can quickly and effectively measure the humidity response time of the humidity sensor to be measured. Moreover, the method does not require the construction of two humidity stable test environments like the traditional method, but only requires one humidity stable test environment. It also does not require waiting for the humidity sensor to be measured to reach a steady state after switching to calculate the humidity response time. Generally, 0.3 to 3 times the response time can complete the measurement, while the traditional method generally requires at least 5 to 10 times the time. Therefore, the measurement time of this method is shorter. In addition, since multiple limiting conditions in the traditional method are weakened, the complexity of the measurement system and the measurement process is reduced, making it simpler, more feasible and easier to operate. In addition, in a high and low temperature box, it is easy to measure the humidity response time of the humidity sensor at low temperatures or even -90°C and under different ventilation speed conditions, while the traditional method is difficult to achieve measurement under low temperature and high wind speed conditions. Therefore, the scope of application of this method is also wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a method flow chart of a humidity response time measurement method according to an embodiment of the present application.

[0039] Figure 2 The present invention is a curve diagram showing changes in the sensor temperature and humidity measurement value of a humidity sensor to be tested during a heating process of a local environment where the humidity sensor to be tested is located in an example.

[0040] Figure 3 The present invention is a graph showing changes in the sensor temperature and humidity measurement value of a humidity sensor to be measured during a cooling process of a local environment where the humidity sensor to be measured is located in an example.

[0041] Figure 4It is a three-view drawing of a sleeve tool used in one embodiment of the present application. DETAILED DESCRIPTION

[0042] The specific implementation of the present application is further described below in conjunction with the accompanying drawings.

[0043] As described in the background technology section, the traditional humidity response time measurement method constructs two stable humidity environments under the same temperature conditions, so that the test environment produces a humidity step to measure the humidity response time. But in fact, when the temperature and humidity of the test environment are stable, as long as the initial measurement value of the humidity sensor is different from the final steady-state value, the measurement value of the humidity sensor will gradually approach the steady-state value over time. It is only necessary to intercept a section of humidity change measurement data when the humidity sensor temperature is consistent with the test environment, and the humidity response time of the humidity sensor can be extracted according to the physical model of the sensor response. The humidity response time measurement method of the present application is designed based on this principle and includes the following steps:

[0044] Step 1, placing the humidity sensor to be tested in a test environment with a stable humidity environment and a predetermined ambient temperature T. In the initial stable state, the sensor temperature of the humidity sensor to be tested is the predetermined ambient temperature T, and the humidity measurement value of the humidity sensor to be tested is the stable humidity environment.

[0045] Since the principle of this application is to adjust the temperature of the humidity sensor to cause the humidity measurement value to deviate from the stable humidity environment, and then use the data from the time when the temperature is restored to the time when the humidity is fully restored to measure the humidity response time of the humidity sensor, the temperature response time of the humidity sensor in this application is less than the humidity response time, and in order to ensure the test accuracy, the temperature response time and the humidity response time differ by at least 2 times. Since the humidity sensor to be tested in this application is mainly used in high-altitude humidity detection scenarios, the predetermined ambient temperature T is mainly a low-temperature scenario, and the humidity sensor can basically meet the condition that the temperature response time is less than the humidity response time under low-temperature conditions.

[0046] The test environment is built using a humidity generator or a high and low temperature environmental test chamber. When using a high and low temperature environmental test chamber, the humidity sensor to be tested is placed in the middle area of ​​the high and low temperature environmental test chamber. The temperature and humidity in the middle area of ​​the high and low temperature environmental test chamber can generally remain relatively stable.

[0047] Step 2, in the test environment, the temperature of the local environment where the humidity sensor to be tested is located is adjusted by the temperature adjustment device from time t0 and then stopped at time t1. Since only the local environment where the humidity sensor to be tested is temperature-adjusted, the disturbance of the temperature adjustment on the overall temperature and humidity of the test environment can be ignored within the error range, that is, after the local environment where the humidity sensor to be tested is temperature-adjusted, the ambient temperature and humidity can be quickly restored to the state before the temperature adjustment.

[0048] When the temperature difference between the sensor temperature of the humidity sensor to be measured and the predetermined ambient temperature T reaches a predetermined temperature difference threshold, it indicates that the temperature adjustment is completed. The predetermined temperature difference threshold can be set by user, for example, 10°C.

[0049] When the humidity sensor to be measured has a temperature sensing function, the temperature of the sensor can be measured and determined directly by using the temperature sensing function of the humidity sensor to be measured. When the humidity sensor to be measured does not have a temperature sensing function, it is necessary to additionally install a temperature sensor on the non-sensitive surface of the humidity sensor to be measured, and then use the temperature sensor installed on the non-sensitive surface of the humidity sensor to be measured to measure the sensor temperature. When the temperature sensor is installed on the non-sensitive surface of the humidity sensor to be measured, it can be directly installed on the non-sensitive surface or installed near the non-sensitive surface.

[0050] When the temperature of the local environment where the humidity sensor to be tested is located is adjusted, the humidity sensor to be tested can be heated or cooled. In theory, any one of the temperature adjustment methods can achieve humidity response time measurement. However, in fact, considering that there may be deviations between the humidity response time of the humidity sensor to be tested under heating conditions and the humidity response time under cooling conditions, and in order to reduce errors, heating tests and cooling tests are generally performed on the humidity sensor to be tested respectively. Therefore, in one embodiment, the temperature adjustment device includes a heating device and a cooling device. In an experimental scenario, the heating device is used to heat the local environment where the humidity sensor to be tested is located until the temperature difference with the predetermined ambient temperature T reaches the predetermined temperature difference threshold and then stops. At this time, the change curve of the sensor temperature and humidity measurement value of the humidity sensor to be tested is as shown in FIG. Figure 2 As shown in the figure, the humidity response time of the humidity sensor to be tested under the condition of temperature rise can be fitted in this experimental scenario. In another experimental scenario, the cooling device is used to cool the local environment where the humidity sensor to be tested is located until the temperature difference with the predetermined ambient temperature T reaches the predetermined temperature difference threshold and then stops. At this time, the change curve of the sensor temperature and humidity measurement value of the humidity sensor to be tested is as shown in the figure. Figure 3 As shown in the figure, the humidity response time of the humidity sensor to be tested under cooling conditions can be fitted in this experimental scenario. In the cooling scenario, it is also necessary to ensure that the sensor temperature reached after cooling is not lower than the dew point and frost point of the stable humidity environment to avoid condensation or frost on the surface of the humidity sensor, which will affect the measurement result of the humidity response time.

[0051] Step 3: after the sensor temperature of the humidity sensor to be tested recovers to the predetermined ambient temperature T at time t2, the humidity response time of the humidity sensor to be tested is obtained by fitting the humidity change curve of the humidity measurement value of the humidity sensor to be tested.

[0052] When the temperature adjustment device is used to adjust the temperature of the local environment where the humidity sensor to be measured is located from time t0, the sensor temperature of the humidity sensor to be measured changes rapidly, and the humidity measurement value of the humidity sensor to be measured will also change sharply. After the temperature adjustment is stopped at time t1, the sensor temperature of the humidity sensor to be measured will begin to recover to the state before the temperature change, and the humidity measurement value of the humidity sensor to be measured will also begin to recover to the state before the temperature change. Since the temperature response time of the humidity sensor to be measured is less than the humidity response time, the sensor temperature will first recover to the predetermined ambient temperature T at time t2 and reach stability. Since the humidity response time is longer than its temperature response time, the sensed humidity measurement value has not yet fully recovered to the state before the temperature change at time t2 and is still in the recovery stage. Auxiliary means can also be used to speed up the recovery speed of the temperature sensor and reduce the value of t2.

[0053] Then the humidity sensor to be tested is extracted in the process of the sensor temperature returning to the predetermined ambient temperature T at [t s Humidity variation curve during the period of t]. t>t s ≥t2, that is, the humidity change curve is used from t2 or any time after t2 as the test start time t s In addition, the humidity sensor to be tested has recovered to a stable state or is still in the recovery stage at time t, that is, the present application can intercept t s All or part of the data after the time is used for fitting calculation. For example, only a section of the humidity change curve with a large change in humidity measurement value can be intercepted. Figure 2 In the example, t s After time t2, the humidity measurement value of the humidity sensor to be tested has not reached the humidity stable value at time t. Figure 3 In the example, t s The time is t2, and the humidity measurement value of the humidity sensor to be tested has reached the humidity stable value at t.

[0054] Then according to [t sThe humidity response time of the humidity sensor to be tested is obtained by fitting the humidity change curve in the period of time [t] and the humidity stable value U(T,∞) that the humidity sensor to be tested recovers to. Theoretically, the humidity stable value U(T,∞) that the humidity sensor to be tested recovers to is the stable humidity environment under the initial stable state, but in reality, the humidity sensor to be tested may be offset after temperature adjustment, resulting in the two being not completely consistent, but this does not affect the humidity response time finally measured.

[0055] The physical model of the humidity response process of the humidity sensor can be described by the following formula:

[0056]

[0057] The solution is:

[0058]

[0059] Therefore, when determining the humidity sensor to be tested at t s The humidity measurement value U(T, t s ), the humidity measurement value U(T, t) of the humidity sensor to be tested at time t, and the humidity stability value U(T, ∞), are substituted into the above formula (2) to solve the humidity response time of the humidity sensor to be tested:

[0060] In the traditional method, the time difference between the moment when the humidity measurement value changes by 63.2% and the moment when the test starts is taken as the humidity response time, but it can be seen from the solution formula (2) of the present application that the present application does not need to limit these conditions. In addition, it can also be seen from formula (2) that as long as U(T,∞) remains stable, whether it is equal to the stable humidity environment in the initial stable state does not affect the humidity response time obtained by the solution.

[0061] Using the humidity response time measurement method of the present application, the humidity sensor to be tested is tested at a predetermined ambient temperature T = -40 ° C and a predetermined ambient temperature T = -58 ° C, respectively, and each humidity sensor to be tested is tested for repeatability at T = -58 ° C. The test results are as follows:

[0062]

[0063] It can be seen from the results in the above table that the humidity response time measured by the humidity response time measurement method of the present application has a high accuracy.

[0064] In order to facilitate temperature adjustment of the humidity sensor to be measured during the measurement process, in one embodiment, the humidity sensor to be measured and the temperature adjustment device are mounted on the sleeve tooling. Figure 4The three views of the sleeve tooling are shown, wherein the sleeve tooling comprises an outer cylinder 1 and an inner cylinder 2 which are sleeved together and can rotate relative to each other in the circumferential direction, and the sleeve tooling can manually or electrically control the relative rotation between the outer cylinder 1 and the inner cylinder 2.

[0065] The humidity sensor 3 to be measured is fixed on the outer cylinder 1 of the sleeve fixture, and the temperature adjustment device is fixed on the inner cylinder 2 of the sleeve fixture. The humidity sensor 3 to be measured and the temperature adjustment device are located on different planes of the sleeve fixture along the axial direction, and the distance along the axial direction does not exceed a predetermined distance. The predetermined distance is generally small, ensuring that the humidity sensor to be measured and the temperature adjustment device are in a close fit state when they are at the same circumferential position.

[0066] When the temperature regulating device includes a heating device 4 and a cooling device 5, the heating device 4 and the cooling device 5 are respectively fixed on both radial sides of the inner cylinder of the sleeve tooling. In one embodiment, the heating device 4 is implemented by a heating plate, and the cooling device 5 is implemented by a Peltier.

[0067] When the temperature regulating device is needed to regulate the temperature of the humidity sensor 3 to be measured, the outer cylinder 1 and the inner cylinder 2 of the sleeve tooling are relatively rotated circumferentially until the humidity sensor to be measured is located in the action area of ​​the temperature regulating device, for example, until the humidity sensor to be measured and the temperature regulating device are located at the same circumferential position. Then, the temperature regulating device is started and stops after the temperature regulation of the local environment where the humidity sensor to be measured is completed.

[0068] When the temperature regulating device is small in size, the thermal recovery time of the temperature regulating device itself is very fast, and the impact on the humidity sensor to be measured is small after stopping working. Therefore, the humidity sensor to be measured can directly stay in the action area of ​​the temperature regulating device to recover its state.

[0069] However, when the temperature regulating device is large in size, the thermal recovery time of the temperature regulating device itself is long, and the temperature of the temperature regulating device itself cannot be quickly restored after stopping working. In order to avoid the influence of the temperature regulating device on the humidity sensor to be measured, in another embodiment, after the temperature regulation of the local environment where the humidity sensor to be measured is located is completed, the outer cylinder and the inner cylinder of the sleeve tooling are rotated circumferentially relative to each other until the humidity sensor to be measured leaves the effective area of ​​the temperature regulating device.

[0070] based on Figure 4 In this fixture structure, the heating device 4 and the cooling device 5 are respectively fixed on both radial sides of the inner cylinder 2 along the first direction, and the outer cylinder 1 and the inner cylinder 2 of the sleeve fixture can be relatively rotated circumferentially until the humidity sensor 3 to be measured is located in the second direction for natural temperature recovery. The second direction is perpendicular to the first direction on the plane, that is, rotated 90° to leave the action area of ​​the temperature adjustment device. Figure 4 (a) is a schematic diagram along the axial direction of the sleeve tooling. Figure 4(b) is a side view along the first direction of the sleeve tooling, Figure 4 (c) is a side view along the second direction of the sleeve tooling.

[0071] In addition, as mentioned above, the greater the difference between the temperature recovery time and the humidity response time of the humidity sensor to be measured, the higher the accuracy, and speeding up the temperature recovery speed of the humidity sensor to be measured can improve the scope of application of the method. Therefore, in another embodiment, after the temperature adjustment of the local environment where the humidity sensor to be measured is located is completed, the outer cylinder 1 and the inner cylinder 2 of the circumferentially relatively rotating sleeve tooling are located in the temperature auxiliary rapid recovery area to the humidity sensor to be measured 3, and the temperature recovery is accelerated by auxiliary means. After the temperature is close to recovery, the sleeve is relatively rotated circumferentially to make the humidity sensor to be measured 3 located in the second direction. Using auxiliary methods to speed up the temperature recovery of the humidity sensor to be measured is equivalent to reducing the temperature response time of the humidity sensor, which can improve the applicable temperature range of the present measurement method, especially the measurement when the humidity response time is close to the temperature response time.

[0072] There are also two different ways to perform temperature recovery on the humidity sensor 3 to be measured:

[0073] The first approach is to add an additional ventilation device to rotate the outer cylinder 1 and the inner cylinder 2 of the sleeve tooling relative to each other circumferentially until the humidity sensor 3 to be tested leaves the temperature adjustment zone. For example, a typical approach is to locate the humidity temperature sensor in the second direction and arrange a ventilation device near the position to enhance ventilation of the temperature sensor. When the temperature of the humidity sensor returns to the ambient temperature T, the enhanced ventilation can be stopped and then a response time test can be performed.

[0074] Another approach is to directly use a heating device and a cooling device to accelerate the temperature recovery of the humidity sensor without adding an additional ventilation device. When performing a temperature increase measurement, the heating device is used to heat the local environment where the humidity sensor to be measured is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, and then the outer cylinder 1 and the inner cylinder 2 of the relatively rotating sleeve tooling are located until the humidity sensor to be measured is located in the action area of ​​the cooling device. After the temperature of the humidity sensor to be measured is restored to a temperature close to the ambient temperature T by using the cooling device, the outer cylinder 1 and the inner cylinder 2 of the relatively rotating sleeve tooling are rotated until the humidity sensor to be measured leaves the action area of ​​the cooling device. Alternatively, when performing a temperature reduction measurement, the cooling device is used to cool the local environment where the humidity sensor to be measured is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, and then the outer cylinder 1 and the inner cylinder 2 of the relatively rotating sleeve tooling are located until the humidity sensor to be measured is located in the action area of ​​the heating device. After the temperature of the humidity sensor to be measured is restored to a temperature close to the ambient temperature T by using the heating device, the outer cylinder 1 and the inner cylinder 2 of the relatively rotating sleeve tooling are rotated until the humidity sensor to be measured leaves the action area of ​​the heating device.

[0075] The above is only a preferred embodiment of the present application, and the present application is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present application should be considered to be included in the protection scope of the present application.

Claims

1. A method for measuring humidity response time of a humidity sensor, characterized in that: The humidity response time measurement method comprises: Placing the humidity sensor to be tested in a test environment having a stable humidity environment and a predetermined ambient temperature T, wherein the temperature response time of the humidity sensor to be tested is less than the humidity response time; In the test environment, a temperature regulating device is used to regulate the temperature of the local environment where the humidity sensor to be tested is located starting from time t0 and stopping at time t1; After the sensor temperature of the humidity sensor to be tested recovers to the predetermined ambient temperature T at time t2, the humidity response time of the humidity sensor to be tested is obtained by fitting the humidity change curve of the humidity measurement value of the humidity sensor to be tested.

2. The humidity response time measurement method according to claim 1, characterized in that: The fitting to obtain the humidity response time of the humidity sensor to be tested includes: Extract the humidity sensor to be tested in the process of the sensor temperature returning to maintain the predetermined ambient temperature T at [t s Humidity variation curve during the period of t], t>t s ≥t2; According to [t s The humidity response time of the humidity sensor to be tested is obtained by fitting the humidity change curve within the period [T, t] and the humidity stable value U(T,∞) to which the humidity sensor to be tested recovers.

3. The humidity response time measurement method according to claim 2, characterized in that: The fitting to obtain the humidity response time of the humidity sensor to be tested includes: according to Solve to obtain the humidity response time of the humidity sensor to be tested Among them, U(T, t s ) is the humidity sensor to be measured at t s The humidity measurement value at time t, U(T,t) is the humidity measurement value of the humidity sensor to be tested at time t.

4. The humidity response time measurement method according to claim 1, characterized in that: The temperature regulating device includes a heating device and a cooling device, and the fitting to obtain the humidity response time of the humidity sensor to be measured includes: The heating device is used to heat the local environment where the humidity sensor to be tested is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, and then the temperature response time of the humidity sensor to be tested under the temperature increase condition is obtained by fitting; The cooling device is used to cool the local environment where the humidity sensor to be tested is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, and then the temperature response time of the humidity sensor to be tested under the cooling condition is obtained by fitting, and the sensor temperature reached after cooling is not lower than the dew point and frost point of the stable humidity environment.

5. The humidity response time measurement method according to claim 1, characterized in that: The humidity sensor to be measured is fixed on the outer cylinder of the sleeve tooling, the temperature adjustment device is fixed on the inner cylinder of the sleeve tooling, the humidity sensor to be measured and the temperature adjustment device are located on different planes of the sleeve tooling along the axial direction, and the distance along the axial direction does not exceed a predetermined distance; controlling the temperature adjustment device to adjust the temperature of the humidity sensor to be measured includes: The outer cylinder and the inner cylinder of the sleeve tool are relatively rotated circumferentially until the humidity sensor to be measured is located in the action area of ​​the temperature adjustment device, and the temperature is adjusted by the temperature adjustment device to adjust the temperature of the local environment where the humidity sensor to be measured is located, and then the temperature is stopped.

6. The humidity response time measurement method according to claim 5, characterized in that: Controlling the temperature adjustment device to adjust the temperature of the humidity sensor to be measured also includes: After the temperature of the local environment where the humidity sensor to be measured is located is adjusted, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated circumferentially until the humidity sensor to be measured leaves the action area of ​​the temperature adjustment device.

7. The humidity response time measurement method according to claim 6, characterized in that: The temperature regulating device comprises a heating device and a cooling device, wherein the heating device and the cooling device are respectively fixed on both radial sides of the inner cylinder of the sleeve tooling along the first direction; controlling the temperature regulating device to regulate the temperature of the humidity sensor to be measured further comprises: After completing the temperature adjustment of the local environment where the humidity sensor to be measured is located, the outer cylinder and the inner cylinder of the sleeve tooling are directly rotated circumferentially relative to each other so that the temperature of the humidity sensor to be measured is naturally restored to the second direction; or after the temperature recovery of the humidity sensor to be measured is accelerated by auxiliary means, the outer cylinder and the inner cylinder of the sleeve tooling are rotated circumferentially relative to each other so that the humidity sensor to be measured is in the second direction; the second direction is perpendicular to the first direction on the plane.

8. The humidity response time measurement method according to claim 7, characterized in that: The temperature recovery of the humidity sensor to be tested is accelerated by auxiliary means, including: The outer cylinder and the inner cylinder of the sleeve tool are relatively rotated to move the humidity sensor to be measured to a second direction, and a ventilation device is added in the second direction to increase the convective heat exchange of the humidity sensor and shorten the temperature recovery time of the humidity sensor; or; After the local environment where the humidity sensor to be measured is located is heated by the heating device until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated until the humidity sensor to be measured is located in the action area of ​​the cooling device, and the temperature of the humidity sensor to be measured is restored by the cooling device to reach the ambient temperature T, and then the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated until the humidity sensor to be measured leaves the action area of ​​the cooling device; or; After using the cooling device to cool the local environment where the humidity sensor to be measured is located until the temperature difference with the predetermined ambient temperature T reaches a predetermined temperature difference threshold, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated until the humidity sensor to be measured is located in the action area of ​​the heating device, and when the temperature of the humidity sensor to be measured is restored to the ambient temperature T by using the heating device, the outer cylinder and the inner cylinder of the sleeve tooling are relatively rotated until the humidity sensor to be measured leaves the action area of ​​the heating device.

9. The humidity response time measurement method according to claim 1, characterized in that: The humidity response time measurement method further includes: Measuring the temperature of the sensor by utilizing the temperature sensing function of the humidity sensor to be measured; or, The sensor temperature is measured by using a temperature sensor installed on the non-sensitive surface of the humidity sensor to be measured.

10. The humidity response time measurement method according to claim 1, characterized in that: The test environment is constructed using a humidity generator or a high and low temperature environment test chamber.

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