A testing device for a humidity sensor

Abstract

This invention provides a testing device for a humidity sensor, belonging to the technical field of sensor testing, and solves the technical problem of measurement difficulties when testing the response time of humidity sensors at various humidity points. The testing device for a humidity sensor includes a humidity testing housing, a time constant testing chamber, a partition, a humidity sensor, and a release mechanism. The partition is disposed within the inner cavity of the humidity testing housing, and a humidity generator testing chamber is formed between the lower part of the humidity testing housing and the partition. The humidity sensor is disposed within the time constant testing chamber, which is located within the humidity generator testing chamber. The upper surface of the time constant testing chamber abuts against the bottom surface of the partition, thus forming a sealed space within the time constant testing chamber. The quick release mechanism includes a fixing component and a release component, with the release component movably connected to the fixing component.

Description

Technical Field

[0001] This invention relates to the field of sensor testing technology, and in particular to a testing device for a humidity sensor. Background Technology

[0002] With the development of technology, humidity sensors are being used in an increasingly wider range of applications. During the production and research and development phase of humidity sensors, it is necessary to test the response time at various humidity points within a certain temperature range.

[0003] Currently, there are difficulties in measuring the response time of humidity sensors at various humidity points. Summary of the Invention

[0004] The purpose of this invention is to provide a testing device for a humidity sensor, so as to alleviate the technical problem of measurement difficulties when testing the response time of a humidity sensor at various humidity points.

[0005] In a first aspect, the present invention provides a testing device for a humidity sensor, comprising a humidity testing housing, a time constant testing chamber, a partition, a humidity sensor, and a rapid release mechanism;

[0006] The partition is disposed in the inner cavity of the humidity test housing, and a humidity generator test cavity is formed between the lower part of the humidity test housing and the partition.

[0007] The humidity sensor is disposed inside the time constant test chamber, which is located inside the humidity generator test chamber. The upper surface of the time constant test chamber abuts against the bottom surface of the partition, thereby forming a sealed space.

[0008] The quick-release mechanism includes a fixed component and a release component, wherein the release component is movably connected to the fixed component;

[0009] The fixing component of the quick release mechanism is fixed to the humidity test housing, and the release component of the quick release mechanism is fixed to the time constant test chamber. The release component can be released from the fixing component and fall down, so that the time constant test chamber is separated from the partition, and the humidity sensor in the time constant test chamber is in full contact with the humidity generator test chamber.

[0010] Furthermore, the release component includes a release lever, a crossbeam, and a trigger assembly;

[0011] The top of the release rod is fixed to the crossbeam by a nut, and the bottom of the release rod is fixed to the time constant test chamber;

[0012] The trigger assembly is mounted on the fixed component and is used to support the crossbeam so that the crossbeam and the fixed component remain relatively stationary.

[0013] Furthermore, the release lever includes a first release lever and a second release lever;

[0014] The first release rod and the second release rod are respectively fixed to both ends of the crossbeam by nuts.

[0015] Furthermore, the trigger assembly includes a trigger and a button;

[0016] The button is connected to the fixed component by a spring, and the button is provided with a control groove for controlling the trigger;

[0017] The trigger is connected to the fixed component via a pivot, one end of the trigger is located in the control slot, and the other end has a release hook for supporting the crossbeam.

[0018] Pressing the button causes the control slot to rotate one end of the trigger around the shaft, and the release hook at the other end of the trigger retracts to release the crossbeam.

[0019] Releasing the button causes the control slot to rotate one end of the trigger around the pivot, while the release hook at the other end of the trigger springs outward to support the crossbeam.

[0020] Furthermore, the fixing component includes a central rod and a control head;

[0021] The bottom end of the central rod is fixed to the partition plate, and the control head is fixed to the top end of the central rod;

[0022] The control head is provided with a button slot, and the button is located in the button slot;

[0023] The center rod is provided with a trigger groove, and the trigger groove is provided with an opening that matches the release hook. The trigger is located in the trigger groove, and the release hook can spring out or retract at the opening.

[0024] Furthermore, the crossbeam is provided with a through hole, and the central rod passes through the through hole.

[0025] Furthermore, an insulation layer is provided on the partition.

[0026] Furthermore, a cushioning pad is provided on the upper surface of the insulation layer.

[0027] Furthermore, the insulation layer is made of polytetrafluoroethylene (PTFE).

[0028] Furthermore, the time constant test chamber is a cavity structure with an opening at the top.

[0029] A sealing ring is provided at the upper opening of the time constant test chamber, and the sealing ring is made of silicone rubber.

[0030] The test device for a humidity sensor provided by the present invention includes a humidity test outer casing, a time constant test chamber, a partition board, a humidity sensor, and a release mechanism; the partition board is arranged in the inner cavity of the humidity test outer casing, and a humidity generator test chamber is formed between the lower part of the humidity test outer casing and the partition board; the humidity sensor is arranged in the time constant test chamber, the time constant test chamber is located in the humidity generator test chamber, and the upper surface of the time constant test chamber abuts against the bottom surface of the partition board, so that the time constant test chamber forms a sealed space; the quick release mechanism includes a fixed part and a release part, and the release part is movably connected to the fixed part; the fixed part of the quick release mechanism is fixed to the humidity test outer casing, the release part of the quick release mechanism is fixed to the time constant test chamber, and the release part can be released from the fixed part and fall, so that the time constant test chamber is separated from the partition board, and the humidity sensor in the time constant test chamber is in full contact with the humidity generator test chamber.

[0031] By using the test device for a humidity sensor provided by the present invention, the upper surface of the time constant test chamber is tightly abutted against the bottom surface of the partition board by using the release mechanism, so that the humidity sensor is located in the sealed space formed by the partition board and the time constant test chamber; the release part on the release mechanism can be released from the fixed part and fall, thereby driving the time constant test chamber on the release part to be separated from the partition board, so that the humidity sensor in the time constant test chamber is in full contact with the humidity generator test chamber, that is, the humidity sensor quickly enters the humidity generator test chamber from the time constant test chamber, thereby generating a step signal of humidity, and the time constant is recorded by collecting the humidity value of the humidity sensor. The humidity in the humidity generator test chamber is controlled by a dual-pressure humidity generator, and the humidity generator test chamber with known humidity and the humidity sensor with known time constant are used for verification. By comparing the measured time constant of the humidity sensor with the factory time constant of the humidity sensor, the one that meets the conversion time requirement of the time constant test is qualified, so as to facilitate the test of the response time of each humidity point of the humidity sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a sectional view of the test device for a humidity sensor provided by an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the humidity sensor testing device before release in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the humidity sensor testing device after release in an embodiment of the present invention;

[0036] Figure 4 This is a unit step response diagram of a first-order system in an embodiment of the present invention. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The terms "comprising" and "having," and any variations thereof, used in the embodiments of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or devices.

[0039] With the development of technology, humidity sensors are being used in an increasingly wider range of applications. During the production and research and development phase of humidity sensors, it is necessary to test the response time at various humidity points within a certain temperature range.

[0040] Currently, there are difficulties in measuring the response time of humidity sensors at various humidity points.

[0041] To address the above problems, the present invention provides a testing device for a humidity sensor.

[0042] like Figure 1 and Figure 2As shown, the test device for the humidity sensor provided by the embodiment of the present invention includes a humidity test outer casing 1, a time constant test chamber 2, a partition 3, a humidity sensor (not shown in the figure), and a quick release mechanism 5; the partition 3 is disposed in the inner cavity of the humidity test outer casing 1, and a humidity generator test chamber 4 is formed between the lower part of the humidity test outer casing 1 and the partition 3; the humidity sensor is disposed in the time constant test chamber 2, the time constant test chamber 2 is located in the humidity generator test chamber 4, and the upper surface of the time constant test chamber 2 abuts against the bottom surface of the partition 3, so that the time constant test chamber 2 forms a sealed space; the quick release mechanism 5 includes a fixing member 51 and a release member 52, and the release member 52 is movably connected to the fixing member 51; the fixing member 51 of the quick release mechanism 5 is fixed to the humidity test outer casing 1, the release member 52 of the quick release mechanism 5 is fixed to the time constant test chamber 2, and the release member 52 can be released from the fixing member 51 and fall, so that the time constant test chamber 2 is separated from the partition 3, and the humidity sensor in the time constant test chamber 2 is in full contact with the humidity generator test chamber 4.

[0043] By using the test device for the humidity sensor provided by the embodiment of the present invention, the upper surface of the time constant test chamber 2 is tightly abutted against the bottom surface of the partition 3 by using the release mechanism 5, so that the humidity sensor is located in the sealed space formed by the partition 3 and the time constant test chamber 2; the release member 52 on the release mechanism 5 can be released from the fixing member 51 and fall, thereby driving the time constant test chamber 2 on the release member 52 to be separated from the partition 3, so that the humidity sensor in the time constant test chamber 2 is in full contact with the humidity generator test chamber 4, that is, the humidity sensor quickly enters the humidity generator test chamber 4 from the time constant test chamber 2, thereby generating a step signal of humidity, and the time constant is recorded by collecting the humidity value of the humidity sensor. The humidity in the humidity generator test chamber 4 is controlled by a dual-pressure humidity generator, and the humidity generator test chamber 4 with known humidity and the humidity sensor with known time constant are used for verification. By comparing the measured time constant of the humidity sensor with the factory time constant of the humidity sensor, the one that meets the conversion time requirement of the time constant test is qualified, so as to facilitate the test of the response time of each humidity point of the humidity sensor.

[0044] In one possible implementation, the release component 52 includes a release rod 521, a crossbeam 522, and a trigger assembly 523. The top of the release rod 521 is fixed to the crossbeam 522 by a nut, and the bottom of the release rod 521 is fixed to the time constant test chamber 2. The relative fixed position of the crossbeam 522 and the release rod 521 can be adjusted by the nut, so that the time constant test chamber 2 at the bottom of the release rod 521 is pressed against the partition 3, achieving the purpose of forming a sealed space between the time constant test chamber 2 and the partition 3. The trigger assembly 523 is disposed on the fixed component 51. The trigger assembly 523 is used to support the crossbeam 522. The trigger assembly 523 supports the crossbeam 522 through a release hook, so that the crossbeam 522 and the fixed component 51 remain relatively stationary. The release rod 521, which is fixed to the crossbeam 522, keeps the time constant test chamber 2 and the partition 3 pressed against each other.

[0045] In one possible implementation, such as Figure 3 The release rod 521 shown includes a first release rod 521 and a second release rod 521; the first release rod 521 and the second release rod 521 are respectively fixed to both ends of the crossbeam 522 by nuts. With two release rods 521, the two release rods 521 simultaneously generate an upward traction force on the time constant test chamber 2, ensuring that the time constant test chamber 2 maintains good balance when pressed against the partition 3.

[0046] In one possible implementation, the trigger assembly 523 includes a trigger 2531 and a button 5232; the button 5232 is connected to the fixing member 51 by a spring 5233, and the button 5232 is provided with a control groove for controlling the trigger 2531; the middle part of the trigger 2531 is connected to the fixing member 51 by a pivot, one end of the trigger 2531 is located in the control groove, and the other end forms a release hook for supporting the crossbeam 522; by pressing the button 5232, the control groove causes one end of the trigger 2531 to rotate around the pivot, and the release hook at the other end of the trigger 2531 retracts to release the crossbeam 522; by releasing the button 5232, the control groove causes one end of the trigger 2531 to rotate around the pivot, and the release hook at the other end of the trigger 2531 springs out to support the crossbeam 522. By setting spring 5233 and button 5232, when button 5232 is pressed, it drives trigger 2531 to rotate, releasing the hook to retract; and after the pressing stops, spring 5233 drives button 5232 to reset, thereby causing trigger 2531 to rotate in the opposite direction, releasing the hook to spring out, thus completing the release and lifting of time constant test chamber 2.

[0047] In one possible implementation, the fixing component 51 includes a center rod 511 and a control head 512; the bottom end of the center rod 511 is fixed to the partition 3, and the control head 512 is fixed to the top end of the center rod 511; the control head 512 is provided with a button 5232 slot, and the button 5232 is located in the button 5232 slot; the center rod 511 is provided with a trigger 2531 slot, and the trigger 2531 slot is provided with an opening that matches the release hook, and the trigger 2531 is located in the trigger 2531 slot, and the release hook can spring out or retract at the opening. The center rod 511 and control head 512 are used to fix the trigger assembly 523, and by placing the trigger assembly 523 in the button 5232 slot of the control head 512 and the trigger 2531 slot of the center rod 511, the stability of the trigger assembly 523 is improved.

[0048] In one possible implementation, the crossbeam 522 is provided with a through hole (not shown in the figure), through which the center rod 511 passes, which improves the stability of the crossbeam 522 on the center rod 511 and prevents the crossbeam 522 from shifting and slipping unexpectedly.

[0049] In one possible implementation, a heat insulation layer 6 is provided on the partition 3. The heat insulation layer 6 keeps the temperature in the time constant test chamber 2 and the humidity generator test chamber 4 relatively constant. The humidity sensor needs to be tested for time constant within a temperature range of -30 degrees Celsius to 40 degrees Celsius. Therefore, the heat insulation layer 6 can ensure the relative constantness of the test temperature and ensure the test effect.

[0050] In one possible implementation, a buffer pad (not shown in the figure) is provided on the upper surface of the insulation layer 6. The buffer pad is used to cushion the beam 522 and the release rod 521 after they fall.

[0051] In one possible implementation, the insulation layer 6 is made of polytetrafluoroethylene (PTFE), which has the characteristics of low temperature resistance, non-hygroscopicity, and high stability, ensuring the accuracy of test data.

[0052] In one possible implementation, the time constant testing chamber 2 is an open-top cavity structure, and a sealing ring 7 made of silicone rubber is provided at the upper opening of the time constant testing chamber 2. Silicone rubber is resistant to both high and low temperatures and is a good sealing material. The silicone rubber sealing ring 7 presses the time constant testing chamber 2 and the partition 3, which is made of stainless steel, together to form a good sealed environment for the time constant testing chamber 2.

[0053] In one possible implementation, the time constant test chamber 2 can move up and down within a distance of about 30 mm under the action of the crossbeam 522 and the release rod 521.

[0054] In one possible implementation, since humidity is a first-order system, the transfer function of the first-order system is...

[0055] Its input: Right now

[0056] Its output:

[0057] Taking the inverse Laplace transform, we get:

[0058] in The output response is for humidity, where T is the time constant for humidity. The response graph is shown below. Figure 4 As shown, the time required for the output response to reach 63.2% of the total amplitude is the time constant. Meeting the conversion time requirement of the time constant test is considered passing, that is, the output response is considered passing when it reaches 63.2% of the total amplitude.

[0059] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0061] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. All should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A testing device for a humidity sensor, characterized in that, It includes a humidity test housing, a time constant test chamber, a partition, a humidity sensor, and a quick-release mechanism; The partition is disposed in the inner cavity of the humidity test housing, and a humidity generator test cavity is formed between the lower part of the humidity test housing and the partition. The humidity sensor is disposed inside the time constant test chamber, which is located inside the humidity generator test chamber. The upper surface of the time constant test chamber abuts against the bottom surface of the partition, thereby forming a sealed space. The quick-release mechanism includes a fixed component and a release component, wherein the release component is movably connected to the fixed component; The fixing component of the quick release mechanism is fixed to the humidity test housing, and the release component of the quick release mechanism is fixed to the time constant test chamber. The release component can be released from the fixing component and fall down, causing the time constant test chamber to detach from the partition, and the humidity sensor in the time constant test chamber to fully contact the humidity generator test chamber. The release component includes a release rod, a crossbeam, and a trigger assembly. The release rod includes a first release rod and a second release rod. The tops of the first and second release rods are respectively fixed to both ends of the crossbeam by nuts, and the bottom of the release rods is fixed to the time constant test chamber; The trigger assembly is mounted on the fixed component and is used to support the crossbeam so that the crossbeam and the fixed component remain relatively stationary; the trigger assembly includes a trigger and a button. The button is connected to the fixed component by a spring, and the button is provided with a control groove for controlling the trigger; The trigger is connected to the fixed component via a pivot, one end of the trigger is located in the control slot, and the other end has a release hook for supporting the crossbeam. Pressing the button causes the control slot to rotate one end of the trigger around the shaft, and the release hook at the other end of the trigger retracts to release the crossbeam. Releasing the button causes the control slot to rotate one end of the trigger around the pivot, while the release hook at the other end of the trigger springs outward to support the crossbeam.

2. The testing apparatus for the humidity sensor according to claim 1, characterized in that, The fixing component includes a center rod and a control head; The bottom end of the central rod is fixed to the partition plate, and the control head is fixed to the top end of the central rod; The control head is provided with a button slot, and the button is located in the button slot; The center rod is provided with a trigger groove, and the trigger groove is provided with an opening that matches the release hook. The trigger is located in the trigger groove, and the release hook can spring out or retract at the opening.

3. The testing apparatus for the humidity sensor according to claim 2, characterized in that, The crossbeam has a through hole, and the central rod passes through the through hole.

4. The testing apparatus for the humidity sensor according to claim 1, characterized in that, The partition is provided with an insulation layer.

5. The testing apparatus for the humidity sensor according to claim 4, characterized in that, A cushioning pad is provided on the upper surface of the insulation layer.

6. The testing apparatus for the humidity sensor according to claim 4, characterized in that, The insulation layer is made of polytetrafluoroethylene.

7. The testing apparatus for the humidity sensor according to claim 1, characterized in that, The time constant test chamber is a cavity structure with an opening at the top. A sealing ring is provided at the opening of the time constant test chamber, and the sealing ring is made of silicone rubber.

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