Performance improvement method of self-powered humidity sensor detection device

Abstract

The invention discloses a performance improvement method of a self-powered humidity sensor detection device. The system belongs to the technical field of ultrasonic, micro-nano control, electrochemistry and structure intercrossing, and comprises a humidity control system, an ultrasonic excitation system and a sensor system, the humidity control system comprises an airtight box, a humidity control module, a liquid containing cavity, an atomization device, a drying pipe, a connecting hose and an air pump. The ultrasonic excitation system comprises an ultrasonic transducer and an ultrasonic transducer driving circuit; the sensor system comprises a self-powered humidity sensor and a bracket; according to the invention, by exciting ultrasonic waves with different frequencies, sound streams are generated in a closed gas chamber, water molecules in air are driven by using the generated sound streams, and meanwhile, a self-powered humidity sensor is manufactured by using highly hydrophilic materials such as plant fibers and the like; the water absorption rate of the fiber medium in the self-powered humidity sensor can be improved, and the detection performance of the self-powered humidity sensor is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasound, micro-nano manipulation, electrochemistry and structure intersection, and relates to a method for improving the performance of a self-powered humidity sensor detection device; specifically, it relates to a method for improving the performance of a self-powered humidity sensor by using an acoustic field to drive the diffusion rate of water molecules in the air. Background Art

[0002] Self-powered humidity sensor is a sensor that can operate normally without external power supply. Due to its energy saving, long-term stability, low cost and environmental friendliness, it is widely used in cutting-edge technology fields such as Internet of Things technology, environmental monitoring, smart home, medical monitoring and wearable devices.

[0003] Although the application prospects and use conditions of self-powered humidity sensors are significantly better than those of traditional humidity sensors, there are still some problems or defects in self-powered humidity sensors. First, the energy collection efficiency of self-powered humidity sensors is limited by the influence of the environment. If the ambient humidity is too low, it is difficult to generate a stable current inside the self-powered sensor, which will lead to insufficient energy supply for the sensor. Secondly, the reliability and accuracy of self-powered humidity sensors are generally not high, which will cause errors in the measurement results, thus having a serious impact on subsequent research. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to propose a method for improving the performance of a self-powered humidity sensor detection device. The present invention generates acoustic flow in a closed gas chamber by stimulating ultrasonic waves of different frequencies, and uses the generated acoustic flow to drive water molecules in the air. At the same time, a self-powered humidity sensor is made of highly hydrophilic materials such as plant fibers.

[0005] The technical solution of the present invention is: a self-powered humidity sensor detection device according to the present invention; including a humidity control system, an ultrasonic excitation system and a sensor system;

[0006] The humidity control system includes an airtight box, a humidity control module, a liquid containing chamber, an atomizing device, a drying tube, a connecting hose and an air pump;

[0007] The ultrasonic excitation system includes an ultrasonic transducer and an ultrasonic transducer driving circuit;

[0008] The sensor system includes a self-powered humidity sensor and a bracket.

[0009] Furthermore, a liquid containing cavity is arranged on the inner wall of the airtight box, and an atomizing device is arranged in the liquid containing cavity.

[0010] Furthermore, an ultrasonic transducer and brackets on both sides are arranged on the bottom wall of the inner side of the airtight box, and self-powered humidity sensors are arranged on the tops of the brackets on both sides;

[0011] An ultrasonic transducer driving circuit is arranged on the outer wall of the ultrasonic transducer.

[0012] Furthermore, a humidity control module is arranged on the outer wall of one side of the airtight box.

[0013] Furthermore, a drying pipe and an air pump are arranged on the outer wall of one side of the airtight box. One end of the air pump is connected to the airtight box through an arranged connecting hose, and the other end of the air pump is connected to the drying pipe through an arranged connecting hose.

[0014] Furthermore, the connecting hose and the air pump are placed at the bottom end of the outer wall of the airtight box, and the inner diameter of the connecting hose ranges from 10 mm to 50 mm;

[0015] The drying tube is arranged at the bottom end of the rear outer wall of the airtight box.

[0016] Furthermore, the liquid stored in the liquid containing cavity is a conductive solution, including but not limited to an acidic solution, an alkaline solution, and a neutral solution.

[0017] Furthermore, the shape of the airtight box and the liquid containing chamber is one of a cuboid, a cylinder or a cone;

[0018] The material of the airtight box and the liquid containing chamber is a non-hydrophilic material, including but not limited to ceramic, metal or medium organic glass.

[0019] Further, the self-powered humidity sensor includes two electrodes and a hydrophilic fiber dielectric layer;

[0020] The electrode material uses metal wire with a purity of more than 99%;

[0021] The hydrophilic fibers include, but are not limited to, natural fibers, regenerated cellulose fibers or synthetic fibers.

[0022] Furthermore, the performance improvement method of the self-powered humidity sensor detection device has the following operating steps:

[0023] Step (1), adjusting the ambient humidity in the airtight box by means of a humidity control module to simulate humidity conditions in different environments;

[0024] The self-powered humidity sensor is placed on the bracket, the two electrode ends of the self-powered humidity sensor are connected to the electric signal detection unit, and the generated electric signal is collected by the electric signal collection unit;

[0025] Step (2), when the ultrasonic transducer driving circuit is disconnected, the ultrasonic transducer does not perform ultrasonic vibration;

[0026] Step (2), when the ultrasonic transducer driving circuit is turned on, the ultrasonic transducer performs ultrasonic vibration, and the generated sound waves can drive the movement of water molecules suspended in the air in the airtight box, and the speed of the movement of water molecules in the air is adjusted by adjusting the vibration amplitude of the ultrasonic transducer;

[0027] The electric signal generated at this time is collected by the electric signal collection unit.

[0028] The beneficial effects of the present invention are: 1. The present invention has the advantages of low cost, safety, reliability, and environmental friendliness, which gives it a significant advantage in the field of self-powered sensors; 2. By ultrasonically driving water molecules in the environment, the collection efficiency of the self-powered humidity sensor can be effectively improved; 3. The method of using ultrasound to improve the performance of the self-powered humidity sensor is a non-contact driving method, which can reduce the wear of the self-powered humidity sensor, thereby extending the service life of the self-powered humidity sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the self-powered humidity sensor and ultrasonic excitation device in the present invention;

[0031] In the figure, 1 is an airtight box, 2 is a humidity control module, 3 is a liquid holding chamber, 4 is an atomizing device, 5 is a drying tube, 6 is a connecting hose, 7 is an air pump, 8 is a self-powered humidity sensor, 9 is a bracket, 10 is an ultrasonic transducer, and 11 is an ultrasonic transducer driving circuit. DETAILED DESCRIPTION

[0032] The specific technical solutions of the present invention are further described in detail below in conjunction with specific examples.

[0033] As shown in the figure, the self-powered humidity sensor detection device of the present invention uses ultrasound to move water molecules in the air; it includes a humidity control system, an ultrasonic excitation system, and a sensor system;

[0034] The humidity control system comprises: an airtight box 1, a humidity control module 2, a liquid containing chamber 3, an atomizing device 4, a drying tube 5, a connecting hose 6 and an air pump 7;

[0035] The ultrasonic excitation system comprises: an ultrasonic transducer 10 and an ultrasonic transducer driving circuit 11;

[0036] The sensor system comprises: a self-powered humidity sensor 8 and a bracket 9.

[0037] Furthermore, a liquid containing chamber 3 is arranged on the inner wall of the airtight box 1, and an atomizing device 4 is arranged in the liquid containing chamber 3;

[0038] A humidity control module 2 is arranged on the outer wall of one side of the airtight box 1 .

[0039] Furthermore, the liquid stored in the liquid containing cavity 3 is a conductive solution, including but not limited to an acidic solution, an alkaline solution, and a neutral solution.

[0040] Furthermore, the shape of the airtight box 1 and the liquid containing chamber 3 is one of a cuboid, a cylinder or a cone;

[0041] The material of the airtight box 1 and the liquid containing chamber 3 is a non-hydrophilic material, including but not limited to ceramic, metal or organic glass.

[0042] Furthermore, an ultrasonic transducer 10 and brackets 9 on both sides are arranged on the bottom wall of the inner side of the airtight box 1 , and self-powered humidity sensors 8 are arranged on the top ends of the brackets 9 on both sides.

[0043] Furthermore, an ultrasonic transducer 10 is arranged on the bottom wall of the inner side of the airtight box 1 , and an ultrasonic transducer driving circuit 11 is arranged on the outer wall of the ultrasonic transducer 10 .

[0044] Furthermore, it also includes a drying pipe 5 and an air pump 7. One end of the air pump 7 is connected to the airtight box 1 through an installed connecting hose 6, and the other end of the air pump 7 is connected to the drying pipe 5 through an installed connecting hose 6.

[0045] Furthermore, the drying tube 5 is arranged at the bottom end of the rear outer wall of the airtight box 1 .

[0046] The inner diameter of the connecting hose 6 is in the range of 10 mm to 50 mm.

[0047] Furthermore, the self-powered humidity sensor 8 comprises two electrodes and a hydrophilic fiber dielectric layer;

[0048] The electrode material is made of metal wire with a purity of more than 99%;

[0049] The hydrophilic fibers include but are not limited to natural fibers, regenerated cellulose fibers, synthetic fibers, and the like.

[0050] Furthermore, the performance improvement method of the self-powered humidity sensor detection device has the following operating steps:

[0051] (1) Adjust the ambient humidity in the airtight box 1 through the humidity control module 2 to simulate the humidity conditions in different environments;

[0052] The self-powered humidity sensor 8 is placed on the bracket 9. The two electrode ends of the self-powered humidity sensor 8 are connected to an electric signal detection unit, and the generated electric signal is collected by the electric signal collection unit;

[0053] (2) When the ultrasonic transducer driving circuit 11 is disconnected, the ultrasonic transducer 10 does not perform ultrasonic vibration, and the device at this time is equivalent to a traditional humidity sensor detection device;

[0054] (3) When the ultrasonic transducer driving circuit 11 is turned on, the ultrasonic transducer 10 performs ultrasonic vibration, and the generated sound waves can drive the movement of water molecules suspended in the air in the airtight box 1. By adjusting the vibration amplitude of the ultrasonic transducer 10, the speed of the movement of water molecules in the air can be adjusted;

[0055] The electric signal generated at this time is collected by the electric signal collection unit.

[0056] Furthermore, the humidity condition of the self-powered humidity sensor is controlled by a humidity control system; the ultrasound excited by the ultrasound excitation system can drive water molecules in the environment and increase the movement rate of the water molecules.

[0057] Furthermore, the ultrasonic excitation system includes an ultrasonic excitation unit and an ultrasonic excitation unit driving power supply.

[0058] Furthermore, the ultrasonic excitation unit may be an ultrasonic transducer, a ceramic piezoelectric sheet, an interdigital electrode, etc.

[0059] Furthermore, the selected ultrasonic excitation unit is continuously adjustable within its operating frequency range.

[0060] Furthermore, the humidity RH value can be set through the humidity control module 2. If the set value is lower than the ambient humidity in the airtight box 1, the air pump 7 starts to work, and the air in the airtight box 1 is transported to the drying tube 5 through the connecting hose 6, and then the dry gas is transported back to the airtight box 1 through the connecting hose 6, so as to reduce the humidity value. The inner diameter range of the connecting hose 6 is 10mm-50mm, and the wall thickness of the airtight box 1 is 15mm. If the set value is higher than the ambient humidity in the airtight box 1, the atomizing device 4 starts to work. The atomizing device can atomize the conductive solution water stored in the liquid holding chamber 3 into a molecular state and disperse it in the airtight box 1. According to the humidity conditions set by the humidity control module 2, the speed of the deionized water atomization process can be adjusted;

[0061] When the set humidity value is reached, the atomizing device 4 or the air pump 7 stops working;

[0062] The airtight box 1 and the liquid holding chamber 3 are made of non-hydrophilic materials, including but not limited to ceramics, metals, organic glass, etc. Organic glass is selected here. The airtight box 1 is in the shape of a rectangular parallelepiped, and the liquid holding chamber 3 is in the shape of a hollow cylinder. By adjusting the humidity control system, the humidity in the environment can be changed to simulate the working performance of the self-powered humidity sensor 8 in dry, room temperature, humid and other environments.

[0063] The ultrasonic excitation system uses an ultrasonic transducer 10 as an ultrasonic excitation unit. The ultrasonic transducer 10 is connected to an ultrasonic transducer driving power supply. The excited ultrasound generates an acoustic flow field, which can drive the water molecules in the airtight box 1 to move in a certain direction.

[0064] The self-powered humidity sensor 8 is fixed on the top of the ultrasonic transducer through a bracket 9. The self-powered humidity sensor 8 is composed of two electrodes and a hydrophilic fiber medium layer, wherein the electrodes are metal wires with a purity of 99% or more, and the hydrophilic fibers include but are not limited to: natural fibers, regenerated cellulose fibers, synthetic fibers, etc.;

[0065] The distance between the self-powered humidity sensor 8 and the vibration surface of the ultrasonic transducer 10 is λ / 2, where λ=c / f (c is the propagation speed of sound in air, f is the operating frequency of the ultrasonic transducer, and λ is the ultrasonic wave length), and a standing wave sound field can be formed here;

[0066] Since the self-powered humidity sensor 8 has a hydrophilic fiber medium layer, the water absorption rate of the medium layer can be accelerated with the assistance of ultrasound, thereby improving the response speed of the self-powered humidity sensor 8.

Claims

1. A self-powered humidity sensor detection device, characterized in that: Including humidity control system, ultrasonic excitation system and sensor system; The humidity control system comprises an airtight box (1), a humidity control module (2), a liquid containing chamber (3), an atomizing device (4), a drying tube (5), a connecting hose (6) and an air pump (7); The ultrasonic excitation system comprises an ultrasonic transducer (10) and an ultrasonic transducer driving circuit (11); The sensor system comprises a self-powered humidity sensor (8) and a bracket (9).

2. A self-powered humidity sensor detection device according to claim 1, characterized in that: A liquid containing chamber (3) is arranged on the inner wall of the airtight box (1), and an atomizing device (4) is arranged in the liquid containing chamber (3).

3. A self-powered humidity sensor detection device according to claim 1, characterized in that: An ultrasonic transducer (10) and brackets (9) are also arranged on the inner bottom wall of the airtight box (1), and self-powered humidity sensors (8) are arranged on the tops of the brackets (9) on both sides; An ultrasonic transducer driving circuit (11) is arranged on the outer wall of the ultrasonic transducer (10).

4. A self-powered humidity sensor detection device according to claim 1, characterized in that: A humidity control module (2) is arranged on the outer wall of one side of the airtight box (1).

5. A self-powered humidity sensor detection device according to claim 4, characterized in that: A drying pipe (5) and an air pump (7) are also arranged on the outer wall of one side of the airtight box (1); one end of the air pump (7) is connected to the airtight box (1) via an arranged connecting hose (6), and the other end of the air pump (7) is connected to the drying pipe (5) via an arranged connecting hose (6).

6. A self-powered humidity sensor detection device according to claim 5, characterized in that: The connecting hose (6) and the air pump (7) are arranged at the bottom end of the outer wall of the airtight box (1), and the inner diameter of the connecting hose (6) ranges from 10 mm to 50 mm; The drying tube (5) is arranged at the bottom end of the rear outer wall of the airtight box (1).

7. A self-powered humidity sensor detection device according to claim 3, characterized in that: The liquid stored in the liquid containing cavity (3) is a conductive solution, including but not limited to an acidic solution, an alkaline solution, and a neutral solution.

8. A self-powered humidity sensor detection device according to claim 2, characterized in that: The shape of the airtight box (1) and the liquid containing chamber (3) is a rectangular parallelepiped, a cylinder or a cone; The airtight box (1) and the liquid containing chamber (3) are made of non-hydrophilic materials, including but not limited to ceramics, metals or medium organic glass.

9. A self-powered humidity sensor detection device according to claim 1, characterized in that: The self-powered humidity sensor (8) comprises two electrodes and a hydrophilic fiber dielectric layer; The electrode material uses metal wire with a purity of more than 99%; The hydrophilic fibers include, but are not limited to, natural fibers, regenerated cellulose fibers or synthetic fibers.

10. A method for improving the performance of a self-powered humidity sensor detection device according to any one of claims 1 to 9, characterized in that: The operation steps are as follows: Step (1), adjusting the ambient humidity in the airtight box (1) by means of the humidity control module (2) to simulate humidity conditions in different environments; The self-powered humidity sensor (8) is placed on a bracket (9), the two electrode ends of the self-powered humidity sensor (8) are connected to an electrical signal detection unit, and the generated electrical signal is collected by the electrical signal collection unit; Step (2), when the ultrasonic transducer driving circuit (11) is disconnected, the ultrasonic transducer (10) does not perform ultrasonic vibration; Step (3), when the ultrasonic transducer driving circuit (11) is turned on, the ultrasonic transducer (10) performs ultrasonic vibration, and the generated sound waves can drive the movement of water molecules suspended in the air in the airtight box (1), and the speed of the movement of water molecules in the air is adjusted by adjusting the vibration amplitude of the ultrasonic transducer (10); The electric signal generated at this time is collected by the electric signal collection unit.

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