CN110941213A - Non-contact key system - Google Patents
Non-contact key system Download PDFInfo
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- CN110941213A CN110941213A CN201911129592.6A CN201911129592A CN110941213A CN 110941213 A CN110941213 A CN 110941213A CN 201911129592 A CN201911129592 A CN 201911129592A CN 110941213 A CN110941213 A CN 110941213A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
Abstract
The present invention provides a non-contact key system, comprising: a non-contact key, a microprocessor and a microcontroller; the non-contact type key is internally provided with a humidity sensor which is used for detecting the action of a user approaching the non-contact type key, generating a first induction signal and sending the first induction signal to the microprocessor; the microprocessor is used for determining key value information of the non-contact key according to the first sensing signal and transmitting the key value information to the microcontroller; the microcontroller is used for generating an instruction corresponding to the key value information according to the key value information. When the humidity sensor detects the action that a user finger is close to the non-contact key, a signal can be sent to the microprocessor only when the distance between the user finger and the non-contact key reaches a certain value, complete contact is not needed, the effect that the microcontroller sends an instruction without contacting with the key is achieved, the non-contact key is arranged through the humidity sensor, and the problem that the existing non-contact key is easily influenced by an external light source and a heat source is solved.
Description
Technical Field
The invention relates to the technical field of non-contact induction, in particular to a non-contact key system.
Background
Along with the development and progress of society, the intelligent equipment is more and more widely applied in daily life. Currently, intelligent devices (such as elevators, vending machines, automatic teller machines, etc.) usually require contact keys to assist work, and if the contact keys are frequently used, germs are inevitably remained and attached to the contact keys, so that when other people use the contact keys, the contact keys are very likely to carry the germs and further transmit the germs to other people, and the probability of pathogen infection is greatly increased. Especially, the use occasions of intelligent equipment such as hospitals and the like and the use of the contact type keys can greatly increase the risk of cross infection in hospitals. According to the technology, the situation that the intelligent equipment is directly contacted with the key when operated is avoided by designing the non-contact key, so that the probability of cross infection caused by the public contact key is reduced.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect that the device key in the prior art needs to be directly contacted by the user, thereby providing a non-contact key system.
The present invention provides a non-contact key system, comprising: a non-contact key, a microprocessor and a microcontroller; the non-contact type key is internally provided with a humidity sensor which is used for detecting the action of a finger of a user approaching the non-contact type key, generating a first induction signal and sending the first induction signal to the microprocessor; the microprocessor is used for determining key value information of the non-contact key according to the first sensing signal and transmitting the key value information to the microcontroller; the microcontroller is used for generating an instruction corresponding to the key value information according to the key value information.
Optionally, the humidity sensor is specifically configured to: when the humidity of the non-contact key reaches a first preset value, generating a first sensing signal; the non-contact key further includes: the relay is connected with the humidity sensor, and when the humidity sensor generates a first sensing signal, the relay is conducted to generate a trigger signal and send the trigger signal to the microprocessor; the microprocessor is also used for determining second key value information of the non-contact key according to the trigger signal and transmitting the second key value information to the microcontroller.
Optionally, the microcontroller comprises: the function judging module is used for judging a function corresponding to the key value according to the key value; and the instruction sending module is used for sending an instruction which can realize the function according to the function corresponding to the key value.
Optionally, the non-contact key system further includes: the physical sensor is used for detecting the action of a finger of a user approaching the non-contact key and generating a second sensing signal; when the humidity sensor generates the first sensing signal and the physical sensor generates the second sensing signal, the first sensing signal and the second sensing signal are sent to the microprocessor; the microprocessor is also used for determining third key value information of the non-contact key according to the first induction signal and the second induction signal and transmitting the third key value information to the microcontroller.
Optionally, the humidity sensor is specifically configured to: when the humidity of the non-contact key reaches a first preset value, generating a first sensing signal; the physical sensor is specifically configured to: when detecting that the change of the physical quantity of the non-contact key reaches a second preset value, generating a second sensing signal; the non-contact key further includes: the second relay is respectively connected with the humidity sensor and the physical sensor, and when the humidity sensor generates a first induction signal and the physical sensor generates a second induction signal, the second relay is conducted to generate a second trigger signal and send the second trigger signal to the microprocessor; the microprocessor is also used for determining key information of the non-contact key according to the trigger signal and transmitting the key value information to the microcontroller.
Optionally, the humidity sensor comprises: a substrate, an electrode, a hygroscopic material based on a layer of candle ash nanoparticles; the hygroscopic material based on the candle ash nanoparticle layer is distributed on the surface of one side of the substrate with insulating property; the electrode is located on the side of the substrate with insulating properties, in contact with the candelilla nanoparticle layer.
Optionally, the electrodes are interdigitated electrodes; the interdigital electrodes are arranged on the side surface of the substrate with insulating property; the candle ash nano particle layer is prepared on the side surface, covers the main body part of the interdigital electrode and exposes two wiring ends of the interdigital electrode.
Optionally, the electrode is a first square electrode; the first square electrodes are arranged at two end parts of the side surface of the substrate with insulating property, and the candle ash nano particle layer is prepared on the side surface and is in contact with the first square electrodes at the two end parts; the first square electrodes at both ends of the side surface are exposed at least to the wiring region.
Optionally, the electrode is a second square electrode; the candle ash nanoparticle layer is prepared on the side surface of the substrate with insulating property; the second square electrodes are arranged at two end parts of the surface of the candle ash nano particle layer.
Optionally, the surface of the candle ash nanoparticle layer is subjected to a hydrophilization treatment.
The technical scheme of the invention has the following advantages:
1. according to the non-contact key system provided by the invention, the humidity sensor is arranged in the non-contact key and used for detecting the action of a finger of a user approaching the non-contact key, generating and sending a first sensing signal to the microprocessor, the microprocessor determines a key value according to the first sensing signal sent by the humidity sensor and transmits the key value information to the microcontroller, and the microcontroller generates a corresponding instruction according to the key value information. When the humidity sensor detects the action of a user approaching the non-contact key, the signal can be sent to the microprocessor only when the distance between the finger of the user and the non-contact key reaches a certain value, complete contact is not needed, the effect that the microcontroller sends an instruction without contacting with the key is achieved, the non-contact key is arranged through the humidity sensor, and the problem that the existing non-contact key is easily influenced by an external light source and a heat source is solved.
2. According to the non-contact key system provided by the invention, the non-contact key is also provided with the physical sensor besides the humidity sensor, the action of a finger of a user approaching the non-contact key is detected, a second sensing signal is generated, when the microprocessor receives the first sensing signal and the second sensing signal simultaneously, the third key value information of the non-contact key is determined according to the first sensing signal and the second sensing signal, the third key value information is transmitted to the microcontroller, and the microcontroller generates a corresponding instruction according to the key value information. In the non-contact key system provided by the invention, only when the humidity sensor and the physical sensor simultaneously generate sensing signals, the microcontroller can generate corresponding instructions, and the combination of the humidity sensor and the physical sensor enables the non-contact keyboard to be less susceptible to the interference of the external environment and to have more stable performance.
3. According to the non-contact key system provided by the invention, the humidity sensor arranged in the non-contact key comprises the moisture absorption material based on the candle ash nanoparticle layer, and compared with the traditional humidity sensor, the humidity sensor based on the candle ash nanoparticles is superior to the traditional humidity sensor in the aspects of response time, sensitivity and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIGS. 1-2 are schematic structural diagrams of a non-contact key system according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the humidity change on the surface of the humidity sensor and the resistance change of the humidity sensor each time a finger approaches the non-contact button system according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a humidity change on a surface of a humidity sensor and a resistance change of the humidity sensor caused by a proximity distance of a finger in a non-contact button system according to an embodiment of the present invention;
FIGS. 5-8 are schematic structural diagrams of a non-contact key system according to an embodiment of the present invention;
fig. 9(a) is a schematic structural diagram of a humidity sensor based on an interdigital electrode structure provided in an embodiment of the present invention;
fig. 9(b) is a schematic diagram of a substrate structure of a humidity sensor based on an interdigital electrode structure provided in an embodiment of the present invention;
FIG. 9(c) is a schematic diagram of a structure of a deposited silicon dioxide layer of a humidity sensor based on an interdigitated electrode structure provided in an embodiment of the present invention;
fig. 9(d) is a schematic diagram of interdigital electrode preparation for a humidity sensor based on an interdigital electrode structure provided in an embodiment of the present invention;
FIG. 9(e) is a schematic diagram of formation of a candle ash nanoparticle layer by means of fumigation in a humidity sensor based on an interdigitated electrode structure provided in an embodiment of the present invention;
FIG. 9(f) is a schematic illustration of oxygen plasma treatment of a surface of a candle ash nanoparticle layer in a humidity sensor based on an interdigitated electrode structure provided in an embodiment of the present invention;
fig. 10(a) is a schematic structural view of a humidity sensor based on a square electrode structure provided in an embodiment of the present invention;
fig. 10(b) is a schematic substrate structure of a humidity sensor based on a square electrode structure provided in an embodiment of the present invention;
FIG. 10(c) is a schematic illustration of a deposited silicon dioxide layer of a humidity sensor based on a square electrode structure provided in an embodiment of the present invention;
FIG. 10(d) is a schematic diagram of a fabricated square electrode of a humidity sensor based on a square electrode structure provided in an embodiment of the present invention;
FIG. 10(e) is a schematic diagram of formation of a candle ash nanoparticle layer by means of fumigation of a humidity sensor based on a square electrode structure provided in an embodiment of the present invention;
FIG. 10(f) is a schematic diagram of formation of a candle ash nanoparticle layer by means of fumigation of a humidity sensor based on a square electrode structure provided in an embodiment of the present invention;
fig. 11(a) is a schematic structural view of a PDMS substrate-based humidity sensor provided in an embodiment of the present invention;
fig. 11(b) is a schematic view of a PDMS substrate of a humidity sensor based on a PDMS substrate provided in an embodiment of the present invention;
fig. 11(c) is a schematic diagram of formation of a candle ash nanoparticle layer by means of fumigation of a PDMS based humidity sensor provided in an embodiment of the present invention;
fig. 11(d) is a schematic view of oxygen plasma treatment of the surface of ash nanoparticle layer of PDMS based humidity sensor provided in the example of the present invention;
fig. 11(e) is a schematic view of a PDMS substrate-based humidity sensor according to an embodiment of the present invention, in which conductive tapes are attached to both ends of a candle ash nanoparticle layer;
FIG. 12(a) is a top view of a candle ash nanoparticle layer under an electron microscope in an embodiment of the present invention;
FIG. 12(b) is a side view of an electron microscope candle ash nanoparticle layer in accordance with an embodiment of the present invention;
FIG. 13 is a schematic view of a humidity sensitive performance testing system of the humidity sensor in an embodiment of the present invention;
FIG. 14 is a graph of the response of a humidity sensor provided in an embodiment of the present invention at different humidities;
fig. 15 is a response repeatability test chart of the humidity sensor provided in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
An embodiment of the present invention provides a non-contact key system, as shown in fig. 1, including: a non-contact key 10, a microprocessor 20, a microcontroller 30;
the non-contact key 10 is provided with a humidity sensor 11, configured to detect an action of a user approaching the non-contact key 10, generate a first sensing signal, and send the first sensing signal to the microprocessor 20, where in this embodiment, the first sensing signal is generated by a resistance value of the humidity sensor changing due to moisture evaporated from a surface of a human body when a finger approaches the humidity sensor. The humidity sensors 11 disposed in the non-contact keys 10 are humidity sensors based on candle ash nanoparticles, and when there are multiple keys in the non-contact key system, a humidity sensor array needs to be disposed, for example, when the key system includes 9 keys, 9 humidity sensors 11 need to be disposed, and each humidity sensor 11 correspondingly detects whether there is a user approaching one key.
The microprocessor 20 is configured to determine key value information of the non-contact key 10 according to the first sensing signal, and transmit the key value information to the microcontroller 30;
the microcontroller 30 is configured to generate an instruction corresponding to the key value information according to the key value information.
In the non-contact key system provided by the embodiment of the invention, when the humidity sensor 11 detects the action of the user approaching the non-contact key 10, the signal can be sent to the microprocessor 20 only when the distance between the user and the non-contact key 10 reaches a certain value, and the complete contact is not needed, so that the effect that the microcontroller 30 can send an instruction without the contact between the user and the key is achieved, and the problem that the existing non-contact key is easily influenced by an external light source and a heat source is solved by arranging the non-contact key through the humidity sensor. In addition, the humidity sensor 11 adopted by the non-contact key system provided by the embodiment of the invention is a humidity sensor based on candle ash nanoparticles, and the humidity sensor based on candle ash nanoparticles is superior to the traditional humidity sensor in response time, sensitivity and the like, so that the non-contact key system provided by the embodiment of the invention has short response time and high sensitivity.
In an alternative embodiment, the humidity sensor 11 is used in particular for: when detecting that the humidity of the non-contact key 10 reaches a first preset value, generating a first sensing signal;
as shown in fig. 2, the non-contact key 10 further includes: and the relay 12 are connected with the humidity sensor 11, when the humidity sensor 11 generates a first sensing signal, the relay 12 is turned on to generate a trigger signal, and the humidity sensor 11 sends the trigger signal to the microprocessor 20 through the relay 12. In one embodiment, the relay 12 acts as a switch in the touch-less key system, and when the relay is turned on, the circuit is turned on and the microprocessor and microcontroller can operate accordingly.
In a specific embodiment, when the change rate of the resistance reaches 90%, the relay 12 is turned on, since the change of the resistance value of the humidity sensor 11 is caused by the humidity change on the surface of the humidity sensor 11, when a finger approaches a key, moisture evaporated from the surface of a human body causes the humidity at the position of the humidity sensor 11 to change, so that the resistance value of the humidity sensor 11 is reduced, and the relay 12 is triggered to turn on the relay 12. As shown in fig. 3 and 4, the finger can cause the resistance of the humidity sensor 11 to change each time it approaches and moves away from the humidity sensor 11, and when the finger is less than or equal to 4mm away from the surface of the humidity sensor 11, the humidity value of the surface of the humidity sensor 11 is greater than 90% RH and the resistance change rate is greater than 90%.
In a specific embodiment, the relay 12 includes a plurality of interfaces, when the key system includes a plurality of humidity sensors 11, each humidity sensor 11 is connected to one interface, and when a resistance variation value of one of the humidity sensors 11 reaches a preset value, a line connected to the humidity sensor 11 in the relay 12 is turned on, so that the humidity sensor 11 can transmit a signal to the microprocessor 20 through the relay 12, and the microprocessor 20 can determine key value information according to the turned-on circuit.
In an alternative embodiment, as shown in fig. 5, the microcontroller 30 specifically includes:
the function determining module 31 is configured to determine a function corresponding to a key value according to the key value, in a specific embodiment, each key value has a preset function corresponding to the key value, and after receiving the key value information, the microcontroller 30 queries the preset function corresponding to the expectation according to the key value.
And the instruction sending module 32 is configured to send an instruction capable of implementing the function according to the function corresponding to the key value.
In an alternative embodiment, as shown in fig. 6, the non-contact key system provided in the embodiment of the present invention further includes: and the physical sensor 13 is used for detecting the action of the finger of the user approaching the non-contact key to generate a second sensing signal. In a particular embodiment, the physical sensor 13 includes at least one of a photoelectric sensor, a pyroelectric sensor.
The microprocessor 20 is further configured to determine third key value information of the non-contact key according to the first sensing signal and the second sensing signal, and transmit the third key value information to the microcontroller 30.
In the non-contact key system provided by the embodiment of the invention, the non-contact key is provided with the physical sensor 13 besides the humidity sensor 11, the physical sensor detects the action of a user approaching the non-contact key to generate a second sensing signal, when the microprocessor 20 receives the first sensing signal and the second sensing signal at the same time, the third key value information of the non-contact key is determined according to the first sensing signal and the second sensing signal, the third key value information is transmitted to the microcontroller 30, and the microcontroller 30 generates a corresponding instruction according to the key value information. In the non-contact key system provided by the invention, only when the humidity sensor 11 and the physical sensor 13 generate sensing signals simultaneously, the microcontroller 30 can generate corresponding instructions, and the combination of the humidity sensor 11 and the physical sensor 13 enables the non-contact keyboard to be less susceptible to the interference of the external environment and to have more stable performance.
In an alternative embodiment, the humidity sensor 11 is used in particular for: when the humidity of the non-contact key is detected to reach the first preset value, a first sensing signal is generated, which is described in detail in the above description of the humidity sensor 11.
The physical sensor 13 is used in particular for: when the physical quantity of the non-contact key reaches a second preset value, a second sensing signal is generated, when the physical sensor 13 is a thermoelectric sensor, a thermal signal is generated when the temperature above the non-contact key reaches the preset value, and when the physical sensor 13 is a photoelectric sensor, a light signal is generated when the light intensity above the non-contact key reaches the preset value.
As shown in fig. 7, the non-contact key further includes: the second relay 14 and the second relay 14 are respectively connected with the humidity sensor 11 and the physical sensor 13, when the humidity sensor 11 generates a first sensing signal and the physical sensor 13 generates a second sensing signal, the second relay 14 is turned on to generate a second trigger signal, and the second trigger signal is sent to the microprocessor 20, that is, an interface of the second relay 14 is at least connected with one humidity sensor 11 and one physical sensor 13, and only when all sensors connected with the interface of the second relay 14 generate sensing signals, a circuit where the interface is located in the second relay 14 is turned on, so that the microprocessor 20 and the microcontroller 30 execute corresponding operations.
The microprocessor 20 is further configured to determine key information of the non-contact key according to the trigger signal, and transmit the key information to the microcontroller 30.
In an alternative embodiment, as shown in fig. 8, the non-contact key system provided in the embodiment of the present invention further includes a signal output unit 40 for executing the instruction sent by the microcontroller 30.
Example 2
In a first aspect, the embodiments of the present invention provide a humidity sensor based on an interdigital electrode structure, as shown in fig. 9(a), including: the base comprises a substrate 1 and a silicon dioxide layer 2, moisture absorption materials of the hydrophilized candle ash nanoparticle layer 7 are distributed on the surface of one side of the base with insulating property, and the interdigital electrode 3 is positioned on the side of the base with insulating property and is in contact with the hydrophilized candle ash nanoparticle layer 7.
In an alternative embodiment, the interdigital electrode 3 is disposed on the side surface of the substrate having insulating properties; a layer 7 of hydrophilized candelilla nanoparticles is prepared on the side surface and covers the main part of the interdigital electrode 3, exposing the two terminals of the interdigital electrode 3.
In one embodiment, the humidity sensor based on the interdigital electrode structure is prepared by the following process:
step one, preparing a substrate;
as shown in fig. 9(b), a 4-inch silicon wafer is prepared as a substrate 1, and a silicon dioxide layer 2 is deposited on the substrate 1, as shown in fig. 9 (c); the silicon dioxide layer is 100nm thick and is used as an insulating layer; the substrate 1 and the silicon dioxide layer 2 together form a base;
step two, preparing an interdigital electrode 3;
as shown in fig. 9(d), firstly, magnetron sputtering a layer of Al with a thickness of 2 μm on the surface of the silicon dioxide layer 2, and spin-coating a photoresist on the Al layer; placing a mask plate with an electrode pattern on the surface of the photoresist for exposure treatment, and then placing the substrate after exposure treatment into a developing solution for development; putting the developed sample into an Al corrosive liquid to corrode redundant Al; putting the sample into a degumming solution to remove redundant photoresist and taking out;
step three, preparing a candle ash nanoparticle layer 5;
as shown in fig. 9(e), the substrate with the aluminum interdigitated electrodes 3 was placed 1cm above the flame of the lit candle 4 and the substrate was moved laterally at constant speed for 30 seconds;
the formed candle ash nanoparticle layer 5 covers the main part of the interdigital electrode 3, and two wiring ends of the interdigital electrode 3 are exposed;
step four, hydrophilizing the surface of the candle ash nano particle layer; forming a hydrophilized candelilla nanoparticle layer 7;
as shown in fig. 9(f), oxygen plasma 6 bombardment treatment is performed on the candle ash nanoparticle layer 5, the sensor device is placed into a plasma degumming machine with the front side upward, and the sensor device is treated for 120 seconds under the conditions that the cavity temperature is room temperature, the oxygen flow is 2.5L/min, and the power is 300W; the humidity sensor thus produced is shown in FIG. 9 (a).
The second aspect of the embodiment of the present invention provides a humidity sensor based on a square electrode structure, as shown in fig. 10(a), comprising a base, a first square electrode 8, and a hydrophilized ashes nanoparticle layer 7, wherein the base is composed of a substrate 1 and a silica layer 2, the moisture absorption material of the hydrophilized ashes nanoparticle layer 7 is distributed on one surface of the base having insulating property, and the first square electrode 8 is located on the side of the base having insulating property and is in contact with the hydrophilized ashes nanoparticle layer 7.
In an alternative embodiment, first square electrodes 8 are disposed on both ends of the side surface of the substrate having insulating properties, and a hydrophilized candle ash nanoparticle layer 7 is prepared on the side surface and is in contact with both first square electrodes 8 on both ends; the first square electrodes 8 at both end portions of the side surface are exposed at least to the wiring region.
In one embodiment, the humidity sensor based on the square electrode structure is prepared by the following process:
step one, preparing a substrate;
as shown in fig. 10(b), a 4-inch silicon wafer was prepared as a substrate 1, and a silicon dioxide layer 2, as shown in fig. 10(c), having a thickness of 100nm, was deposited on the substrate to serve as an insulating layer; the substrate 1 and the silicon dioxide layer 2 together form a base;
step two, preparing a first square electrode 8;
as shown in fig. 10(d), firstly, magnetron sputtering a layer of Al with a thickness of 2 μm on the surface of the silicon dioxide layer 2, and spin-coating a photoresist on the Al layer; placing a mask plate with an electrode pattern on the surface of the photoresist for exposure treatment, and then placing the substrate after exposure treatment into a developing solution for development; putting the developed sample into an Al corrosive liquid to corrode redundant Al; putting the sample into a degumming solution to remove redundant photoresist and taking out;
the width of each of the first square electrodes 8 is 2mm, and the length of each of the first square electrodes is 5 mm;
the first square electrodes 8 are positioned at two ends of the surface of the substrate silicon dioxide layer 2;
step three, preparing a candle ash nanoparticle layer 5;
as shown in FIG. 10(e), the substrate with the first square electrode 8 of aluminum was placed 1cm above the flame of the lit candle 4 and the substrate was moved laterally at a constant speed for 30 seconds;
the formed candle ash nano particle layer 5 is contacted with the first square electrodes 8 at two ends of the surface of the substrate silicon dioxide layer 2; each first square electrode at least exposes out of the wiring area;
step four, hydrophilizing the surface of the candle ash nano particle layer; forming a hydrophilized candelilla nanoparticle layer 7;
as shown in fig. 10(f), oxygen plasma 6 bombardment treatment is performed on the candle ash nanoparticle layer 5, the sensor device is placed into a plasma degumming machine with the front side upward, and the sensor device is treated for 120 seconds under the conditions that the cavity temperature is room temperature, the oxygen flow is 2.5L/min, and the power is 300W; the humidity sensor thus produced is shown in FIG. 10 (a).
A third aspect of embodiments of the present invention provides a humidity sensor based on a PDMS substrate, as shown in fig. 11(a), including: the base 9 is a piece of PDMS with the length of 1cm, the width of 0.5cm and the thickness of 1mm, the moisture absorption material of the hydrophilized candle ash nanoparticle layer 7 is distributed on one side surface of the base 9, the width of the conductive copper tape 10 is 2mm, and the conductive copper tape is located at two ends of the hydrophilized candle ash nanoparticle layer 7 to form a second square electrode.
In one embodiment, the process for preparing the humidity sensor based on the PDMS substrate is as follows:
step one, preparing a substrate 9; as shown in FIG. 11(b), a piece of PDMS with a length of 1cm, a width of 0.5cm and a thickness of 1mm was prepared as a substrate 9;
step two, preparing a candle ash nanoparticle layer 5;
as shown in fig. 11(c), the PDMS substrate 9 was placed 1cm above the flame of the lit candle 4, and the substrate 9 was moved laterally at a constant speed for 30 seconds;
performing hydrophilization treatment on the surface of the candle ash nano particle layer 5; forming a hydrophilized candelilla nanoparticle layer 7;
as shown in fig. 11(d), oxygen plasma 6 bombardment treatment is performed on the candle ash nanoparticle layer 5, the sensor device is placed into a plasma degumming machine with the front side upward, and the sensor device is treated for 120s under the conditions that the cavity temperature is room temperature, the oxygen flow is 2.5L/min, and the power is 300W;
step four, preparing a second square electrode;
as shown in fig. 11(e), a conductive copper tape 10 having a width of 2mm was attached to both ends of the candelilla nanoparticle layer to form a second square electrode.
In an alternative embodiment, a scanning electron microscope image of the prepared candle ash nanoparticle layer 5 in the three humidity sensors provided in the embodiments of the present invention is shown in fig. 12, wherein fig. 12(a) is a top view of candle ash nanoparticle layer 5, from which it can be seen that a large number of candle ash particles are deposited on the surface of substrate 1 and exhibit a loose porous structure; fig. 12(b) is a side view of candle ash nanoparticle layer 5, from which it can be seen that candle ash nanoparticle layer 5 has a thickness of about 6 μm.
The working principle of the humidity sensor provided by the embodiment of the invention is as follows: the candle ash nano particle layer 5 deposited by flame is in a loose porous structure, and after the oxygen plasma treatment, the surface of the candle ash nano particle layer is changed from hydrophobic to hydrophilic, so that the candle ash nano particle layer has good adsorption effect on water molecules in the air; the detection is expressed by a resistance change rate Response, which is (R0-RRH)/R0 × 100%, where R0 represents the resistance of the humidity sensor at 30% relative humidity, and RRH represents the resistance value at different humidities.
In one embodiment, the moisture sensor was tested using a model SDJS701B rapid moisture change box. For example, as shown in fig. 13, the humidity sensor based on the interdigital electrode structure provided in the first aspect of the embodiment of the present invention is placed in the humidity change chamber, a high-precision multimeter (Agilent34410A) is connected to the interdigital electrode 3 through a wire, after the multimeter shows a stable number, the relative humidity in the humidity change chamber is adjusted from 30% to 90% in 10% step length, then adjusted to 30%, and each humidity point sensor signal is ensured to be stable for more than 3 min. Real-time recording multimeter readings as shown in fig. 14, it can be seen that the rate of change of resistance of the sensor increases with increasing humidity.
The relative humidity in the environment is tested to be 30% by a standard hygrometer, the relative humidity in the quick humidity change box of the SDJS701B model is set to be 90%, after the resistance value of the humidity sensor in the environment is kept stable, the humidity sensor is quickly transferred to the humidity change box, and the operation is repeated for several times and data is recorded as shown in FIG. 15, and the performance of the humidity sensor is still kept stable after a plurality of cycles within the range of the relative humidity of 30% to 90%.
The humidity sensor provided by the embodiment of the invention comprises the candle ash nanoparticle layer 5, and compared with the traditional humidity sensor, the humidity sensor based on candle ash nanoparticles is superior to the traditional humidity sensor in the aspects of response time, sensitivity and the like.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A non-contact key system, comprising: a non-contact key, a microprocessor and a microcontroller;
the non-contact type key is internally provided with a humidity sensor which is used for detecting the action of a user approaching the non-contact type key, generating a first induction signal and sending the first induction signal to the microprocessor;
the microprocessor is used for determining key value information of the non-contact key according to the first sensing signal and transmitting the key value information to the microcontroller;
the microcontroller is used for generating an instruction corresponding to the key value information according to the key value information.
2. The non-contact key system as recited in claim 1, wherein the humidity sensor is specifically configured to: when the humidity of the non-contact key reaches a first preset value, generating a first sensing signal;
the non-contact key further includes: the relay is connected with the humidity sensor, and when the humidity sensor generates a first sensing signal, the relay is conducted to generate a trigger signal and send the trigger signal to the microprocessor;
the microprocessor is also used for determining second key value information of the non-contact key according to the trigger signal and transmitting the second key value information to the microcontroller.
3. The non-contact key system according to claim 1, wherein said microcontroller comprises:
the function judging module is used for judging a function corresponding to the key value according to the key value;
and the instruction sending module is used for sending an instruction which can realize the function according to the function corresponding to the key value.
4. The non-contact key system according to claim 1, further comprising: the physical sensor is used for detecting the action of a user approaching the non-contact key and generating a second induction signal;
when the humidity sensor generates the first sensing signal and the physical sensor generates the second sensing signal, the first sensing signal and the second sensing signal are sent to the microprocessor;
the microprocessor is also used for determining third key value information of the non-contact key according to the first induction signal and the second induction signal and transmitting the third key value information to the microcontroller.
5. The non-contact key system according to claim 4,
the humidity sensor is specifically configured to: when the humidity of the non-contact key reaches a first preset value, generating a first sensing signal;
the physical sensor is specifically configured to: when detecting that the change of the physical quantity of the non-contact key reaches a second preset value, generating a second sensing signal;
the non-contact key further includes: the second relay is respectively connected with the humidity sensor and the physical sensor, and when the humidity sensor generates a first induction signal and the physical sensor generates a second induction signal, the second relay is conducted to generate a second trigger signal and send the second trigger signal to the microprocessor;
the microprocessor is also used for determining key information of the non-contact key according to the trigger signal and transmitting the key value information to the microcontroller.
6. The non-contact key system according to any of claims 1-5,
the humidity sensor includes: a substrate, an electrode, a hygroscopic material based on a layer of candle ash nanoparticles;
the hygroscopic material based on the candle ash nanoparticle layer is distributed on the surface of one side of the substrate with insulating property;
the electrode is located on the side of the substrate with insulating properties, in contact with the candelilla nanoparticle layer.
7. The non-contact key system of claim 6 wherein,
the electrodes are interdigital electrodes;
the interdigital electrodes are arranged on the side surface of the substrate with insulating property; the candle ash nano particle layer is prepared on the side surface, covers the main body part of the interdigital electrode and exposes two wiring ends of the interdigital electrode.
8. The non-contact key system of claim 6 wherein,
the electrode is a first square electrode;
the first square electrodes are arranged at two end parts of the side surface of the substrate with insulating property, and the candle ash nano particle layer is prepared on the side surface and is in contact with the first square electrodes at the two end parts; the first square electrodes at both ends of the side surface are exposed at least to the wiring region.
9. The non-contact key system of claim 6 wherein,
the electrode is a second square electrode;
the candle ash nanoparticle layer is prepared on the side surface of the substrate with insulating property; the second square electrodes are arranged at two end parts of the surface of the candle ash nano particle layer.
10. The non-contact key system of claim 6 wherein,
the surface of the candle ash nanoparticle layer is subjected to hydrophilization treatment.
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| CN201911129592.6A CN110941213A (en) | 2019-11-18 | 2019-11-18 | Non-contact key system |
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