CN112525968A - Alcohol sensor based on blowing method and intelligent equipment - Google Patents
Alcohol sensor based on blowing method and intelligent equipment Download PDFInfo
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- CN112525968A CN112525968A CN202011407697.6A CN202011407697A CN112525968A CN 112525968 A CN112525968 A CN 112525968A CN 202011407697 A CN202011407697 A CN 202011407697A CN 112525968 A CN112525968 A CN 112525968A
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Abstract
The application provides an alcohol sensor and smart machine based on method of blowing, the alcohol sensor includes that alcohol detection module, atmospheric pressure detection module, MCU treater, circuit board and cover locate the casing on the circuit board, alcohol detection module gives the MCU treater with its concentration signal output through a sampling amplifier circuit module, atmospheric pressure detection module links to each other with the MCU treater and realizes the transmission of atmospheric pressure signal, the MCU treater will output alcohol concentration value after concentration signal and atmospheric pressure signal are handled. This application is integrated in the casing with alcohol detection module and atmospheric pressure detection module, because alcohol detection module, atmospheric pressure detection module and outside intercommunication can judge whether there is not enough phenomenon of blowing according to user's the condition of blowing in real time when detecting, reminds the user to blow again or show effectual real-time concentration, under the condition that alcohol sensor volume reduces, still can ensure authenticity and the accuracy that detects.
Description
Technical Field
The application belongs to the technical field of intelligent equipment, and more particularly relates to an alcohol sensor based on a blowing method and intelligent equipment.
Background
The alcohol sensor is a testing tool for detecting the alcohol content of the gas exhaled by the human body, is also a detecting tool for detecting whether or how much a driver drinks when a traffic police is used for law enforcement, can effectively avoid traffic accidents, and can be applied to some high-risk fields or fields where post-drinking is forbidden.
The existing alcohol sensor is large in manufacturing size in order to meet the requirements of signals, is limited in application, is generally only applied to professional alcohol detectors, and can not normally detect the alcohol amount due to the fact that some people cannot meet the requirements during testing.
Disclosure of Invention
An object of the embodiment of the application is to provide an alcohol sensor and intelligent equipment based on a blowing method, and the technical problems that in the prior art, the alcohol sensor cannot detect the blowing amount when being applied and the detection efficiency is low are solved.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: the alcohol sensor based on the blowing method comprises an alcohol detection module, an air pressure detection module, an MCU (microprogrammed control unit) processor, a circuit substrate and a shell, wherein the shell is covered on the circuit substrate, the alcohol detection module outputs a concentration signal to the MCU processor through a sampling amplification circuit module, the air pressure detection module is connected with the MCU processor and transmits the air pressure signal, and the MCU processor processes the concentration signal and the air pressure signal and then outputs an alcohol concentration value.
Further, the shell is provided with a first accommodating cavity communicated with the outside, the alcohol detection module is arranged in the first accommodating cavity, the bottom of the shell is provided with a second accommodating cavity, the top of the shell is provided with an air passage communicated with the outside and the second accommodating cavity, and the air pressure chip is located in the second accommodating cavity.
Further, the air passage comprises a sunken opening positioned at the top, a funnel-shaped channel extending downwards along the sunken opening and a cylindrical channel extending downwards along the funnel-shaped channel, and the cylindrical channel is communicated to the second accommodating cavity.
Furthermore, the air pressure detection module is fixed on the circuit substrate through soft glue.
Furthermore, the shell is also provided with a third accommodating cavity, the MCU processor is positioned in the third accommodating cavity, and a sealant for sealing the MCU processor is filled in the third accommodating cavity.
Further, the alcohol detection module comprises a first solid electrolyte membrane arranged in the first accommodating cavity, a first catalyst wire arranged on the top surface of the first solid electrolyte membrane and electrically connected with the MCU processor, and a second catalyst wire arranged on the bottom surface of the first solid electrolyte membrane and electrically connected with the MCU processor.
And further, the gas-permeable membrane is arranged at the top of the accommodating cavity, and external gas passes through the gas-permeable membrane to react with the first solid electrolyte membrane, the first catalyst wire and the second catalyst wire.
Furthermore, a membrane pressing plate is further arranged in the first accommodating cavity and located at the bottom of the first solid electrolyte membrane, the first catalyst wire and the second catalyst wire are fixed in the accommodating cavity through the membrane pressing plate, and the membrane pressing plate is fixed in the accommodating cavity through a sealant.
Furthermore, a second solid electrolyte membrane is further arranged in the accommodating cavity and at the bottom of the first solid electrolyte membrane, and the second catalyst wire is located between the second solid electrolyte membrane and the first solid electrolyte membrane.
Furthermore, two ends of the alcohol detection module are connected with a switch tube in parallel, and the sampling amplification circuit module is a current type sampling amplification circuit.
Furthermore, the switch tube is a P-type MOS tube, the current-type sampling amplifying circuit includes an operational amplifier, a first capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor, a source of the P-type MOS tube and a non-inverting input terminal of the operational amplifier are connected to one end of the alcohol detection module at the same time, a drain of the P-type MOS tube is connected to the other end of the alcohol detection module, a inverting input terminal of the operational amplifier is connected to the other end of the alcohol detection module through the first resistor, a gate of the P-type MOS tube and a power supply positive electrode of the operational amplifier are connected to a power supply VDD at the same time, the gate of the P-type MOS tube is grounded through the second resistor and the third resistor sequentially, and a connection point of the second resistor and the third resistor is connected to the non-inverting input terminal of the operational amplifier at the same time; the first capacitor and the fourth resistor are connected in parallel between the inverting input end of the operational amplifier and the output end of the operational amplifier, and the output end of the operational amplifier is connected with the input end of the MCU processor through an RC circuit.
The application also provides intelligent equipment which comprises a main body, wherein the alcohol sensor based on the blowing method is arranged in the main body.
The beneficial effect of this application lies in: compared with the prior art, this application is integrated in the casing with alcohol detection module and atmospheric pressure detection module, because alcohol detection module, atmospheric pressure detection module and outside intercommunication can judge whether there is the not enough condition of blowing according to user's the condition of blowing in real time when detecting, reminds the user to blow again or show effectual real-time concentration, under the condition that alcohol sensor volume reduces, still can ensure authenticity and the accuracy that detect.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a top view of an alcohol sensor based on a blowing method provided by an embodiment of the present application;
FIG. 2 is a cross-sectional view taken along A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is an exploded view of an alcohol sensor based on a blowing method according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a circuit structure of an alcohol sensor based on a blowing method according to an embodiment of the present disclosure;
wherein, in the figures, the respective reference numerals:
10-a circuit substrate; 11-an air pressure detection module; 12-an MCU processor; 13-welding holes; 20-a first solid electrolyte membrane; 30-a housing; 31-a first accommodating cavity; 311-bottom chamber; 312-top opening; 313-channel; 33-the airway; 34-a second accommodating cavity; 35-a third accommodating cavity; 40-a second solid electrolyte membrane; 60-first catalyst filaments; 61-a first reaction section; 62-a first connection; 63-a first fixed part; 50-second catalyst filaments; 51-a second reaction section; 52-a second connection; 53-a second fixed part; 511-the middle of the second reaction part; 512-both ends of the second reaction part; 70-a gas permeable membrane; 80-a diaphragm pressing plate; 82-a first limit groove; 81-second limiting groove.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to 6 together, the alcohol sensor based on the air blowing method according to the embodiment of the present application will be described.
The alcohol sensor according to the present embodiment is a rectangular parallelepiped as a whole. It includes circuit substrate 10, locate atmospheric pressure detection module 11 and MCU treater 12 on circuit substrate 10, and the casing 30 on circuit substrate 10 is located to the cover, casing 30 has the first holding chamber 31 with outside intercommunication, be equipped with alcohol detection module in the first holding chamber 31, casing 30 is equipped with the air flue 33 with outside intercommunication, atmospheric pressure detection module 11 is located the bottom of air flue 33, alcohol detection module gives MCU treater 12 with its concentration signal output through a sampling amplification circuit module, atmospheric pressure detection module 11 links to each other with MCU treater 12 and realizes the transmission of atmospheric pressure signal, MCU treater 12 will output alcohol concentration value after concentration signal and atmospheric pressure signal are handled.
In this application, increase atmospheric pressure detection module 11 in the sensor to set up air flue 33 in casing 30, the gaseous partly alcohol detection that carries out through alcohol detection module that blows in during the detection, partly gaseous acts on atmospheric pressure detection module 11 through the air flue, when the atmospheric pressure value that atmospheric pressure detection module 11 monitored is less than the pressure value of the normal blowing of settlement, can confirm the user at this moment and blow inadequately, do not read alcohol testing result, and remind the user to blow again. The alcohol sensor in the application is additionally provided with the air pressure detection module 11 and the MCU processor 12, so that the function of reminding blowing is added, and when the alcohol sensor is applied to various detection devices, the detection efficiency is improved.
Referring to fig. 4, the bottom of the housing 30 has a second receiving cavity 34, the air pressure detecting module 11 is located in the second receiving cavity 34, and the air passage 33 penetrates from the top of the housing 30 to the second receiving cavity 34. Place atmospheric pressure detection module 11 through setting up second holding chamber 34 for atmospheric pressure detection module 11 is arranged casing 30 in completely, and air flue 33 and second holding chamber 34 intercommunication, like this, sealing performance is better, thereby ensures atmospheric pressure monitoring's accuracy.
Specifically, the air duct 33 can be divided into three parts, including a sunken opening 331 at the top, a funnel-shaped passage 332 extending downward along the sunken opening 331, and a cylindrical passage 333 extending downward along the funnel-shaped passage 332, and the cylindrical passage 333 is communicated to the second receiving cavity 34. The opening is sunk, so that the height of the channel is reduced, and the distance between the gas and the gas pressure detection module 11 is shortened; meanwhile, the sunken opening 331 and the funnel-shaped passage 332 enlarge the air inlet area, so that the gas can more easily enter the cylindrical passage 333, and the rapid monitoring is realized.
Further, the air pressure detecting module 11 is fixed on the circuit substrate 10 by a soft glue (not shown). The soft glue is arranged here, on one hand, the air pressure detection module 11 and the circuit on the circuit substrate 10 are fixed into a whole; on the other hand, when gas acts on the air pressure detection module 11 downwards, the air pressure detection module 11 can deform downwards, and the soft glue at the bottom of the air pressure detection module 11 plays a role in buffering, so that a deformation space is provided for the air pressure detection module 11.
In this implementation, the housing 30 further has a third accommodating cavity 35, and after the MCU processor 12 is disposed on the circuit substrate 10 and located in the third accommodating cavity 35, the third accommodating cavity 35 is filled with a sealant 36 to fix the MCU processor 12 and seal the third accommodating cavity 35, so as to prevent gas from entering the third accommodating cavity 35, and ensure that more gas enters the air passage to act on the air pressure detecting module 11.
In this embodiment, the alcohol detection module located in the first accommodating cavity 31 includes a first solid electrolyte membrane 20 disposed in the first accommodating cavity 31, a first catalyst wire 60 disposed on the top surface of the first solid electrolyte membrane 20 and electrically connected to the MCU processor 12, and a second catalyst wire 50 disposed on the bottom surface of the first solid electrolyte membrane 20 and electrically connected to the MCU processor 12.
In this embodiment, the alcohol testing components such as the first solid electrolyte membrane 20, the first catalyst wire 60, and the second catalyst wire 50 are disposed in the compact case 30, so that the internal structure of the alcohol sensor is more compact, and the circuit board 10 can be used as a part of the bottom case while achieving electrical connection, thereby reducing the height of the entire sensor, achieving better lightness and thinness, having higher integration level, and being better applicable to various intelligent devices.
Further, in the present embodiment, a second solid electrolyte membrane 40 is further disposed in the first accommodating cavity 31 and at the bottom of the first solid electrolyte membrane 20, and the second catalyst wire 50 is located between the second solid electrolyte membrane 40 and the first solid electrolyte membrane 20. By arranging the two solid electrolyte membranes, the reaction effect of alcohol, the membranes and the catalyst wires is improved.
In the present embodiment, the cross-sections of the first solid electrolyte membrane 20 and the second solid electrolyte membrane 40 are substantially square, and the size thereof may be 4mm by 4 mm. Of course, the size of the solid electrolyte membrane may be adjusted according to the required size of the entire alcohol sensor. The solid electrolyte membrane is used as a proton exchange membrane and has good chemical resistance and mechanical property, so that the thickness of the solid electrolyte membrane can be very thin, free movement of ions can be ensured during reaction, acidity is achieved, and the effect of reaction with alcohol in air can be achieved.
The first catalytic wires 60 and the second catalytic wires 50 have substantially the same structure, and the structure may be various. Such as first catalytic wires 60 and second catalytic wires 50, may have an inverted L-shape. That is, the first catalytic wire 60 includes a horizontal first reaction portion 61 and a first connection portion 62 bent downward along the first reaction portion 61, the first reaction portion 61 is attached to the top surface of the first solid electrolyte membrane 20, and the first connection portion 62 extends out along the side surface of the first solid electrolyte membrane 20 to be electrically connected to the circuit substrate 10; the second catalytic wire 50 includes a horizontal second reaction portion 51 and a second connection portion 52 bent downward along the second reaction portion 51, the second reaction portion 51 is attached to the top surface of the second solid-state electrolyte membrane 40, and the second connection portion 52 extends out along the side surface of the second solid-state electrolyte membrane 40 and is electrically connected to the circuit substrate 10. During detection, gas enters from the top of the first accommodating cavity 31 to chemically react with the first solid electrolyte membrane 20 and the second solid electrolyte membrane 40 to generate sufficient charges, and the first catalyst wire 60 and the second catalyst wire 50 as conductive electrodes extend out to be electrically connected with the circuit substrate 10, so that signal transmission is realized.
When the catalyst is installed, the two catalyst wires and the two solid electrolyte membranes are mutually pressed and arranged. In order to fix the two catalyst wires more firmly, the two catalyst wires are prevented from falling off. In this example, the two catalysts have the structure shown in fig. 6.
The first catalyst wire 60 further includes a first fixing portion 63 bent downward along an end portion of the first reaction portion 61, the first fixing portion 63 being attached to a side surface of the first solid electrolyte membrane 20 and opposing the first connection portion 62; the second catalytic wire 50 further includes a second fixing portion 53 bent downward along an end portion of the second reaction portion 51, and the second fixing portion 53 is attached to a side surface of the second solid electrolyte membrane 40 and is opposite to the second connection portion 52. Thus, when mounted, the first fixing portion 63 of the first catalyst wire 60 is hooked on one side surface of the first solid electrolyte membrane 20, and the first connecting portion 62 is protruded from the other side surface of the first solid electrolyte membrane 20 opposite thereto; similarly, the second fixing portion 53 of the second catalytic wire 50 is hooked to one side surface of the second solid electrolyte membrane 40, and the second connecting portion 52 extends from the opposite side surface of the second solid electrolyte membrane 40. With this configuration, the first catalytic wires 60 and the second catalytic wires 50 are more firmly attached and are less likely to fall off.
Although the first catalytic wires 60 and the second catalytic wires 50 are not in direct contact, in this embodiment, the first catalytic wires 60 and the second catalytic wires 50 are spatially arranged in a crossed manner, that is, the first reaction part 61 and the second reaction part 51 of the reaction part are arranged in a cross shape, so that the first connection part 62 and the second connection part 52 can extend from different sides of the solid electrolyte membrane, and the first connection part and the second connection part are prevented from contacting with each other when extending from the same side to cause short circuit. Of course, the first catalytic wires 60 and the second catalytic wires 50 may be arranged in other manners, such as parallel or non-parallel manners. As long as the connecting parts of the two catalyst wires are not contacted with each other.
In order to better fix the two solid electrolyte membranes and the two catalyst wires in the first accommodating cavity 31, in this embodiment, a membrane pressing plate 80 is further disposed in the first accommodating cavity 31 and at the bottom of the first solid electrolyte membrane 20. When the catalyst is installed, the shell 30 is inverted, the second catalyst wire 50, the second solid electrolyte membrane 40, the first catalyst wire 60 and the first solid electrolyte membrane 20 are sequentially arranged in the shell, then the second catalyst wire, the second solid electrolyte membrane, the first catalyst wire and the first solid electrolyte membrane are tightly pressed by the membrane pressing plate 80, and finally the shell is sealed and fixed by sealing glue.
In this embodiment, since the membrane pressing plate 80 is disposed at the bottom, in order to make the first catalyst wire 60 and the second catalyst wire 50 extend out and electrically connect with the circuit substrate 10 better, the sidewall of the membrane pressing plate 80 is respectively disposed with the first limiting groove 82 and the second limiting groove 81, the first connecting portion 62 of the first catalyst wire 60 extends out downwards along the first limiting groove 82 and electrically connects with the circuit substrate 10, and the second connecting portion 52 of the second catalyst wire 50 extends out downwards along the second limiting groove 81 and electrically connects with the circuit substrate 10.
As shown in fig. 5, in the present embodiment, the first receiving cavity 31 is vertically through and can be divided into three parts according to the size of the through hole, namely, a bottom cavity 311, a top opening 312, and a channel 313 communicating the bottom cavity 311 and the top opening 312. The membrane pressing plate 80, the first solid electrolyte membrane 20 and the second solid electrolyte membrane 40 are sequentially arranged in the bottom cavity 311, the breathable membrane 70 is arranged in the top opening 312, and the channel 313 between the bottom cavity 311 and the top opening 312 is filled with air, so that the first solid electrolyte membrane 20, the second solid electrolyte membrane 40 and the breathable membrane 70 can be fully contacted with gas, sufficient current is formed, and the accuracy of the test is ensured. In the above configuration, the middle portion 611 of the second reaction portion 51 of the second catalytic wire 50 faces the passage 313, and the ceiling wall of the bottom chamber 311 is pressed against both end portions of the second reaction portion 51. In this way, on the one hand, the second reaction part 51 of the second catalytic wires 50 can be sufficiently contacted with the air in the channel 313 and the top opening 312, and on the other hand, the top wall of the bottom chamber 311 exerts a certain pressing action on both end parts 612 of the second reaction part 51, so that the second catalytic wires 50 and the second solid electrolyte membrane 40 can be more favorably fixed.
In this embodiment, the top opening 312 is a sunken stepped hole formed in the top surface of the housing 30, a gas permeable membrane 70 is disposed on the stepped surface of the sunken stepped hole, and external gas can pass through the gas permeable membrane 70 to react with the first solid electrolyte membrane 20, the first catalyst filament 60 and the second catalyst filament 50. The gas permeable membrane 70 can filter water vapor and dust in the gas, but has good gas permeability, so that the clean gas can pass through the gas permeable membrane to ensure more accurate detection. Of course, the air permeable film 70 may be omitted from the alcohol sensor in this embodiment, and when the alcohol sensor is applied to various devices or apparatuses, the air permeable film 70 may be provided on the devices or apparatuses, and may also function as a waterproof, dustproof, and air permeable film. The cross section of the sunken stepped bore is square, and the cross sections of the channel 313 and the bottom chamber 311 communicated with the sunken stepped bore are also square. Adopt square top opening, can accomplish the air inlet the biggest in limited area, can effectual guarantee sufficient air input like this to make miniature, alcohol sensor can not be less than traditional alcohol sensor signal, and square first holding chamber 31 is bulky, is favorable to alcohol and two catalyst silk and two solid-state electrolyte membranes to carry out chemical reaction.
Further, in the present embodiment, a heating device (not shown) is further disposed in the first accommodating chamber 31. Heating device specifically can be the heating plate, through heating first holding chamber 31 after the test, makes the gas that has the alcohol can volatilize fast, and no gas remains in first holding chamber 31, also clears zero the alcohol in first holding chamber 31, guarantees the accuracy of next test.
In this embodiment, the first catalytic wires 60 and the second catalytic wires 50 are made of a noble metal. Specifically, the noble metal may be a platinum wire, and of course, other noble metals may be used to form the catalyst wire.
In the present embodiment, the circuit board 10 includes a circuit board 11 and components (not shown) provided on the circuit board. Two welding holes 13 are formed in the circuit substrate 11, and the first catalytic wire 60 and the second catalytic wire 50 are welded to the two welding holes 13 after extending out of the first limiting groove 82 and the second limiting groove 81.
In the present embodiment, a current-mode amplifier circuit is used to process the sampling signal obtained by the alcohol detection module. Referring to the schematic circuit structure of fig. 6, a switching tube, here a P-type MOS tube, is connected in parallel to two ends of the alcohol detection module. The MOS tube is opened during sampling, and the MOS tube is closed to discharge the alcohol detection module after sampling is finished, so that the charge balance of the alcohol detection module can be kept when no measurement is carried out. When the alcohol detection module samples gas containing certain alcohol concentration, current changes, the current signal is converted into a voltage signal and amplified, the voltage signal is transmitted to the MCU processor to be processed, and finally, a result is output through a digital signal.
As shown IN fig. 6, the current-type sampling amplifying circuit includes an operational amplifier U1, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, a source of a P-type MOS transistor and a non-inverting input terminal IN + of an operational amplifier U1 are simultaneously connected to one end of an alcohol detection module J1, a drain of the P-type MOS transistor is connected to the other end of the alcohol detection module J1, the other end of the alcohol detection module J1 is further connected to an inverting input terminal IN + of an operational amplifier U1 through a first resistor R1, a gate of the P-type MOS transistor and a power supply positive electrode of the operational amplifier are simultaneously connected to a power supply VDD, the gate of the P-type MOS transistor is further grounded through a second resistor R2 and a third resistor R3 IN sequence, and a connection point of the second resistor R2 and the third resistor R3 is simultaneously connected to a non-inverting input terminal IN +; the first capacitor C1 and the fourth resistor R4 are connected IN parallel between the inverting input end IN-of the operational amplifier U1 and the output end OUT of the operational amplifier, and the output end OUT of the operational amplifier U1 is connected with the input end of the MCU processor through an RC circuit.
In this embodiment, the MCU processor is a single chip microcomputer, and the input terminal of the MCU processor is an analog input signal terminal. The operational amplifier U1 is an operational amplifier with high amplification factor, and because the signal sampled by the alcohol detection module J1 is a weak signal, a single power supply reverse phase amplification principle is adopted, and a bias voltage is arranged at a non-inverting input end and can be adjusted. The signal of the alcohol detection module J1 is processed by the sampling amplification circuit, then passes through an RC filter circuit and is sent to the analog input signal end of the MCU processor. Specifically, the current signal output by the alcohol detection module J1 is converted into a voltage signal, amplified, and then transmitted to the analog input signal end of the MCU processor.
When alcohol concentration's gas is sampled to alcohol detection module J1, the electric current can change, send the MCU treater to after converting the current signal of sampling into voltage signal and enlargies and handle, process voltage signal through the MCU treater and obtain the concentration value of alcohol, and this concentration data passes through the digital interface output of MCU treater, and the outside can read the data of alcohol sensor through a treater or other communication intelligent equipment like this.
Simultaneously, atmospheric pressure detection module among this application alcohol sensor includes baroceptor J2, and the baroceptor signal is voltage signal, can be directly with the analog input of this signal input to MCU treater. After the MCU processor samples the signal of the air pressure sensor J2, the air pressure value is PX through processing, when the air pressure of a user changes, the air pressure value PX changes accordingly, the degree of air blowing of the user is judged according to the change of the PX, and when the value of Px is larger than the set value P1 (the pressure value of normal air blowing), the MCU processor starts to read the numerical value of the alcohol detection module J1 and starts to calculate the alcohol concentration. When the value of Px is smaller than P1 (the pressure value of normal air blowing), the alcohol detection module J1 at this time can hardly detect alcohol data, and can determine that the air blowing of the user is insufficient at this time, and does not read the data of the sensor, and remind the user to blow air again.
Since the air pressure sensor J2 is used to monitor the blowing pressure level of the user, and the starting point is set to P1, the alcohol detection module J1 can detect the alcohol concentration only when the blowing pressure reaches above P1, and the alcohol concentration has a certain proportional relationship with the air pressure, and the alcohol concentration is higher when the blowing pressure is higher. When the air pressure reaches a certain value P2, the alcohol concentration is no longer influenced by the air pressure change, the air pressure value is set to be P2, the measured alcohol concentration is recorded as Gx, and the actually output alcohol concentration value is recorded as GDThe actual output alcohol concentration value is compared with the detected alcohol concentrationThe relationship between (A) and (B) is:
when P is presentX<P1: gD＝0；
When P1<＝PX<When P2:
when P is presentX>P2: gD＝Gx；
P1 is the starting pressure value at which the blow can start to be measured,
p2 is a pressure value at which the blowing is completely sufficient and the alcohol concentration does not change any more
PXIs the measured pressure value during the measurement, Gx is the measured alcohol concentration value, GDThe alcohol concentration value is actually output; k is the measurement uncertainty factor (in actual measurements, there will be some uncertainty from sensor to sensor, and this uncertainty is used to adjust the accuracy of the actual output). The concentration data is output through a digital interface of the MCU processor, so that the data of the sensor can be read by an MCU or other communication intelligent equipment from the outside.
This application is integrated in the casing with alcohol detection module J1 and atmospheric pressure detection module, set up the air flue simultaneously on the casing, because air flue and alcohol detection module J1, atmospheric pressure detection module and outside intercommunication, can judge whether there is not enough phenomenon of blowing according to user's the condition of blowing in real time when detecting, remind the user to blow again or show effectual real-time concentration, under the condition that alcohol sensor volume reduces, true and the accuracy that still can detect.
The application also provides an intelligent device (not shown in the figure), which comprises a main body, wherein the alcohol sensor based on the blowing method is arranged in the main body. Because the alcohol sensor is small in size and accurate in test, the alcohol sensor can be widely applied to mobile phones or daily wearable devices such as bracelets, watches and glasses.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (12)
1. An alcohol sensor based on a blowing method is characterized in that: locate including alcohol detection module, atmospheric pressure detection module, MCU treater, circuit substrate and cover casing on the circuit substrate, alcohol detection module gives its concentration signal output through a sampling amplifier circuit module the MCU treater, atmospheric pressure detection module with the MCU treater links to each other and realizes the transmission of atmospheric pressure signal, the MCU treater will concentration signal and atmospheric pressure signal handle the back output alcohol concentration value.
2. The air blowing method-based alcohol sensor according to claim 1, wherein: the casing has the first holding chamber with outside intercommunication, alcohol detection module sets up first holding intracavity, the casing bottom has the second holding chamber, the casing top have the intercommunication outside with the air flue in second holding chamber, the atmospheric pressure chip is located the second holding intracavity.
3. The air blowing method-based alcohol sensor according to claim 2, wherein: the air passage comprises a sunken opening positioned at the top, a funnel-shaped channel extending downwards along the sunken opening and a cylindrical channel extending downwards along the funnel-shaped channel, and the cylindrical channel is communicated to the second accommodating cavity.
4. The air blowing method-based alcohol sensor according to claim 1, wherein: the air pressure detection module is fixed on the circuit substrate through soft glue.
5. The air blowing method-based alcohol sensor according to claim 1, wherein: the shell is further provided with a third accommodating cavity, the MCU processor is located in the third accommodating cavity, and sealant for sealing the MCU processor is filled in the third accommodating cavity.
6. The air blowing method based alcohol sensor according to any one of claims 1 to 5, wherein: the alcohol detection module comprises a first solid electrolyte membrane arranged in the first accommodating cavity, a first catalyst wire arranged on the top surface of the first solid electrolyte membrane and electrically connected with the MCU processor, and a second catalyst wire arranged on the bottom surface of the first solid electrolyte membrane and electrically connected with the MCU processor.
7. The air blowing method-based alcohol sensor according to claim 6, wherein: the gas-permeable membrane is arranged at the top of the accommodating cavity, and external gas passes through the gas-permeable membrane to react with the first solid electrolyte membrane, the first catalyst wire and the second catalyst wire.
8. The air blowing method-based alcohol sensor according to claim 7, wherein: the first solid-state electrolyte membrane, the first catalyst wire and the second catalyst wire are fixed in the accommodating cavity through the membrane pressing plate, and the membrane pressing plate is fixed in the accommodating cavity through a sealant.
9. The air blowing method-based alcohol sensor according to claim 6, wherein: and a second solid electrolyte membrane is further arranged in the accommodating cavity and at the bottom of the first solid electrolyte membrane, and the second catalyst wire is positioned between the second solid electrolyte membrane and the first solid electrolyte membrane.
10. The air blowing method-based alcohol sensor according to claim 1, wherein: the two ends of the alcohol detection module are connected with a switching tube in parallel, and the sampling amplification circuit module is a current type sampling amplification circuit.
11. The air blowing method based alcohol sensor of claim 10, wherein: the switching tube is a P-type MOS tube, the current-type sampling amplifying circuit comprises an operational amplifier, a first capacitor, a first resistor, a second resistor, a third resistor and a fourth resistor, a source electrode of the P-type MOS tube and a non-inverting input end of the operational amplifier are simultaneously connected with one end of the alcohol detection module, a drain electrode of the P-type MOS tube is connected with the other end of the alcohol detection module, an inverting input end of the operational amplifier is connected with the other end of the alcohol detection module through the first resistor, a grid electrode of the P-type MOS tube and a power supply positive electrode of the operational amplifier are simultaneously connected with a power supply VDD, the grid electrode of the P-type MOS tube is sequentially grounded through the second resistor and the third resistor, and a connecting point of the second resistor and the third resistor is simultaneously connected with the non-inverting input end of the operational amplifier; the first capacitor and the fourth resistor are connected in parallel between the inverting input end of the operational amplifier and the output end of the operational amplifier, and the output end of the operational amplifier is connected with the input end of the MCU processor through an RC circuit.
12. An intelligent device, comprising a main body, characterized in that: the body is provided with an alcohol sensor based on the blowing method according to any one of claims 1 to 11 inside.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011407697.6A CN112525968A (en) | 2020-12-04 | 2020-12-04 | Alcohol sensor based on blowing method and intelligent equipment |
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| CN202011407697.6A CN112525968A (en) | 2020-12-04 | 2020-12-04 | Alcohol sensor based on blowing method and intelligent equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281385A (en) * | 2021-05-24 | 2021-08-20 | 无锡职业技术学院 | Portable air blowing type alcohol concentration measuring device and measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281385A (en) * | 2021-05-24 | 2021-08-20 | 无锡职业技术学院 | Portable air blowing type alcohol concentration measuring device and measuring method |
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