CN105699296A - Alcohol detecting instrument and alcohol detecting method - Google Patents
Alcohol detecting instrument and alcohol detecting method Download PDFInfo
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- CN105699296A CN105699296A CN201610078277.5A CN201610078277A CN105699296A CN 105699296 A CN105699296 A CN 105699296A CN 201610078277 A CN201610078277 A CN 201610078277A CN 105699296 A CN105699296 A CN 105699296A
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000012545 processing Methods 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims description 19
- 239000000446 fuel Substances 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 description 10
- 230000003321 amplification Effects 0.000 description 9
- 238000003199 nucleic acid amplification method Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 5
- 239000008280 blood Substances 0.000 description 4
- 210000004369 blood Anatomy 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 210000004072 lung Anatomy 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011002 quantification Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 208000002925 dental caries Diseases 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 210000000214 mouth Anatomy 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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Abstract
The invention discloses an alcohol detecting instrument and an alcohol detecting method.The alcohol detecting instrument comprises a microprocessor, a display screen and an infrared detecting device.The infrared detecting device comprises a driving circuit, a gas chamber and a signal processing circuit, an infrared light source and an infrared detector are respectively arranged at two ends of the gas chamber, a gas inlet and a gas outlet are further formed in the gas chamber, the gas outlet is provided with a fan, the driving circuit is electrically connected with the infrared light source, the infrared detector is electrically connected with an input end of the signal processing circuit, and the microprocessor is electrically connected with the display screen, a control end of the driving circuit, an output end of the signal processing circuit and the fan.The alcohol detecting instrument and the alcohol detecting method have the advantages that the concentration of gaseous alcohol is detected in an infrared mode and can be detected in a wired manner, detection result curves can be accurately recorded, and the alcohol detecting instrument and the alcohol detecting method are low in cost and high in detection efficiency.
Description
Technical field
The present invention relates to alcohol detection technical field, particularly relate to a kind of alcohol content tester and detection method thereof。
Background technology
Fast development along with auto industry, the vehicle accident caused because driving when intoxicated grows with each passing day, the harm of the people's lives and property safety is highlighted gradually, and detect driver and whether drive when intoxicated and can effectively control the infringement of driver, also it is one of the important measures in the evidence obtaining of vehicle accident " Invest, Then Investigate "。Judging whether it is drive when intoxicated, optimal method is to check the BAC (BloodAlcoholConcentration) of driver, i.e. alcohol concentration in blood。Investigating on the spot or in the daily traffic checking of traffic-police in the scene of the accident, the most simple and effective scheme is the alcohol content during Site Detection driver exhales。
Existing alcohol content tester adopts fuel cell type sensor detected gas alcohol concentration, relatively costly；Continuous print detection can not be carried out, it means that the change curve of alcohol content of exhalation gas concentration can not be described, to such an extent as to can not judge that the gas of exhalation comes from alveolar or the oral cavity only from measured；Needing often to demarcate at regular intervals, detection efficiency is low。
Summary of the invention
It is an object of the invention to overcome existing alcohol content tester to adopt fuel cell type sensor detected gas alcohol concentration, relatively costly, continuous print detection can not be carried out, the technical problem that detection efficiency is relatively low, it is provided that a kind of alcohol content tester and detection method thereof, it passes through infrared mode detected gas alcohol concentration, line detection can be carried out, accurate recording testing result curve, less costly, detection efficiency is high。
In order to solve the problems referred to above, the present invention is achieved by the following technical solutions:
A kind of alcohol content tester of the present invention, including microprocessor, display screen and infrared detecting device, described infrared detecting device includes drive circuit, air chamber and signal processing circuit, described air chamber is respectively arranged at two ends with infrared light supply and Infrared Detectors, described air chamber is additionally provided with air inlet and gas outlet, described gas outlet is provided with fan, described drive circuit electrically connects with infrared light supply, described Infrared Detectors electrically connects with the input of signal processing circuit, described microprocessor respectively with display screen, the control end of drive circuit, the outfan of signal processing circuit and fan electrical connection。
In the technical program, infrared light supply is IRL715 infrared light supply, and IRL715 infrared light supply belongs to heat radiation type light source, maximum gauge 3.17mm, and wavelength, from visible ray to 5 μm, is suitable for the measurement to alcohol gas。From air chamber one end enter ultrared amount and the ultrared amount gone out from the other end between difference with air chamber absorbs the proportionate relationship that ultrared gaseous sample alcohol concentration becomes certain。
During detection, exhaust tube is connected with air inlet, measured blows air into air chamber by exhaust tube, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends interacts with the ethanol in the gas to be measured entering air chamber, infra-red radiation light is by alcohol absorption, and the amount of absorption is the function relevant to alcohol concentration, optical path length (i.e. air chamber length) and INFRARED ABSORPTION constant in gas。Due to alcohol absorption infrared ray in gas, the light that can arrive air chamber end will weaken than initially, the infrared light arriving air chamber end is absorbed by Infrared Detectors, it is converted into voltage signal, being sent to microprocessor after signal processing circuit processes, microprocessor is gone out alcohol concentration in gas according to voltage signal and default optical path length, the INFRARED ABSORPTION constant calculations of input, and is shown by display screen, infrared detecting device carries out continuous detecting, display screen display testing result curve。After having detected, microprocessor controls fan work, is discharged by the gas in air chamber, it is simple to detect next time。
Substantial amounts of statistical study result shows, there are a kind of stable relations in the internal gas having only in alveolar and blood in alcohol concentration, so only by analyzing the gas of exhalation from alveolar, the quantification result of expiration alcohol concentration or BAC just can be obtained。Reaching more than three seconds if exhaled with medium dynamics after the deep air-breathing of measured, the gas at this moment breathed out is exactly from deep lung gas out, therefore intercepts the testing result reaching more than five seconds of exhaling according to testing result curve as measured's expiration alcohol concentration。
As preferably, being provided with concave mirror on rear side of described infrared light supply, described infrared light supply is positioned at the focal point of concave mirror。The infrared light that infrared light supply sends forms directional light through concave mirror and injects air chamber。
As preferably, described air chamber is divided into and being parallel to each other and the first air cavity that length is equal and the second air cavity, described first air cavity and the second air cavity do not connect, two test sides of described Infrared Detectors lay respectively at the end of the first air cavity and the end of the second air cavity, the infrared light that described infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, and described air inlet connects with the first air cavity with gas outlet。
Air chamber is divided into the first air cavity side by side and the second air cavity。Measured only enters the first air cavity by the gas that exhaust tube is blown into, and does not enter the second air cavity。The infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor, microprocessor goes out alcohol concentration in gas according to voltage signal U1, U2 and default optical path length, INFRARED ABSORPTION constant calculations。Voltage signal U1 is directly relevant with the alcohol concentration of tested gas；Voltage signal U2 is unrelated with the alcohol concentration of tested gas, and it reflects the factors such as external environmental condition, as reference signal, utilizes it that detected gas measured value is compensated, and can improve the precision and accuracy measured。
As preferably, described air inlet place is provided with gas flow sensor, and described gas flow sensor electrically connects with microprocessor。Microprocessor detects measured by gas flow sensor and is blown into the gas flow of air chamber, the gas flow of display screen display detection, it is simple to observe whether measured is blown into enough gas。
As preferably, being additionally provided with heating module and temperature sensor in described air chamber, described heating module and temperature sensor electrically connect with microprocessor respectively。Temperature in air chamber is controlled, in set point, to be processed by constant temperature by heating module, gets rid of the temperature impact on detection data。
As preferably, being provided with fuel cell alcohol sensor bottom described first air cavity, described fuel cell alcohol sensor electrically connects with microprocessor。The alcohol concentration of fuel cell alcohol sensor detected gas can also be passed through。
As preferably, described a kind of alcohol content tester also includes memory element, and described memory element electrically connects with microprocessor。
The detection method of a kind of alcohol content tester of the present invention, comprises the following steps:
S1: the gas of measured's exhalation enters the first air cavity by air inlet, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor；
S2: voltage signal U1 and voltage signal U2 is substituted into alcohol content formula C=-1/KL (lnU in gas by microprocessor1-lnU2+ A), calculate the alcohol content C of gas in the first air cavity, wherein, K is the absorbed proportionality coefficient of light, and L is the length of the first air cavity, and A is known parameters, and display screen shows the gaseous alcohol content C calculated。
As preferably, in described gas, alcohol content formula is obtained by following steps:
N1: pass into, in the first air cavity, the gas that alcohol content is known, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor；
N2: assume that the light intensity that infrared light supply penetrates is I0Infrared light, then the light intensity I of the emergent light of the first air cavity1=I0Exp (-KCL), the light intensity I of the emergent light of the second air cavity2=I0, obtain equation below:
U1=M1·I0Exp (-KCL)；
U2=M2·I0；
Wherein, M1 is the scale factor of the first air cavity, and M2 is the scale factor of the second air cavity, above-mentioned two formula is asked ratio, obtains U1/U2=M1/M2Exp (-KCL), thus obtaining C=-1/KL (lnU1-lnU2+lnM2-lnM1), setting parameter A=lnM2-lnM1, obtain C=-1/KL (lnU1-lnU2+ A)；
Due to, K, L, C are known parameters, and microprocessor can calculate the value of parameter A according to voltage signal U1 and voltage signal U2, finally give alcohol content formula C=-1/KL (lnU in gas1-lnU2+ A), wherein, K is the absorbed proportionality coefficient of light, and L is the length of the first air cavity, and A is known parameters, and U1 is the voltage that Infrared Detectors detects the first air cavity emergent light light intensity output, and U2 is the voltage that Infrared Detectors detects the second air cavity emergent light light intensity output。
As preferably, the detection method of described a kind of alcohol content tester also includes step N3: prepare the gas of different alcohol content, successively the gas of different alcohol contents is passed into the first air cavity, adopt step N1 to step N2 that the different ethanol content gas passed in the first air cavity are detected, obtain the value of multiple parameter A, then the value of the multiple parameter A obtained is averaged, using this meansigma methods final numerical value as parameter A。
The substantial effect of the present invention is: (1) is by infrared mode detected gas alcohol concentration, it is possible to carrying out line detection, accurate recording testing result curve, less costly, detection efficiency is high。(2) air chamber being divided into two air cavitys, an air cavity is as gas detecting passage, and another air cavity, as reference channel, gets rid of environmental factors interference, can improve the precision and accuracy measured。
Accompanying drawing explanation
Fig. 1 is the structural representation of the infrared detecting device of the present invention；
A kind of circuit theory that Fig. 2 is the present invention connects block diagram。
In figure: 1, microprocessor, 2, display screen, 3, drive circuit, 4, air chamber, 5, infrared light supply, 6, Infrared Detectors, 7, air inlet, 8, gas outlet, 9, fan, 10, concave mirror, 11, first air cavity, 12, second air cavity, 13, gas flow sensor, 14, pressure transducer, 15, heating module, 16, fuel cell alcohol sensor, 17, wireless communication module, 18, fingerprint identification module, 19, thermal printer, 20, keyboard, 21, audible-visual annunciator, 22, memory element, 23, pre-amplification circuit, 24, filter amplification circuit, 25, A/D change-over circuit, 26, temperature sensor, 27, GPS module, 28, signal processing circuit。
Detailed description of the invention
By the examples below, and in conjunction with accompanying drawing, technical scheme is described in further detail。
Embodiment: a kind of alcohol content tester of the present embodiment, such as Fig. 1, shown in Fig. 2, including microprocessor 1, display screen 2, infrared detecting device, wireless communication module 17, fingerprint identification module 18, GPS module 27, thermal printer 19, keyboard 20, audible-visual annunciator 21, memory element 22, infrared detecting device includes drive circuit 3, air chamber 4 and signal processing circuit 28, air chamber 4 rear and front end is respectively equipped with infrared light supply 5 and Infrared Detectors 6, it is provided with concave mirror on rear side of infrared light supply 5, described infrared light supply 5 is positioned at the focal point of concave mirror 10, air chamber 4 is divided into and being parallel to each other and the first air cavity 11 and the second air cavity 12 that length is equal, first air cavity 11 does not connect with the second air cavity 12, two test sides of Infrared Detectors 6 lay respectively at the end of the first air cavity 11 and the end of the second air cavity 12, the infrared light that infrared light supply 5 sends is parallel after concave mirror 10 reflects injects the first air cavity 11 and the second air cavity 12, first air cavity 11 is provided with air inlet 7 and gas outlet 8, air inlet 7 is provided with gas flow sensor 13, gas outlet 8 is provided with fan 9, drive circuit 3 electrically connects with infrared light supply 5, Infrared Detectors 6 electrically connects with the input of signal processing circuit 28, microprocessor 1 respectively with display screen 2, wireless communication module 17, fingerprint identification module 18, GPS module 27, thermal printer 19, keyboard 20, audible-visual annunciator 21, memory element 22, the control end of drive circuit 3, the outfan of signal processing circuit 28, gas flow sensor 13 and fan 9 electrically connect。
Infrared light supply is IRL715 infrared light supply, and IRL715 infrared light supply belongs to heat radiation type light source, maximum gauge 3.17mm, and wavelength, from visible ray to 5 μm, is suitable for the measurement to alcohol gas。From air chamber one end enter ultrared amount and the ultrared amount gone out from the other end between difference with air chamber absorbs the proportionate relationship that ultrared gaseous sample alcohol concentration becomes certain。Air chamber adopts cylindrical structural, and in order to reduce light loss in transmitting procedure, the inwall of air chamber to have enough fineness, it is possible to is realized by the polishing of inwall or plated film。
Owing to analyzed gas componant is complicated, having certain corrosivity, long-time use rear gas chamber is very easily contaminated, directly affects certainty of measurement。Therefore, infrared detecting device also includes the external supporting structure being arranged on air chamber two ends, external supporting structure and air chamber removably connect, external supporting structure fixes the two ends of air chamber, the supporting construction at two ends need not be converted when changing middle air chamber, simultaneously because separate with external supporting structure, further reduce the impact of external condition, make instrument adapt to work under complex environment。
Air chamber is divided into the first air cavity side by side and the second air cavity。During detection, exhaust tube is connected with air inlet, measured only enters the first air cavity by the gas that exhaust tube is blown into, do not enter the second air cavity, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends forms directional light through concave mirror and injects the first air cavity and the second air cavity, the infrared light that infrared light supply sends interacts with the ethanol in the gas to be measured entering the first air cavity, infra-red radiation light is by alcohol absorption, the amount absorbed is and alcohol concentration in gas, the function that optical path length (i.e. the first air cavity length) is relevant with INFRARED ABSORPTION constant。Due to alcohol absorption infrared ray in gas, the light that can arrive the first air cavity end will weaken than initially, the infrared light arriving the first air cavity end is absorbed by Infrared Detectors, it is converted into the voltage signal U1 corresponding with the light intensity of the first air cavity emergent light, after signal processing circuit processes, is sent to microprocessor。Second air cavity does not have gas to be measured, the infrared light that infrared light supply sends is not absorbed, the light arriving the second air cavity end does not weaken, the infrared light arriving the second air cavity end is absorbed by Infrared Detectors, it is converted into the voltage signal U2 corresponding with the light intensity of the second air cavity emergent light, as reference signal, microprocessor substitutes into formula C=-1/KL (lnU according to voltage signal U1, U2 and default optical path length L, INFRARED ABSORPTION constant K1-lnU2+ A), A is parameter, calculates alcohol concentration C in gas, and is shown by display screen, and infrared detecting device carries out continuous detecting, display screen display testing result curve。After having detected, microprocessor controls fan work, is discharged by the gas in air chamber, it is simple to detect next time。Voltage signal U1 is directly relevant with the alcohol concentration of tested gas；Voltage signal U2 is unrelated with the alcohol concentration of tested gas, and it reflects the factors such as external environmental condition, as reference signal, utilizes it that detected gas measured value is compensated, and can improve the precision and accuracy measured。
Substantial amounts of statistical study result shows, there are a kind of stable relations in the internal gas having only in alveolar and blood, so only just can obtain the quantification result of expiration alcohol concentration or BAC by analyzing the gas breathed out from alveolar in alcohol concentration。If exhaled with medium dynamics after the deep air-breathing of measured reach more than three seconds, at this moment the gas breathed out is exactly from deep lung gas out, therefore the test result exhaled between T1 to the T2 second is intercepted as measured's expiration alcohol concentration according to test result curve, T2 > T1 > 3, or gas flow sensor is detected, and the meansigma methods of incoming call gas flow test result between set point Q1 to Q2 is as measured's expiration alcohol concentration。When testing result exceedes setting value, audible-visual annunciator sends sound and light alarm。
Microprocessor detects measured by gas flow sensor and is blown into the gas flow of air chamber, the gas flow of display screen display detection, it is simple to observe whether measured is blown into enough gas。Thermal printer can print out testing result。Memory element is used for storing testing result。
Fingerprint identification module identification measured's fingerprint, the position of GPS module detection alcohol content tester, keyboard can input the driver license number of measured, alcohol concentration C in the gas that detection is obtained, measured's finger print information, the positional information binding storage of the driver license number of measured and GPS module detection, and it is sent to Cloud Server, Cloud Server searches whether database authentication driver license number mates with finger print information, if coupling, by alcohol concentration C in the gas of detection, the positional information binding storage of the driver license number of measured and GPS module detection, and send and be proved to be successful information to alcohol content tester, if do not mated, then by alcohol concentration C in the gas of detection, the positional information binding storage of measured's finger print information and GPS module detection, and send authentication failed information to alcohol content tester。
Signal processing circuit 28 includes pre-amplification circuit 23, filter amplification circuit 24 and A/D change-over circuit 25, Infrared Detectors 6 electrically connects with the input of pre-amplification circuit 23, the outfan of pre-amplification circuit 23 electrically connects with the input of filter amplification circuit 24, the outfan of filter amplification circuit 24 electrically connects with the input of A/D change-over circuit 25, and the outfan of A/D change-over circuit 25 electrically connects with microprocessor 1。The small-signal exported by Infrared Detectors, through pre-amplification circuit and two grades of filtering and amplifying circuits, obtains stable signal, and signal is changed through A/D, delivers to microprocessor processes。
It is provided with pressure transducer 14 in first air cavity 11, bottom the first air cavity 11, is provided with fuel cell alcohol sensor 16, in the first air cavity 11 and the second air cavity 12, be designed with heating module 15 and temperature sensor 26。Pressure transducer detects the air pressure in the first air cavity, and microprocessor is modified according to the alcohol content numerical value of the atmospheric pressure value gas to calculating。Heating module in first air cavity controls the temperature in this air cavity, heating module in second air cavity controls the temperature in this air cavity, and during detection, the first air cavity and the temperature in the second air cavity maintain same setting value, processed by constant temperature, get rid of the temperature impact on detection data。Fuel cell alcohol sensor can also be passed through and detect the alcohol concentration of gas to be measured。
The detection method of a kind of alcohol content tester of the present embodiment, comprises the following steps:
S1: the gas of measured's exhalation enters the first air cavity by air inlet, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor；
S2: voltage signal U1 and voltage signal U2 is substituted into alcohol content formula C=-1/KL (lnU in gas by microprocessor1-lnU2+ A), calculate the alcohol content C of gas in the first air cavity, wherein, K is the absorbed proportionality coefficient of light, and L is the length of the first air cavity, and A is known parameters, and display screen shows the gaseous alcohol content C calculated。
In gas, alcohol content formula is obtained by following steps:
N1: pass into, in the first air cavity, the gas that alcohol content is known, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor；
N2: assume that the light intensity that infrared light supply penetrates is I0Infrared light, then the light intensity I of the emergent light of the first air cavity1=I0Exp (-KCL), the light intensity I of the emergent light of the second air cavity2=I0, obtain equation below:
U1=M1·I0Exp (-KCL)；
U2=M2·I0；
Wherein, M1 is the scale factor of the first air cavity, and M2 is the scale factor of the second air cavity, above-mentioned two formula is asked ratio, obtains U1/U2=M1/M2Exp (-KCL), thus obtaining C=-1/KL (lnU1-lnU2+lnM2-lnM1), setting parameter A=lnM2-lnM1, obtain C=-1/KL (lnU1-lnU2+ A)；
Due to, K, L, C are known parameters, and microprocessor can calculate the value of parameter A according to voltage signal U1 and voltage signal U2。
N3: prepare the gas of different alcohol content, successively the gas of different alcohol contents is passed into the first air cavity, adopt step N1 to step N2 that the different ethanol content gas passed in the first air cavity are detected, obtain the value of multiple parameter A, then the value of the multiple parameter A obtained is averaged, using this meansigma methods final numerical value as parameter A, finally give alcohol content formula C=-1/KL (lnU in gas1-lnU2+ A), wherein, K is the absorbed proportionality coefficient of light, and L is the length of the first air cavity, and A is known parameters, and U1 is the voltage that Infrared Detectors detects the first air cavity emergent light light intensity output, and U2 is the voltage that Infrared Detectors detects the second air cavity emergent light light intensity output。
Fingerprint identification module identification measured's fingerprint, the position of GPS module detection alcohol content tester, the driver license number of input through keyboard measured, alcohol concentration C in the gas that detection is obtained, measured's finger print information, the positional information binding storage of the driver license number of measured and GPS module detection is in the memory unit, these data are sent to Cloud Server by wireless communication module, Cloud Server searches whether database authentication driver license number mates with finger print information, if coupling, by alcohol concentration C in the gas of detection, the positional information binding storage of the driver license number of measured and GPS module detection, and send and be proved to be successful information to alcohol content tester, if do not mated, then by alcohol concentration C in the gas of detection, the positional information binding storage of measured's finger print information and GPS module detection, and send authentication failed information to alcohol content tester。Prevent the situation that measured is not inconsistent with driver's license。
Infrared detecting device carries out continuous detecting, display screen display testing result curve。Intercept the meansigma methods of the testing result between the 5-7 second of exhaling according to testing result curve and as measured's expiration alcohol concentration or gas flow sensor is detected, and the meansigma methods of incoming call gas flow testing result between set point Q1-Q2 is as measured's expiration alcohol concentration, display screen display data above。Substantial amounts of statistical study result shows, there are a kind of stable relations in the internal gas having only in alveolar and blood in alcohol concentration, so only by analyzing the gas of exhalation from alveolar, the quantification result of expiration alcohol concentration or BAC just can be obtained。Reaching more than three seconds if exhaled with medium dynamics after the deep air-breathing of measured, the gas at this moment breathed out is exactly from deep lung gas out；If gas flow sensor detects incoming call, gas flow exceedes setting value, then the gas at this moment breathed out is exactly from deep lung gas out。
Claims (10)
1. an alcohol content tester, it is characterized in that: include microprocessor (1), display screen (2) and infrared detecting device, described infrared detecting device includes drive circuit (3), air chamber (4) and signal processing circuit (28), described air chamber (4) is respectively arranged at two ends with infrared light supply (5) and Infrared Detectors (6), described air chamber (4) is additionally provided with air inlet (7) and gas outlet (8), described gas outlet (8) is provided with fan (9), described drive circuit (3) electrically connects with infrared light supply (5), described Infrared Detectors (6) electrically connects with the input of signal processing circuit (28), described microprocessor (1) respectively with display screen (2), the control end of drive circuit (3), the outfan of signal processing circuit (28) and fan (9) electrical connection。
2. a kind of alcohol content tester according to claim 1, it is characterised in that: described infrared light supply (5) rear side is provided with concave mirror, and described infrared light supply (5) is positioned at the focal point of concave mirror (10)。
3. a kind of alcohol content tester according to claim 2, it is characterized in that: described air chamber (4) is divided into and being parallel to each other and the first air cavity (11) that length is equal and the second air cavity (12), described first air cavity (11) does not connect with the second air cavity (12), two test sides of described Infrared Detectors (6) lay respectively at the end of the first air cavity (11) and the end of the second air cavity (12), the infrared light that described infrared light supply (5) sends is parallel after concave mirror (10) reflects injects the first air cavity (11) and the second air cavity (12), described air inlet (7) connects with the first air cavity (11) with gas outlet (8)。
4. a kind of alcohol content tester according to claim 1 or 2 or 3, it is characterized in that: described air inlet (7) place is provided with gas flow sensor (13), and described gas flow sensor (13) electrically connects with microprocessor (1)。
5. a kind of alcohol content tester according to claim 1 or 2 or 3, it is characterized in that: be additionally provided with heating module (15) and temperature sensor (26), described heating module (15) and temperature sensor (26) in described air chamber (4) and electrically connect with microprocessor (1) respectively。
6. a kind of alcohol content tester according to claim 3, it is characterized in that: described first air cavity (11) bottom is provided with fuel cell alcohol sensor (16), and described fuel cell alcohol sensor (16) electrically connects with microprocessor (1)。
7. a kind of alcohol content tester according to claim 1 or 2 or 3, it is characterised in that: also including memory element (22), described memory element (22) electrically connects with microprocessor (1)。
8. a detection method for alcohol content tester, a kind of alcohol content tester described in claim 3, it is characterised in that comprise the following steps:
S1: the gas of measured's exhalation enters the first air cavity by air inlet, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor；
S2: voltage signal U1 and voltage signal U2 is substituted into alcohol content formula C=-1/KL (lnU in gas by microprocessor1-lnU2+ A), calculate the alcohol content C of gas in the first air cavity, wherein, K is the absorbed proportionality coefficient of light, and L is the length of the first air cavity, and A is known parameters, and display screen shows the gaseous alcohol content C calculated。
9. the detection method of a kind of alcohol content tester according to claim 8, it is characterised in that in described gas, alcohol content formula is obtained by following steps:
N1: pass into, in the first air cavity, the gas that alcohol content is known, microprocessor drives infrared source working by drive circuit, the infrared light that infrared light supply sends is parallel after concave mirror injects the first air cavity and the second air cavity, Infrared Detectors detects the light intensity of the first air cavity emergent light and the light intensity of the second air cavity emergent light respectively, and export voltage signal U1 with the light intensity of the second air cavity emergent light corresponding voltage signal U2 corresponding with the light intensity of the first air cavity emergent light, signal processing circuit the signal that Infrared Detectors exports is processed after input microprocessor；
N2: assume that the light intensity that infrared light supply penetrates is I0Infrared light, then the light intensity I of the emergent light of the first air cavity1=I0Exp (-KCL), the light intensity I of the emergent light of the second air cavity2=I0, obtain equation below:
U1=M1·I0Exp (-KCL)；
U2=M2·I0；
Wherein, M1 is the scale factor of the first air cavity, and M2 is the scale factor of the second air cavity, above-mentioned two formula is asked ratio, obtains U1/U2=M1/M2Exp (-KCL), thus obtaining C=-1/KL (lnU1-lnU2+lnM2-lnM1), setting parameter A=lnM2-lnM1, obtain C=-1/KL (lnU1-lnU2+ A)；
Due to, K, L, C are known parameters, and microprocessor can calculate the value of parameter A according to voltage signal U1 and voltage signal U2, finally give alcohol content formula C=-1/KL (lnU in gas1-lnU2+ A), wherein, K is the absorbed proportionality coefficient of light, and L is the length of the first air cavity, and A is known parameters, and U1 is the voltage that Infrared Detectors detects the first air cavity emergent light light intensity output, and U2 is the voltage that Infrared Detectors detects the second air cavity emergent light light intensity output。
10. the detection method of a kind of alcohol content tester according to claim 8, it is characterized in that, also include step N3: prepare the gas of different alcohol content, successively the gas of different alcohol contents is passed into the first air cavity, adopt step N1 to step N2 that the different ethanol content gas passed in the first air cavity are detected, obtain the value of multiple parameter A, then the value of the multiple parameter A obtained is averaged, using this meansigma methods final numerical value as parameter A。
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