CN101042408B - Portable electric nose system based on USB interface - Google Patents
Portable electric nose system based on USB interface Download PDFInfo
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- CN101042408B CN101042408B CN200710067946XA CN200710067946A CN101042408B CN 101042408 B CN101042408 B CN 101042408B CN 200710067946X A CN200710067946X A CN 200710067946XA CN 200710067946 A CN200710067946 A CN 200710067946A CN 101042408 B CN101042408 B CN 101042408B
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- 239000003990 capacitor Substances 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000013480 data collection Methods 0.000 abstract 6
- 238000000034 method Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 33
- 230000035943 smell Effects 0.000 description 15
- 239000012159 carrier gas Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000009418 agronomic effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008786 sensory perception of smell Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
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Abstract
This invention discloses one portable electron nose system based on USB interface, whose smell test and data collection system comprises gas sensitive sensor array with gas input end connected to two electrical valve through three-way tube and two electromagnetic valve; wherein, its signal output end is connected to the data collection card through signal adjust; the data collection card output end is connected to computer through USB interface; gas control system comprises data collection card with output end connected to gas pump of switch circuit; in work, the computer opens gas pump by data collection card according to program firstly to switch gas path to smell collection status to convert the smell into electrical signals by data collection card to computer for process; the collection time is to switch gas path to clear status to delete the smell molecule for next collection.
Description
Technical field
What the present invention relates to is the detecting instrument of diseases and pests of agronomic crop and quality of agricultural product, is specifically related to a kind of USB interface-based portable electric nose system.
Background technology
The different maturity stages of crops, the different periods of expansion of crop disease and insect, the different shelf times of food etc. all have different volatile matters to produce, and these volatile matters are enough to allow gas sensor that tangible response is arranged, and make Electronic Nose can detect and distinguish identification.The aroma quality of normal food is to evaluate by people's sense of smell impression on the other hand, subjective appreciation mainly relies on what mental condition of physiology of people, the accuracy of evaluation result often is difficult to guarantee, development along with sensor technology and microcomputer, Electronic Nose is as testing tool, and prospect is very wide, but present used Electronic Nose function singleness, bulky inconvenience is carried, and especially can't take the field to and carry out the smell collection.
Summary of the invention
The purpose of this invention is to provide that price is low, volume is little, portable a kind of USB interface-based portable electric nose system.
In order to achieve the above object, the technical solution used in the present invention is as follows:
It comprises smell acquisition control system, signal condition unit, data acquisition system (DAS), computing machine, two solenoid valves and air pump; The smell acquisition control system connects data acquisition system (DAS) through the signal condition unit, and data acquisition system (DAS) is connected with air pump with computing machine, first solenoid valve, second solenoid valve respectively.
In the described smell acquisition control system:
Gas sensor array is made up of eight different gas sensors respectively, and it is indoor to be encapsulated in sensor response, sensor reaction chamber links to each other with air pump, air pump links to each other with second solenoid valve with first solenoid valve respectively by threeway, the first solenoid valve other end feeds sampling receptacle, and the second solenoid valve other end is carried the air-capacitor device;
Gas sensor array: comprise eight different gas sensors, 1,3 pin of first gas sensor connect power supply E2 positive pole after linking to each other, 4,6 pin of first gas sensor connect power supply E2 negative pole by resistance R Q1 after linking to each other, 2 pin of first gas sensor connect power supply E1 positive pole, 5 pin of first gas sensor connect power supply E1 negative pole, capacitor C Q1 and resistance R Q1 also connect, 4 pin of first gas sensor meet corresponding signal orderliness circuit input end IN1, and the connected mode of other seven gas sensors and first gas sensor are identical.
In the described signal condition unit: first input end IN1 of the first via connects the input end in the same way of corresponding integrated operational amplifier OP1, first resistance R 1 and the 5th resistance R t also connect the back first termination power E2 positive pole, second termination, second resistance R 2, second end of second resistance R 2 connects power supply E2 negative pole by the 3rd resistance R 3, the reverse input end of integrated operational amplifier OP1 links to each other with second end of second resistance R 2 and first end of the 4th resistance R 4 respectively, second end of the 4th resistance R 4 and the output terminal of integrated operational amplifier OP1 join, the output terminal of capacitor C 1 one ends and integrated operational amplifier OP1 joins, another termination power E2 negative pole, the output terminal of integrated operational amplifier OP1 links to each other with first input end Ai1 of data acquisition system (DAS) again, and the connected mode and the first via of other seven road signal conditions unit are identical.
In the described data acquisition system (DAS): eight input end Ai1～Ai8 of data collecting card link to each other with the output terminal of eight integrated operational amplifiers in the signal condition unit respectively, the USB interface and the USB interface of computer of data collecting card are joined, the first output terminals A O1 of data collecting card connects first transistor base by the 6th resistance R T1, first transistor collector connects first relay, the first relay other end with meet power supply VCC after first solenoid valve links to each other, the first solenoid valve other end is through the normally opened contact of first relay and ground connection after first transistor emitter links to each other; The second output terminals A O2 of data collecting card connects the 7th transistor base by the second resistance R T2, second transistor collector connects second relay, the second relay other end with meet power supply VCC after second solenoid valve links to each other, the second solenoid valve other end is through the normally opened contact of second relay and ground connection after second transistor emitter links to each other; The 3rd output terminals A O3 of data collecting card connects the 3rd transistor base by the 8th resistance R T3, the 3rd transistor collector connects the 3rd relay, the 3rd relay other end with meet power supply VCC after air pump links to each other, the air pump other end is through the normally opened contact of the 3rd relay and ground connection after the 3rd transistor emitter links to each other.
The useful effect that the present invention has is:
Whole smell collection is by computer controlled automatic, after sample placed closed container, treat that the top air reaches balance, the computer control data collecting card is opened air pump, earlier gas circuit being switched to the smell acquisition state imports the head space gas in the container in the sensor array reaction chamber into, by gas sensor array smell being converted to electric signal passes to computing machine by data collecting card and carries out analyzing and processing, acquisition time switches to gas circuit the cleaning state later again, and the scent molecule that the suction carrier gas will be adsorbed on the gas sensor array is removed so that gather next time.But the present invention has the overlapping development ability, can form new sensor array as long as change one or several sensor, rebulids mathematical model at new application, easily different odor is carried out collection analysis.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
The schematic circuit that Fig. 2 sensor array of the present invention connects;
Fig. 3 signal condition schematic circuit;
Fig. 4 data acquisition system (DAS) schematic circuit
Embodiment
As shown in Figure 1, it comprises smell acquisition control system U1, signal condition unit U2, data acquisition system (DAS) U3, computing machine U4, two solenoid valve F1, F2 and air pump B; Smell acquisition control system U1 meets data acquisition system (DAS) U3 through signal condition unit U2, and data acquisition system (DAS) U3 is connected with air pump B with computing machine U4, the first solenoid valve F1, the second solenoid valve F2 respectively.
As shown in Figure 1, among the described smell acquisition control system U1:
Gas sensor array QZ is made up of eight different gas sensors respectively, and be encapsulated in the sensor reaction chamber H, sensor reaction chamber H links to each other with air pump B, air pump B links to each other with the second solenoid valve F2 with the first solenoid valve F1 respectively by threeway T, the first solenoid valve F1 other end feeds sampling receptacle, and the second solenoid valve F2 other end is carried the air-capacitor device;
As shown in Figure 2, gas sensor array QZ: comprise eight different gas sensor Q1～Q8,1 of the first gas sensor Q1,3 pin connect power supply E2 positive pole after linking to each other, 4 of the first gas sensor Q1,6 pin connect power supply E2 negative pole by resistance R Q1 after linking to each other, 2 pin of the first gas sensor Q1 connect power supply E1 positive pole, 5 pin of the first gas sensor Q1 connect power supply E1 negative pole, capacitor C Q1 and resistance R Q1 also connect, 4 pin of the first gas sensor Q1 meet corresponding signal orderliness circuit input end IN1, and the connected mode of other seven gas sensors and the first gas sensor Q1 are identical.
As shown in Figure 3, among the described signal condition unit U2: first input end IN1 of the first via connects the input end in the same way of corresponding integrated operational amplifier OP1, first resistance R 1 and the 5th resistance R t also connect the back first termination power E2 positive pole, second termination, second resistance R 2, second end of second resistance R 2 connects power supply E2 negative pole by the 3rd resistance R 3, the reverse input end of integrated operational amplifier OP1 links to each other with second end of second resistance R 2 and first end of the 4th resistance R 4 respectively, second end of the 4th resistance R 4 and the output terminal of integrated operational amplifier OP1 join, the output terminal of capacitor C 1 one ends and integrated operational amplifier OP1 joins, another termination power E2 negative pole, the output terminal of integrated operational amplifier OP1 links to each other with first input end Ai1 of data acquisition system (DAS) U3 again, and the connected mode and the first via of other seven road signal conditions unit are identical.
As shown in Figure 4, among the described data acquisition system (DAS) U3: eight input end Ai1～Ai8 of data collecting card K1 link to each other with the output terminal of eight integrated operational amplifiers in the signal condition unit U2 respectively, the USB interface of the USB interface of data collecting card K1 and computing machine U4 is joined, the first output terminals A O1 of data collecting card K1 connects first triode T1 base stage by the 6th resistance R T1, first triode T1 collector connects first relay J 1, first relay J, 1 other end with meet power supply VCC after the first solenoid valve F1 links to each other, the first solenoid valve F1 other end is through the normally opened contact of first relay J 1 and ground connection after first triode T1 emitter links to each other; The second output terminals A O2 of data collecting card K1 connects second triode T2 base stage by the 7th resistance R T2, second triode T2 collector connects second relay J 2, second relay J, 2 other ends with meet power supply VCC after the second solenoid valve F2 links to each other, the second solenoid valve F2 other end is through the normally opened contact of second relay J 2 and ground connection after second triode T2 emitter links to each other; The 3rd output terminals A O3 of data collecting card K1 connects the 3rd triode T3 base stage by the 8th resistance R T3, the 3rd triode T3 collector connects the 3rd relay J 3, the 3rd relay J 3 other ends with meet power supply VCC after air pump B links to each other, the air pump B other end is through the normally opened contact of the 3rd relay J 3 and ground connection after the 3rd triode T3 emitter links to each other.
During system works, computing machine U4 by data collecting card K1 control air pump B and the first solenoid valve F1 with in the gas suction sensor reaction chamber H, because different gas sensors is to the susceptibility difference of different odor, make its output voltage also different, the sensor array QZ that is made up of eight gas sensors can produce eight different output voltages after signal condition unit U2 handles, these voltages are adopted by data collecting card K1 and are formed a kind of smell information fingerprint figure in the computing machine U4, the corresponding a kind of information fingerprint figure of a kind of smell, computing machine U4 forms database with the information fingerprint figure of various smells after " training ", which kind of smell judges thus in the suction sensor reaction chamber H is, last computing machine U4, removes the scent molecule that is adsorbed on the gas sensor array so that gather next time with in the carrier gas suction sensor reaction chamber H by data collecting card K1 control air pump B and the second solenoid valve F2.
The present invention includes smell acquisition control system U1, signal condition unit U2, data acquisition system (DAS) U3, computing machine U4, wherein: the gas sensor array among the acquisition control system U1 can be selected MQ-3 for use, TGS822, MQ-7, TGS800, TGS824, TGS813, TGS880, the TGS825 sensor is formed, sensor array is evenly distributed in the sensor reaction chamber H, sensor reaction chamber H is made up of closed container, air pump adopts 5 volts of micro air pumps, solenoid valve adopts 5 incubative pathogen body solenoid valves, integrated operational amplifier among the signal condition unit U2 can be selected the high-gain low noise amplifier for use, data collecting card is selected the USB2006 of NI company type data collecting card for use among the data acquisition system (DAS) U3, and computing machine U4 can select notebook computer for use.
Claims (3)
1. USB interface-based portable electric nose system is characterized in that: it comprises smell acquisition control system (U1), signal condition unit (U2), data acquisition system (DAS) (U3), computing machine (U4), two solenoid valves (F1, F2) and air pump (B); Smell acquisition control system (U1) connects data acquisition system (DAS) (U3) through signal condition unit (U2), and data acquisition system (DAS) (U3) is connected with computing machine (U4), first solenoid valve (F1), second solenoid valve (F2) and air pump (B) respectively; One end of air pump (B) links to each other with second solenoid valve (F2) with first solenoid valve (F1) respectively by threeway (T), first solenoid valve (F1) other end feeds sampling receptacle, second solenoid valve (F2) other end is carried the air-capacitor device, and the other end of air pump (B) feeds the sensor reaction chamber (H) in the smell acquisition control system (U1);
In the described data acquisition system (DAS) (U3): used data collecting card (K1) model is USB-6009, eight input end Ai1～Ai8 of data collecting card (K1) link to each other with the output terminal of eight integrated operational amplifiers in signal condition unit (U2) respectively, the USB interface of the USB interface of data collecting card (K1) and computing machine (U4) is joined, the first output terminals A O1 of data collecting card (K1) connects first triode (T1) base stage by the 6th resistance R T1, first triode (T1) collector connects first relay (J1), first relay (J1) other end with meet power supply VCC after first solenoid valve (F1) links to each other, first solenoid valve (F1) other end is through the normally opened contact of first relay (J1) and ground connection after first triode (T1) emitter links to each other; The second output terminals A O2 of data collecting card (K1) connects second triode (T2) base stage by the 7th resistance R T2, second triode (T2) collector connects second relay (J2), second relay (J2) other end with meet power supply VCC after second solenoid valve (F2) links to each other, second solenoid valve (F2) other end is through the normally opened contact of second relay (J2) and ground connection after second triode (T2) emitter links to each other; The 3rd output terminals A O3 of data collecting card (K1) connects the 3rd triode (T3) base stage by the 8th resistance R T3, the 3rd triode (T3) collector connects the 3rd relay (J3), the 3rd relay (J3) other end with meet power supply VCC after air pump (B) links to each other, air pump (B) other end is through the normally opened contact of the 3rd relay (J3) and ground connection after the 3rd triode (T3) emitter links to each other.
2. USB interface-based portable electric nose system according to claim 1 is characterized in that in the described smell acquisition control system (U1):
Gas sensor array (QZ) is made up of the gas sensor of eight 6 pins respectively, and is encapsulated in the sensor reaction chamber (H), and sensor reaction chamber (H) links to each other with air pump (B), and gas sensor array (QZ) joins with signal condition unit (U2);
Gas sensor array (QZ): the gas sensor (Q1～Q8) that comprises eight 6 pins, first gas sensor (Q1) is selected MQ-3 for use, 1 of first gas sensor (Q1), 3 pin connect power supply E2 positive pole after linking to each other, 4 of first gas sensor (Q1), 6 pin connect power supply E2 negative pole by resistance R Q1 after linking to each other, 2 pin of first gas sensor (Q1) connect power supply E1 positive pole, 5 pin of first gas sensor (Q1) connect power supply E1 negative pole, capacitor C Q1 is in parallel with resistance R Q1,4 pin of first gas sensor (Q1) meet corresponding signal modulate circuit input end IN1, other seven gas sensors are selected TGS822 respectively for use, MQ-7, TGS800, TGS824, TGS813, TGS880, TGS825, the pin label of these 7 gas sensors is identical, the pin function of same numeral is identical with first gas sensor (Q1), so connected mode is also identical with first gas sensor (Q1).
3. USB interface-based portable electric nose system according to claim 1, it is characterized in that in the described signal condition unit (U2): first input end IN1 of the first via connects the input end in the same way of corresponding integrated operational amplifier OP1, first resistance R 1 and the first termination power E2 positive pole after the 5th resistance R t is in parallel, second termination, second resistance R 2, second end of second resistance R 2 connects power supply E2 negative pole by the 3rd resistance R 3, the reverse input end of integrated operational amplifier OP1 links to each other with second end of second resistance R 2 and first end of the 4th resistance R 4 respectively, second end of the 4th resistance R 4 and the output terminal of integrated operational amplifier OP1 join, the output terminal of capacitor C 1 one ends and integrated operational amplifier OP1 joins, another termination power E2 negative pole, the output terminal of integrated operational amplifier OP1 links to each other with first input end Ai1 of data acquisition system (DAS) (U3) again, the connected mode and the first via of other seven road signal conditions unit are identical, and the output terminal of integrated operational amplifier separately links to each other with the corresponding input end Ai2-Ai8 of data acquisition system (DAS) (U3) again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710067946XA CN101042408B (en) | 2007-04-10 | 2007-04-10 | Portable electric nose system based on USB interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710067946XA CN101042408B (en) | 2007-04-10 | 2007-04-10 | Portable electric nose system based on USB interface |
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| CN101042408A CN101042408A (en) | 2007-09-26 |
| CN101042408B true CN101042408B (en) | 2010-08-25 |
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| CN200710067946XA Expired - Fee Related CN101042408B (en) | 2007-04-10 | 2007-04-10 | Portable electric nose system based on USB interface |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788440B (en) * | 2010-01-15 | 2011-12-28 | 清华大学 | Electronic nose used for food safety monitoring |
| CN101893591A (en) * | 2010-06-24 | 2010-11-24 | 浙江大学 | Electronic nose system for banana quality detection |
| CN102192927B (en) * | 2010-11-05 | 2012-09-26 | 重庆大学 | Air-quality monitoring system based on electronic nose technique, and monitoring method thereof |
| CN102279213B (en) * | 2011-07-20 | 2013-01-30 | 浙江大学 | Method for rapid diagnosis of crop disease by volatile matter |
| CN103592358A (en) * | 2012-11-30 | 2014-02-19 | 淮南师范学院 | Electronic nose for detection of underground coal mine air quality |
| CN103512922A (en) * | 2013-08-01 | 2014-01-15 | 浙江工商大学 | Electrical fire detection system and method based on electronic nose system |
| CN104089987A (en) * | 2013-11-14 | 2014-10-08 | 浙江工商大学 | Portable frozen beef product quality detection device and detection method using the same |
| CN104089989A (en) * | 2013-11-14 | 2014-10-08 | 浙江工商大学 | Device and method for edible oil quality detection |
| CN104713985B (en) * | 2013-12-17 | 2016-08-17 | 淮安信息职业技术学院 | A kind of Minepit environment harmful gas detection system based on wireless senser |
| CN105866190A (en) * | 2016-05-27 | 2016-08-17 | 南京信息工程大学 | Electronic nose device for food detection and detection method |
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- 2007-04-10 CN CN200710067946XA patent/CN101042408B/en not_active Expired - Fee Related
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| CN1367381A (en) * | 2002-03-15 | 2002-09-04 | 上海慧比智能科技有限公司 | Olfactory simulator and its olfactory simulation testing method |
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