A method, system and alarm system for odor recognition based on electronic nose

A recognition method and electronic nose technology, which can be used in character and pattern recognition, instruments, measuring devices, etc., can solve the problems of small thermal mass and the influence of temperature, and achieve the purpose of reducing calculation errors, improving accuracy, and reducing time. Effect

Active Publication Date: 2022-01-07
苏州慧闻纳米科技有限公司 +1
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  • Application Information

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Problems solved by technology

However, due to its small size, this sensor also has a very small thermal mass, which is easily affected by the airflow temperature in the application, so the method of rising or falling slope of the curve will be greatly disturbed by environmental factors, and the response peak rises Or the slope of the rising or falling slope of the response curve used in the falling period is not suitable for direct use as a characteristic value

Method used

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  • A method, system and alarm system for odor recognition based on electronic nose
  • A method, system and alarm system for odor recognition based on electronic nose
  • A method, system and alarm system for odor recognition based on electronic nose

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Embodiment 1

[0065] An electronic nose is an electronic system that uses the response pattern of an array of gas sensors to identify odors. The core device of the electronic nose is the gas sensor. According to different principles, gas sensors can be divided into many types such as metal oxide type, electrochemical type, conductive polymer type, mass type, and photoionization type. The most widely used is the metal oxide type. The type of the gas sensor in the electronic nose in the embodiment of the present invention is not limited, and can be selected according to actual needs.

[0066] In step S100, each gas sensor collects data at regular intervals in the ambient atmosphere, and the collected data changes with time, so that a response curve of the response value with time can be drawn. Data collected at different times correspond to different sampling points. During the gas identification process, all gas sensors in the electronic nose are in working condition. In one embodiment, ...

Embodiment 2

[0092] The difference between the second embodiment and the first embodiment lies only in step S400. In the step S400, n≥1, including:

[0093] Step 1), judge t 0 Whether all the gas sensors having the peak-onset feature at any moment have at least one gas sensor set, each of which includes at least one second gas sensor, and each of the gas sensor sets is configured to be able to determine the target The smell must contain or must not contain one or several gases;

[0094] Step 2), after determining that there is at least one gas sensor set, according to each of the gas sensor sets, divide the target odor into a third gas set that must contain or must not contain one or several gases and a fourth gas set, the sum of the third gas set and the fourth gas set is all possible gas sets in the target odor, and the third gas set includes the gas determined by the second gas sensor all possible sets of

[0095] Step 3), judge t 0 +iΔt 0 Whether there is at least one target gas ...

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Abstract

The invention provides an electronic nose-based odor recognition method, system and alarm system. The odor recognition method includes: obtaining the response value data of each gas sensor at different sampling points; judging whether at least one gas sensor has a peak characteristic according to the response value data of different sampling points; Timing, every preset time period Δt to judge whether other gas sensors have peak characteristics; according to the gas sensors with peak characteristics at each moment, determine the gas that must be included or not necessarily contained in the target odor at the corresponding moment, so as to Determine the target gas set that must contain or must not contain the gas from a variety of gas sets; select a classification algorithm according to the target gas set, and determine the gas of the target gas from the target gas set according to the selected classification algorithm type. The solution of the invention can quickly and accurately identify the gas type.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to an electronic nose-based odor recognition method, system and alarm system. Background technique [0002] Devices that use gas sensor arrays to identify gases or odors are referred to as electronic noses. Electronic noses are currently widely used in gas and odor identification and detection in various industries. There are various types of sensors used in electronic noses, but in consideration of sensitivity and price factors, resistive sensors, especially metal oxide semiconductor sensors, are the most commonly used. [0003] But for some special industries, such as toxic and harmful, flammable and explosive, and some military industries, the response time of odor is an important factor that must be considered. In this type of application, if the target gas cannot be identified and alarmed in time, no matter how accurate the detection is, it will be meaningless. However, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00G06K9/62
CPCG01N33/0063G06F18/241
Inventor 吴泓毅沈永玲张书敏鲁一江吴庆乐杨霄李一鹏李建刘国宏吴为辉周蕾甄宏玲
Owner 苏州慧闻纳米科技有限公司
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