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Portable intelligent electronic nose and its preparing process

An electronic nose, portable technology, applied in the direction of character and pattern recognition, material analysis through electromagnetic means, material inspection products, etc., can solve the problems of expensive, large electronic nose test equipment, etc., to achieve volume reduction, strong recognition and Anti-interference, qualitative and quantitative capabilities, and highly targeted effects

Inactive Publication Date: 2002-11-27
FUDAN UNIV
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Problems solved by technology

There are currently several commercialized electronic noses, but these commercial electronic nose test instruments are bulky and expensive
Can not meet the current domestic demand for more and more on-site, portable analytical instruments

Method used

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  • Portable intelligent electronic nose and its preparing process
  • Portable intelligent electronic nose and its preparing process
  • Portable intelligent electronic nose and its preparing process

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example

[0039] For the embodiment structure of JFZ 89 SC-2 intelligent alcohol electronic nose, see Figure 4 :

[0040] The smart electronic nose is specifically manufactured using a metal oxide gas sensor array (the four semiconductor oxide sensor models produced by Beijing Dongfang Electronics Co., Ltd. are 2M004, MQK1, MQK2, 2M007), signal conditioning voltage circuit, and realized by a single-chip microcomputer MC68HC705SR3 A feed-forward artificial neural network pattern recognition system. First mix the series concentration (alcohol gas from 0 to 1mg / l) and interfering gas (2mg / l n-hexane, 4mg / l n-hexane, 400mg / l water vapor, 2mg / l n-hexane and 0.0619mg / l alcohol gas, a mixture of 400mg / l water vapor and 0.0619mg / l alcohol) into the sensor array, the resulting response is preprocessed by the conditioning circuit, and finally the signal set is divided into two groups, the training set and the prediction set, and the training set Send it into the artificial neural network progr...

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Abstract

A portable intelligent electronic nose for recognizing gas and its preparing method feature use of 4-8 sensor arrays whose signal output is serially sent to a regulator circuit, a pattern recognizer and a computer. The pattern recognition and non-linear fitting of nerve cell network, the artificial nerve network model with forward transfer, and the training algorithm with backward transfer of error are used. The electronic nose can detect one or several gases in the range of selected sensors and further possess the function of quantitative analysis.

Description

technical field [0001] The invention is a novel portable gas and odor analysis tester. Background technique [0002] An electronic nose is an instrument consisting of a sensor array olfaction and an appropriate pattern recognition system capable of recognizing simple or complex odors. A single sensor in an electronic nose is nonspecific in response, capable of broad-spectrum responses to a variety of gases. Due to the inevitable shortcomings of the sensor itself, the mixed composition of the gas will cause great interference to the sensor for single parameter measurement, the measurement error is often difficult to control, and the performance of the instrument will be greatly limited. An effective way to improve the anti-interference ability is to use combined or array multi-sensors and the principle of artificial smell, that is, electronic nose technology. In the past ten years, the electronic nose has been developed rapidly as a new type of analytical instrument, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00
CPCG06N3/065
Inventor 温丽菁张良谊周峰卞利萍陆宇张松杨芃原张健张申雄沈方达
Owner FUDAN UNIV
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