Electronic nose gas identification method based on source domain transfer limit learning drift compensation

Abstract

The invention provides an electronic nose gas identification method based on source domain migration extreme learning to realize drift compensation. According to the source domain migration extreme learning to realize drift compensation, a source domain migration extreme learning machine framework is proposed from the perspective of machine learning and used for solving the problem of sensor drift instead of direct correction for single sensor response; a source domain data set and a target domain data set are built according to labeled gas sensor array sense data matrixes collected by an electronic nose before drift and after drift respectively and are taken as inputs of an extreme learning machine for training an identification classifier of the electronic nose, so that the tolerance performance of the identification classifier on gas identification after the electronic nose drifts is improved, and the purposes of drift compensation and gas identification precision improvement are achieved; besides, technical advantages of the extreme learning machine are kept, and accordingly, the method has better generalization performance and migration performance. Therefore, based on the source domain migration extreme learning machine framework provided by the invention, one learning framework with good learning capacity and generalization capacity is built.

Description

technical field [0001] The invention relates to the technical field of electronic nose detection, in particular to an electronic nose gas identification method based on source domain migration limit learning drift compensation. Background technique [0002] An electronic nose is an intelligent electronic device or artificial olfactory system that uses the response map of a gas sensor array to identify gases. Due to the crossover characteristics and broad spectrum of gas sensor arrays in electronic noses, the gas recognition capabilities of electronic noses are widely used in medical diagnosis, tea quality assessment, environmental detection, and gas concentration prediction. [0003] However, the gas sensor of the electronic nose is aging continuously with the increase of usage time, which greatly shortens the service life of the gas sensor array of the electronic nose. Poisoning, aging or environmental variables can cause the gas sensor drift of the electronic nose, and th...

AI Technical Summary

Problems solved by technology

[0006] A typical multivariate component correction method is the component correction principal component analysis method, which uses principal component analysis to find the drift direction, thereby removing the drift component; however, the compensation idea of ​​the component correction principal component analysis method needs to be based on the drift of all categories of data However, the actual drift of the electronic nose is not the case, so it is difficult to effectively apply this method to the drift compensation of the electronic nose; and if a multiplier correction is added on the basis of the component correction principal component analysis method Variables are used to improve the consistency limitation of the data drift direction, and the generalization of its drift compensation will be restricted by the nonlinear dynamic characteristics of the gas sensor in online applications, making it difficult for its drift compensation effect to be specific to different Suitable for a wide range of gas identification applications

[0007] The adjustment compensation method is to adjust the difference in the distribution of the sensing features by adjusting the response changes of the gas sensor array of the electronic nose during gas recognition and detection at different stages, thereby realizing drift compensation; When the gas sensor array of the electronic nose has a transient response, it is misjudged that the gas sensor array is undergoing drastic changes in drift, and then frequently adjusted and compensated, it is easy to disrupt the original eigenvalue distribution of the gas sensor array of the electronic nose. As a result, the original relatively accurate identification neural network cannot correctly identify its matching gas after drift compensation, which affects the gas identification accuracy of the electronic nose

[0008] Previously, researchers have also carried out some research on the drift compensation of electronic noses through machine learning methods, but the machine learning methods currently used are mainly based on support vector machines, which often require a large number of training samples for learning. In the case of limited training samples, the compensation effect is not good, and the gas recognition accuracy of the electronic nose cannot be improved through drift compensation. In addition, this type of machine learning method usually needs to train many base classifiers, so its domain migration ability and generalization sex is restricted

[0009] To sum up, in the existing technology, the compensation method for the drift of the electronic nose gas sensor generally has the problems of low gas recognition accuracy, poor migration ability and generalization of the electronic nose after compensation.

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