A Novel Gas Recognition Algorithm for Gas Sensor Array Combining Savitzky-Golay Smooth and Image Conversion Route

In recent years, the application of Deep Neural Networks to gas recognition has been developing. The classification performance of the Deep Neural Network depends on the efficient representation of the input data samples. Therefore, a variety of filtering methods are firstly adopted to smooth filter the gas sensing response data, which can remove redundant information and greatly improve the performance of the classifier. Additionally, the optimization experiment of the Savitzky-Golay filtering algorithm is carried out. After that, we used the Gramian Angular Summation Field (GASF) method to encode the gas sensing response data into two-dimensional sensing images. In addition, data augmentation technology is used to reduce the impact of small sample numbers on the classifier and improve the robustness and generalization ability of the model. Then, combined with fine-tuning of the GoogLeNet neural network, which owns the ability to automatically learn the characteristics of deep samples, the classification of four gases has finally been realized: methane, ethanol, ethylene, and carbon monoxide. Through setting a variety of different comparison experiments, it is known that the Savitzky-Golay smooth filtering pretreatment method effectively improves the recognition accuracy of the classifier, and the gas recognition network adopted is superior to the fine-tuned ResNet50, Alex-Net, and ResNet34 networks in both accuracy and sample processing times. Finally, the highest recognition accuracy of the classification results of our proposed route is 99.9%, which is better than other similar work.

Automated summary

In recent years, the application of Deep Neural Networks has been developing in gas recognition. To improve the classification performance, various filtering methods are used to smooth filter the gas sensing response data and remove redundant information. The optimized Savitzky-Golay filtering algorithm is applied, and the gas sensing response data is encoded into two-dimensional sensing images using the Gramian Angular Summation Field (GASF) method. Data augmentation technology is used to enhance the classifier's robustness and generalization ability. With fine-tuning of the GoogLeNet neural network, the classification of four gases is achieved with high accuracy. The proposed method outperforms other networks like ResNet50, Alex-Net, and ResNet34 in terms of accuracy and sample processing times.