Continuous wide spectrum odor sensing for electronic nose system

Abstract

Purpose

This paper aims to propose an odor sensing system based on wide spectrum for e-nose, based on comprehensive analysis on the merits and drawbacks of current e-nose.

Design/methodology/approach

The wide spectral light is used as the sensing medium in the e-nose system based on continuous wide spectrum (CWS) odor sensing, and the sensing response of each sensing element is the change of light intensity distribution.

Findings

Experimental results not only verify the feasibility and effectiveness of the proposed system but also show the effectiveness of least square support vector machine (LSSVM) in eliminating system errors.

Practical implications

Theoretical model of the system was constructed, and experimental tests were carried out by using NO₂ and SO₂. System errors in the test data were eliminated using the LSSVM, and the preprocessed data were classified by euclidean distance to centroids (EDC), k-nearest neighbor (KNN), support vector machine (SVM), LSSVM, respectively.

Originality/value

The system not only has the advantages of current e-nose but also realizes expansion of sensing array by means of light source and the spectrometer with their wide spectrum, high resolution characteristics which improve the detection accuracy and realize real-time detection.

Citation

Zhang, W., Tian, F., Song, A., Zhao, Z., Hu, Y. and Jiang, A. (2018), "Continuous wide spectrum odor sensing for electronic nose system", Sensor Review, Vol. 38 No. 2, pp. 223-230. https://doi.org/10.1108/SR-04-2017-0067