Table 2.
Methods for background interference suppression
| Ref No. | Author (year) | Gas Sensors/e-Nose System | Sampling Type | Gases to Be Detected | Interference Source | Data Processing Method | Effects |
|---|---|---|---|---|---|---|---|
| [30] | J. Feng, et al. (2011) | TGS826, TGS813, TGS825, TGS800, TGS816, TGS2620, TGS822, TGS2602, TGS2600, QS01, WSP2111, MQ138, MQ135, SP3S-AQ2 and AQ sensor | Pump suction | Wound detection (P. aeruginosa, E. coli and S. aureus) | The smell of mice themselves | Wavelet transform, RBF | Recognition rate: RBF with ‘Leave-one-out’ method: 95%; RBF with ‘40 Training + 40 Test’ method: 97.5%. |
| [31] | F. Tian, et al. (2012) | TGS826, TGS813, TGS825, TGS800, TGS816, TGS2620, TGS822, TGS2602, TGS2600, QS01, WSP2111, MQ138, MQ135, SP3S-AQ2 and AQ sensor | Pump suction | Wound detection (P. aeruginosa, E. coli and S. aureus) | The smell of mice themselves | ICA, RBF | Recognition rate: 96.25%. |
| [35] | J. Feng, et al. (2014) | TGS826, TGS813, TGS825, TGS800, TGS816, TGS2620, TGS822, TGS2602, TGS2600, QS01, WSP2111, MQ138, MQ135, SP3S-AQ2 and AQ sensor. | Pump suction | Wound detection (P. aeruginosa, E. coli and S. aureus) | The smell of mice themselves | OSC, RBF, PSO | Recognition rate: 97.5%. |
| [36] | F. Tian, et al. (2012) | TGS2602, TGS2620, TGS2201 | Diffusion sampling | Formaldehyde and benzene | Noise interference | PCA, ICA, RBF | Average relative prediction error: formaldehyde: 30.4%; benzene: 10.726%. |
| [37] | R. Gutierrez-Osuna, et al. (2004) | TGS2602, TGS2610, TGS2611, TGS2620 | Pump suction | Acetone, isopropyl alcohol and ammonia | Background chemicals | Generalization Fisher’s linear discriminants | Cancel the effect of both single and mixture backgrounds |
| [38] | R. Gutierrez-Osuna, et al. (2003) | TGS2602, TGS2610, TGS2611, TGS2620 | Pump suction | Acetone, isopropyl alcohol and ammonia | Background odors | Linear discriminant function, KIII model | Eliminate the memory effect of previously detected |
| [39] | A. Gutierrez-Galvez, et al. (2006) | TGS2602, TGS2610, TGS2611, TGS2620 | Pump suction | Acetone, isopropyl alcohol and ammonia | Background odors | KIII model | Anti-Hebbian term can reduce the overlap between patterns |