Higher-order sensing using QCM sensor array and preconcentrator with variable temperature

Proposed the higher-order sensing method using preconcentrator with variable temperature in combination with the QCM sensor array to extract features of the samples. The rough separation among the compounds along the time axis enhanced the discrimination capability of the sensor array system. The results of the second-order sensing such as the images of the sensor responses and the loci on PCA space gave a lot of information on the samples. Moreover, the low-concentration flavors in water were discriminated using the proposed method. It was found that the system had robustness to humidity as well as enhanced discrimination capability.