Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/141577
Title: Fast measurements with MOX sensors: A least-squares approach to blind deconvolution
Author: Martínez, Dominique
Burgués, Javier
Marco Colás, Santiago
Keywords: Metall-òxid-semiconductors
Detectors de gasos
Metal oxide semiconductors
Gas detectors
Issue Date: 18-Sep-2019
Publisher: MDPI
Abstract: Metal oxide (MOX) sensors are widely used for chemical sensing due to their low cost, miniaturization, low power consumption and durability. Yet, getting instantaneous measurements of fluctuating gas concentration in turbulent plumes is not possible due to their slow response time. In this paper, we show that the slow response of MOX sensors can be compensated by deconvolution, provided that an invertible, parametrized, sensor model is available. We consider a nonlinear, first-order dynamic model that is mathematically tractable for MOX identification and deconvolution. By transforming the sensor signal in the log-domain, the system becomes linear in the parameters and these can be estimated by the least-squares techniques. Moreover, we use the MOX diversity in a sensor array to avoid training with a supervised signal. The information provided by two (or more) sensors, exposed to the same flow but responding with different dynamics, is exploited to recover the ground truth signal (gas input). This approach is known as blind deconvolution. We demonstrate its efficiency on MOX sensors recorded in turbulent plumes. The reconstructed signal is similar to the one obtained with a fast photo-ionization detector (PID). The technique is thus relevant to track a fast-changing gas concentration with MOX sensors, resulting in a compensated response time comparable to that of a PID.
Note: Reproducció del document publicat a: https://doi.org/10.3390/s19184029
It is part of: Sensors, 2019, vol. 19, num. 18, p. 4029-4044
URI: http://hdl.handle.net/2445/141577
Related resource: https://doi.org/10.3390/s19184029
ISSN: 1424-8220
Appears in Collections:Articles publicats en revistes (Electrònica)

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