Reducing power consumption via a discontinuous operation of temperature-modulated micro-hotplate gas sensors: Application to the logistics chain of fruit

Sensor Array Design for Complex Sensing Tasks

“…Such systems could leverage the chemometric second-order advantage (38) which could allow for analysis of target compounds in the presence of uncalibrated interferant backgrounds. They also open the potential to build sensor systems that can adapt to changing environments and sensing tasks, gaining efficiency by limiting the number of measurements made to only those that are necessary (66). For example, microhotplate sensors precisely control the temperature of a metal oxide sensor surface, thus altering the sensor response characteristics in a repeatable, programmable fashion (67,68).…”

Drop-coated sensing layers on ultra low power hotplates for an RFID flexible tag microlab

“…The four different coatings consisted of WO 3 + 1% wt Pt, SnO 2 + 1% wt Pt, SnO 2 + 1% wt Pd and SnO 2 + 1% wt Au. The choice of these materials for this particular application was based on previous studies [2,4]. The precursor solutions of the three noble metals employed as catalysts were tetra-ammine-platinum(II) nitrate, tetra-amminepalladium(II) nitrate and Gold(III) oxide, respectively.…”

“…Metal oxide gas sensors show enough sensitivity and a fair stability for the fruit application considered here, since only an alarm monitor for detecting abnormal concentrations of the gases of interest is needed. In previous works, the optimisation of metal oxide sensor arrays employing doped tin and tungsten oxides in the framework of the application sought has been reported [2,4]. However, these sensors were initially developed to be onboard of the reader and, therefore, their power consumption was too high to meet the stringent power specifications that apply within the battery-operated FTMs.…”

Detecting Chemical Hazards with Temperature-Programmed Microsensors: Overcoming Complex Analytical Problems with Multidimensional Databases

“…other researchers have studied temperature modulation applied at a relatively low frequency to a single (commercial) sensor. They report a somewhat expanded information stream that permits identification of a larger range of analytes with such a device (24,25,26). The approach reviewed herein relies on low-power, temperature-pulsed microdevices and utilizes rapid (∼100-ms duty cycle) temperature programming to collect data of high temporal information density to characterize complex gas-phase streams.…”