Technique for wireless reading of passive microfluidic sensors. Issue 3 (1st February 2018)

• Record Type: Journal Article
• Authors: Henry, D.; Aubert, H.; Pons, P.; Lorenzo, J.; Lázaro, A.; Girbau, D.
• Is Part Of: Electronics letters. Volume 54:Issue 3(2018)
• Page Start: 150
• Page End: 151
• Publication Date: 2018-02-01
• Subjects: microfluidics -- microsensors -- temperature sensors -- FM radar -- CW radar; wireless reading -- passive microfluidic sensors -- high‐resolution microfluidic sensors -- remote reading -- temperature sensors -- remote interrogation -- frequency‐modulated continuous‐wave radar -- mechanical beam scanning -- sensor location -- electromagnetic echo level -- temperature fluctuation -- radar measurement data -- meniscus position -- sensor microchannel -- frequency 24 GHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2017.2201
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : The remote reading of high‐resolution microfluidic and passive (i.e. batteryless and chipless) temperature sensors is focused. These sensors are remotely interrogated from a 24 GHz frequency‐modulated continuous‐wave radar performing a mechanical beam scanning for locating the sensors and measuring the variation of sensors electromagnetic echo level due to temperature fluctuation. From radar measurement data, an estimator is proposed here for determining the meniscus position of the fluid inside the sensors microchannel and for deriving the temperature at the sensors location. It is shown that the estimator presents a convenient linear dependence with the meniscus position at the sensor location. The smallest measurable variation of the meniscus position is of 40 µm.