Body-worn fully-passive wireless analog sensors for physiological signal capture through load modulation using resistive transducers

Consul-Pacareu, Sergi; Arellano, David; Morshed, Bashir I.

doi:10.1109/hic.2014.7038876

Cited by 11 publications

(13 citation statements)

References 10 publications

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“…However, for body-worn sensors, inductive loading is a more appropriate solution due to non-ionizing radiation and proximity of the portable scanner to body-worn sensors [36]. For the simple WRAP sensor system [37,38], the effective impedance from the scanner side correlates to load resistance (RL) of a RLC parallel circuit, and is given by:…”

Section: B Wrap Sensor Operation Theorymentioning

confidence: 99%

“…For instance, R L can be simply transducer resistance [37], or the resistance across a transistor [38,39] used to probe bioelectric or impedimetric signals. The carrier signal amplitude is modulated due to change of R L , and the modulated signals at the scanner correlate to the changes of R L .…”

Section: B Wrap Sensor Operation Theorymentioning

confidence: 99%

“…The carrier signal amplitude is modulated due to change of R L , and the modulated signals at the scanner correlate to the changes of R L . We have previously describes WRAP sensors based on this technique for physiological signal collection and bio-potential signal capture [37][38][39].…”

Section: B Wrap Sensor Operation Theorymentioning

confidence: 99%

“…This paper focuses on the development and application of a system for collecting physiological data using this novel type of low-cost disposable IJP electronic WRAP sensor. While prototyping of the sensors for measuring ECG, heart rate, respiration rate, and temperature is underway or have been reported elsewhere [37][38][39], this paper focuses on the development of our recent complete system framework development efforts for SCC with an illustrative example of the WRAP temperature sensor. This new technology aims to empower community members to self-monitor personal health, and to generate temporal and spatial knowledge that might improve the overall SCC health condition.…”

Section: Introductionmentioning

confidence: 99%

“…A major drawback of capacitive sensing is that the sensed signal is limited to voltage only. In contrast, we have developed fully-passive wireless sensors based on a resistive approach, "Wireless Resistive Analog Passiv" (WRAP) sensors, that can sense bioelectric potential (voltage signal) as well as other physical stimuli (e.g., pressure, temperature, light) [37][38][39]. The advantages of WRAP sensors are low cost, high sampling rate, low power, and the possibility of prototyping on flexible substrates using inkjet printing (IJP) technique as discussed below.…”

Section: Introductionmentioning

confidence: 99%

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Inkjet Printed Fully-Passive Body-Worn Wireless Sensors for Smart and Connected Community (SCC)

Morshed

Harmon

Zaman

et al. 2017

JLPEA

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Future Smart and Connected Communities (SCC) will utilize distributed sensors and embedded computing to seamlessly generate meaningful data that can assist individuals, communities, and society with interlocking physical, social, behavioral, economic, and infrastructural interaction. SCC will require newer technologies for seamless and unobtrusive sensing and computation in natural settings. This work presents a new technology for health monitoring with low-cost body-worn disposable fully passive electronic sensors, along with a scanner, smartphone app, and web-server for a complete smart sensor system framework. The novel wireless resistive analog passive (WRAP) sensors are printed using an inkjet printing (IJP) technique on paper with silver inks (Novacentrix Ag B40, sheet resistance of 21 mΩ/sq) and incorporate a few discrete surface mounted electronic components (overall thickness of <1 mm). These zero-power flexible sensors are powered through a wireless inductive link from a low-power scanner (500 mW during scanning burst of 100 ms) by amplitude modulation at the carrier signal of 13.56 MHz. While development of various WRAP sensors is ongoing, this paper describes development of a WRAP temperature sensor in detail as an illustration. The prototypes were functionally verified at various temperatures with energy consumption of as low as 50 mJ per scan. The data is analyzed with a smartphone app that computes severity (Events-of-Interest, or EoI) using a real-time algorithm. The severity can then be anonymously shared with a custom web-server, and visualized either in temporal or spatial domains. This research aims to reduce ER visits of patients by enabling self-monitoring, thereby improving community health for SSC.

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Section: B Wrap Sensor Operation Theorymentioning

confidence: 99%

Section: B Wrap Sensor Operation Theorymentioning

confidence: 99%

Section: B Wrap Sensor Operation Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Inkjet Printed Fully-Passive Body-Worn Wireless Sensors for Smart and Connected Community (SCC)

Morshed

Harmon

Zaman

et al. 2017

JLPEA

View full text Add to dashboard Cite

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A low-power portable scanner for body-worn Wireless Resistive Analog Passive (WRAP) sensors for mHealth applications

Zaman

Morshed

2021

Measurement

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Design and analysis of a novel wireless resistive analog passive sensor technique

Consul-Pacareu

Morshed

2018

IET wirel. sens. syst.

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Unobtrusive monitoring of physiological signals in natural settings is important for precision diagnostics. Fully‐passive wireless body‐worn sensors are viable and promising for unobtrusive monitoring. In this study, the authors present a new class of fully‐passive sensor, namely wireless resistive analog passive (WRAP) sensor. It uses resistive transducers at the sensors for converting physical stimulus to load modulation of carrier wireless signal at 13.56 MHz at low power (–20 to 0 dBm). The sensor is simply composed of a loop antenna, a tuning capacitor, and a resistive transducer suitable for the type of physiological signals to be measured. The authors report the characterisation of WRAP sensors for various resistive loads of 1.2 ω to 82 kω at various co‐axial distances (5–40 mm) between the TX and RX antennas. They have prototyped and characterised multiple WRAP sensors with several practical measurements of physiological signals such as heart rate, temperature, and pulse oximetry. They also demonstrate bio‐potential measurement (down to 400 μVpp) using metal–oxide–semiconductor field‐effect transistor as the transducer. These results show the feasibility of developing a new type of body‐worn fully‐passive WRAP sensors for unobtrusive physiological signal monitoring at real‐life settings for precision diagnostics of many disorders and tracking person‐centric therapy efficacy.

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Body-worn fully-passive wireless analog sensors for physiological signal capture through load modulation using resistive transducers

Cited by 11 publications

References 10 publications

Inkjet Printed Fully-Passive Body-Worn Wireless Sensors for Smart and Connected Community (SCC)

Inkjet Printed Fully-Passive Body-Worn Wireless Sensors for Smart and Connected Community (SCC)

A low-power portable scanner for body-worn Wireless Resistive Analog Passive (WRAP) sensors for mHealth applications

Design and analysis of a novel wireless resistive analog passive sensor technique

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