Wireless Measurement Electronics for Passive Temperature Sensor

Sardini, Emilio; Serpelloni, Mauro

doi:10.1109/tim.2012.2199189

Cited by 36 publications

(14 citation statements)

References 20 publications

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“…Similar techniques, when combined with other sensing mechanisms, such as responses of ligand/receptor binding pairs, dielectric changes in humidity or pH sensitive polymers, and alignment changes within liquid crystals can yield highly specific, stable, and repeatable, multimodal detection. External sensor readout systems can be adapted to wearable or portable configurations, enabling compact and fully functional systems for health and wellness monitoring.…”

Section: Introductionmentioning

confidence: 99%

Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain

Huang

Wang

Cheng³

et al. 2014

Adv Funct Materials

270

197

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This paper presents materials and designs for an ultrathin, stretchable class of device that is capable of lamination onto the surface of the skin, for wireless determination of dielectric and surface strain properties. The sensor exploits LC resonators with capacitive electrodes whose radio frequency characteristics change with variations in skin properties, and is capable of conformal and spontaneous integration with skin due to their skin‐like, “epidermal”, mechanical properties. Resonance frequencies of the LC resonators can be measured wirelessly through changes in the absorption of electromagnetic energy from a coil connected to an impedance measurement setup and placed in proximity to the epidermal device. Experimental results demonstrate that the device offers a precision of 1.1 (arbitrary unit of a reference commercial hydration meter) for hydration and 1.3% for strain detection, with good stability and low drift. Measurement of simulated lymphedema using an expandable balloon with an attached sensor further demonstrates the potential for using such a sensor in monitoring skin swelling. Finite element simulation of physical deformation and associated changes in electrical properties enable quantitative interpretation of the experimental results. The results may have relevance for wireless evaluation of the skin, for applications ranging from dermatology and cosmetology to health/wellness monitoring (lymphedema, transdermal water loss, edema, and psychological stress).

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Section: Introductionmentioning

confidence: 99%

Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain

Huang

Wang

Cheng³

et al. 2014

Adv Funct Materials

270

197

View full text Add to dashboard Cite

show abstract

“…Even though these wireless sensors can reach long distances, they can only take measurements intermittently due to the imbalance between the power consumption of the sensor node and the limited capacity of the on-board battery. Passive wireless sensors, such as those based on inductive coupling [5]- [7] and surface acoustic waves (SAWs) [8], [9] can operate without a local power source. Wireless sensors based on inductive coupling usually consist of an inductor-capacitor (LC) resonant circuit.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Patch Antenna Temperature Sensor

2015

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The resonant frequencies of a microstrip patch antenna are dependent on the dielectric constant of its substrate and the physical dimensions of its radiation patch. Both of these parameters are temperature-dependent. In this paper, we investigated the effects of temperature on the antenna resonant frequencies for the purpose of studying the microstrip patch antenna as a temperature sensor. First, the relationship between the antenna resonant frequency shift and the temperature change is derived based on the transmission line model. To validate the theoretical prediction, antenna sensors bonded on different metal bases were tested in a temperature chamber. By comparing the measured temperature-frequency relationship with the theoretical predictions, we discovered that the dielectric constant of the substrate is not only dependent on temperature but also influenced by the base material. After calibrating the thermal coefficient of the substrate dielectric constant using the measurement data, the differences between the measurements and the theoretical predictions were within the expected systematic error of the reference thermocouple, validating that a microstrip patch antenna can serve as a temperature sensor.

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“…Most researches about the LC-type passive wireless sensors focused on the design of sensing elements for all kinds of applications and then a so-called phase-dip technique was often applied to wirelessly determine the resonant frequency of the sensor tank using a commercial impedance/network analyzer [10]. In order to avoid the need of expensive, bulky commercial instruments in practical applications, a portable custom-made reader is required [11]. Additionally, the phase-dip frequency is related to the inductive coupling coefficient, thus requiring some additional compensation methods [12].…”

Section: Introductionmentioning

confidence: 99%

An <italic>LC</italic>-Type Passive Wireless Humidity Sensor System With Portable Telemetry Unit

Zhang

Wang

Huang

et al. 2015

J. Microelectromech. Syst.

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This paper presents a high-sensitivity passive wireless humidity sensor system with a portable telemetry unit for applications in sealed environments. A complementary metal oxide semiconductor (CMOS) interdigital capacitive humidity sensor die was attached to an organic substrate (FR-4) on which a fixed planar spiral copper inductor was fabricated. The variable capacitor and the fixed inductor were wire bonded to form an inductor-capacitor (LC) tank circuit. The resonant frequency of the sensor tank is dependent on the sensor capacitance, which changes in response to the humidity. The sensitivity of the capacitive sensor was improved significantly using graphene oxide as a sensing material. The package-level integration was achieved by employing the embedded inductor on an organic packaging substrate. The LC-type sensor is interrogated wirelessly using our homemade portable telemetry unit, which is based on a standing wave ratio bridge to measure the real part of the readout coil impedance. Measurements show a sensitivity of −18.75 kHz/%RH over a range of 15%-95% RH. The implemented telemetry unit addresses the need for a low-cost, portable, and universal reader of the LC-type passive wireless sensors.[ 2013-0188]Index Terms-Humidity sensor, LC resonant sensor, passive sensor, wireless sensor, telemetry.

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Wireless Measurement Electronics for Passive Temperature Sensor

Cited by 36 publications

References 20 publications

Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain

Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain

Microstrip Patch Antenna Temperature Sensor

An <italic>LC</italic>-Type Passive Wireless Humidity Sensor System With Portable Telemetry Unit

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