Journal ArticleDOI
Wireless Readout of Passive LC Sensors
Reads0
Chats0
TLDR
It is shown that, due to fundamental system limitations, the formerly reported circuit concepts are not applicable if the distance between the sensor and the readout electronic circuit becomes too small, resulting in large coupling coefficients.Abstract:
This paper reports simple yet precise equations for automated wireless measurement of the resonance frequency, Q-factor, and coupling coefficient of inductively coupled passive resonant LC circuits. This allows remote sensing of all physical and chemical quantities that can be measured with capacitance transducers. Formerly reported front-end circuit concepts for wireless sensor readout, i.e., phase dip measurement and the dip meter, are subsequently discussed. It is shown that, due to fundamental system limitations, the formerly reported circuit concepts are not applicable if the distance between the sensor and the readout electronic circuit becomes too small, resulting in large coupling coefficients. Therefore, we present an improved concept for an analog front-end circuit of the readout system that overcomes these limitations and hence allows wireless sensor readout under a wider range of operating distances.read more
Citations
More filters
Journal ArticleDOI
Continuous wireless pressure monitoring and mapping with ultra-small passive sensors for health monitoring and critical care
Lisa Y. Chen,Benjamin C. K. Tee,Alex Chortos,Gregor Schwartz,Victor Tse,Victor Tse,Darren J. Lipomi,H.-S. Philip Wong,Michael V. McConnell,Zhenan Bao +9 more
TL;DR: A wireless, real-time pressure monitoring system with passive, flexible, millimetre-scale sensors, scaled down to unprecedented dimensions of 1 × 1 × 0.1 cubic millimeters is reported, which has broader applications in continuous wireless monitoring of multiple physiological parameters for biomedical research and patient care.
Journal ArticleDOI
Materials and Designs for Wireless Epidermal Sensors of Hydration and Strain
Xian Huang,Yuhao Liu,Huanyu Cheng,Woo Jung Shin,Jonathan A. Fan,Zhuangjian Liu,Ching Jui Lu,Gil Woo Kong,Kaile Chen,Dwipayan Patnaik,Sang Heon Lee,Sami Hage-Ali,Yonggang Huang,John A. Rogers +13 more
TL;DR: In this paper, an ultrathin, stretchable class of device that is capable of laminating onto the surface of the skin, for wireless determination of dielectric and surface strain properties is presented.
Journal ArticleDOI
Stretchable, Wireless Sensors and Functional Substrates for Epidermal Characterization of Sweat
Xian Huang,Yuhao Liu,Kaile Chen,Woo Jung Shin,Ching Jui Lu,Gil Woo Kong,Dwipayan Patnaik,Sang Heon Lee,Jonathan Fajardo Cortes,John A. Rogers +9 more
TL;DR: Materials and architectures for ultrathin, stretchable wireless sensors that mount on functional elastomeric substrates for epidermal analysis of biofluids and colorimetric responses to pH and concentrations of various ions provide capabilities relevant to analysis of sweat are introduced.
Journal ArticleDOI
LC Passive Wireless Sensors Toward a Wireless Sensing Platform: Status, Prospects, and Challenges
TL;DR: An overview of the status and challenges in the LC passive wireless sensor toward a wireless sensing platform is provided and recent efforts to increase the interrogation distance and to extend the measurement of single parameter to multiple parameters are finally outlined.
Journal ArticleDOI
Generalized parity–time symmetry condition for enhanced sensor telemetry
Pai-Yen Chen,Maryam Sakhdari,Mehdi Hajizadegan,Qingsong Cui,Mark Ming-Cheng Cheng,Ramy El-Ganainy,Andrea Alù,Andrea Alù +7 more
TL;DR: The concept of isospectral party–time–reciprocal scaling (PTX) symmetry is introduced and it is shown that it can be used to build a new family of radiofrequency wireless microsensors exhibiting ultrasensitive responses and ultrahigh resolution, which are well beyond the limitations of conventional passive sensors.
References
More filters
Journal ArticleDOI
A precise four-quadrant multiplier with subnanosecond response
TL;DR: Among the most signficant presentations in the 50-year history of the ISSCC, Barrie Gilbert's classic paper has become the fifth most frequently cited JSSC article and the first to be cited over 100 times.
Geometric Approach for Coupling Enhance t of Magnetically Coupled Coils
M. Zierhofer,E. S. Hochmair +1 more
TL;DR: In this paper, a geometric approach for the enhancement of the coupling coefficient between two magnetically coupled coils is presented, where the turns of the coils are not concentrated at the Circumferences, but distributed across the diameters.
Journal ArticleDOI
Geometric approach for coupling enhancement of magnetically coupled coils
TL;DR: It is demonstrated that the coupling coefficient can be considerably enhanced, if the turns of the coils are not concentrated at the circumferences, but distributed across the diameters.
Journal ArticleDOI
Wireless micromachined ceramic pressure sensor for high-temperature applications
TL;DR: In this paper, a completely passive ceramic pressure sensor that uses a wireless telemetry scheme has been developed, which removes the need for electronics, power supplies, or contacts to withstand the high-temperature environment.
Journal ArticleDOI
Miniature Passive Pressure Transensor for Implanting in the Eye
TL;DR: Passive operation provides extended life, but limits useful range to less than 10 transducer diameters, which has proved sufficient for intraocular pressure measurement.