A Novel Method to Read Remotely Resonant Passive Sensors in Biotelemetric Systems

Pichorim, Sérgio Francisco; Abatti, Paulo José

doi:10.1109/jsen.2007.912386

Cited by 32 publications

(17 citation statements)

References 9 publications

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“…As described previously, besides improvements from using the developed dataprocessing-based readout method from a software perspective, low-noise circuitry and techniques from a hardware perspective should be included to electronically reduce the measurement noise and enhance the SNR in phase-dip frequency detection [31]. Other readout methods have also been explored in different research groups [40]- [42] with the aim of long-range telemetric sensing and are valuable for comparison to the configuration proposed in this work. Moreover, in cases where either the sensor-reader coil coupling or quality factor of the sensor is substantial enough to influence the frequency shift resolution based on (10), some compensation method would be required as part of the final telemetric system.…”

Section: B In Vivo Testmentioning

confidence: 99%

Wireless Intraocular Pressure Sensing Using Microfabricated Minimally Invasive Flexible-Coiled LC Sensor Implant

Chen

Saati

Varma

et al. 2010

J. Microelectromech. Syst.

241

130

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Abstract-This paper presents an implant-based wireless pressure sensing paradigm for long-range continuous intraocular pressure (IOP) monitoring of glaucoma patients. An implantable parylene-based pressure sensor has been developed, featuring an electrical LC-tank resonant circuit for passive wireless sensing without power consumption on the implanted site. The sensor is microfabricated with the use of parylene C (poly-chlorop-xylylene) to create a flexible coil substrate that can be folded for smaller physical form factor so as to achieve minimally invasive implantation, while stretched back without damage for enhanced inductive sensor-reader coil coupling so as to achieve strong sensing signal. A data-processed external readout method has also been developed to support pressure measurements. By incorporating the LC sensor and the readout method, wireless pressure sensing with 1-mmHg resolution in longer than 2-cm distance is successfully demonstrated. Other than extensive on-bench characterization, device testing through six-month chronic in vivo and acute ex vivo animal studies has verified the feasibility and efficacy of the sensor implant in the surgical aspect, including robust fixation and long-term biocompatibility in the intraocular environment. With meeting specifications of practical wireless pressure sensing and further reader development, this sensing methodology is promising for continuous, convenient, direct, and faithful IOP monitoring.[ 2009-0111]Index Terms-Implantable microdevice, intraocular pressure (IOP), LC pressure sensor, parylene, wireless sensing.

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Section: B In Vivo Testmentioning

confidence: 99%

Wireless Intraocular Pressure Sensing Using Microfabricated Minimally Invasive Flexible-Coiled LC Sensor Implant

Chen

Saati

Varma

et al. 2010

J. Microelectromech. Syst.

241

130

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show abstract

“…An inductively coupled passive telemetric system including the effects of parasitic capacitances and leakage fluxes is proposed in [10]. A wireless approach to measure the RLC passive sensors resonance frequency and Q factor is reported in [19] where the developed method is based on simultaneous application of three excitation signals of constant amplitude with different frequencies. All of these focused on the concept based on passive inductive coupling and sensing the change in the capacitance of LC closed loop resonance circuit.…”

Section: Introductionmentioning

confidence: 99%

Wireless Measurement System for Extracting Open Loop Micro Coil Parameters

2011

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We report here the wireless extraction of an open ended micro coil inductance L, parasitic capacitance C and resistance R using an inductively coupled passive system which consists of an electrically small magnetic loop antenna as a sensor coil and an open ended test micro coil. Wireless analytical model is developed which includes the gimmick effects generated due to parasitic coupling capacitances. The micro coil parameters i.e. inductance, inter winding capacitance and resistance are extracted from the wirelessly measured impedance signal and then compared with the analytical model. Further the inductively coupled system is simulated using COMSOL multiphyscics in ACDC module.

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“…This demanded the need to develop new measurement methods for characterizing the micro coils wirelessly. Previously passive wireless read out using inductive coupling for measuring different physical quantities have been reported frequently [1][2][3][4][5][6]. All of these publications focused on the concept based on inductive coupling and sensing the change in the capacitance of LC closed loop resonance circuit.…”

Section: Introductionmentioning

confidence: 99%

Wireless measurement of open loop micro coils

Yousaf

Jaeger

Reindl

et al. 2011

2011 IEEE International Instrumentation and Measurement Technology Conference

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This paper reports for the first time wireless measurement of open loop micro coils inductance, inter winding capacitance and parasitic resistance. Wireless read out is performed using an inductively coupled passive system which consists of an electrically small magnetic loop antenna as a sensing coil and an open loop test micro coil. Further an equivalent circuit model is established which includes the parasitic capacitive coupling effects of the measurement setup. The actual parameters i.e. inductance, inter winding capacitance and resistance of open micro coils are extracted from the wirelessly measured signal and compared with the modeled results.

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A Novel Method to Read Remotely Resonant Passive Sensors in Biotelemetric Systems

Cited by 32 publications

References 9 publications

Wireless Intraocular Pressure Sensing Using Microfabricated Minimally Invasive Flexible-Coiled LC Sensor Implant

Wireless Intraocular Pressure Sensing Using Microfabricated Minimally Invasive Flexible-Coiled LC Sensor Implant

Wireless Measurement System for Extracting Open Loop Micro Coil Parameters

Wireless measurement of open loop micro coils

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