A Feasibility Study of Tissue Characterization Using LC Sensors

Yvanoff, M.; Venkataraman, Jayanti

doi:10.1109/tap.2009.2016073

Cited by 34 publications

(29 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous work by this research group has shown that a shift in resonant frequency relative to free space can be used to accurately characterize tissue [7]. A similar technique can be used to characterize blood glucose levels.…”

Section: Effect Of Blood Glucose Levels On the Antenna Resonant Frequmentioning

confidence: 99%

See 1 more Smart Citation

Feasibility study for non-invasive blood glucose monitoring

Freer

Venkataraman

2010

2010 IEEE Antennas and Propagation Society International Symposium

Self Cite

View full text Add to dashboard Cite

The present work investigates the feasibility of a non invasive blood glucose monitoring system using an antenna placed in a cuff and wrapped around the wrist. The technique is based on the fact that glucose levels affect the dielectric properties of blood. Using a realistic tissue model of a human hand, simulations have been performed with HFSS to obtain the antenna input impedance. The resonant frequency is seen to shift with changes in blood glucose levels. Based on our previous work of tissue characterization, an analytical technique can be developed to relate this frequency shift to the permittivity and conductivity of blood, from which the glucose levels are determined.

show abstract

Section: Effect Of Blood Glucose Levels On the Antenna Resonant Frequmentioning

confidence: 99%

“…Changes in blood glucose levels affect the dielectric properties of blood, causing a shift in the resonant frequency of an external antenna. Based on our previous work [7], this shift in frequency can be used to characterize blood permittivity and conductivity, and ultimately the blood glucose levels.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study for non-invasive blood glucose monitoring

Freer

Venkataraman

2010

2010 IEEE Antennas and Propagation Society International Symposium

Self Cite

View full text Add to dashboard Cite

show abstract

“…For decades, a resonant circuit consisting of an inductor and a capacitor has been widely used in many industrial and biomedical applications: temperature measurement [34], chemical sensing [35], pressure monitoring [34,36,37], water content monitoring in construction materials [38], permittivity sensing in human tissues [34,39], humidity sensing [34,40], pH measurement [41], and strain sensing in structures [42]. In these applications, small change in the physical properties of interest causes deviation in the resonance frequency or impedance change within the resonant circuit.…”

Section: Motivationmentioning

confidence: 99%

Low Voltage Electrostatic Actuation and Displacement Measurement Through Resonant Drive Circuit

Park

Abdel‐Rahman

2012

Volume 5: 6th International Conference on Micro- And Nanosystems; 17th Design for Manufacturing and the Life Cycle Conference

View full text Add to dashboard Cite

Most electrostatic actuators fabricated by MEMS technology require high actuation voltage and suffer from the pull-in phenomenon that limits the operation range. We present an amplitude-modulated resonant drive circuit to drive electrostatic actuators at much lower supply voltage than that of conventional actuators to extend their operation range. Analytical and numerical models facilitate stability analysis of electrostatic actuators coupled with the resonant drive circuit. We study the impact of parasitic capacitance and the quality factor of the resonant drive circuit on the operation range of electrostatic actuators. Furthermore, we present a new method to measure the displacement of electrostatic actuators by sensing the phase delay of the actuation voltage with respect to the input voltage. This measurement method allows us to easily incorporate feedback control into existing electrostatic actuators without any modification to the actuator itself.

show abstract

“…For instance, in electrical/electronic engineering area it can be used to determine unambiguously the rate between the real ͑power consuming͒ and the reactive ͑power storing͒ parts of the input and/or output impedance of a given circuit. [5][6][7][8][9] In these systems, using an appropriated transducer, the resonance frequency f 0 of the probe is modified according to a given physiological information. 4 As a specific example, the biotelemetry systems based on passive resonant remote probes can be cited.…”

Section: Introductionmentioning

confidence: 99%

“…For practical purposes, this information ͑about phase difference͒ can be used to correct the circuit power factor, 1,2 to transmit data ͑phase modulation͒, 3 or to implement general measurement procedures. [5][6][7][8][9] This resonance frequency can be evaluated by measuring the input system voltage amplitude for the different excitation signal frequencies: maximum amplitude corresponding to the situation which the excitation signal frequencies matches f 0 . [5][6][7][8][9] In these systems, using an appropriated transducer, the resonance frequency f 0 of the probe is modified according to a given physiological information.…”

Section: Introductionmentioning

confidence: 99%

A simple method to measure phase difference between sinusoidal signals

Bertotti

Hara

Abatti

2010

Review of Scientific Instruments

View full text Add to dashboard Cite

In this paper, a novel and simple method to measure the phase difference between two sinusoidal signals is presented. Basically, the method consists of subtracting two sinusoidal signals with same frequencies and measuring the resulting signal amplitude: this amplitude being a minimum whenever there is a coincidence between both signal phases. In order to test this method, an adjustable phase reference signal has been generated using a direct digital synthesizer device. Employing this reference signal, it can be demonstrated that the phase difference between two signals can be evaluated with errors smaller than 0.3° for signals with frequencies up to 1.25 MHz.

show abstract

A Feasibility Study of Tissue Characterization Using LC Sensors

Cited by 34 publications

References 15 publications

Feasibility study for non-invasive blood glucose monitoring

Feasibility study for non-invasive blood glucose monitoring

Low Voltage Electrostatic Actuation and Displacement Measurement Through Resonant Drive Circuit

A simple method to measure phase difference between sinusoidal signals

Contact Info

Product

Resources

About