A Flexible Wireless Dielectric Sensor for Noninvasive Fluid Monitoring

Zhu, Hengtian; Ye, Chen; Xiong, Yifeng; Xu, Fei; Lu, Yanqing

doi:10.3390/s20010174

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…Therefore, most of the published works focus on the application of the tubular configuration, while there are few on the radial configuration. Recently, the potential of applying C 4 D to non-electrophoretic fields has been mined and the pipe scale has been extended beyond the original capillary or microchannel (the inner diameter of the pipe is larger than 1 mm) [ 1 , 5 , 9 , 11 , 12 , 13 ]. To realize satisfactory measurement performance, both the ratio of the tubular electrode length to the pipe diameter and the ratio of the tubular electrodes distance to the pipe diameter are usually large enough (larger than 5 or even 10) [ 2 , 3 , 4 , 9 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Electrode Geometry on the Performance of C4D Sensor with Radial Configuration

Huang

Jiang

et al. 2021

Sensors

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Electrodes are basic components of C4D (capacitively coupled contactless conductivity detection) sensors, and different electrode structures (the configuration pattern or the electrode geometry) can lead to different measurement results. In this work, the effects of electrode geometry of radial configuration on the measurement performance of C4D sensors are investigated. Two geometrical parameters, the electrode length and the electrode angle, are considered. A FEM (finite element method) model based on the C4D method is developed. With the FEM model, corresponding simulation results of conductivity measurement with different electrode geometry are obtained. Meanwhile, practical experiments of conductivity measurement are also conducted. According to the simulation results and experimental results, the optimal electrode geometry of the C4D sensor with radial configuration is discussed and proposed. The recommended electrode length is 5–10 times of the pipe inner diameter and the recommended electrode angle is 120–160°.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Electrode Geometry on the Performance of C4D Sensor with Radial Configuration

Huang

Jiang

et al. 2021

Sensors

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“…S 11 reaches the minimum value near the resonance frequency when Q s ≫ 1. 30 We prepared HCl solutions with different conductivities by changing the concentration, demonstrating the relevant pH value. When the device was placed in the HCl solution at pH = 1 and T = 25℃, the resonance frequency of the sensor centered at ~ 1.12 GHz, while the resonance frequency is ~ 1.85 GHz for the substrate only, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Self-sensing Intelligent Microrobots for Non-Invasive and Wireless Monitoring Systems

Zhao

Wang

et al. 2023

Preprint

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Microrobots present great potential and wide applications in in-situ treatment and attract tremendous attention due to their small size and flexible movement. However, functional modification for microrobots became more important for their interaction with the environment, except for precise motion control. Here, we design a novel artificial intelligence (AI) microrobot, which can respond to changes in the external environment without onboard energy supplying and transmit signals wirelessly in real time. The AI microrobot can cooperate with external electromagnetic imaging equipment and enhance the local radiofrequency (RF) magnetic field to achieve a large penetration sensing depth and a high spatial resolution. The working ranges are determined by the structure of the sensor circuit and the corresponding enhancement effect can be modulated by the conductivity and permittivity of the surrounding environment, reaching ~ 560 times at most. Under the control of an external magnetic field, the magnetic tail can actuate the microrobotic agent to move accurately, with great potential to realize in-situ monitoring in different places in a human body in an almost noninvasive fashion, especially around potential diseases, which is of great significance for early disease discovery and accurate diagnosis. In addition, the compatible fabrication process provides an approach to swarms of functional microrobots. The findings highlight the feasibility of the self-sensing AI microrobot for the development of in-situ diagnosis or even treatment according to the sensing signals.

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“…proposed an interdigital capacitor formed within a coil structure as shown in Figure a (left). [ 150 ] The interdigital capacitor leaks the electric field into the surrounding medium. Hence, when the permittivity of the medium changes, the resonant frequency shifts as shown in Figure 8a (right).…”

Section: Telemetrymentioning

confidence: 99%

Section: Telemetrymentioning

confidence: 99%

Wireless Power Transfer and Telemetry for Implantable Bioelectronics

Yoo

Lee

Joo

et al. 2021

Adv Healthcare Materials

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Implantable bioelectronic devices are becoming useful and prospective solutions for various diseases owing to their ability to monitor or manipulate body functions. However, conventional implantable devices (e.g., pacemaker and neurostimulator) are still bulky and rigid, which is mostly due to the energy storage component. In addition to mechanical mismatch between the bulky and rigid implantable device and the soft human tissue, another significant drawback is that the entire device should be surgically replaced once the initially stored energy is exhausted. Besides, retrieving physiological information across a closed epidermis is a tricky procedure. However, wireless interfaces for power and data transfer utilizing radio frequency (RF) microwave offer a promising solution for resolving such issues. While the RF interfacing devices for power and data transfer are extensively investigated and developed using conventional electronics, their application to implantable bioelectronics is still a challenge owing to the constraints and requirements of in vivo environments, such as mechanical softness, small module size, tissue attenuation, and biocompatibility. This work elucidates the recent advances in RF‐based power transfer and telemetry for implantable bioelectronics to tackle such challenges.

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A Flexible Wireless Dielectric Sensor for Noninvasive Fluid Monitoring

Cited by 12 publications

References 23 publications

Investigation of the Effects of Electrode Geometry on the Performance of C4D Sensor with Radial Configuration

Investigation of the Effects of Electrode Geometry on the Performance of C4D Sensor with Radial Configuration

Self-sensing Intelligent Microrobots for Non-Invasive and Wireless Monitoring Systems

Wireless Power Transfer and Telemetry for Implantable Bioelectronics

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