Drips detection sensor of cylindrical surface capacitor

Zhang, Wenzhao; Zhou, Wenzhen; Liu, Zhizhuang

doi:10.1109/iceceng.2011.6057536

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…The formula suggests that the length of the copper foil is not highly related to the detectable volume of the bubbles, but the width of the foil does affect sensitivity. Considering installation difficulties and potential errors, Capacitive sensors are already used in IV infusion to monitor fluid [23][24][25][26][27] or combined with PDMS membrane technology to monitor blood pressure, oxygen saturation, and heart rate [28][29][30][31]. Currently, such methods are used for flow rate and patient indication monitoring, while this study applies the method for bubble detection.…”

Section: Methodology Of Studiesmentioning

confidence: 99%

“…Figure 2 shows a cylindrical capacitor with two different dielectrics. The capacitance at the ends of the plates follows the given formula [23].…”

Section: Proposed Use Of Capacitive Sensors In Iot Medical Devicementioning

confidence: 99%

“…where V is the volume of the air bubble. Capacitive sensors are already used in IV infusion to monitor fluid [23][24][25][26][27] or combined with PDMS membrane technology to monitor blood pressure, oxygen saturation, and heart rate [28][29][30][31]. Currently, such methods are used for flow rate and patient indication monitoring, while this study applies the method for bubble detection.…”

Section: 𝑑𝐶 =mentioning

confidence: 99%

See 2 more Smart Citations

A Novel Low-Cost Capacitance Sensor Solution for Real-Time Bubble Monitoring in Medical Infusion Devices

Kok,

Dai,

Lee

et al. 2024

Electronics

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In the present day, IoT technology is widely applied in the field of medical devices to facilitate real-time monitoring and management by medical staff, thereby better-ensuring patient safety. In IoT intravenous infusion monitoring sensors, it is particularly important to ensure that air bubbles are not infused into the patient’s body. The most common method for bubble detection during intravenous infusions is the use of infrared or laser sensors, which can usually meet design requirements at a relatively low cost. Another method is the use of ultrasonic detection of bubbles, which achieves high accuracy but has not been widely promoted in the market due to higher costs. This proposed work introduces a new type of sensor that detects bubbles by monitoring changes in capacitance between two electrodes installed at the surface of the infusion pipe. If this sensor is deployed on the ESP32 platform, which is widely used in embedded IoT devices, it can achieve 35 μL bubble detection precision with an average power consumption of 5.18 mW and a mass production cost of $0.022. Although the precision of this sensor is significantly lower than the low-cost IR bubble sensor, it still satisfies the design requirement of the IV infusion IoT sensor.

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Section: Methodology Of Studiesmentioning

confidence: 99%

“…Figure 2 shows a cylindrical capacitor with two different dielectrics. The capacitance at the ends of the plates follows the given formula [23].…”

Section: Proposed Use Of Capacitive Sensors In Iot Medical Devicementioning

confidence: 99%

Section: 𝑑𝐶 =mentioning

confidence: 99%

See 1 more Smart Citation

A Novel Low-Cost Capacitance Sensor Solution for Real-Time Bubble Monitoring in Medical Infusion Devices

Kok,

Dai,

Lee

et al. 2024

Electronics

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“…To benchmark the proposed techniques, the calculated capacitances using the analytical and approximate methods are compared with the data available in the literature. In reference [14], the approximate equation used to calculate the capacitance is given by;…”

Section: Casementioning

confidence: 99%

“…It is applied to identify the phase-fractions of three-phase (gas-oil-brine) petroleum carrying pipeline with steady-state flow. This method can also be used as a drips detector sensor or to monitor the post-operative multi-phase fluid flow from human body [14].…”

Section: Introductionmentioning

confidence: 99%

Novel Solution for Multi-Phase Semi-Cylindrical Capacitive Sensors

et al. 2019

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An accurate theoretical formulation is presented for a semi-cylindrical parallel plate capacitor, independent of the electrode dimensions. An approximate solution is also presented to relate the changes in capacitance with changing volume-ratio of the multi-phase dielectric filling of the capacitor. Two applications are considered to verify the proposed techniques. In the first application, the calculated capacitance is compared with the measured capacitance of a healthy tree trunk to identify the initial stage of pest infestation. In the second application, an approximate capacitance of a three-phase mixture, consisting of gas, oil and brine layers, are used to identify the phase-fraction of a petroleum carrying pipeline with a steady-state flow. The advantage and limitations of the proposed approximate method are studied. In addition to logging and monitoring the oil supply, this simple method can electronically control multi-phase pipes with intravenous injections to collect postoperative fluids from the human body. INDEX TERMS Cylindrical-capacitor, multi-phase flow, dielectric sensor, material properties.

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Drips detection sensor of cylindrical surface capacitor

Cited by 2 publications

References 5 publications

A Novel Low-Cost Capacitance Sensor Solution for Real-Time Bubble Monitoring in Medical Infusion Devices

A Novel Low-Cost Capacitance Sensor Solution for Real-Time Bubble Monitoring in Medical Infusion Devices

Novel Solution for Multi-Phase Semi-Cylindrical Capacitive Sensors

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